Explation For Micom Circuit; Explanation For Pwb Circuit; Power Circuit; Oscillation Circuit - LG GR-B207WVQ.CSWQAGE Service Manual

EXPLATION FOR MICOM CIRCUIT

1. Explanation for PWB circuit

1-1. Power circuit

Voltage of every part is as follows:
Part VA1
Voltage 220 Vac

1-2. Oscillation circuit

Oscillation circuit is a circuit with the purpose of generating
basic time for clock occurrence for synchronization and time
calculation in relation with information transmission/reception
of inside elements of IC1 (MICOM). The OSC1 must always
use rated parts since if SPEC is changed,time calculated at
the IC1 may be changed or no operation is done.
1-3. Reset circuit
The reset circuit is circuit allowing various parts such as RAM
inside of MICOM (IC1) to initialize and the whole of function
to start from the initial status, when initial power is input or
when power is applied again to MICOM by a spontaneous
power failure. 'LOW' voltage is applied to the reset terminal
of MICOM in the beginning of power supply for a constant
time (10ms). Reset terminal during general operation is 5V
(No MICOM operates in failure of RESET IC).
CM1 CM2
14 Vdc 17 Vdc
- 14 -
CE2 CE4
12 Vdc
5Vdc