Electronics > Repair

BK Precision 9130 Triple Power Supply repair.

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jchw4:

--- Quote from: Kean on October 26, 2021, 02:27:09 am ---Thanks for all the research into the fan control jchw4.  I'll try a similar mod on the fan temperature control.

Apart from this PSU being a pain to work from, the big problem people seem to have with it is the caps prematurely failing - presumably a factor of poor cooling.
Now I just need to work out why I now get mixed readout between channels on mine  |O

--- End quote ---

I cannot promice to make a schematics of it, but it is connected like this:

ADC 2U5, 2U6, 2U7 are connected to the main IC 2U14. They share the same serial bus.

ADC pins are connected like this:
(5) - Serial clock in (shared)   
(6) - Serial data out (shared)
(7) - ~CS (not shared)
(19) - ~RESET (shared)
(20) - ~INTERRUPT out (shared)
(23) - Serial data in (shared)

2U13 controls communications with all MSP430 and RS232 TX.
2U14 controls communications with ADCs.

So in your case something could be broken in these CS lines.

I did not trace it too far (as this part works for me), but I hope my tracing image will help you.

Kean:

--- Quote from: jchw4 on October 26, 2021, 05:39:13 am ---So in your case something could be broken in these CS lines.

I did not trace it too far (as this part works for me), but I hope my tracing image will help you.

--- End quote ---

Yes, maybe a damaged CS signal for channel 2.  Great suggestion!  I hadn't really studied how it was all connected, so that info is much appreciated.

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