LG RC-185 Service Manual page 59

VDR ELECTRICAL TROUBLESHOOTING GUIDE
No 5.0V
NO
Is the Vcc(5.3V) sup-
plied to Q162 collector?
YES
NO
Is the Q162 Base
'H'?
YES
Check or Replace
the Q162
No REG 12V
NO
Is the Vcc(13V) supplied
to Q165 collector?
YES
NO
Is the Q165 Base
'H'?
YES
Check or Replace
the Q165
Check or Replace
the D123
Check the 33V Line
or ZD161
Check or Replace
the D122
Check the 33V
Line or ZD152
3-67
No 33V
NO NO
Is the Vcc(34V) supplied
to Q161 Emittor?
YES YES
NO
Is the Q161 Base
'L'?
YES
Check or Replace
the Q161
No Cap Vcc or
13.5VA
NO
Is the D122 Normal?
YES
Power Line of Main
PCB is short
Check or Replace
the D126
Check the PWR CTL
"H" signal from µ-com
Replace the D122