Ok replaced the caps,gte resistors,drivers,power supply fets..
Amp will not power up..
Heres what i get on the 494
Pin 1:0.00
Pin 2:4.75
Pin 3:0.06
Pin 4:1..15
Pin 5:1.50
Pin 6:3.34
Pin 7:0.00
Pin 8:0.64
Pin 9:0.00
Pin 10:0.00
Pin 11:1.11
Pin 12:13.26
Pin 13:4.95
Pin 14:4.95
Pin 15:4.95
Pin 16:0.00
Any ideas??
Amp will not power up..
Heres what i get on the 494
Pin 1:0.00
Pin 2:4.75
Pin 3:0.06
Pin 4:1..15
Pin 5:1.50
Pin 6:3.34
Pin 7:0.00
Pin 8:0.64
Pin 9:0.00
Pin 10:0.00
Pin 11:1.11
Pin 12:13.26
Pin 13:4.95
Pin 14:4.95
Pin 15:4.95
Pin 16:0.00
Any ideas??
No
R625,R626 burn up ..
Q625,Q626 A56's have been replaced also and are defective also..
Someone has been inside this amp before..
Do you happen to have a pic of the area around the 494 and right behind it all thoose transistors have been messed with and dont look right to me
R625,R626 burn up ..
Q625,Q626 A56's have been replaced also and are defective also..
Someone has been inside this amp before..
Do you happen to have a pic of the area around the 494 and right behind it all thoose transistors have been messed with and dont look right to me
See attached.
If you don't find any other faults, replace the A56s and resistors, remove the driver transformer and connect a 1k ohm resistor from the center tap of it to each of the outer windings (all of this on the side of the transformer connected to the A56s).
To make sure that the power supply FETs remain off, connect 1k resistors to the other side of the driver transformer as well (same configuration).
Do you see a drive signal on the outer legs of the driver transformer connected to the A56s?
If you don't find any other faults, replace the A56s and resistors, remove the driver transformer and connect a 1k ohm resistor from the center tap of it to each of the outer windings (all of this on the side of the transformer connected to the A56s).
To make sure that the power supply FETs remain off, connect 1k resistors to the other side of the driver transformer as well (same configuration).
Do you see a drive signal on the outer legs of the driver transformer connected to the A56s?
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