SPD3000X Series ProgrammableLinear DC Power Supply
Service Manual
E01B

SPD3000X Service Manual ICopyright and Declaration
Copyright
SIGLENT TECHNOLOGIES CO.，LTD. All Right Reserved.

Trademark Information
SIGLENT is a registered trademark of SIGLENT TECHNOLOGIES.

Declaration⚫

SIGLENT products are protected by patent law in and outside of thePeople’s Republic of China.
⚫

SIGLENT reserved the right to modify or change the specifications andprice of the product⚫

Information in this publication replace all previous corresponding material⚫

Any copying, extracting or translation of the content of this manual is notallowed without permission from SIGLENT.
⚫

SIGLENT will not be responsible for losses caused by either incidental orconsequential in connection with the furnishing, use or performance of thismanual as well as any information contained.

II SPD3000X Service ManualGeneral Safety Summary
Please review the following safety precautions carefully to avoid personal
injury or damage to this product or any product connected to it. To prevent
potential danger, please use the instrument as specified.
Only qualified personnel should perform service procedures.

To Avoid Fire or Personal Injuries
Use Proper Power Cord. Use only the power cord specified for this productand approved by local state.
Avoid Electric Shock. To avoid injuries or losses of life, do not connect ordisconnect probes or test leads while they are connected to a voltage source.
Ground the Product. This product is grounded through the protective terra
conductor of the power line. To avoid electric shock, the grounding conductor
must be connected to the earth. Make sure the instrument is grounded
correctly before connecting its input or output terminals.
Connect the Probe Properly. Do not connect the probe ground lead to ahigh voltage since it has the isobaric electric potential as ground.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all
ratings and markers on the instrument and check your manual for more
information about ratings before connecting.
Use Proper Fuse. Use only the specified fuse.
Do Not Operate Without Covers. Do not operate this instrument with covers
or panels removed.
Avoid Circuit or Wire Exposed. Do not touch exposed junctions andcomponents when the unit is powered.
Do Not Operate With Suspected Failures. If you suspect damage occurs tothis instrument, have it inspected by qualified service personnel before
SPD3000X Service ManualIIIfurther operation. Any maintenance, adjustment or replacement especially tothe circuits or accessories should be performed by SIGLENT authorized
personnel.
Keep Product Surfaces Clean and Dry.
Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not
operate the instrument in wet or damp condition.
Do Not Operate in an Explosive Atmosphere. To avoid injuries or fire
hazards, do not operate in an explosive atmosphere.
ESD Protection. ESD can cause damage to the instrument and should betested in a static electricity area whenever possible. Before connecting thecable to the instrument, ground the inner and outer conductors briefly todischarge static electricity.

IV SPD3000X Service ManualSafety Terms and Symbols
Terms on the Product.
Terms may appear on the product:
DANGER: Indicates direct injury or hazard that may occur.

WARNING: Indicates potential injury or hazard that may occur.

CAUTION: Indicates potential damage to the instrument or other property that
may occur.

Symbols may appear on the product:

Hazardous
Hazardous
power

Protective
Earth Terminal

Warning

Earth

Power

GroundswitchSPD3000X Service ManualVContent
Copyright and Declaration ................................................................................. II
General Safety Summary.................................................................................. III
Safety Terms and Symbols ................................................................................ V
Chapter 1 General Features and Specifications ............................................. 1
General Features............................................................................................................ 1
Features and benefits .................................................................................................... 1
Specifications .................................................................................................................. 2
Prepare Information ....................................................................................................... 4
Power-on Inspection ...................................................................................................... 4
Interface test.................................................................................................................... 5

Chapter 2

Performance Verification ............................................................... 7

Testing report ................................................................................................................... 8
Verify power regulation rate ........................................................................................... 9
Verify load regulation rate ............................................................................................ 11
Verify output voltage accuracy ................................................................................... 13
Verify output current accuracy .................................................................................... 14
Verify CH3 channel output voltage ............................................................................ 16
Verify output ripple and noise ..................................................................................... 16
Verify the output voltage overshoot of on/off ............................................................ 18
Verify transient response recovery time..................................................................... 18
Verify short circuit protection ....................................................................................... 19
Verify overvoltage protection ....................................................................................... 20

Chapter 3

Disassembly and assembly ........................................................ 21

Safety prevention.......................................................................................................... 21
Module list...................................................................................................................... 21
Equipped with tools: ..................................................................................................... 22
Teardown steps:............................................................................................................ 22

Chapter 4

Hardware troubleshooting ........................................................... 33

ESD prevention............................................................................................................. 33
Required Equipments .................................................................................................. 34
Main Board Drawing .................................................................................................... 34
Power Board Drawing .................................................................................................. 35
Troubleshooting flowchart ............................................................................................ 36
Check the power supply............................................................................................... 37
Check the main board .................................................................................................. 38
Check the power board ................................................................................................ 39
Quick Guide for General Failures .............................................................................. 40

Chapter 5 Service and Support ..................................................................... 41
Maintain summary ........................................................................................................ 41
Repackaging for Shipment .......................................................................................... 41

Contact SIGLENT............................................................................................... 42
VI SPD3000X Service ManualChapter 1 GeneralSpecifications

FeaturesandGeneral Features
The SPD3000 Series Programmable Linear DC Power Supply is equipped with
a 4.3-inch TFT-LCD or LED display with programmable and real-time waveform
display for a new experience. It has three independent outputs: two sets ofadjustable voltage values and a fixed set of voltage values of 2.5V, 3.3V and
5V, with output short-circuit and overload protection for use in different types of
production and research.

