LG MCV903 Service Manual page 32

12. MIC PART CHECK
MIC PART
YES
Apply JK302, JK303
and check. CN301
2PIN, 4PIN output
YES
Check the P312
2PIN. 4PIN input
YES
Check the IC304
(BA3308) 8 PIN input
YES
Check the
NO
IC304 (BA3308) 3PIN
output
YES
Check the P306 15PIN output
(FRONT PCB Ass`y)
YES
Check the P7302 15PIN
input (MAIN PCB Ass`y)
YES
Check the input at both
terminals of R804,812
YES
Check the IC603
1, 2PIN input
YES
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Only for training and service purposes
NO
Check
IC304 6PIN 12V
YES
OK
3-11
Check the power at
both terminals ofFB301
LGE Internal Use Only