Sony XM-D1000P5

[mike49504]

C4370 in 1 direction: OL on legs 1-2 1-3 2-3

Other direction

legs1-2:25.72
legs1-3:17.47
legs2-3:OL

C4370 1 direction Ol on legs 1-2 1-3 2-3

other direction

legs1-2:16.08
legs1-3:18.74
legs2-3:OL

A1659 1 direction On all legs OL
other direction
legs1-2:15.85
legs1-3:17.10
legs2-3:Ol

A1659 1 dirction OL on all legs

other direction
legs1-2:14.78
legs1-3:18.19
legs2-3:OL

 

[Perry Babin]

The do appear to be OK.

Did you go back and measure the voltage on the rectifiers? I don't think there's a problem but if you want to confirm that you have voltage on them, it won't do any harm. Measure the voltage on both the positive and negative rectifiers.

 

[mike49504]

negative rectifier
Leg1:-1.1
Leg2:-81.9
leg3:-1.1

Positive rectifier

leg1:-1.1
leg2:95.5
leg3:-1.1

 

[Perry Babin]

That looks OK. I'd expect them to be a bit closer but that's not likely to indicate that there's a problem.

Remove Q20, 21, 22 and 31 and check them.

 

[mike49504]

Q20
legs1-2:OL
legs1-3:OL
leg2-3:15.30

Legs1-2:25.20
legs1-3:OL
Legs2-3:OL

Q21
Legs1-2:5.90
Legs1-3:5.96
Legs2-3:OL

legs1-2:OL
Legs1-3:OL
Legs2-3:OL

Q22
Legs1-2:OL
Legs1-3:OL
Legs2-3:27.88

Legs1-2:30.30
Legs1-3:OL
Leg2-3:OL

Q31
Legs1-2:OL
Leg1-3:OL
Legs2-3:30.03

Legs1-2:31.71
Leg1-3:OL
Legs2-3:OL

 

[Perry Babin]

Those also look OK.

Pull ALL of the output transistors and check them for leakage from the gate to the other legs (meter on ohms).

 

[mike49504]

I tested all of the outputs and got pretty much the same readings off all of them

Legs1-2:OL
Legs1-3:OL
Legs2-3:9.85

Legs1-2:OL
Legs1-3:OL
Legs2-3:OL

 

[Perry Babin]

OL on 1-2 and 1-3 was what I was looking for. It appears that they're OK.

Does the output filter inductor show any signs of overheating?

 

[mike49504]

Ok i have this amp up and running again The problem was 1 of the 1K resistors board location R116 was out of tolerance. THanks Perry for your help with this amp