High current supply +ve = Collector of OP transistors TR1, TR2, TR5, TR6, TR9, or TR10 - to ground
Right channel (the one that doesn’t get the amp into protection)
Tr01 e-9.2v b-8.6v c-9v
Tr05 e-67v b-66.4v c-67v
Tr06 e-65.4v b-65v c can’t measure (sleeving)
Tr09 e-66.4v b-67v c-67v
Tr10 e-65v b-64.6v c+67v
Tr11 e-66v b-66v c-67v
Never seen so many Negative readings
High current supply -ve = Collector of OP transistors TR3, TR4, TR7, TR8, TR11, or TR12 - to ground
Tr03 b-9v e-8.54v c-8.5v
Tr04 b-8.5v e-8v c-64v
Tr07 b-65v e-65v c-67v
Tr08 b-64v e-64.6v c+67v
Tr11 b-66.6v e-66 c-67v
Tr12 doesn’t exist .
Low current supply to driver board +ve = on F2507 - junction of R04 (33K) & R12 (330Ω) - to ground. (and the same on the other driver board).
Right board -5.5v
Low current supply to driver board -ve = on F2507 - junction of R06 (10K) & R11 (330Ω) - to ground. (and the same on the other driver board).
R06 -70v & -23.1v
R11 -70v & -68v
DC offset = measure on each F2507 at the junction of R33 & R34 (both 47Ω) - to ground.
Right board -65v
I checked the right channel only because I must remove it to get a safe access to the other board. Please let me know if you want me to make more readings on the right board before I remove it and what do you think so far?
Thanks