hybridfree/eevblog-posts huggingface dataset:
ENA 5071 C not booting. - Page 1
Forum section: electronics / repair

author: rtekal
author_rank: Contributor
timestamp: March 06, 2021, 05:39:18 am
content: Hi,I have a E5071C ENA which fails to boot. The fans are running, No display on either internal or external display. The power supply voltages are good and the voltage LED's are lit up in both boards.The service manual says the cause could be either the DSP board or the digital motherboard and has to be replaced.There are two 7 segment displays at the corner on the digital motherboard, with POST code marking, and the code6.2 (or b.2)is displayed. There is no description of the POST codes in the service manual. I have tried reseating the CPU and DIMM module on the motherboard.Anybody having faced and resolved the same issue or have any service info.Regards

author: DaJMasta
author_rank: Super Contributor
timestamp: March 06, 2021, 05:45:14 am
content: Can you identify the brand of the motherboard or BIOS? Usually post codes are at least somewhat consistent between models, so it could give you a hint.If I were to guess, it has nothing to do with your DSP board, this is just a PC problem. These network analyzers are a regular PC that after booting to the OS it starts the software that talks to the network analyzer hardware, so you likely wouldn't see any error with VNA equipment until you're loading that software unless there's a dead short in a module pulling an important power supply rail down.If you still suspect it, you could try disconnecting the interconnect cards as the PC portion should be able to boot on its own as a normal PC without them, but I suspect the problem would persist in such a test.

author: rtekal
author_rank: Contributor
timestamp: March 08, 2021, 06:08:50 am
content: Looking at the images in the service manual, the MY461 series serial number has a standard motherboard. The MY462 and MY463 series have different motherboards with plugin CPU and DIMM memory module.This instrument has a MY463 series serial number.The mother board is not the standard type. Looks like a proprietary motherboard. There are monitoring points and LED's for various voltages. This is the variant in which the CPU and DIMM memory are on a single plug-in assembly. The Agilent logo is etched on the motherboard and the BIOS has a agilent part number.If I disconnect the DSP board, the instrument does not power on. Same is the case, If the interconnecting cables to the RF deck are disconnected. The instrument powers up even without the CPU and DIMM module. The POST code displayed0.0.I put back the CPU & memory module with the RAM removed, the POST code changed to1.5.
Encoder [for dial knobs] polarity - Page 1
Forum section: electronics / repair

author: EugenioN
author_rank: Contributor
timestamp: January 12, 2022, 10:22:49 pm
content: Hi all!I'm servicing a pro audio mixer (this one:https://www.soundcraft.com/en/products/si-impact), and I need a bunch of replacement rotary encoder. The genuine spares are quite an unobtainium stuff in small quantities, so I'm looking for a same specs, pin to pin compatible part.I've come across this Bourns encoder:https://www.mouser.it/ProductDetail/Bourns/PEC11L-4015F-N0020?qs=sGAEpiMZZMvy8cVzszrmR8xmhWWclkAFml9Qhvp67z0%3DThey are the exact same size, same pulses per rev and same pinout, but I really can't understand this quadrature output table (from datasheet):[ Specified attachment is not available ]The measured signals are shown here:It looks like A and B are swapped: when rotating CW I got rising edges of A (yellow) when B=HIGH (green) and viceversa during CCW rotation. The inversion occurs about at 200ms after trigger position. This is the opposite of every single quadrature encoder I've ever encountered, as per my experience.The actual circuit is exactly the same as the one depicted in the datasheet: one common tied to gnd, the A and B switches connect to positive rail via a couple of pullup resistors.Can those encoders be custom made for this specific product, with the only purpose of pissing off the service guy after discovering that 27 of those new little knobs turns the opposite direction than the old ones?Am I missing something?

author: Audiorepair
author_rank: Frequent Contributor
timestamp: January 13, 2022, 08:27:21 pm
content: It's possible the originals are reversed but unlikely.More likely something got lost in translation with the data sheet/interpretation.I have had a total of one rotary encoder replacement where the original was backwards, and one recently in a Sony Minidisk where the common was where one of the outputs normally are.You are going to have to do this anyway, so just fit one in the desk and see which way round it goes.

author: EugenioN
author_rank: Contributor
timestamp: January 19, 2022, 10:52:41 pm
content: Hi, I've just tested one brand new encoder and I can confirm: the original ones definitely have swapped A and B signalsThey're manufactured by AeTna (never heard of): rotational feedback torque is good and "smooth", and they seem of overall good quality, albeit the all failed in a short run.These ones from Bourns are dimensionally identical, but with a less appealing and cheapishtorque feedback: PEC11L-4015F-N0020 (datasheet here:https://www.mouser.it/datasheet/2/54/pec11l-777793.pdf)Cheers!

