Ok out of the amp this is the readings i get on the regulators
7905
1-2:0.548
1-3:0.704
2-3:OL
Probes reversed
1-2:OL
1-3:1.120
2-3:0.551
7805
1-2:0.550
1-3:0.577
2-3:0.914
Probes reversed
1-2:OL
1-3:OL
2-3:0.606
7815
1-2:0.556
1-3:0.570
2-3:OL
probes reversed
1-2:OL
1-3:OL
2-3:0.617
7915
1-2:0.539
1-3:0.716
2-3:OL
Probes reversed
1-2:OL
1-3:OL
2-3:0.532
Do any of theese so far appear to be defective?
7905
1-2:0.548
1-3:0.704
2-3:OL
Probes reversed
1-2:OL
1-3:1.120
2-3:0.551
7805
1-2:0.550
1-3:0.577
2-3:0.914
Probes reversed
1-2:OL
1-3:OL
2-3:0.606
7815
1-2:0.556
1-3:0.570
2-3:OL
probes reversed
1-2:OL
1-3:OL
2-3:0.617
7915
1-2:0.539
1-3:0.716
2-3:OL
Probes reversed
1-2:OL
1-3:OL
2-3:0.532
Do any of theese so far appear to be defective?
I don't think you can determine much this way unless they're shorted or leaking badly.
What's the circuit board designation of the 7915 you originally measured the voltage on?
What's the circuit board designation of the 7915 you originally measured the voltage on?
U10
I have to do some checking into this amp now . Now the power light doesnt light up but relays kick on same problem as the other amp i worked on.
I have to do some checking into this amp now . Now the power light doesnt light up but relays kick on same problem as the other amp i worked on.
When you finish, if you haven't found the problem, find D26-D29, L11 and L12. Do you have DC voltage on both ends of L12?
L12 1 side:-9.69 other side:8.78
L11 1 side:27.42 other side:8.86
D26 1 side:8.84 other side :27.14 directly across it:18.50
D29 1 side:8.70 other side-9.54 directly across 18.35
Power light still doesnt come on so i have to track it down still
L11 1 side:27.42 other side:8.86
D26 1 side:8.84 other side :27.14 directly across it:18.50
D29 1 side:8.70 other side-9.54 directly across 18.35
Power light still doesnt come on so i have to track it down still
L12 is definitely defective. The other one is likely defective also. I think they should have no more than a few ohms resistance.
Compare them to L10 and L13.
Compare them to L10 and L13.
Replaced L11 and L12 amps power light is back on. I still have pulsing voltages from every pin in the middle row of the driver board
Did you check each regulator individually? Are all of them producing the correct regulated voltage?
7915
Leg2:-13.89 and is pulsing
Leg3: 13.22 and pulsing down to the 12's
7815
Lge1:12.67 and pulsing all over
Leg3:13.68 and pulsing all over
7905
Leg2 -13.88 and pulsing
Leg3: -490 and pulsing
7805
leg1:12.66 and pulsing
Leg3:5.03
Leg2:-13.89 and is pulsing
Leg3: 13.22 and pulsing down to the 12's
7815
Lge1:12.67 and pulsing all over
Leg3:13.68 and pulsing all over
7905
Leg2 -13.88 and pulsing
Leg3: -490 and pulsing
7805
leg1:12.66 and pulsing
Leg3:5.03
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