Needing some help. I recently purchased a Gorgar and it has no sound (no hum or anything). Things I have done so far:
1. All fuses checked and okay.
2. Checked pot in cabinet and is good.
3. Checked speaker and wire to sound board - okay.
4. Diagnostic switch on sound board pressed and no sound.
5. Checked voltage input from transformer. 9.4 v at outer pins (1 and 9)and no voltage at center (pin 5). (? potential issue). What to do?
6. Checked voltages at TP's. TP1 is 10.9 v (supposed to be 12v), TP2 is -12.4 v, and TP4 is 4.9v. With TP1 being 10.9, could this be the problem? What is the fix?
7. I have also taken the sound board loose (while the game is on and functioning) and put my finger on the back of IC1. No hum created.
I am out of ideas and hope some of the experts will chime in. Thanks in advance.

Sound issue resolved... on to other challenges.

Follow-up. After all the work I did checking the boards etc... I went back again to check the basic things such as the POT, connectors, ... I realized that when I checked the speaker, I checked it before unplugging it in the back box at J3 (I think, going off memory - two black wires connected to the sound board). Leaving it connected, I received a resistance reading and moved on initially. After rethinking (and hours later), I went back and unplugged the speaker and checked the resistance. BINGO!! No resistance which means the speaker was completely shot and not even making a hum. Replaced the speaker and the sound is perfect. A true oversight / mistake. Hope this helps.