Author Topic: WTF: Keithley 2000/2015 or Similar Main PCB (Read 1641 times)

Hugoneus · « **on:** April 12, 2026, 07:55:13 pm »

All,

I am in the process of repairing a Keithley 2510. Unfortunately, the ADC chip is dead. It is the part number "2000-802A04".

This chip is used in a few other instruments. I only need this IC. If you have a board which you want to sell, please let me know.

Thanks!

Hydron · « **Reply #1 on:** April 13, 2026, 08:29:55 am »

My cheap ($75) K2304A "High speed power supply" uses a "2000-802A02" (note 02 at the end) - not sure if that's just a revision number or if there's a functional difference, but if it's the former then there might be quite a few options out there for salvaging one beyond what you'd expect.

Hugoneus · « **Reply #2 on:** April 13, 2026, 01:30:24 pm »

Thank you. I wonder if it’s the same chip or a lower variant of it…

Kleinstein · « **Reply #3 on:** April 13, 2026, 04:50:07 pm »

The chip should be a CPLD (or similar) programmed logic chip. With the still moderate clock speed there should be no different speed grades that mater. The critical signals are resynchronized and jitter is thus not critical.
The K2000 service manual suggest this would be firmware versions.

coromonadalix · « **Reply #4 on:** April 13, 2026, 05:10:22 pm »

they where used in Keithley 6485/6487 too but a new chip seems to replace it ?

https://www.eevblog.com/forum/testgear/keithley-64856487-teardown/25/

Hugoneus · « **Reply #5 on:** April 13, 2026, 05:34:53 pm »

Quote from: Kleinstein on April 13, 2026, 04:50:07 pm

The chip should be a CPLD (or similar) programmed logic chip. With the still moderate clock speed there should be no different speed grades that mater. The critical signals are resynchronized and jitter is thus not critical.
The K2000 service manual suggest this would be firmware versions.

Thanks - what matters here is if it would work in the 2015-AT without any firmware change, since firmware change is not something that can be applied.

I also suspect that it is more than just a simple CPLD, because it would not make financial sense to create a custom IC to replace a CPLD which is easily available.

Hugoneus · « **Reply #6 on:** April 13, 2026, 05:35:54 pm »

Quote from: coromonadalix on April 13, 2026, 05:10:22 pm

they where used in Keithley 6485/6487 too but a new chip seems to replace it ?

https://www.eevblog.com/forum/testgear/keithley-64856487-teardown/25/

Even used prices for these are still way more than I paid for the broken 2015.

Hydron · « **Reply #7 on:** April 13, 2026, 07:08:24 pm »

@Hugoneus - the service manual for the K2510 (https://download.tek.com/manual/2510-902-01E_Mar2010_Service.pdf) specifies the 2000-802A02 part (as does the K2015 manual, did not check the K2000), so I suspect you can rob any number of instruments for this part. While the manuals for this era sadly don't include schematics you can normally find a parts list which should make the search much easier.

Kleinstein · « **Reply #8 on:** April 13, 2026, 08:03:11 pm »

The variants from the last digits seem to be more than just SW changes.
I found picture of a 2000-802-01, which is a EPM7160, which is larger than some other versions (e.g. A02).

Even with a custom label they could still be a preprogrammed CPLD.

coromonadalix · « **Reply #9 on:** April 13, 2026, 08:19:19 pm »

can you remove the sticker ?

photo from xdev teardown
https://xdevs.com/fix/kei2000/

read the xdev's thread

there are bins of few ic's this one too ?? 803 xxx 804 xxx are posted

and some possible ic subs't ....

good luck

Hydron · « **Reply #10 on:** April 13, 2026, 09:59:53 pm »

~~Oh that is interesting, I definitely thought it was more than just a ROM. The service manual does also imply that it's a ROM too...~~

I misread, it's 2000-802 not 803/804 like the small ROMs with stickers. Still, service manual also says ("PROGRAM") even for the smaller non-EPLD ones.

