Before you go much further,,Un solder *C26* (1uF /100V) It hangs off pin 14 of IC1d. That will totally cut the reverb return from the audio path. if the amp then works ok,, replace IC1. ( I still have a strong feeling it's the reverb circuit.)
Next find ZD1 and ZD2 (top left corner page 2) Establish the voltage between ground and the +/- supply rails for the preamp. (they should read close to 15+ 15-)
Now follow all the rails around the board not all are the same pinouts, most of the power pins are noted on the schematic. The idea is to make sure power is getting to all the opamps.
(Note the chorus has a seperate positive supply)
If no luck then pull *Con 1*
which should isolate the power amps from *ALL* the preamp circuits.
Inserting some kind of line audio (CD line out or similar source) onto pins 3 and 5 should give the poweramps full power. (pin 4 is common /ground for both amps)
That will establish that the power stages are ok.
(Don't short out pins 1 and 2)
Bear in mind that the schematic is a different model so it may not be exactly the same,, use your head.
Phil.
Next find ZD1 and ZD2 (top left corner page 2) Establish the voltage between ground and the +/- supply rails for the preamp. (they should read close to 15+ 15-)
Now follow all the rails around the board not all are the same pinouts, most of the power pins are noted on the schematic. The idea is to make sure power is getting to all the opamps.
(Note the chorus has a seperate positive supply)
If no luck then pull *Con 1*
which should isolate the power amps from *ALL* the preamp circuits.
Inserting some kind of line audio (CD line out or similar source) onto pins 3 and 5 should give the poweramps full power. (pin 4 is common /ground for both amps)
That will establish that the power stages are ok.
(Don't short out pins 1 and 2)
Bear in mind that the schematic is a different model so it may not be exactly the same,, use your head.
Phil.