LG LRTP-1231W precautio, Service Manual

Page: 27 / 45

26
7-2-2 OSCILLATION CIRCUIT
This circuit is to generate the base clock for calculating time and the synchro clock
for transmitting data to and from the inside logic elements of the IC1 (MICOM). Be
sure to use the exact replacement parts since the calculating time by the IC1 may
be changed or it will not work if he OSC1 SPEC is changed.
7-2-3 RESET CIRCUIT
The reset circuit is for allowing all the functions to start at the initial conditions by
initializing various parts including the RAM inside the MICOM (IC1) when the
power is initially supplied or the power supply to the MICOM is restored after a
momentary power failure. For the initial 10 ms of power supply, LOW voltage is
applied to the MICOM RESET terminal. During a normal operation, 5 V is applied
to the RESET terminal. (If trouble occurs in the RESET IC, the MICOM will not
work).