Features and benefits⚫

Three-way high-precision programmable output: 32V/3.2A×2，Switchable
2.5V/3.3V/5V/3.2A×1, total power 220W⚫

Compact, easy to use, powerful, ideal for bench power supply⚫

Stable, Reliable and Low Noise: ≤ 1mVrms⚫

Fast Transient Response Time: < 50us⚫

Minimum resolution of 1mV, 1mA with 5-bit voltage and 4-bit current
display.

⚫

Timer function sequences output values⚫

4.3-inch LED or TFT-LCD display with 480 * 272 high resolution⚫ Three output modes: independent, series and parallel connection⚫

Four kinds of input/line voltage values includes 100V, 110V, 220V and
230V to satisfy different requirements⚫

Intelligent temperature controlled fan, effectively reduces noise
SPD3000X Service Manual 1⚫

Clear graphical interface, with waveform display⚫

5 internal system parameters save / recall, support for data storage space
expansion⚫

Provide EasyPower PC software, real-time control via USB, LAN, support
SCPI command set and LabView driver package to meet the remotecontrol and communication requirement

Specifications
To verify that the power supply meets the specifications, the power supply
must have been operating continuously for 30 minutes within the specified
operating temperature range. The specific technical specifications are subject
to the actual model.

Model

SPD3303X-E

SPD3303X

CH1output voltage：0~32V，output current：0~3.2A
Chanel output

CH2 output voltage：0~32V，current：0~3.2A
CH3 output voltage:2.5V/3.3V/5.0V, current：3.2A

Display
Resolution

voltagemode

voltage, 4-bit current display

10mV/10mA

1mV/1mA

voltage±（0.5%of reading+2digits） voltage±（0.03%of reading+10mV）
current±（0.5%of reading+2digits） current±（0.3%of reading+10mA）
regulation≤0.01%+3mV

regulation≤0.01%+3mV

rate
Load
rate
Ripple and noise≤1mVrms（5Hz~1MHz）

Recovery Time

<50us(Load change 50%, minimum load 0.5A)

Power≤0.2%+3mA

Constant

rate

current

Line

mode

rate

Parallelvoltage, 3-bit current display

current±（0.5%of reading+2digits） current±（0.3%of reading+10mA）

Readback accuracy

Constant

4.3-inch true color TFT-LCD 5-bit

voltage±（0.5%of reading+2digits） voltage±（0.03%of reading+10mV）

Setting accuracyPower

4.3-inch true color TFT-LCD 4-bit

regulation
regulation≤0.2%+3mA

Ripple and noise≤3mArmsPower≤0.01%+3mV

regulation

2 SPD3000X Service Manual

mode

rate
Load

regulation≤0.01%+3mV

regulation≤0.01%+5mV

regulation≤300mVrate
Power
Series

rate

mode

Load
rate

CH3

Output voltage（2.5/3.3/5V）±8%

Linearregulation≤0.01%+3mV

regulation≤0.01%+3mV

rate
Load
rate
Ripple and noise≤1mVrms（5Hz~1MHz）

Lock key

YES

Save/call

5 setsMaximum output power

220W

Input power

AC100V/120V/220V/230V±10% 50/60Hz

Standard interface

USB Device、LAN

Insulation

Base to terminal≥20MΩ （DC500V）
Base to AC line≥30MΩ （DC500V）
Outdoor use:

Operating environment

Elevation≤2000m

Environment

temperature

0~40°C

Relative

humidity≤80%
Installation level：II

Pollution level：2

Storage environment

Environment temperature：-10~70°C

Dimension

225（W）×143（H）×278（D）mm

WeightAbout 8.0kg

Relative humidity≤80%

SPD3000X Service Manual3Prepare Information
Before doing performance verifying, you should master the following
operations to make the power work in a good state or deal with some simple
functional problems. The following contents are included in this chapter:⚫
⚫

How to perform functional checks
How to test the interface working properly

For more detailed information about Power operation, please refer to the
Quick Guide for Power.

Power-on Inspection
Verify that the power supply is working by performing a power-on check.
The SPD3000X series has a supply voltage of 100VACRMS to
240VACRMS.Before connect the instrument to a power source, please selectthe AC voltage selector on the rear panel of your power according to the power
supply. Then connect the power line to the socket on the rear panel of themultimeter.
Note: to avoid electric shock, make sure that the instrument is correctly
grounded to the earth before connecting AC power.

power jackFigure 1-1 connect the power cord
4 SPD3000X Service ManualInterface test
The SPD3000X series power supply supports two standard interfaces: USB
Device and LAN interface. Through these interfaces, the power supply
communicates with the outside world and implements some higher-level
functions. To ensure that the power supply is working properly, perform thefollowing interface tests.

USB Device test
Use EasyPower of the host computer software to test whether the USB
Device interface is working properly.
Tools:⚫

One SPD3000X series power supply;⚫

One PC with USB interface;⚫

Standard USB cable (AB type);⚫

PC software EasyPower;step：
1. Install the EasyPower on the PC and follow the prompts to install the driver.
2. Connect the power supply to the PC with a USB cable.

usb jack

Figure 1-2

USB Device interface
SPD3000X Service Manual53. Run the EasyPower software. Double-click to open the software interface,click “Function” in the upper left corner of the interface, then the “control”
drop-down option will pop up, click “control”, then the “Connect Type”
window will pop up, continue to click the “USBTMC” option on the window,
and pop up the information of the connected power device, click “Open” tocomplete the connection.

