Polaroid FXM-3211C, FXX-321C service manual Finish

N

A

Do channels

save correctly?

Y

Can you change

sources?

Y

Can you change

SRS mode?

Y

Does the

display look

correct?

Y

Is the sound

correct?

Y

Have you

checked all

sources?

Y

Does AV output work correctly?

Y

FINISH

N

N

N

N

N

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

1.Check video and audio switch chip (FASV330/331, CD4052) and relevant circuit

2.Check control circuit between main chip and switch chip

NOTE: Some Inputs don’t support SRS mode

1.Check AP8206AA chip

2.Check control circuit between main chip and AP8206

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

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

1.Check FM6413 and relevant circuit

2.Check the CVBS output jack

14