Samsung PCL545RX/XAA Service Manual page 60

Troubleshooting
5-2 No Sound
5-2
Check if CN601
is inserted
normal
Check IC665
output pins 2, 4
Abnormal
Check IC665
input pin 5
normal
Check IC665
Mute pin 5
normal
Check IC665
output pins 7, 11
Abnormal
Check IC601
input pins 35, 38
Abnormal
Check CNS01
input pins 5, 9
Abnormal
Check IC703
input pins
Abnormal
Check CNS01
output pins 28
Abnormal
Insert CN601
(Connector)
normal
Check Speaker
Abnormal
Check FD854S on
the Power Board
Abnormal
Check the Mute circuit
normal
Check the Control
normal
Check the Control
normal
Check the Sound Module
circuit
normal
Check IC703
Samsung Electronics