LAN test
Use EasyPower of the host computer software to test whether the LANinterface is working properly.
Tools:⚫

One SPD3000X series power supply⚫

One PC with a network cable interface⚫

One standard network cable⚫

EasyPower of the PC software

Step：
1. Install the EasyPower on the PC and follow the prompts to install the driver.
2. Connect the power supply to the PC with a network cable.

LAN jack

Figure 1-3 LAN interface
3. Run the EasyPower software. Double-click to open the software interface,
6 SPD3000X Service Manualclick the “Function” in the upper left corner of the interface, the “control”
drop-down option will pop up, click “control”, the“ ConnectType” window will
pop up, continue to click the “VXI11” option on the window, and then input
the setted power supply IP address in the pop-up window, click “OK” tocomplete the connection. (See the user manual or quick guide for IP address
settings)

Chapter 2

Performance Verification

This chapter mainly describes how to test and verify whether the relevant
indicators of the verification power supply meet the specifications. To ensure
the accuracy of the measurements, preheat all instruments for 30 minutes.
Here are the equipment needed to perform the test:
Table 2-1 equipment required for test:
description

specification

exampleDigital multimeter6-digit half precision

SDM3065X

Electronic load

Voltage and current power isgreater than the power supply

SDL1020X

parameters
Connection cable

Power supply cable

Adjustable transformer

80V-240V voltage adjustable

Oscilloscope

200MHz brandwidth

Switching power supply

Output DC voltage exceed
40V

SDS1202X-E

The following is a schematic diagram of the connection between the electronicload and the power supply under test:

Figure 2-1

Connect the test equipment
SPD3000X Service Manual7

Testing report
In order to verify that the test results meet the specifications,please record the test data in the test report in time.

8 SPD3000X Service Manual

Verify power regulation rate（1）Constant voltage mode
Test Overview: The input voltage regulation rate is also called the line regulation rate,that is, the change of the input voltage will cause the output voltage to fluctuate.
Under the input voltage changes across the full input range, test the percentage of theoutput voltage that deviates from the setting output voltage. This test verifies thepower regulation of the power supply in constant voltage mode.
Formula: power regulation rate =

∆𝑽𝒐
𝑽𝒔𝒆𝒕

（1）

∗ 𝟏𝟎𝟎%

Specifications: 0.01% + 3mV
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter, electronic load
Test methods and steps:(a) The input of the SPD3000X is powered by a variable transformer, theoutput terminal connect to the electronic load, and the multimeter meter pen
connect to the positive and negative terminals of the power output terminal.
(b) Turn on the power of each device, set the output to 100VAC of thetransformer. The SPD3000X works in constant voltage mode after power-on,
the electronic load set to constant current mode, and the multimeter set to
DCV gear.
(c) The output of SPD3000X set to 2V/3.2A. At this time, the electronic load is
set to 3.198A, and record the reading value of the multimeter.
(d) SPD3000X set to 5V/3.2A, 8V/3.2A, 11V/3.2A, 14V/3.2A, 17V/3.2A,
20V/3.2A, 23V/3.2A, 26V/3.2A, 29V/3.2. A, 32V/3.2A, the electronic load set
to 3.198A, and record the reading value of the multimeter in each case.
(e) Then set the outputs of the adjustable transformers to 110VAC, 120VAC,
200V, 220V, 230V, 240V, repeat steps (c) and (d).
(Note: the SPD3000X's rear case input power should be switched to thecorresponding position, otherwise the fuse will burn out)(f) Calculate the corresponding power regulation rate by the formula (1). Take
the maximum value in the calculation result to determine whether the
SPD3000X has reached the predetermined specification.
Table 2-2
Vo
Vin

2 5
V V

8
V

11
V

14
V

17
V

20
V

23
V

26
V

29
V

32
V

regulation rate

100V
110V
120V
SPD3000X Service Manual

9

200V
220V
230V
240V

2）Constant current mode
Test Overview: When the power supply is working in constant current mode,the change of input voltage will cause fluctuations to the output current. Under
the input voltage changes across the full input range, test the percentage of theoutput current that deviates from the setting output current.
∆𝐼𝑜
Formula: power regulation rate=∗ 100%（2）
𝐼𝑠𝑒𝑡
Specifications: 0.2% + 3mA
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter, electronic load
Test methods and steps:(a)The input of the SPD3000X is powered by a variable transformer, turn on
the power of each device, the electronic load set to constant current mode,the multimeter set to the 10A range of the DCI gear, and the multimeter pen
connect to the electronic load in series.
(b)Set the output to 100VAC of the transformer, the output of SPD3000X set
to 1A/32V, the electronic load set to 31V, the SPD3000X works in constantcurrent mode after power-on, and record the reading value of the multimeter.
(c) SPD3000X set to 2A/32V、3.2A/32V, and record the reading value of themultimeter in each case.
(d) Then set the outputs of the adjustable transformers to 110VAC, 120VAC,
200V, 220V, 230V, 240V, repeat steps (b) and (c).
(Note: the SPD3000X's rear case input power should be switched to thecorresponding position, otherwise the fuse will burn out)(e) Calculate the corresponding power regulation rate by the formula (2). Take
the maximum value in the calculation result to determine whether the
SPD3000X has reached the predetermined specification.
Table 2-3
Vo

