[sdiy] Internal clock issue (Roland)

[Nicholas Keller]

Apologies for the cloak and dagger, but I was afraid to mention SH-101 in the subject line...

My friend has an SH-101 which stopped responding to the internal clock.  Arp, seq, random generator ... None work from internal clock.  All work from external clock.   

He has taken it to a tech but reports that they seem stumped about the clock.   

Has anyone here fixed a similar issue?  After looking at the schematics, and while I admit I am no expert, I think that if it works via external clock, the CPU must be working.  I question transistor TR8, but again, I'm just following the signal path and don't fully understand the circuit.  Seems to me that the LFO generates the clock and TR8 is one of the only parts between the Clock source and the CPU. 

Any help or suggestions are appreciated, and your patience too as I don't have the synth here.  

Nick