LG GR-B206GVQA User Manual download pdf (Page 38)

1.

Explanation

for

PWB

circuit

1-1.

Power

circuit

1.

GR-L197, GR-L207, GR-L247,

GR-P207,

GR-P247,

GR-B197, GR-B207, GR-B247,

GR-C207,

GR-C247

Power

circuit

consists

of

SMPS

(SWITCHING

MODE

POWER

SUPPLY)

power.

The

SMPS

consist

of

the

rectifying

part

(BD1,

CE1)

converting

AC

voltage

to

DC

voltage,

the

switching

part

(IC2)

switching

the

converted

DC

voltage,

transformer

transferring

energy

of

the

primary

side

of

the

switching

terminal

to

the

secondary

side

and

the

feedback

part

(IC3,

IC4)

transferring

it

to

the

primary

side.

Caution

:

Since

high

voltage

(DC310V)

is

maintained

at

the

power

terminal,

please

take

a

measure

after

more

than

3

minutes

have

passed

after

removing

power

cords

in

the

abnormal

operation

of

a

circuit.

Voltage

of

every

part

is

as

follows:

EXPLATION

FOR

MICOM

CIRCUIT

-38-

Part

VA1

CE1

CE2 CE3

CE4

CE

Voltage

220

Vac

inspection

Vdc

16

Vdc

12

Vdc

15.5

Vdc

5

Vdc

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 124 125

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