Yamaha P2250 PA(A) Protection Issue

[Adeel Mughal]

I have an old Yamaha P2250 having protection issue, after long troubleshooting, I found that there are DC voltages coming out from PA(A) output TP205

Base +/- 23 vDC and Emmitor +/- 23 vDC

Protection mode turned off when I disconnect +/- 15v that power up OP AMP or remove output jack from output board.

I don't understand what is the issue, can anyone please advise where should I look?

I have attached the service manual image of PA(A)

On RED It sensed 1.9 Voltages, protection mode turned off if I removed, Yellow Jack or the Green

 

[Adeel Mughal]

I got results here

1. TP201 = 0v,
2. TP202 = 0v,
3. TP205 = 3v Neg,
4. TP206 = 0.001v,
5. TP203 = 3v Neg,
6. TP204 = 3v Neg,
7. IC201 = 9v Neg at Pin 1,
8. All output transistors BASE and Emmitor showing 3v Neg and Collector showing +/- 61v
9. When I disconnect +/-15v Jack that power up OP AMP, DCO removes from output TP205, 206

 

[exwhyzed]

There could be a NEC 7815 and 7915 IC somewhere...providing the +15V and -15V. Perhaps take a look at those and see if they are outputting the correct +15V and negative 15V.

EDIT: If they are in fact working correctly, then perhaps it could be one of the OP amps not working correctly.