1A

Vin
100V
110V
120V
10 SPD3000X Service Manual

2A

3.2A

regulation rate

200V
220V
230V
240V

Verify load regulation rate（1）Constant voltage mode
Test Overview: In the case of rated input voltage, change the output load
within the full load range and test the percentage of the output voltage
relative to the set value at this time. It reflect the ability of the circuit tomaintain a predetermined output voltage when change the load.
∆𝑉𝑜
Formula: load regulation rate =∗ 100%（3）
𝑉𝑠𝑒𝑡
Specifications: 0.01% + 3mV
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter, electronic load
Test methods and steps:(a) The input of the SPD3000X is set to 220V by the variable transformer, theoutput terminal connect to the electronic load, and the multimeter meter pen
connect to the positive and negative terminals of the power output terminal inparallel.
(b) Turn on the power of each device, the electronic load set to constantcurrent mode, and the multimeter set to DCV gear.
(c) The output of SPD3000X set to 1V/3.2A. Turn on the output and note thereading of the multimeter when the SPD3000X is without loading.
(d)Set the current of the electronic load to 1A、2A、3A, and record thereading value of the multimeter in each case. (Note: the connection point
between the multimeter and the power supply should be fixed, otherwise it willaffect the results of the test)(e) Then set the SPD3000X to 5V/3.2A, 9V/3.2A, 13V/3.2A, 17V/3.2A,
21V/3.2A, 25V/3.2A, 29V/3.2A, 32V/3.2A, in each setting, repeat step (d)separately.
(f) Calculate the corresponding load regulation rate by the formula (3). Take
the maximum value in the calculation result to determine whether the
SPD3000X has reached the predetermined specification.
SPD3000X Service Manual11Table 2-4
Io

0A

1A

2A

3.2A

regulation rate

Vo
1V
5V
9V
13V
17V
21V
25V
29V
32V

（2）Constant current mode
Test Overview: In the case of rated input voltage, change the output load
within the full load range and test the percentage of the output current
relative to the set value at this time. It reflect the ability of the circuit tomaintain a predetermined output current when change the load.
∆𝐼𝑜
Formula: load regulation rate =∗ 100%（4）
𝐼𝑠𝑒𝑡
Specifications: 0.2% + 3mA
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter, electronic load
Test methods and steps:(a) The input of the SPD3000X is set to 220V by the variable transformer,
after turn on the power of each device, the electronic load set to constantvoltage mode, the multimeter set to the 10A range of the DCI gear, and themultimeter pen connect to the electronic load in series.
(b) The output of SPD3000X set to 1A/32V, turn on the output, and theelectronic load set to 31V，record the current reading value of the multimeterat this time.
(c) Set the voltage of the electronic load to 1V, 5V, 9V, 13V, 17V, 21V, 25V
and 29V in turn, and record the reading value of the multimeter in eachsetting. (Considering that when the connected wire between the electronicload and the SPD3000X have current flows, the voltage have wire loss, so thevoltage of the electronic load should be adjusted according to the actual wireloss to make the SPD3000X works in the constant current mode)
12 SPD3000X Service Manual(d) Set the SPD3000X to 2A/32V、3.2A/32V, in each setting, repeat step(b)、（c）separately.
(f) Calculate the corresponding load regulation rate by the formula (4). Take
the maximum value in the calculation result to determine whether the
SPD3000X has reached the predetermined specification.
Table 2-5
Vo
Io

1 5
V V

9
V

13
V

17
V

21
V

25
V

29
V

32
V

regulation rate1A
2A
3.2A

Verify output voltage accuracy
Test overview: In the two-wire or four-wire mode, under the rated input
voltage, test the actual output voltage and readback voltage value relative tothe set voltage; reflect the voltage accuracy of the power supply.
∆𝑉𝑜
Formula: Setting voltage accuracy =∗ 100%（5）
𝑉𝑠𝑒𝑡∆𝑉𝑏𝑎𝑐𝑘Formula: Readback voltage accuracy =∗ 100%（6）
𝑉𝑠𝑒𝑡
Specifications: 0.03% + 10mV
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter
Test methods and steps:(a) The input of the SPD3000X is set to 220V by the variable transformer, theoutput terminal connect to the electronic load, and the multimeter meter pen
connect to the positive and negative terminals of the power output terminal inparallel.
(b) Turn on the power of each device and set the multimeter to the auto rangeof the DCV gear.
(c) The output of SPD3000X set to 32V/0.1A. Turn on the output and note thereading of the multimeter and the voltage readback value of the power when
the SPD3000X is without loading.
(d) Set the SPD3000X to 28V/0.1A, 22V/0.1A, 15V/0.1A, 10V/0.1A, 1V/0.1A,
0.1V/0.1A, 0.01V/0.1A, 0V/0.1A, In each setting, repeat step (c)separately.
(e) Calculate the corresponding setting voltage accuracy by the formula (5)and the readback voltage accuracy by the formula（6）. Take the maximum
SPD3000X Service Manual13value in the calculation result to determine whether the SPD3000X hasreached the predetermined specification.
Table 2-6Mode

2 wire4 wireSet Volt (V)Measured Volt (V)Readback(V)

