LG LPC-LM530A Manual page 7

• OPEN COLOSE NG
CONNECTOR LOCKING CHECK (PN508,PN507)
YES
CHECK POWER SUPPLY CIRCUIT (PN508,PN507)
PN508 PIN 8 = 6.2V,PIN 7 = 5V,PN507 PIN 1 = 5V
YES
CHECK VOLTAGE CHANGE OF OPEN CLOSE,
AND BTLMUTE VOLTAGE(=5V)
(PN507 PIN 1 2:OPEN, 1 3:CLOSE, 1 4:BTLMUTE)
YES
CHECK VOLTAGE CHANGE LO+, LO- OF IC503
(PN507, PIN OPEN:1 2, CLOSE:1 3)
NO
DEFECTIVE MAIN
POWER SUPPLY
NO
DEFECTIVE MICOM
NO
DEFECTIVE IC503
NO
DEFECTIVE MICOM
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MECHANISM