I have this amp in for repair and its not producing rail voltage.
Theese are the voltages i have
FMG22s
1:8.79
2:8.30
3:8.79
FMG22r
1:8.79
2:1.54
3:8.79
Outputs
D2438
1:1.58
2:8.30
3:1.15
B1587
1:1.58
2:1.54
3:1.15
Where do i begin to check?? Any help would greatly be appericated
Theese are the voltages i have
FMG22s
1:8.79
2:8.30
3:8.79
FMG22r
1:8.79
2:1.54
3:8.79
Outputs
D2438
1:1.58
2:8.30
3:1.15
B1587
1:1.58
2:1.54
3:1.15
Where do i begin to check?? Any help would greatly be appericated
10uS and 5v/div.
Do you have a square wave on pins 9 and 10?
If not, post the DC voltage on the 494.
Do you have a square wave on pins 9 and 10?
If not, post the DC voltage on the 494.
I have nice square waves on pins 9 and 10 also have nice square waves on the gate legs of the fets
With the scope set to 10v/div, do you have a square wave that swings ~2.5 divisions on the center leg of each of the power supply FETs.
Ok fixed that problem I have theese voltages on the ps fets
1:0.36
2:13.89
3:0
It produces rail voltage + - 27 volts on the outputs and + - 15 volts on the op-amps but no output still
1:0.36
2:13.89
3:0
It produces rail voltage + - 27 volts on the outputs and + - 15 volts on the op-amps but no output still
Pots and switches all positions?
If you still have no signal, rrive a strong signal into it and look for signal on pins 1 and 7 of IC101. Scope set to 0.5v and 2mS.
If you still have no signal, rrive a strong signal into it and look for signal on pins 1 and 7 of IC101. Scope set to 0.5v and 2mS.
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