PV XR684. 400SC power module

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Groovtubin
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Joined: Thu Sep 21, 2017 12:40 pm

PV XR684. 400SC power module

Post by Groovtubin » Thu Sep 21, 2017 12:47 pm

Hi all, im new to forum, but have in pass worked on alot of PV gear!

Aubrey sent me the schematic for this module, my prob is the J111`s. Are ( maybe!) killling signal to the r n l PA in opamps.i CUT the JFET J111`s OUT, amp works fine, the schematic shows 2 X 6534`s creating the bias for the gates on Jfets, i DONT hv a nomenclatue pic so im ruffin it, Tracing out bkwards, im showing 2 x SP 7239s. Controlling the jfet gate vs the 6534s...AUbrey hasnt re-contacted me yet, so i thought id throw this out there for anyone who can help me! Thanks in advance, i did try the left side 73080 for kiks, no joy....no smoke, nor heating up...

jim h
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Joined: Fri Sep 12, 2008 11:20 pm

Re: PV XR684. 400SC power module

Post by jim h » Thu Sep 21, 2017 1:17 pm

It will work without the J111's, if you can live with the turn on/off pop.

If you still want the muting to work, then I would make a couple of small changes to the circuit.

First, change R275 from a 1Meg ohm resistor to a 100k ohm resistor. Then, change C244 from a 2.2uF to a 22uF cap.


This won't help if there's a damaged part, but it will work better under normal circumstances.

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