14
A
Do channels
save correctly?
N
1. Check CAS-220
2. Check connect circuit between tuner and CAS-220
3. Check control circuit between main chip (ZR39660) and
CAS-220
Can you change
SRS mode?
N
NOTE: Some Inputs don
t support SRS mode
1. Check AP8206AA chip
2. Check control circuit between main chip and AP8206
Can you change
sources?
1. Check video and audio switch chip (FASV330/331, CD4052)
and relevant circuit
2. Check control circuit between main chip and switch chip
N
Does the
display look
correct?
N
1. Check filter circuit after input jacks or tuner
2. For Y/C, RGB, Y/Pb/Pr input:
Check the circuit between MST9883 and switch chip
Check the circuit between MST9883 and main chip
3. For tuner and CVBS input:
Check the circuit between switch chip and main
chip, check chip FM6408 function works correctly
Is the sound
correct?
Have you
checked all
sources?
1. Check filter circuit after input jacks or tuner
2. Check the circuit between the switch chip (CD4052) and
SRS chip
3. Check the AMP functionality
N
N
Does AV output
work correctly?
1. Check FM6413 and relevant circuit
2. Check the CVBS output jack
N
FINISH
