Testing unit repair possibilities?

[William D]

Here I have a machine for testing quartz watches. It's 18 years old and the manufacturer no longer services it.
As you can see I get a consumption reading even though there is nothing connected it goes up as the voltage is turned up as would be expected. It does this in both ranges. and intermittently shows resistance when it should be an open circuit in the resistance mode.
What are my chances of tracking down the source of this problem, or as I expect am way over my head. alternatively, are there independant shops that could repair something like this? As I said the company will no longer service this machine. But I like it so much better than the new ones that try to come up with settings automatically. I much prefer to choose my own.
Thanks for any suggestions.

 

[Ian Rogers]

I repair old spectrum computers that are 20+ years old.... Almost all have capacitor issues.. All the electrolyte caps have gone high ESR... I buy good quality caps and replace the lot... Even the small ones.... I repair different models BBCB Tandy etc... All the same..

 

[KeepItSimpleStupid]

manufacturer's datasheet: https://www.witschi.com/assets/files/sheets/Leaflet_qt6000.pdf


Usually the first thing is to check the power supply and ripple. I agree with capacitor issues.

There is a 15 and a 5V supply easily identified. If there is a negative supply for the OP amps, that can be a cause for considerable grief..`

One other potential problem is the EPROM (the thing with the red tape on it. https://en.wikipedia.org/wiki/EPROM It could be taken out, and read a few times and each read compared and another re-programmed.

There are 3 very high reliability sealed relays on the board (M4-5H). They are a possiility.

Re-seating the cables is another thing that can be done.

i doubt you would be able to get anything from the manufacturer.

It's not a board that you would want to desolder anything without a professional tool.

Buy one: https://watchtester.sell.everychina...atch-analyzer-q-test-6000-for-watchmaker.html

**broken link removed**
does service repair and calibration