author: Audiorepair
author_rank: Frequent Contributor
timestamp: January 19, 2022, 11:05:51 pm
content: I have to say thats a pretty shitty trick from Soundcraft.Or maybe they got conned.
Endress Hauser Promag 50 flowmeter unable to complete start-up - Page 1
Forum section: electronics / repair

author: VvLl99
author_rank: Newbie
timestamp: July 07, 2022, 09:06:39 am
content: Hello all,I encountered this start-up issue with E+H flowmeter where the display will keep on flashing on the start-up message and unable to proceed to next message which is displaying the software version. I have replaced the power unit board but this did not solve the issue. Any advise?
Enertec Schlumberger 2710 counter Service Manual - Page 1
Forum section: electronics / repair

author: vasi_ro
author_rank: Unknown
timestamp: February 21, 2018, 04:53:35 pm
content: Does anyone have service manual or schematic of Enertec Schlumberger 2710 Universal Counter ?Thank you very much

author: wilhe_jo
author_rank: Regular Contributor
timestamp: June 25, 2021, 09:17:38 am
content: Hi!I would also need schematics/service manual/...Mine got pretty deaf... above 9Vpp, it perfectly works.Would be a pity if I would need to replace this perfectly working counter with oven...I found some schematics for another unit (https://www.eevblog.com/forum/repair/counter-repair-enertec-schlumberger-2618/) which were sufficient for me to get it working again... the actual schematics would be still appreciated, though.73
ENSONIQ DP/4+ DC Offset and Distortion adjustement - Page 1
Forum section: electronics / repair

author: rena
author_rank: Contributor
timestamp: August 22, 2024, 05:34:19 am
content: Hello, I recently fixed an Ensoniq DP/4+ (multi effector for music) that had a few dead opamps and now I would like to adjust the DC off set and distortion.Those parameters are adjusted with trimpots, but I don't understand what to look for and where.Can someone help me please ? I would like to understand what those two parameters do and how to adjust them.

author: Kurets
author_rank: Regular Contributor
timestamp: August 25, 2024, 01:51:32 am
content: I expect that DC offset is just to have signal centered around zero on the output of U16 (pin 7). The distortion adjust pin changes the low reference of the internal PCM DAC, so presumably you would adjust this for minimum distortion in the converted digital output. As this is some kind of effects processor I guess it goes back to analog somewhere, which you could also use as a point of measurement.Signal generator and scope with FFT function would be your friend I think.

author: rena
author_rank: Contributor
timestamp: September 06, 2024, 05:30:39 am
content: Hello, thank you and sorry for my late response !I've got a signal generator and a distortion meter at hand.FFT meter would be better ?"you would adjust this for minimum distortion in the converted digital output"Should I monitor the digitized signal at pin 27 of the AD converter ?
ENSONIQ DP/4 - Random attenuation on Data lines - Page 1
Forum section: electronics / repair

author: StEeLz
author_rank: Newbie
timestamp: December 31, 2020, 06:53:14 pm
content: Hi Gang,I am trying to troubleshoot an old Audio equipment with no boot / no display symptoms. So far I have found one dead RAM chip.However, I am still finding some weird behaviour on the MC68B03P I/O pins.As you can see on the pictures attached, I have some weird and random attenuation that doesn't seem right.Some High signals are peaking at 3.6V, and some others are at 5V as expected. I have traced the signal and removed all the surrounding components to only leave the CPU and the 2 EPROMS.I have swapped the CPU for multiple variants, and tested the EPROMS, everything seems to be OK, yet I'm curious.If those attenuated signals seem to be within specs, what would cause this?Looking forward to your thoughts!Cheers

author: m k
author_rank: Super Contributor
timestamp: January 01, 2021, 06:21:23 pm
content: Lower picture has something I'd say is faulty, those that are not coming down and 3,6V is a bit high for high impedance.Overall shapes should also be more retangular.Have you just tested those ROMs and not changed them?
EP-613 power supply diagnosing fault - Page 1
Forum section: electronics / repair

author: cipek
author_rank: Newbie
timestamp: July 12, 2025, 09:44:09 am
content: Hi all,I've been trying to repair that linear power supply for a while now. It's a triple output linear 0-30V, 12V, 5V bench psu. Both the voltage on the display and measured show around 40V. Initially I needed to replace 2 0.5Ω sensing resistors, JRC 4558 opamp, and one of the 2N3055. It seems to work, but under load the current would go up with voltage barely moving to maybe 1.5V max before the current was at its max. Then it stopped working again, and I needed to replace 2N3055 plus opamp. Ive checked the diodes, transistors, output cap, and probably most of the resistors.I don't know I needed to tweak one of the pots... What would you recommend next?Thanks

author: MathWizard
author_rank: Super Contributor
timestamp: July 18, 2025, 02:34:12 pm
content: I can't find a schematic yet, but it seems there a few brands using a similar xx-613 name.https://www.eevblog.com/forum/repair/manson-velleman-etc-ps-613-bench-power-supply-repair-schematics-needed/Working blind without a schematic, is crazy, if you have the time, I'd recommend making your own schematic in a circuit simulator like LTSpice. That's what I did with my latest PSU from the 1990's. It also has clones with other brands, but I couldn't find the exact schematic. It had several adjustment pots, like for allowable min/max voltage and current.So what load were you using, when the voltage only went to 1.5V ? But you say the current keep going up ? Was that according to the PSU's meter's, or did you also check with a multimeter ? How hot were the 3055's getting then ?So then you replaced another 3055 and op-amp, what are some more details? Was it the same ones you replaced before? Were they damaged, what happened, what pins don't work?
Epox/Pronix P55-VP3 motherboard - Page 1
Forum section: electronics / repair

author: oh2ftu
author_rank: Regular Contributor
timestamp: September 02, 2023, 12:53:46 pm
content: Hi there.I've been repairing an older motherboard. This started as unknown status when I got it.No boot, recapped it. Still no boot, but it blew a SOT-23 (QA1) komponent starting with "35" that's inbetween the 5V rail and a PLL52C64-05BSC.Control seems to be 12V via a 10kOhm resistor. Don't know where it buggers off.I replaced it by trial and error a and got it to pass +5V to the PLL.However. I'm still getting +5V to the CPU (should be 3,3V).I've located two SOT-23 components marked 1P and 72JXQ that both seemed blown (low values or shorted). Replaced with a 1P from the same board (fan header) and K72-marked from another board. My guess is these are a NPN-transistor and N-fet (2N7002).Still. +5V.The big FETs (NDP603AL) have been replaced with something near similar from Digikey. Still no go.I'm looking at a SO/SOIC-8 package marked AR7010/G9735.What could it be?Here's what I've tried to find out as pinout:1 ?2 Feedback from cpu VCC3456 GND7 VCC8I will add pictures.

