850 Series Power Supply question

[SeldomSeenTrev]

I've just recapped the 850 PSU for my Amek Big 28. While I was in there, I noticed some resistors attached to the J6 connection. It looks like an add on. It's overheated and the cable, resistors and connection are quite corroded. I'll cut the cable back a bit, and get some new resistors and reconnect but can anyone tell me what these are ? Why have they been added ? Also the colouring on the resistors is gone, so I'm not sure what values they are. Any suggestions ? Images are attached.

Another thing is I measured the voltages coming out of the PSU with the desk attached.
It's reading
-17.2v
+17.7v
5.5v
40.9v

Am I good to just trim these up to what they should be with the VR's on the board ? They're all pretty close but that 48v line reading 40.9v seems quite low.

Thanks

[SeldomSeenTrev]

So I ended up tweaking the voltages inside the PSU.

I'm now reading + and - 17.5 exactly, +5.1v but my 48v line is still +40.9 and the VR is all the up.

Any one have any ideas why that is, and again any ideas what those resistors are for in my previous post ?

Many thanks...

[AnalogStudio7]

I don't have an answer for your. But the AMEK power supply gurus in the USA is GRS.

Give them a shout for some help. info@grssystems.com www.grssystems.com

I'm sure they can help you out.

Cheers, Greg

[burtoni]

i think those resistors may be dropping your extra volts. Definitely someone has modded for some reason.. also removed the fuse next to it.