Volt

Pass /
Fail

32V
28V
22V
15V
10V
1V
0.1V
0.01V
0V
32V
28V
22V
15V
10V
1V
0.1V
0.01V
0V

Verify output current accuracy
Test overview: under the rated input voltage, test the actual output current
and readback current value relative to the set voltage; reflect the current
accuracy of the power supply.
∆𝐼𝑜
Formula: Setting current accuracy =∗ 100%（7）
𝐼𝑠𝑒𝑡∆𝐼𝑏𝑎𝑐𝑘Formula: Readback current accuracy =∗ 100%（8）
𝐼𝑠𝑒𝑡
Specifications: 0.3% + 10mA
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter, electronic load
Test methods and steps:(a) The input of the SPD3000X is set to 220V by the variable transformer,
14 SPD3000X Service Manualturn on the power of each device, set the electronic load to constant voltage
mode, the multimeter set to the 10A range of the DCI gear, and the multimeter
pen connect to the electronic load in series.
(b) Set the SPD3000X to 0A/32V, turn on the output, and set the electronicload to 31V.record the reading of the multimeter and the current readback
value of the power.
(c) Set the SPD3000X to 0.01A/32V，0.1A/32V，1A/32V，2A/32V，
3.2A/32V, in each setting, repeat step (b)separately.
(d) Calculate the corresponding setting current accuracy by the formula (7)and the readback current accuracy by the formula（8）. Take themaximum value in the calculation result to determine whether the
SPD3000X has reached the predetermined specification.
Table 2-7
channel Set Curr (A)1

2

Measured Curr(A)

Readback(A)

Curr

Pass /
Fail

0A
0.01A
0.1A
1A
2A
3.2A
0A
0.01A
0.1A
1A
2A
3.2A

SPD3000X Service Manual

15Verify CH3 channel output voltage
Test overview: In the case of rated input voltage, select the required 2.5V,
3.3V, 5V output voltage by dialing the CH3 dial switch, and then test theactual output voltage value of CH3 channel.
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter
Test methods and steps:(a)The input of the SPD3000X is set to 220V by the variable transformer,
the multimeter pen connect to the positive and negative terminals of the CH3
output terminal in parallel.
(b) Turn on the power of each device and set the multimeter to the auto rangeof the DCV gear.
(c) Toggle the CH3 dial switch of the SPD3000X to the 2.5V position, turn on
the output, and record the reading of the multimeter when the SPD3000X is
without loading.
(d) Then push the CH3 DIP switch of the SPD3000X to the 3.3V position andthe 5V position. Repeat step (c) for each setting.
(e) The CH3 output voltage error range is within 8% to determine whether the
SPD3000X has reached the predetermined specification.

Verify output ripple and noise
Test overview:
Ripple: The ripple is the AC component superimposed on the output of DC
voltage; The ripple voltage is the peak-to-peak value between the peaks andvalleys of the fingerprint wave; during each on and off process, the electricenergy is extracted from the input terminal to the output terminal to form aprocess of charging and discharging, thereby causing fluctuations in the
output voltage.
noise:(1) Noise voltage refers to its peak-to-peak value, in switching power
supplies, there are two main reasons for formation:(a) A high-frequency pulse train generated by the switching power
supply itself, which is caused by a sharp pulse generated when theswitch is turned on and off.
(b) Interference from external electromagnetic fields, entering theswitching power supply through radiation or entering the switching
16 SPD3000X Service Manualpower supply through the power line;(2) In the linear power supply, the noise is mainly related to the loop
stability of the system. In addition, the switching power supply moduleon the main board and the signal line layout of the display screen may
also cause radiation interference.
Specifications: 1mVrms
Preset conditions: room temperature
Test instrument: oscilloscope, common probe (with 1:10 probe),
electronic load
Test environment: 220V power supply, SPD3000X set output
to 32V/3.2A, full load output, electronic load set to 3.198A in constantcurrent mode.
Test methods and steps:(a). The probe is grounded in the shortest grounding manner. It is
recommended to use a grounding spring. In addition, in the
SPD3000X output terminal, that is, a 10uF electrolytic capacitor
should be connected in parallel with the test point of the probe to
reduce the electronic load which can conduct the noise through theconnecting line and radiated noise(b). The oscilloscope turn on the bandwidth limit of 20MHz, set theappropriate time base and storage depth to ensure the sampling rate
is 100M/s, set the probe amplification factor to 1:1, the coupling modeis AC coupling, turn on the statistical function, and record the valid
value, peak-to-peak value, maximum value, and minimum value, thensave them as screenshots.
Other instructions: In order to get more accurate results, grounding
should be tested with reference to the following methods.

Figure2- 2 Grounding method

SPD3000X Service Manual17Verify the output voltage overshoot of on/off
Test overview:
Output overshoot: The output voltage of the power supply will generate
voltage overshoot at the moment of switching. This is mainly related toloop feedback stability. The linear power supply is used as a laboratory
power supply equipment, so it should not have overshoot strictly.
Test instrument: oscilloscope, ordinary probe
Specifications: no overshootPreset conditions: room temperature
Test environment: 220V power supply, the probe is grounded in the shortest
way.
Test methods and steps:(a). Set the oscilloscope in single trigger, select the appropriate
trigger level, and use the oscilloscope's measurement
function.
(b) When the power input is turned on or off, test the voltage
waveform of the output of the power supply under no-loading
and full-loading conditions.