author: oh2ftu
author_rank: Regular Contributor
timestamp: September 02, 2023, 12:54:25 pm
content: This is the power supply area

author: oh2ftu
author_rank: Regular Contributor
timestamp: September 02, 2023, 12:56:25 pm
content: This is the PLL area
Epoxy for pcb trace repair - Page 1
Forum section: electronics / repair

author: alan.bain
author_rank: Regular Contributor
timestamp: April 23, 2022, 11:01:38 am
content: I used to have supplies of a very low viscosity high temp epoxy for gluing down trace repairs on PCB (such as those frames made by Pace or CirKit or even slightly less expensively from ebay). I'm finding it very hard to find a supplier at a sane price.The only place I can find it is BESThttps://www.soldertools.net/pcb-repair-epoxy-resin-and-hardner-10-packets/which costs a stunning $150 for 10 sachets. Now I know epoxy can be expensive but this is a bit over the top.I'm not looking for epoxy overcoat to protect the repaired tracks - need it to stick down SMD pads etc.Is there a standard product from an epoxy resin provider? I don't mind buying in quantity as usually epoxy keeps well, but sachets are a bit of a one-use thing!Alan

author: Smoky
author_rank: Frequent Contributor
timestamp: April 23, 2022, 02:32:29 pm
content: JLCPCB has been on the top of this message board as long as I've been on it.I can't think of anyone better to contact regarding PCB trace adhesive.Their PCB prices always seemed reasonable so maybe they could make available small amounts of the epoxy.

author: jpanhalt
author_rank: Super Contributor
timestamp: April 23, 2022, 02:42:10 pm
content: I have never used this, but it advertises 500°F.https://www.homedepot.com/p/Permatex-0-84-fl-oz-500-Degree-High-Heat-Epoxy-84102/315089205The viscosity of epoxies is due to fillers and other agents (e.g., thixotropic) added for workability. For my models, I use MGS epoxy which is close to cream thin, until I add something.https://www.cstsales.com/mgs_epoxy.htmlI would search first for high temperature epoxy and within that "laminating" if you want something that might wick into a narrow space.
EPROM DATA for  HP54601A and HP 54602A - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: December 30, 2020, 07:26:17 am
content: hi AllNeed Eprom data for the above mentioned modelspart number of EPROM 5460080005 and 5460080007photo attachedThanks in advanceregards
EPSON DX5 blown fuse (not firing/printing) - Page 1
Forum section: electronics / repair

author: bjquines
author_rank: Newbie
timestamp: September 29, 2020, 11:10:22 am
content: Hi! I'm new to this forum and was wondering if there's someone here who is familiar with large format printers.I have a printer that prints blank/ no ink is firing. I attached a photo of the Carriage Board.Already replace 2 fuse encircled in red. But the head is not firing.Hoping to hear from you awesome guys!

author: perieanuo
author_rank: Frequent Contributor
timestamp: September 30, 2020, 01:17:57 pm
content: hi,well, the fuse dies AFTER the semiconductorsearch the current path starting from your replaced fuses, it will lead to some voltage regulator or to some power transistorhelp us to help you

author: bjquines
author_rank: Newbie
timestamp: September 30, 2020, 01:50:50 pm
content: Hi, thank you for your reply. Already checked the transistors and it is working fine. Any advise on what to do next? I'm a newbie with this sorry

author: coromonadalix
author_rank: Super Contributor
timestamp: September 30, 2020, 05:28:25 pm
content: i hope its not a gimmick like samsung printers, they deliberately blow the fuser fuse pretending that the maximum printable stuff is donecould be a firmware issue like a protection ... made to buy parts ...
Epson EB 675wi power supply repair - Page 1
Forum section: electronics / repair

author: gkmaia
author_rank: Frequent Contributor
timestamp: January 06, 2025, 03:29:03 am
content: I recently purchased an Epson EB 675wi projector.There is no sign or life in it. So decided to start through the power supply.There two output connectors.One goes to the main board.Pins 1,2 and 3 have no voltage. I suspect they may be switches controlled by the motherboard.Pins 4,8,9 and GNDs.Pin 5,6,7 have 10VDCPin 10 3.3VDCThe second connector at the base of the 400VDC caps connects to another board. I believe could be a step up high-voltage, not sure. Howver I get only 1.5v there and considering the high voltage caps I suspect something may be wrong. Or one of the 3 switches on the main board connector enable that output.Anyone out there with some experience with this particular power supply?

author: Dougmc
author_rank: Contributor
timestamp: January 06, 2025, 03:38:17 am
content: Did u check the 2 black rectangle fuses.one has a t5al

author: poot36
author_rank: Frequent Contributor
timestamp: January 06, 2025, 04:11:52 am
content: If you are really lucky on the bottom of the power supply or on the board that the low voltage connector plugged into there may be silk screen markings of what each pin does or a voltage listed. Judging by your voltages it at least looks like the standby power is active. Can you see if the power button on the projector has 3.3V on it? You may also be able to find a service manual for this unit but I could be wrong.

author: Poroit
author_rank: Frequent Contributor
timestamp: January 06, 2025, 04:58:47 am
content: G'day gkmaia,Can we see a pic of the other side of the PCB?The attached may assist you with fault finding.

