Apple Mac 5260/100 - Manual (Page 51)

Troubleshooting Symptom Charts/Audio - 6
Audio
Distorted or garbled
sound from both
speakers
Replace analog/video board assembly.
Distorted or garbled
sound from one
speaker
1 Replace defective speaker.
2 Replace analog/video board assembly.
Sound distortion
with MPEG board
installed
Replace MPEG board with modified MPEG board. A modified
board should have a jumper present from U5 Pin 2 to D1 Pin 1.
No sound output from
speakers
1 Check sound source.
2 Check that speaker cable at connector P601 on analog board
is plugged in and not defective.
3 Reseat drive bezel and front-panel control board.