LG LPC-LM440A/X User Manual

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• POWER IC TROUBLESHOOTING
1)2CH(L/R)
2)SUB-WOOFER
Check Signal in
IC901 Pin6,Pin8
Check IC 901 PIN10(Mode1) ➞
MAIN Vcc
Check IC 901 PIN11(SVR) ➞ MAIN Vcc/2
Check Micom port 99(Mode1_control)➞”0.6V ”
Check Q271,Q272
OUTPUT O.K
Check the IC301 Pin12,
Pin17
Check Q252,Q253
Check Signal in
IC901 Pin6,Pin8
Check the IC301 Pin12,
Pin17
Check Q252,Q253
Check Signal in
IC901 Pin9,Pin12
Check the Low-pass
Block(IC802)
Check IC802 Pin 5
Check IC802 Pin 8
Check IC 901 Pin5(Mode2) ➞
MAIN Vcc
Check Micom port
97(Mode2_control) ➞ “HIGH”
OUTPUT O.K
YES
YES
YES
YES
NO NO
NO
NO NO
NO
Check Signal in
IC601Pin3,Pin5
If head phone jack is inserted
1) Micom port 48(H/P IN) ➞ ”Low ”
2) Micom port 9(AMUTE) ➞ ”High ”
3) IC901 Pin 5&Pin10 ➞ ”Low ”
OUTPUT O.K
Check the Q601,Q651
Check IC601 Pin8(6.8V)
YES
NO

LG LPC-LM440A/X Specifications

General

Brand	LG
Model	LPC-LM440A/X
Category	Stereo System
Language	English