Verify transient response recovery time
Test overview:
The transient response of the regulated power supply can be divided into
source transient response and load transient response, and the recovery timeis generally used to predict the quality of the transient response. The transient
voltage characteristic is an inherent characteristic of the power supply itself.
There are many energy storage components inside the power supply. The
voltage adjustment needs to read back from the output, compare thestandard voltage, and adjust the switching duty cycle. Increasing the speed of
the control loop provides shorter transient response times. However, it is
18 SPD3000X Service Manualpossible that the output is very unstable and even oscillates. If the voltage
transient response capability is poor, the voltage drop/overshoot time is toolong and the amplitude is too large, which directly causes many problems.
This will make the measurement not work properly. Therefore, if you havesuch an application, you must consider a power supply that is more
responsive.
Specifications: When the output current is from full load to half load, or fromhalf load to full load, the output voltage is restored to within 15mV for lessthan 50μs.
Test instrument: SDS1202X-E, common probe, electronic load
Preset conditions: room temperature
Test environment: 220V power supply, the probe is grounded in the shortest
way.
Test methods and steps:(a). Turn on the power of the instrument, set the oscilloscope to AC coupling,
DC trigger mode, select the appropriate trigger level, and the probe test pointis the positive and negative terminals of the output of the power supply;(b). The SPD3000X power supply connect to the electronic load, and theelectronic load set to the dynamic test mode. The relevant settings are as
follows: set to continuous mode, set the rising and falling slopes to10A/us,
level A=1.598A, level B=3.198A, set the frequency to 50Hz, and thescreenshot retains the test result;

Verify short circuit protection
Test overview:
When the output is shorted, the power supply works normally and thereadback current value is equal to the set current value. When the short circuit
is removed, the power supply can resume normal output.
Test instrument: SPD3000X
Preset conditions: room temperature
Test methods and steps:(a) Connect the device, pay attention to that after short the output of
the main circuit artificially, then turn on the output, because after the
SPD3000X Service Manual19output is turned on, if the set current value is relatively large, thesudden short-circuit will cause a very large spark, and there is asafety hazard; (Please set the current value to do the experiment incomparison)(b). Observe whether the readback value of the power supply is equal
to the set value, and whether the state before the short circuit isrestored after the short circuit is removed.
Other instructions: If the power supply does not return to normal after
removing the short circuit, it meets the design requirements.

Verify overvoltage protection
Test overview: SPD3000X power supply with overvoltage protection circuit,when the output exceeds 38V (±1V), trigger the thyristor to turn on to shortthe output circuit, and then control the mos tube through the overvoltage
protection loop to make the short circuit current to 0.5A. After the shortcircuit, the output needs to be turned off, and then it will work normally after
being turned back on.
Test instrument: switching power supply
Preset conditions: none
Test environment: room temperature
Test methods and steps:(a) Connect the SPD3000X power output to the switching power
supply;(b) Turn on the power of the instrument, set the output voltage of theswitching power supply near 38V, and then increase the output
voltage of the switching power supply gradually. When theovervoltage point is reached, the SPD3000X power supply output
is short-circuited.

20 SPD3000X Service ManualChapter 3

Disassembly and assemblyThis chapter mainly describes how to unassemble and assemble the module
units of the SPD3000X series power supply. Please refer to the given procedure
to remove or replace the corresponding power unit.
The following are the main contents of this chapter:⚫ Safety considerations include safety factors to be considered when
performing disassembly operations⚫ Module unit contains all detachable modular units of the power supply⚫ Preparation tool Contains the tools to be used during the disassembly
process⚫ Removal procedure Contains specific removal steps

Safety prevention
Only professional technicians can perform this disassembly step. Be sure to
disconnect all the power connections before operation, otherwise damage tothe instrument components or personal injury may result.

Avoiding electric shocks
Because there is a dangerous voltage in the power module, be sure to
disconnect the power supply before disassembling and wait for about threeminutes until the internal capacitor of the power supply is discharged.

ESD Prevention
Electrostatic discharge (ESD) can cause damage to the electronics inside thepower supply. Therefore, please use anti-static measures appropriately during
the disassembly process. It is best to place the power supply on an antistatic
mat and wear antistatic gloves.

Module list
All the module units of the power supply are listed in the order of disassembly
as follows:
Table 3-1 list of power modules
Module serial number

Module name1

handle components

2

the metal plate3

the handle support bone4

the front shell component
SPD3000X Service Manual21

5

the hardware components

6back hardware components

7

hardware main component

Equipped with tools:
1. Anti-static gloves;
2. The multifunctional screwdriver or electric group;
3. The screwdriver or long nose pliers.

Teardown steps:
This chapter mainly introduces how to remove and install the power of each
module unit, please follow the steps given in below the right operation.

Step 1: open handle components
Remove the 2 PCS KM4 * 16 screw, and remove the handle fixed tablet (2PCS) and the handle.

22 SPD3000X Service Manualhandlehandle fixed tablet

Figure 3-1

open handle components

SPD3000X Service Manual23

Step 2: remove the metal plate
Take 6 PCS PM3 * 6 on either side of the screw, and the metal cover plate toremove:Metal cover plate

Figure 3-2

24 SPD3000X Service Manual

remove the metal plateStep 3: open the handle support bone
Removed as shown in the figure below 4 PCS PM3 * 6 screws, and remove
the arrow direction support bone referring to the following figure.
support bone

Figure 3-3

open the handle support bone

SPD3000X Service Manual25Step 4: apart the front shell component and the hardware
components
Remove between the front shell components and hardware backplane 4 PCS
PM3 * 6 screws and the corresponding cable, remove the shell front
component and the power button.

