[sdiy] Juno 106 repair question (beyond simply replacing 80017a/5534a)

[Jim Coursey]

Hi, I posted this on Muff's but have yet to get any advice.  

I'm trying to troubleshoot a pair of voices on my Juno 106 with no Pulse output. The saw on voices 1 and 2 work fine, the square just makes a click. Because the same issue appears on both, the VCFs/VCAs work fine on the voices, I take this to be a problem with the 5534a which produces both voices 1 and 2. (After all the outputs of 5534a pins 14 and 16 are the sums of PWM and saw, the latter of which comes through fine.) 

Both 80017a's had been replaced with clones and seem to work fine now. (I really bungled the replacement of one but think I repaired the traces etc sufficiently and again, it works fine.) I tried replacing the 5534a with a replacement from a reputable source (Synth Parts) but the result is the same. 

What next? I've attached the relevant portions of the schematic at Muff's (see link below). I can verify that pin 12 of all 5534a's (PWM CV) is getting signal. I see no specific PWM control (on/off etc) otherwise.    

http://www.muffwiggler.com/forum/viewtopic.php?t=59686

-Jim