Repair: Druck DPI 515 - Page 1
Forum section: electronics / repair

author: Riq
author_rank: Contributor
timestamp: April 28, 2025, 11:27:41 pm
content: I'm currently repairing a Druck DPI 515 at work. It appears to power up correctly, but the display and keypad are not working at all. I checked and there's no power getting to that circuitry. Does anybody have any idea where I should check next?

author: Poroit
author_rank: Frequent Contributor
timestamp: April 29, 2025, 09:09:49 am
content: Contact Baker Hughes Customer Care and see if you can get a circuit drawing.druckcustcare@bakerhughes.com

author: Riq
author_rank: Contributor
timestamp: April 29, 2025, 12:06:18 pm
content: Thanks. Will try and post an update.

author: Riq
author_rank: Contributor
timestamp: April 30, 2025, 12:22:10 pm
content: Still no response from them. Meanwhile I was able to identify a burned resistor (R134) and now the front PCB is getting power, but the display is not working yet.

author: Riq
author_rank: Contributor
timestamp: April 30, 2025, 03:45:06 pm
content: Does anybody know if XL3 (40MHz) should be mounted? Here it was hanging by a pin.

author: Poroit
author_rank: Frequent Contributor
timestamp: May 01, 2025, 06:43:35 am
content: Do the internals of your DPI515 look like the attached?Is that the Crystal I have arrowed?

author: Riq
author_rank: Contributor
timestamp: May 02, 2025, 12:14:20 pm
content: It is not exactly the same, but it is pretty similar. And yes, that is the crystal I mentioned.

author: Riq
author_rank: Contributor
timestamp: May 02, 2025, 04:26:57 pm
content: Update: Druck send a section of the schematic, the one involving the RJ45 power circuit.Simulating the 40MHz with a Function generator made the display power up.

author: Poroit
author_rank: Frequent Contributor
timestamp: May 03, 2025, 06:30:48 am
content: Well done.As you are probably aware, that crystal would be part of the Oscillator for the clock signal.Is the DPI 515 now operating correctly?

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: May 04, 2025, 08:01:09 am
content: Quote from: Poroit on May 01, 2025, 06:43:35 amHello Poroit,Wow, the unit you pictured was severly jolted

author: Poroit
author_rank: Frequent Contributor
timestamp: May 05, 2025, 06:37:39 am
content: It sure was timeandfrequencyThey still wanted $1049.30 USD for it on ebay.

author: Riq
author_rank: Contributor
timestamp: May 07, 2025, 05:12:11 pm
content: The device is now somewhat operational. The screen turns on and the buttons work but it is stuck in "Self-test in progress, please wait". I contacted them again and this is what they said:QuoteBut my DPI 515's SN label was removed. I'm afraid that this may be as far as I can get, but it was fun and gratifying process.Thanks for your help.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: May 07, 2025, 05:45:20 pm
content: Hello Riq,Do you consider asking Baker-Hughes how to read both SN and how to update one of those ?

author: Riq
author_rank: Contributor
timestamp: May 07, 2025, 06:00:54 pm
content: Quote from: timeandfrequency on May 07, 2025, 05:45:20 pmI asked about how to read the SN. No reply since Friday. Will try asking again tomorrow.For the updating process, this is what I've got:Quote

author: Poroit
author_rank: Frequent Contributor
timestamp: May 08, 2025, 07:42:53 am
content: The manual I downloaded does not list all the issues that affect ;"Please WaitSelf Test in Progress"InsomeDruck Calibrators it can relate to :Hardware TestPower Supply TestSolenoid Valve TestAnd more...All need to Pass before the unit is ready for use.....Maybe it the same for your model!Check that you have all the required Power Supplies operating correctly eg 5V,12V,24V, -15V,+15V etcAre there any Comparator or Voltage Reference IC's on the Main Board?If all the voltages are healthy the Comparator outputs a healthy signal so the Self Test can move on.

author: Riq
author_rank: Contributor
timestamp: May 08, 2025, 12:53:55 pm
content: Quote from: Poroit on May 08, 2025, 07:42:53 amI think I've checked all the voltages on the PCB (24V, 15V, 12V, 5V). I'm not aware of any other voltages. I do not see any comparators on board.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: May 08, 2025, 01:56:21 pm
content: Quote from: Riq on May 07, 2025, 06:00:54 pmDo you know if this procedure updates the display board SN ? The main board SN ? Both ?Quote from: Riq on May 08, 2025, 12:53:55 pmI would guess that the comparator is inside the power supply assembly and provides a 'Power Good' signal.As long this signal is negated, the µC keeps in a reset state.This is likely not the case for your unit because boot process has started and display shows a message.

author: Riq
author_rank: Contributor
timestamp: May 08, 2025, 03:08:03 pm
content: Quote from: timeandfrequency on May 08, 2025, 01:56:21 pmI assume that this only updates the User Interface Board SN, as Druck told me to input the instrument's SN (which I do not have).

author: Riq
author_rank: Contributor
timestamp: May 12, 2025, 12:11:36 pm
content: Update:So, I got another response from Druck. They gave me a "Default Serial Number" that I can input in the menu mentioned before and the device should work. Said SN is 65795.I also got this information:QuoteAnd guess what? LED12 (Mainboard comms) is not working at all! This device sure has a lot of problems. I wonder what happened.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: May 12, 2025, 04:13:09 pm
content: Hello Riq,Quote from: Riq on May 12, 2025, 12:11:36 pmThanks for sharing the manufacturer's advice that tried to help you because of missing SN.Did you replace the cable between main and display board ? Just in case it could be defective.Check the power supplies voltage again for value and ripple.Take a few hi-res pictures of the main board.List the ICs you find on the board.

author: Poroit
author_rank: Frequent Contributor
timestamp: May 13, 2025, 06:47:11 am
content: Are the repairs shown in the attached yours or the previous owners?

author: Riq
author_rank: Contributor
timestamp: May 14, 2025, 01:57:36 pm
content: Quote from: timeandfrequency on May 12, 2025, 04:13:09 pmNo problem! The power supplies are OK. And I replaced the cable between de boards as soon as I got the instrument.Can't take pictures at the moment. Will update them when I'm able to.

author: Riq
author_rank: Contributor
timestamp: May 14, 2025, 01:59:07 pm
content: Quote from: Poroit on May 13, 2025, 06:47:11 amI asked at work. They just bought the instrument on eBay to check if they could repair it, but never did anything to it and now it's in my hands. It is safe to say that was the previous owner's work.

author: Poroit
author_rank: Frequent Contributor
timestamp: May 15, 2025, 08:41:16 am
content: It's had a hard life by the look of it.Lets see what your pics of the PCB associated with LED12 reveal to members.

author: Riq
author_rank: Contributor
timestamp: May 26, 2025, 11:59:29 am
content: Hello again. Sorry for not posting, I was a little busy.Sure, here is the section of the PCB that manages comms (as far as I know).

author: Poroit
author_rank: Frequent Contributor
timestamp: May 28, 2025, 04:21:42 am
content: LED12 is connected to PIN 44 of the Infineon C505 which is an Analog Input.I suggest do some measurements of Test Points etc around that area and forward them to the Druck Customer Care for comment.