author: gkmaia
author_rank: Frequent Contributor
timestamp: January 06, 2025, 06:49:52 am
content: Quote from: Dougmc on January 06, 2025, 03:38:17 amYes, they are both goodQuote from: poot36 on January 06, 2025, 04:11:52 amI did find a service manual after deep seach however no voltages documented. Very high level maintenance and troubleshooting.

author: poot36
author_rank: Frequent Contributor
timestamp: January 07, 2025, 01:39:01 am
content: Do you have access to a oscilloscope? If you do can you please check the pins that you have listed as having voltage when the power supply is connected to the projector?
Epson EH-TW550 projector no longer powering up properly - Page 1
Forum section: electronics / repair

author: glymph
author_rank: Newbie
timestamp: February 29, 2020, 09:46:55 pm
content: Hi folks,I have an Epson EH-TW550 which has been working perfectly for about 10 years, and it suddenly turned itself off yesterday whilst watching something. It appeared to have overheated (flashing red power LED), so I unplugged it and left it over night. It still didn't power up the next morning, so I unplugged the lamp unit and plugged it back in again, and it powered up ok once and the image appeared to be fine. With subsequent attempts to power the unit on from cold, it spins the fan slowly for a couple seconds then fast and the green LED flashes (apparently this is normal during initialisation, but that used to just take a few seconds) - it never gets beyond this point.Do the lamps on these units fail like this, or is it more likely something else is happening? Have I reached some time limit that I need to reset on the unit, perhaps? Since the fan is working fine, I doubt replacing it will help, but that's certainly a lot cheaper than getting a new lamp. If I'm going to do that, I may as well pay a little more and get a new projector to be certain, although it would be a shame to waste an otherwise working projector.Any suggestions most welcome.thanks
Epson EH-TW6700 auto iris error - Page 1
Forum section: electronics / repair

author: ApertureScience
author_rank: Contributor
timestamp: November 14, 2020, 09:52:23 am
content: I bought a broken Epson EH-TW6700 projector with mainboard failure. After booting up it showed the auto iris error. So I took it apart and had a go at it. Its not really an iris, more like an eyelidAfter cleaning the mechanical parts, as suggesgted by the internets, nothing happened. So I probed around, no signal on the motor whatever. After probing the driver IC, a TI DRV8846, I wasn't seeing any voltage.The dead DC-DC converter responsible is a TI TPS54335A. Currently waiting for the part, but i hope that settles that.

author: ApertureScience
author_rank: Contributor
timestamp: November 18, 2020, 08:41:41 am
content: UPDATE: IT'S ALIVE!

author: dan776
author_rank: Newbie
timestamp: June 02, 2022, 06:02:56 pm
content: Hi ApertureScience,I also have this error, but I am not so experienced in measuring.Is the DC-DC converter on the mainboard or directly on the iris panel? Does the part have to be disassembled and measured or in the installed state? How to measure is of course also interesting to me.I would be very happy if you can help me.best regardsDan

author: David_AVD
author_rank: Super Contributor
timestamp: June 02, 2022, 11:55:51 pm
content: I have an Epson EH-TW5000 that went back under warranty for an auto iris issue (many years ago).If it happens again I'll have to see if I can fix it in a similar way.

author: malebuffy
author_rank: Newbie
timestamp: July 21, 2022, 08:08:01 pm
content: Quote from: ApertureScience on November 18, 2020, 08:41:41 amMine too!!!!! Thanks very much! Basically if your Auto Iris looks just fine, it's the Dc-DC converter that needs replacement!It's not an easy task, but if you have done some micro soldering you should be fine!
Epson EH-TW6700 since today shows only light blue image - Page 1
Forum section: electronics / repair

author: pikim
author_rank: Newbie
timestamp: February 21, 2024, 07:56:31 pm
content: Hello,I have an Epson EH-TW6700 projector which worked like a charm until yesterday in the evening. When I started it today it showed the desired image in very strange colors. I turned it off an on again and since then it only shows a light blue image. Depending on the content it should show, it sometimes gets a bit lighter and darker, but the whole screen has the same color. It also doesn't show the menu. Changing the HDMI input also doesn't help.Anyone ever heard of such a behavior? Any ideas?
Epson EH-TW9000 Mainboard faulty - Page 1
Forum section: electronics / repair

author: nabruxas
author_rank: Newbie
timestamp: March 30, 2019, 11:20:05 pm
content: Having an Epson EH-TW9000W, 3 LCD Projector, with a defective Mainboard. Both LEDs (Lamp & Temp) are flashing red, which means "internal error" as described in the user's manual.After turning on the blue standby led flashes, fans are starting, lamp strikes, lens cover opens.After approx. 3-5 seconds lamp extinguish, lens cover closes, fans rotating at full speed and unit goes into error mode, fans continuing rotating at full speed until power off by main switch.I swapped the Mainboard from a working PJ. All fans, other PCBs and optical unit are working excellent, so the issue is definitely on the mainboard. I checked the temperature with my thermal camera and found a very hot spot (80°C) at IC303 (Panasonic MN864773AKE). The Voltage on the linear regulator IC302 (NJM2884ADL3-33) dropped to 1V!So, I unsoldered the IC303 with my rework station. Now, the voltage at the regulator is fine.I changed IC303, 3,3V is OK(!) now, but the problem as described above is still the same.Does anyone have a circuit diagram, service manual or an idea how to fix it?The problem is definitely on the mainboard!My E-Mail adress is: 0662(at)gmx.atIn advance, thank you so much for helping!!Please Note:I am not a crossposter, but asking also here for help:https://www.avforums.com/threads/epson-eh-tw9000.2223596/

author: amyk
author_rank: Super Contributor
timestamp: March 31, 2019, 01:54:57 am
content: I couldn't find a datasheet but there appear to be plenty of sellers carrying the MN864773AKE, which has a description of "HDMI receiver". Given that function and the fact that it's probably connected directly to the HDMI input, I'm not surprised that it's dead. You could try replacing it.

