Cpu(System Control) Circuit - LG LSS-3200A Service Manual

5. CPU(System Control) CIRCUIT

START
YES
Power is supplied normally?
YES
Clock signals are OK?
YES
Reset signals are OK at the time of
power- on reset?
YES
Chip selection signals are OK?
YES
IIC channels are OK?
YES
Interrupt signals are OK?
YES
Messages are output through
RS- 232C port on PC terminal?
YES
END
NO
NO
NO
NO
NO
NO
NO
(G) RS- 232C check
3-21
(A) Power check
(B) Clock check
(C) Reset check
(D) CS check
(E) IIC check
(F) Interrupt check