Back hardware component

Front shell component

RRR

Hardware main component
Figure 3-4

26 SPD3000X Service Manual

Power button

apart the front shell component

Step 5: open the front shell components
Remove the 4 PCS PM3 * 6 screws on the main control board, 7 PCS M4 * 10
combination screw, screen ribbon cable, can remove the main control board,
wave button cap and 7 PCS terminal; Remove the metal front panel with plastic
shell before 4 PCS PC3 * 8 screw, can remove the metal front panel;

Main control board

Knob

Wave button cap

Terminal

Figure 3-5

open the front shell component

SPD3000X Service Manual27

Metal front panel

Figure 3-6

28 SPD3000X Service Manual

open the front shell component

Keyboard plate

Figure 3-7

open the front shell component

SPD3000X Service Manual29Step 6: open hardware components
Remove between back hardware shell and metal plate 4 PCS PM3 * 6 screws
and the corresponding cable, can remove the hardware shell components

Back hardware component
Hardware main component

Figure 3-8

30 SPD3000X Service Manual

open hardware component

Step 7: open back hardware components
Take 6 PCS PM3 *6 screw, can remove the power AC switch board and a
USB plate, remove the 4 PCS PM4 * 30 screw, desirable under a fan

USB platePower sea

Power AC switch board

Figure 3-9

Fanopen back hardware component

SPD3000X Service Manual31

Step 8: open hardware main component
Take 6 PCS PWM3 * 8 screws, 4 PCS PM3 * 6 screws, and remove thecorresponding lines, can remove the small power board and power switch
board, remove the 4 PCS TM5 * 10 screws, 4 PCS PWM3 * 8 screws under
the desirable transformer and floor mats.
Transformer

Power board

Power switch board

Figure 3-10

open hardware main component

Host assembly according to the above instead step!
32 SPD3000X Service ManualChapter 4

Hardware troubleshootingThis chapter describes how to handle common hardware failuresencountered during power operation. Before handling such fault, ensure thatthe power supply meets the following prerequisites.
1. If one voltage value is found to be different from the nominal value
when measuring voltage, turn off the power immediately.
2. Turn off the power before unpacking the connecting wire of the
mainboard and the screen backlight.
3. During the process of taking apart the instrument for measurement,take measures to prevent static electricity from damaging the internal
components.

ESD prevention
While performing any internal test of the power supply, please refer to thefollowing precautions to avoid damages to its internal modules or components
result from ESD.
⚫
Touch circuit boards by the edges as possible as you can.
⚫

Reduce handling of static-sensitive modules when necessary. .

⚫

Wear a grounded antistatic wrist strap to insulate the static voltage
from your body while touching these modules.

⚫

Operate static-sensitive modules only at static-free areas. Avoid
handling modules in areas that allow anything capable of generating or
holding a static charge.

SPD3000X Service Manual33

Required Equipments
The equipments listed in the table are required to troubleshoot the power.
Table 4-1 required equipments
equipment
specification
exampleDigital Multimeter Accuracy ±0.05%
Siglent SDM3065X
Oscilloscope

1 mV resolution
200MHz Bandwidth

Siglent SDS1202X-E

Main Board Drawing
Main board is used to control and manage the whole internal system of thepower. Please refer to the following drawing to quickly locate the test points on
the main board for easy resolution of the failures you encounter.

Figure 4-1

34 SPD3000X Service Manualmain board drawing

Power Board Drawing
Power board is used to provide various input voltages for the internal device
and output voltage to the users. Please refer to the following drawing to quickly
locate the test points on the main board for easy resolution of the failures you
encounter.

Figure 4-2

power board drawing

SPD3000X Service Manual

35Troubleshooting flowchart
The following is a flow chart of the power hardware failure. The following figure
can help you quickly locate and handle related hardware failures.

Figure 4-3 Troubleshooting flowchart

36 SPD3000X Service ManualCheck the power supply
Make sure that the power supply is properly grounded through the protective
grounding end of the power cord. Be careful not to touch or disassemble thepower board to avoid electric shock or burns. Please check the power supply
as follows:
1. Disconnect the power cord, pry the groove out of the power socket, remove
the fuse, and check if the fuse is burnt. If it burn out, please replace it in time.
2. After checking the fuse, reconnect the power cord and check if thetransformer output voltage is normal.
3. View the voltage of the transformer output terminal on the power board.
There are 2 groups of black, brown, red and orange 4Pin cables, 1 group ofyellow and yellow 2Pin cables, 2 groups of blue, white and blue 3Pin cables,and 1 group of gray and gray 2Pin cables. 1 group of blue 2Pin cable, 1 groupof brown-brown 2Pin cable, 1 group of orange-orange 2Pin cable, use thedigital multimeter of AC voltage gear to check whether the voltage output of
the transformer is normal. The voltage parameters are as follows:
Table 4-2: Power supply voltage parameter table
Voltage
Pin
0V
black
6.9V
brown
20.4V
red
33.6V
orangeError limit
no
±5%
±5%
±5%

Voltage
10.8V

Pin
yellow to yellow

Error limit±5%

Voltage
18.8V-0V-18.8V

Pin
blue to white to blue

Error limit±5%

Voltage
18.6V

Pin
gray to gray

Error limit±5%

Voltage
18.6V

Pin
blue to blue

Error limit±5%

Voltage

Pin

Error limit
SPD3000X Service Manual

37

7.4V

brown to brown±5%

Voltage
Pin
Error limit±5%
8.9V
orange to orange
If the measured voltage value is consistent with the corresponding parameterin the table, use the oscilloscope to check the ripple of the voltage. If the ripple
is small, the transformer is working properly;
If the measured voltage value does not match the corresponding parameter inthe table, proceed to the next step.
4. Disconnect the transformer from the power board and measure the output
voltage of the transformer again according to the data in the above table. If themeasured voltage value is consistent with the corresponding parameter in thetable, it indicates that the power board is faulty, resulting in abnormaltransformer output voltage, and further testing or replacing the power board;
If the measured voltage value does not match the corresponding
parameter in the table, it indicates that the transformer is faulty and needs toreplace a new transformer. To ensure safety, do not disassemble thetransformer and power board unauthorizedly.