author: nabruxas
author_rank: Newbie
timestamp: March 31, 2019, 03:10:26 pm
content: @amyk: Thank you for your reply. The HDMI controller is changed and new. The supply voltage of the chip is correct now. I spent many, many hours to compare a good and this faulty mainboard.I need information regarding the LED error code to search the appropriate part . A service manual, the circuit diagram or a helpful hint will be the best.

author: Peter_Pan
author_rank: Newbie
timestamp: March 18, 2021, 02:35:53 pm
content: Hello,I have the same error. I took it also to Epson. The answer was "ROM ERROR. Mainboard faulty." It can't be repaired because the components are "end of life". A real disappointment.Anyway, did you succeed to repair it?Thank you.
Epson projector EH-TW3200 bulb issue - Page 1
Forum section: electronics / repair

author: reyntjensm
author_rank: Regular Contributor
timestamp: May 15, 2024, 06:17:54 pm
content: I have an Epson EH-TW3200 projector doing strange things with the bulb.The device turns on as it should, starts to project an image and shuts down after about 20sec.Blinking LED indicates a defective bulb. It's strange as this bulb only has about 200 hours and I would expect the bulb to not turn on at all if its broken.Any advice on this? Does the bulb has any kind of driver circuit in this type of device?

author: Gyro
author_rank: Super Contributor
timestamp: May 15, 2024, 07:04:23 pm
content: Cheap aftermarket lamps can cause this sort of problem because the ballast monitors the discharge voltage for imminent lamp failure detection. The aftermarket ones tend to use a generic discharge tube rather than one that matches the original manufacturer lamp characteristics.I don't know if that's the problem in this case but I've seen similar behavior with Infocus projectors.
Epson RTC63421 - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: March 10, 2021, 03:17:35 am
content: Is there any suitable replacement for the Epson RTC63421A? I've found them on eBay before but they turned out to be fakes even though I bought them from LittleDiode. I see utsource offer them and in necessary I'll order ten of them and take the USD30 shipment hit so long as I can be sure about them.However before doing that - does anyone know of a pin compatible replacement? ISTR there used to be a "Master XREF" that seems long gone.D.

author: perdrix
author_rank: Frequent Contributor
timestamp: March 28, 2021, 12:58:01 pm
content: Failing a drop in alternative - does anyone know of a reliable supplier for these ICs that won't charge me an arm and a leg for shipping to UK
Epson WF-100 schematics (reuse for PCB prototypying) - Page 1
Forum section: electronics / repair

author: nighthunter
author_rank: Newbie
timestamp: November 09, 2023, 12:05:35 pm
content: Hi friends,im looking for schematics or pinout of Connectors (epecially head and mechatronics) I want to reuse the mechanics and/or the print head for applying photoresist and mask. I know that the head uses serial data stream to control but my printer is a scrap one so pinouts would really help me out. Can someone help me?Best regards
Epson XP-15000 (CG43/CF15 MAIN) — 42 V rail drops to ~4 V, F2 blown — looking fo - Page 1
Forum section: electronics / repair

author: oldewe
author_rank: Newbie
timestamp: September 22, 2025, 08:53:04 am
content: I’ve got an XP-15000 that suddenly wouldn’t power on. Did the basic checks (mains lead, plug fuse, reseated connectors). The external PSU measures normal ~40–42 V open-circuit, but as soon as I plug it into the mainboard (with everything else unplugged: front panel, motors, printhead ribbons removed), the rail collapses to about 4 V.I found the F2 fuse is open; it’s on the 42 V input path. Even with F2 blown, the pre-fuse side still drags the PSU down to ~4 V, so there’s a load/short on the board before the fuse. I’ve checked the obvious caps and diodes around the input area but I’m struggling to pinpoint the culprit.Has anyone with experience on the XP-15000 / CG43 (CF15 MAIN) seen a common failure here (TVS/MLCC/MOSFET location that shorts the 42 V pre-fuse rail)? Any pointers on hotspots to probe or parts IDs to lift first would be hugely appreciated.

author: Swake
author_rank: Frequent Contributor
timestamp: September 23, 2025, 08:33:15 am
content: Something looks meh... in that cornerFrom 40 V to 4 V is not a short, but close. It tries pulling a lot of amps, way more than that poor power supply can provide. If it is not going into protection mode then something must be heating up. If you do not have a thermal cam at hand then it is possible to check that with IPA or lighter fluid. Spray some on the suspect area, it will evaporate very quickly when heated.Your fuse is gone and it is still pulling the supply down. This means there is something wrong before AND after the fuse as the issue before the fuse should not blow the fuse. Or it is the fuse (holder/tracks) itself that makes trouble.

