View LG GR-122SJ Service Manual online
2. Disconnect 2 lead wires connected to the defrost
2. Remove the lamp, in the grill part of the control box-R,
The compressor inhales low temp. and low pressure gas
evaporated from Evaporator of the refrigerator, and
condenses this gas to high temp. and high pressure gas,
and then plays delivering role to Condenser.
The compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
There are PTC-Starter, and Over Load Protector in the
On the other hand, because the Compressor consists of
1/1000mm processing precision components and is sealed after
producing without dust or humidity, deal and repair with care.
(1) Be careful not to allow over voltage and over current.
(2) No strike
dealing), poor operation and noise may occur.
Hermetic Terminal, poor operation and poor contact
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock and noise.
(1) PTC (Positive Temperature Coefficient) is no-contact
material and the material consists of BaTiO
device of motor.
(1) PTC is attached to hermetic Compressor used to
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub
coil. After the starting is over, the current is cut off in
sub coil. The proper features of PTC play the above all
roles. So, PTC is used as a starting device of motor.
According to Starting Method of Motor
(1) For restarting after power off during normal
5 min. for pressure balance of refrigerating cycle and
if PTC isn't cooled for a while after power off, Motor
can't start operation again.
(1) If power off during operation of Compressor and power
reconnect a power plug due to misconnecting),
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and motor can't
operate and OLP operates by flowing over current in
normal operation. If OLP doesn't operate when PTL is
not cooled, Compressor motor is worn away and
causes circuit-short and fire.
Therefore, use a proper fixed OLP without fail.
(2) No Strike
PTC materials may break due to insulation breakdown
of material itself.
outside of PTC-starter, resistance value alters and poor
starting of Compressor motor may cause.
(1) OLP (OVERLOAD PROTECTOR) is attached to the
current to the Motor if the temperature rises and
activates the bimetal spring in the OLP.
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.
(1) The OLP is attached to the Hermetic Compressor used
Motor Coil from being started in the Compressor.
(Composition and connection Diagram of OLP)
1. By taking out two screws attaching in lower hinge,
1. Disassemble the sheet hinge assembly by remove two
switch. Remove lead socket from the switch.
detach the thermostat. (Figure 9)