Zapco

[Method21]

Hi, I was wondering if anyone has any of the old zapco reference series schematics?

 

[Perry Babin]

I have some Zapco but nothing is labeled as reference. Photo of the board?

Do you need help with a repair or do you simply want a diagram?

 

[Method21]

Ag series is the reference series at least the AG1000 matches my 1000 reference. I have been working on a few zapcos of my own… I have tested all fets and caps. I need schematics so I can check all the resistors to see if they are to spec. Basically I have an issue on 2 of my old amps, they can take power with no problems but they won’t turn on. My guess is it’s a resistor or something like that. I have been looking for broken traces and don’t see anything.

 

[Perry Babin]

I checked my email first and answered there but do it here instead, in the future.

 

[Method21]

Will do, thanks.

 

[Method21]

He’s a pic of the zapco 350.2 board. Can put 12v to it, but nothing happens.

 

[Perry Babin]

Answering email here.

Start with the voltages on the various ICs on the primary side of the power supply. VCMOS would be the first test point.

 

[Method21]

Am I to do this with voltage on the board?

 

[Perry Babin]

When the amp isn't drawing excessive current and isn't powering up, you check voltages with B+ ground and remote connected.

 

[Method21]

I will check em out tomorrow I’m at work now. Thanks for the info!