author: oldewe
author_rank: Newbie
timestamp: September 23, 2025, 07:42:07 pm
content: Thanks for the reply, yes I forgot to mention that suspect area was just from me with the heat gun between those connectors, which I’ll end up replacing if I manage to find the problem.I’ve had a go with ipa on the whole board and the only place which tends to heat first was an IC chip on the back, which when removed still pulled the 42v net to 4v. I’ll do some more tinkering as I’ve put it to one side for now.
ePure swissvoice red DE phone - Page 1
Forum section: electronics / repair

author: BreenBoks
author_rank: Newbie
timestamp: October 04, 2022, 08:08:26 am
content: Hi everyone,I recentely purchased an ePure swissvoice red DE telephone without the power adapter. Opening the phone I can see that the adapter supplies two voltages. Does anybody know what they are?Thanks for your time.

author: PeDre
author_rank: Contributor
timestamp: October 04, 2022, 09:30:01 am
content: Power Adapter Output:1-2 = 6.5V DC 300 mA5-6 = 7.5V DC 200 mAPeter

author: BreenBoks
author_rank: Newbie
timestamp: October 04, 2022, 09:45:11 am
content: Thanx!

author: Whales
author_rank: Super Contributor
timestamp: October 04, 2022, 10:19:49 am
content: Those numbers seem weird. Only 1V difference?PeDreAre you able to check if the two supplies are fully isolated or if they share a reference rail?

author: PeDre
author_rank: Contributor
timestamp: October 04, 2022, 10:43:52 am
content: I measure 7.7 V and 7 V in the unloaded state, and cannot measure a common ground, so the voltages are isolated. There is also a charging station that looks the same, it only needs a voltage of 7.5 V.Peter
Equilibrium EVO Touch RC Charger - Page 1
Forum section: electronics / repair

author: janicektrnecka
author_rank: Newbie
timestamp: February 09, 2023, 11:03:35 am
content: Hi everyone, does anyone know the part number or where to get the LCD and probbably also the resistive digitizer? as its sandwiched together? I have problem identyfing the correct part.I am going to retrieve this charger and get the display out and take detailed photos.
Equipment enclosure cosmetic repair - Page 1
Forum section: electronics / repair

author: rfdes
author_rank: Regular Contributor
timestamp: April 05, 2022, 01:43:05 pm
content: Hi -I'm looking for advise in regards to refurbishing test equipment cabinets that use the orange peel textured plastic (vinyl?) glued to sheet metal. I believe most of the HP/Agilent equipment used this material. As we all know, this material is soft and get chewed up over time and handling. If the cabinet is fairly simple in construction, it seems like you could glue another layer of this material on top of the existing material.Does anyone know if this has ever been done?Is it possible to remove the existing vinyl material? Using heat perhaps?Is it even possible to purchase this material that might closely match the orange-peel texture in the correct color?Anyway, hopefully someone has some first hand knowledge whether this is feasible. I have a couple of pieces of equipment where the cabinet is severely damaged with huge scratches and scrapes.Looking forward to your opinions.Jim

author: marcumr
author_rank: Contributor
timestamp: April 05, 2022, 01:57:14 pm
content: Hello.I am in the process of restoring a Systron Donner 6054b, I have the same problem with the top and bottom lids, there are a lot of scratches on the vinyl.

author: themadhippy
author_rank: Super Contributor
timestamp: April 05, 2022, 02:16:04 pm
content: Quotetolex?Heat and gentle pulling will often remove it,but the glue is often solvent based so do it outdoors
Equivalent for HP 1855-368? Is it that special? - Page 1
Forum section: electronics / repair

author: Jeff L
author_rank: Contributor
timestamp: April 18, 2021, 09:13:01 pm
content: Haven't been able to find an equivalent so far.

author: bdunham7
author_rank: Super Contributor
timestamp: April 18, 2021, 09:16:59 pm
content: Can you post a clear close-up photo of it? How is it marked?

author: Jeff L
author_rank: Contributor
timestamp: April 18, 2021, 09:26:19 pm
content: It' an approx. 1/8 in. diameter transistor that I haven't un soldered yet. I doubt my camera could get anyuseful pic of it.

author: bdunham7
author_rank: Super Contributor
timestamp: April 18, 2021, 09:28:21 pm
content: Well, it is an HP 1855-0368.Which crosses to Siliconix FN2861 or National Semi SF55042, neither of which seems to be current production. I haven't yet found a datasheet for either. Sphere.bc has the original HP part in new and used.

author: Jeff L
author_rank: Contributor
timestamp: April 18, 2021, 09:43:04 pm
content: You mean ALL the numbers in electronics are important? Just kidding --thanks for your help.
Equivalent for RFP18n10 MOSFET? - Page 1
Forum section: electronics / repair

author: spacehitchhiker42
author_rank: Newbie
timestamp: December 01, 2024, 09:51:17 pm
content: I'm trying to repair a Copley servo drive that appears to have suffered a shoot-through. the MOSFETs appear to be driven by tc4426cpas. The high side has IRF9540s, which i can get for a decent price. The low side has RFP18n10s, which I can't find for less than $10 each. I think from some basic parameter matching that IRF540PBFs can be used instead, what do you guys think?
Equivalent replacement parts advice?  - Page 1
Forum section: electronics / repair

author: g.costanza
author_rank: Contributor
timestamp: September 13, 2023, 02:18:21 pm
content: Is this the right place to make this request? I need a pair of parts to replace two BYV32E 200 PJA1921 C4 9115. Will any "BYV32E 200" work? I'm still learning. Can someone point me to an equivalent part? I'm in the US. Assuming they're in stock, which parts supplier is fastest (standard) shipping, and lowest cost? Thanks!

author: u666sa
author_rank: Frequent Contributor
timestamp: September 13, 2023, 02:40:16 pm
content: I mean, if it's problem sourcing it. You should be able to replace it with two diodes.But it doesn't look like a sourcing problem. More like a time problem.