Check the main board
After determining the normal output voltage of the transformer, remove thewhole main board to a position that is suitable for measuring the voltage of thedevice, keep the connection, plug in the input power line, turn on the powerswitch, and use the digital multimeter of DC voltage gear to check whether thevoltage of each test point is noraml.
The voltage parameters are shown in the following table:
Table 4-3: Voltage parameters on the main board
Test point
name
Test pin
Voltage value
（V）
TP1
UB1
6
2.5
TP2
UA2
6
2.5
TP3
L6
2
6
TP4
UB9
7
15
TP5
JC1
1
15
TP6
UA2
2
15
TP7
JB1
6
-15
TP8
UC1
3
-15
TP9
JA1
1
-15
TP10
U2
4
3.3
TP11
DB2
negative
5.0
38 SPD3000X Service ManualErrorlimit(V)
±0.2
±0.2
±0.4
±1
±1
±1
±1
±1
±1
±0.2
±0.3

electrode
TP0
RT91
GND
0
no
If the measured voltage does not match the corresponding parameters in theabove table, turn off the power immediately and cut off the power input toprevent some chips from being damaged due to improper operation. Then you
need to replace a new main board;
If the measured voltage value exactly matches the corresponding parameterin the above table, please proceed to the next step.

Check the power board
After confirming that the transformer output voltage is normal, plug in the input
power cord, turn on the power switch, and use the digital multimeter of DC
voltage gear to check whether the voltage at each test point is normal. To
ensure safety, do not disassemble the power board unauthorizedly.
The voltage parameters are shown in the following table:
TP1 takes TP3 as the reference ground, TP2 takes TP4 as the reference
ground.
Table 4-4: Voltage parameters on the power board
Test point

name

Test pin

Voltage value（V） Error limit(V)

TP1

J203

3

15

±1

TP1

J203

1

-15

±1

TP3

J202

2

GND1

TP2

J103

3

15

±1

TP2

J103

1

-15

±1

TP4

J102

2

GND2

SPD3000X Service Manual39Quick Guide for General Failures
The general hardware failures are described in the following. Reading thefollowing information can help you quickly handle some easy hardware failureswith more convenience.
1. No start-up after pressing the Power button:(1) Check if the power cord is correctly connected.
(2) Check if the power button is usable.
(3) Check whether the fuse has been burned out. If the fuse is burnt out
please replace with a fuse of the same rating.
(4) Check the connection between the power supply and the main board.
(5) If the instrument still does not work normally, please contact SIGLENT.
2. The instrument starts up with a dark screen:(1) Check the connection between the screen backlight circuit board andthe mainboard.
(2) If the instrument still does not work normally, please contact SIGLENT.
3. No response after pressing any button or abnormal display of thescreen:(1) Check the connection between the Screen backlight circuit board andthe mainboard.
(2) If the instrument still does not work normally, please contact SIGLENT.
4. Constant voltage output is not normal(1)Check if the output power of the power supply is satisfied.
(2) Check if there is a short circuit between the load and the power supply or
contacted poorly.
(3) Check if the current setting value is low.
5. Constant current output is not normal(1)Check if the output power of the power supply is satisfied.
(2)Check if the load and the power supply are open or connected poorly.
(3) Check if the voltage setting is low.

40 SPD3000X Service ManualChapter 5 Service and Support
Maintain summary
SIGLENT warrants that the products it manufactures and sells are free fromdefects in materials and workmanship for a period of three years from the dateof shipment from an authorized SIGLENT distributor. If a product provesdefective within the respective period, SIGLENT will provide repair or
replacement as described in the complete warranty statement.
To arrange for service or obtain a copy of the complete warranty statement,
please contact your nearest SIGLENT sales and service office.
Except that as provided in this summary or the applicable warranty Statement,
SIGLENT makes no warranty of any kind, express or implied, including without
limitation the implied warranties of merchantability and fitness for a particularpurpose. In no case shall SIGLENT be liable for indirect, special orconsequential damages.

Repackaging for Shipment
If the unit needs to be shipped to SIGLENT for service or repair, be sure:
1. Attach a tag to the unit identifying the owner and indicating the required
service or repair.
2. Place the unit in its original container with appropriate packaging material
for shipping.
3. Secure the container with strong tape or metal bands.
If the original shipping container is not available, place your unit in a container
which will ensure at least 4 inches of compressible packaging material aroundall sides for the instrument. Use static-free packaging materials to avoid
additional damage to your unit.

SPD3000X Service Manual41

Contact SIGLENTSIGLENT Technologies Co., Ltd
Address：3/F, building NO.4, Antongda Industrial Zone, 3rd LiuxianRoad, Bao’an District, Shenzhen, P.R.China
Tel：+86-755-3688 7876
E-mail: sales@siglent.com
http://www.siglent.com

SIGLENT Technologies America, Inc
Address: 6557 Cochran Rd Solon, Ohio 44139
E-mail: info@siglent.com
http://www.siglentamerica.com

SIGLENT Technologies Germany GmbH
Staetzlinger Str. 70, 86165 Augsburg, Germany
E-mail: info-eu@siglent.com
Web: www.siglenteu.com

42 SPD3000X Service Manual