Pioneer GM7300M

[mike49504]

Amp powers up and produces + - rail voltages and + - 15 volts of regulated voltage..

I cleaned the Switch But still no output..


Any ideas?

 

[Perry Babin]

Do you have audio on pins 1 and 7 of IC191?

 

[mike49504]

No

 

[Perry Babin]

List the op-amps that do have audio on pins 1 and 7.

 

[mike49504]

I only get audio on Pin 1 of IC112


All other op-amps i get nothing on pins 1 and 7

 

[Perry Babin]

Do you have audio on both legs of R111 and R112?

 

[mike49504]

I didnt notice it til now theres a crack in the board and atleast 5 traces are not making contact..


I will repair all traces and the get back to you..

 

[mike49504]

Ok I have Audio On the following IC's


IC111 Audio on pins 1 and 7

IC112 Audio on pin 1 only

All other op-amps no audio..


R111 audio on both sides

R112 Audio on both sides

 

[Perry Babin]

Look for another break between pin 1, R133 and pin 5.

 

[mike49504]

Do you have a pic of that area around R133 ?


The board is cracked and i cant locate R133

 

[Perry Babin]

This is the best I can do. It's from the 7200 which is supposed to be about the same. It's a 10k resistor if it's missing.

 

[mike49504]

On this amp The board is marked R133 but it doesnt look like a resistor goes there its just a solid trace..

Not sure if its suppose to be there but R131 is missing

 

[Perry Babin]

I sent you the service manual.

 

[eroc1313]

I have a gm7200m im working on. i dont have power anywhere but the fuses. i checked d665 and no voltage present at all on both leads . The unit is dead. Could someone point me in the right direction. I bought Perrys dvd but havent looked at it very much due to time.

 

[Perry Babin]

Copy and paste this into a new thread and I'll try to help.