author: DavidAlfa
author_rank: Super Contributor
timestamp: September 13, 2023, 02:46:28 pm
content: Yes, any any "BYV32E 200" will work.
Equivalent thyristor help needed - Page 1
Forum section: electronics / repair

author: .RC.
author_rank: Frequent Contributor
timestamp: October 16, 2023, 01:36:03 am
content: I have a rotare phase converter here and after checking the error code and pulling out the control boardsone of the thyristors has gone short circuit and another only measures 4k resistance while the two others measure 1M.The manufacturer just has message bank, and not got back to me yet ( I suspect it is only a small business so must be busy), so was wanting to just get two equivalent thyristors. Not sure if the originals are easily available. I found the spec sheet for the original, 90 amp 1800V models, it seems 1600V versions are more readily available.Pictures of the thyristor numbers attached and a pdf of the thyristor spec sheet.

author: .RC.
author_rank: Frequent Contributor
timestamp: October 17, 2023, 12:24:09 am
content: No One?I found these?https://www.digikey.com.au/en/products/detail/powerex-inc/CD431690C/2812669https://au.element14.com/powerex/cd421690c/scr-rectifier-modules-90a-1-6kv/dp/2093855https://fastron.com.au/products/mfc90-16?_pos=1&_sid=5517ba2bb&_ss=rhttps://www.aliexpress.com/item/1005005640342412.htmlhttps://www.aliexpress.com/item/1005005761485791.html
Ericsson FSU 995 PM SM MM Fiber Fusion Splicer  - Page 1
Forum section: electronics / repair

author: johningram
author_rank: Newbie
timestamp: April 10, 2025, 06:39:41 am
content: We have a number of these now obsolete machines and hardest part is that there is very little service information available, so this a very optimistic request for any one who might worked on these machines if they any technical information on them.
Ericsson R380s firmware images available anywhere? - Page 1
Forum section: electronics / repair

author: akku46
author_rank: Newbie
timestamp: April 09, 2025, 04:19:46 pm
content: I have two Ericsson R380s phones that may have corrupted memory. One doesn't boot at all and doesn't charge, the other boots but crashes within 30 seconds or so. Both used to work 15 years ago.I already have most tools needed for reflashing the phones except the actual firmware.Does anyone know where to get firmware images for this phone these days?
error code ps2 prt-0001  yamaha 683 receiver - Page 1
Forum section: electronics / repair

author: rexjred
author_rank: Newbie
timestamp: August 30, 2019, 01:44:31 am
content: Yamaha rxv683 receiver in diagnostic mode displays error code ps2 prt-0001.

author: rexjred
author_rank: Newbie
timestamp: September 16, 2019, 07:20:43 am
content: need help.

author: PKTKS
author_rank: Super Contributor
timestamp: September 16, 2019, 02:27:43 pm
content: YAMAHA codes:- psX stands to POWER SUPPLY X error- prt stands to a guess where the fault was spotted- XXXX number indicates the reading which triggered the faultIn this case you need to review the PSU asap.Paul
Error E21 - need a bit of help - Page 1
Forum section: electronics / repair

author: Grubi
author_rank: Contributor
timestamp: April 01, 2024, 08:04:33 am
content: Hello, I guess you laugh on me... Trying to repair old japanese rice cooker ECJ-AD18E (I think inductive one), with error on display E21. Seems nice and clean, except natural aging - no sign of damage. I replaced also 3V battery, old one was dead, so display and clock works wellSince it is inductive - coil give me 0.6 Ohms and I can't see any failed temp fuses. I can't find any manual or comment on such error. I know - it is very old, but have santimental value...Thanks in advance if someone can give some direction! If I am totally on a wrong place, delete my post.

author: m k
author_rank: Super Contributor
timestamp: April 05, 2024, 12:48:08 pm
content: With electronics.Right place, no doubt.Take few pictures.
ES030-5 Delta Elektronika Power Supply schematic needed - Page 1
Forum section: electronics / repair

author: hub
author_rank: Newbie
timestamp: December 21, 2024, 01:13:39 am
content: My Delta Elektronika ES030-5 power supply was damaged during normal operation (continuous load about 60% max power for 2-3 hours).https://www.delta-elektronika.nl/products/es150-seriesI found several damaged components – transistor (desoldered), converter controller, passive components.I would like to fix it, but I can't read the value of some elements. Does anyone have such a power supply and could read the values of the components next to the transistor? I searched for a schematic of the power supply, but to no avail. I asked the manufacturer, but he does not provide any service manual or schematic.I attach a view of the power supply board.

author: cte
author_rank: Regular Contributor
timestamp: December 22, 2024, 07:42:34 am
content: ET has a circuit diagram, but it looks like a different revision:https://elektrotanya.com/delta_elektronika_es-030-5_0-30v-5a_labor-supplies_sm.pdf/download.html

author: hub
author_rank: Newbie
timestamp: December 24, 2024, 09:08:38 am
content: Thanks for the schematic.The diode in the SOT-143 package connected to the transistor gate (I read a part of the signature - JT) is probably BAS28. In the older version, it was 1N4148.
ES121 Dropped - Help a brotha out - Page 1
Forum section: electronics / repair