Hugoneus · « **Reply #11 on:** April 13, 2026, 10:16:40 pm »

I got a hold of the “02” part. I’ll try it and see if it works.

coromonadalix · « **Reply #12 on:** April 14, 2026, 01:15:38 am »

oh the big altera one ?

keep us informed

Hydron · « **Reply #13 on:** April 14, 2026, 08:11:04 am »

02 is a small one

coromonadalix · « **Reply #14 on:** April 14, 2026, 09:17:17 am »

2000-803-A02 and 2000-804-A02 would be plcc32 eeprom ?

2000-802-A01 would be the Altera

2000-800-A02 would be the one on the vfd board ?

or any higher rev ...

U157 U156 Uxxx (Altera) and U401 (display) or other place ...

this is a clear indication geez instead of being cryptic why not tell the Uxx location and complete description / markings

Hugoneus · « **Reply #15 on:** April 14, 2026, 02:59:18 pm »

The part which I will try on my board will be: "2000-802A02". The part which used to be on the board was "2000-802A04".

Lets see what happens.

Solarcam · « **Reply #16 on:** April 17, 2026, 11:12:46 pm »

I have for sale for $50 if you are interested let me know

Hugoneus · « **Reply #17 on:** April 19, 2026, 07:28:36 pm »

Quote from: Solarcam on April 17, 2026, 11:12:46 pm

I have for sale for $50 if you are interested let me know

Ugh - it gave me hope.

But that’s OK. Video of repair coming soon.

amc184 · « **Reply #18 on:** April 25, 2026, 05:24:03 am »

Long time subscriber, love your videos! I'm in the same position as you, with a 2015 waiting on a 2000-802A02 to continue a repair. I found a Chinese vendor advertising used pulls, but they tripled the advertised price when I tried to buy, and I decided it wasn't worth the risk. I posted about it here:
https://www.eevblog.com/forum/repair/keithley-2015-dmm-repair/

Something I found is that the 230x series of battery simulators from Keithley use a simplified version of the 2000's DAC for readback, including a 2000-802A02. I have a 2306, which actually has two, one for readback on each channel, but I wasn't prepared to sacrifice it for the 2015. There are sometimes cheap 2304As on eBay (with one 2000-802A02), that's my long term plan.

gamalot · « **Reply #19 on:** April 25, 2026, 08:00:22 am »

It is 2000-802A02 in my one.

Hugoneus · « **Reply #20 on:** May 10, 2026, 04:32:52 am »

Here is the result!

You can watch the video here: [32 Minutes]
youtu.be/Pb59zb5wWOc

A Fancy PID Controller: Keithley 2510 TEC Source-Meter Teardown, Repair & Experiments

* SPOILER *

In this episode Shahriar attempts the repair of a Keithley 2510 TEC Source-Meter. This instrument is capable of delivering up to 60W of power to any TEC in both polarities. Furthermore, the instrument integrates a flexible temperature read-out capability with 4-wire interface. Lastly, combining both capabilities, alongside a fully customizable PID controller, a precise temperature controller can be realized.

This particular unit returns erroneous readouts in all modes: voltage, current, resistance & temperature. The unit is also generating "squeaky" noises which is indicative of a failing DC-DC converter. The block diagram of the unit is examined and the fault is ultimately traced to a damaged opto-isolator in the isolated switching power supply. Several other components are also faulty which are located via thermal camera. The output Class-D / buck converter circuit & block diagram are also examined in details.

Unfortunately, the custom IC at the heart of the multi-slope ADC is also damaged. The IC is de-capped, examined under a microscope, and compared with its predecessor CPLD counterpart. This Keithley component is sourced from an older high-speed power supply. The correct readout is then verified. Several experiments are demonstrated using the PID controller and a custom TEC setup.

Smokey · « **Reply #21 on:** May 11, 2026, 06:11:09 am »

I'm waiting for the Keithley 2303 Ebay listing..

"For parts or repair. May or may not be missing 2000-802A02"


EEVblog® Main Site	EEVblog® on Youtube	EEVblog® on Twitter	EEVblog® on Facebook	EEVblog® on Odysee

Author Topic: WTF: Keithley 2000/2015 or Similar Main PCB (Read 1641 times)

Share me