Eclipse 3241

[Perry Babin]

Double-check all of the op-amps for the rear channels to confirm that you have both positive and negative 15v (approximately) on the power supply pins.

 

[RiLoWa]

I tried that yesterday, but while the amp was cycling it was not a stable voltage on either the V+ or V- on any of the op amps.

Here is what I have;
Right Rear Pin #7 (V+) -3.311V
Right Rear Pin #4 (V-) -14.49V
Left Rear Pin #7 (V+) -3.311V
Left Rear Pin #4 (V-) -14.49V
Right Front Pin #7 (V+) 14.76V
Right Front Pin #4 (V-) -14.41V
Left Front Pin #7 (V+) 14.76V
Left Front Pin #4 (V-) -14.41V

Front OP amps look good, but the rear op amps have reversed from several days ago when I had good positive voltage on pin #7 and low positive voltage on Pin #4.

 

[Perry Babin]

You need to determine why you have -3.3v instead of +14.8 on the +v pins. Follow the circuit back to the regulator transistor.

 

[RiLoWa]

I think one of the new CD marked transistors I installed for the rear channels was defective. I replaced it with another one and the amp is up and running all four channels.
Thank you for all of the help Perry, you have helped me restore a darn good sounding amp.

I still have the induced noise when the low pass crossover is enabled and I touch the adjustment.

 

[Perry Babin]

If the amp works properly except when you touch the pot/switch, it may not be worth troubleshooting. If you want to troubleshoot it, you would need to see precisely what's causing it. If you touch or push on it with a non-conductive probe (wood, fiberglass...) does it produce the noise? If it only does it when you touch it with your finger, you may have an open trace or a missing ground strap between the heatsink and the board.

 

[patrick3178]

I have a eclipse 3241 and the outputs are good and so is the power supply, the power light comes on and off, could something in the protection circuit be wrong!