author: Anthrax-VX
author_rank: Newbie
timestamp: December 18, 2024, 06:12:30 am
content: whats going on guys, i dropped my little screwdriver (miniware es121) and the screen broke, no big deal, ordered a replacement, but the drive of the screwdriver became sporadic and would go on and off in bursts while using it. Dove into it a little bit more and noticed a little crack on an smd component (in pics), so i used my exacto knife and pulled the piece to see if it indeed was a crack, and it was. it took off a little chunk to reveal some copper windings inside (at least thats what it looks to be)I know the es121 is "open source" but i think that is just the firmware rather than hardware etc. so i could not find a component schematici do believe this is an SMD inductor but i thought to employ the you guys to help me investigate.here are my questions:1: is this component in fact, an inductor?2: do i just measure to find the dimensions, and then how do i correlate that to a size of component, in name, for ordering purposes3: how do i find characteristics needed for this component (measuring mH or something along those lines)I do appreciate the help, im very new to schematics and component level repair, and i appreciate any help.Also, does a cracked component like an inductor mean its typically failed? and exhibiting the symptoms i described be possible from a faulty inductor? just want to see if im on the right track and not missing something, this component does happen to be right next to the 3 axis accelerometer - MX6208

author: elektryk
author_rank: Regular Contributor
timestamp: December 18, 2024, 10:30:18 am
content: This little crack might change inductor parameter a bit, but it still should be operable.

author: Anthrax-VX
author_rank: Newbie
timestamp: December 18, 2024, 07:24:07 pm
content: yeah thats what i thought, wonder if the accelerometer took a dump after the drop, i ended up finding the same physical sized inductor in a vape, im going to test it today, if it still functions the same way, ill change out the accelerometer

author: Anthrax-VX
author_rank: Newbie
timestamp: December 30, 2024, 03:57:14 am
content: replaced the screen, its working however still exibiting the stuttering/stopping behavior, thinking it may be the acceleromter but also maybe that chip next to the inductor, its a 6 pin surface mount, labeled THAG9 or THA69, cant find any info on it, any ideas? ill be ordering the accelerometer just thought might as well order that while im at it.
ESAB CaddyTig HF TIG inverter welder repair. - Page 1
Forum section: electronics / repair

author: pappkopp
author_rank: Contributor
timestamp: December 28, 2017, 12:34:26 am
content: Hello, this wont be your normal test instrument repair but i hope it will be interestingI’m trying to repair a inverter TIG welder i just bought, but i cant seem to understand it completely, the problem is that it wont power up, the main rectifiers are working, but there is no power to the logic section. I have have had a look at the service manual, and measured the points that are mentioned, i tried to replace a swiching mosfet. The D²Pak in the right corner (for the logic part i belive, internal diodes showed up as open circuit)Please see the attatched service manal, as you can se on the Picture, there are two screw terminals, here is a +325VDC voltage measured and correct, and i belive it is somehow switched with the mosfet into the red/orange transfomer marked «UTK»Could someone please help me troubleshoot this? There is no voltage at the output of the transformer, or the linear voltage regulators.Kind regardsAnd thanks in advanceService manual:https://www.manualslib.com/manual/989932/Esab-Caddytig-Hf.html

author: ivi_yak
author_rank: Regular Contributor
timestamp: December 28, 2017, 04:52:37 pm
content: hi, could you check in out voltage on linear reg?

author: pappkopp
author_rank: Contributor
timestamp: December 28, 2017, 08:39:00 pm
content: There is no voltage on the regulators.

author: oldway
author_rank: Super Contributor
timestamp: December 28, 2017, 09:13:18 pm
content: The service manual does not contain the detailed diagrams nor the drawings of the PCB tracks as it is based on the modern principle of exchanging defective electronic cards with new cards.It is not planned to repair the cards yourself.So, it is necessary either to inquire with the ESAB representative on the possibility and the cost to exchange the card,or to do reverse engineering ....If you do not help, without the diagrams, we also can not help you ....Follow the tracks of the printed circuit and look for where the 5V power supply for logic circuits is coming from and why there is no voltage .... It seems to me that the 5V is produced from 19V or 24V ... .Avoid changing components if you are not 100% sure that the part is defective.Be very careful, in this device, there are high voltages that are not isolated from the network, it is very dangerous.

author: KADOisblue
author_rank: Newbie
timestamp: July 11, 2023, 10:55:36 pm
content: Hi Guys, I know this thread has been dead for quite some time. However I'm going to try my luck...I have the same ESAB CADDYTIG HF welder with a different fault to the one described , two surface components have failed on the same control board and I cannot read the part numbers on them.I have attached pictures.Does some one have access to the schematics?Or have better photos of the circuits that would show me the part identification labels.Thanks in advance.Bret Martin
Escort 3136A  schematics / service manual - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: April 02, 2021, 09:42:48 am
content: Hi Folksneed help with schematics. DC Voltage range not functioning.reading an offset of 1 V with no input connected. Ohms and current working okThanks in advance

author: coromonadalix
author_rank: Super Contributor
timestamp: April 02, 2021, 11:09:04 am
content: good luck, never saw any leaked Escort branded meter SMyour best luck would be to trace down the signal paths and try to find some defective or busted partsShow us photos, take parts numbers and try to find specs / datasheets ??
Escort 3146A repair help - Page 1
Forum section: electronics / repair

author: abdul
author_rank: Newbie
timestamp: October 29, 2019, 08:35:45 am
content: Hi i need help in Escort 3146A digital multimeter i cannot measure current for both AC and DC other than that i can measure oms dc voltage but AC voltage also i cannot measure so any idea which components fail

author: gboutique
author_rank: Newbie
timestamp: May 04, 2021, 03:33:08 pm
content: This post is old, but it is important to say that the Agilent U3402A (90% Escort 3146A), presented the same fault, everything worked less current measurement. Fixed by re-welding the current shunt. Review all the weld points in this session.