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Keithley 2306 Dual Battery Simulator Repair (maybe)

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Smokey:
I just scored a battery simulator from the ebays.  Advertised as "powers up, no display".
https://www.tek.com/en/products/keithley/dc-power-supplies/2300-series

https://download.tek.com/manual/2306-901-01%20(F%20-%20Apr%202008)(Ins).pdf

Dave did a teardown of the one channel model here: https://www.eevblog.com/forum/blog/eevblog-1005-keithley-2302-battery-simulator-teardown/

I don't think there is a repair manual available.

Got it on the bench and turned it on.  The fan comes on, and as described there is nothing on the screen.  The corner of the VFD looks like it arc'd inside.  That may be the only issue, but I'm still waiting for the GPIB adapter to ship so I decided to poke around inside and see what I can see.

(The lighting in the pictures I took sucked, so I'm using screen shots from Dave's teardown)



There are some test points for the output voltages of the transformer. 
+/-15V, +/-5V, +25V

The +/-15V and the +5V are regulated, and measure good. 

The -5V and +25V both appear to be unregulated and measure high:
+25V Testpoint measures +40V
-5V Testpoint measures -9V

The transformer primary is a regulated 12V chopped into a 60kHz square wave by those two devices on the left of the transformer.  There are +/-40V, +/-25, and +/-9V square wave secondaries.



The strange thing in this case is that there are two nearly identical channels (both populated on the 2306 model I have here) and BOTH of them measure the same high voltages for the +25V and -5V rails. 

Does this make any sense?  I don't see anything obviously wrong with the diodes or caps doing the unregulated filtering.  Since both channels are acting identically, I would be surprised if there was a transformer drive or secondary issue. 

If these rails are supposed to be +40V and -9V, why label the test points +25V and -5V?

edpalmer42:
I can't find a service manual, but here's a 367 page Instruction Manual that includes parts lists, component placement drawings aaannnndddd no schematics.   :palm:

https://images-na.ssl-images-amazon.com/images/I/B1fzKhl8h3S.pdf

Also, lots of info & documents here for you to wade through.  There's bound to be some treasures.

http://electronicsandbooks.com/edt/manual/index.php?dir=Hardware/K/Keithley+www.keithley.com/

Ed

Smokey:
Ya, I've done a bit of digging and I haven't heard anyone talk about those voltages.  I know there is another repair thread with a different problem here: https://www.eevblog.com/forum/repair/keithley-2306-dual-psu-battery-simulator-repair/

So there are a few people with these simulators.  I would have thought someone would have measured the +25V test point and said something about that voltage being +40V if it was supposed to be like that. 

Smokey:
Sunday afternoon Keithley bump....

picburner:
I am one of those who wrote in the other tread.
I still have the K2306 and should do some maintenance on it.
If you have patience, as soon as I can, I open it and take the measurements in the points indicated.

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