Boss CE-1 (original Chorus Ensamble) Repair/Mod

[D-Teknikk]

A friend of mine is having trouble with a Boss CE-1 which he wants to use with electric bass. I will be able to take a look at it in a couple of days.

Ok, so.
As he described: The signal is certainly not altered, but passes through. It hisses on normal, but not on effect (though louder). It has been tried with a booster pre-chained, and with synth. Same thing, only the LED over normal/effect switch lights up and some slight clipping occurs.
After reading other posts on the CE-1 I suppose the trimpot at the base of Q7 could need adjustment.

Until I get to check it out,
Any tips or ideas are much appreciated
(as preferably it needs to be fixed within a week)

Thanks
Tommi

[D-Teknikk]

Seems like the JFET gates at the outputs doesn't get the right control voltages (used as signal switches).

This is what I measured at the gates of
Q11: -0V
Q12: -0.55V
Q13: -3.17V
(these were all 2SK30A Y)

On normal its OK. On effect the signal is still clean (slight clipping).
None of chorus/vibrato makes any difference. Still clean signal only.