LG GR-GR-L257BTBA Service Manual page 46

EXPLATION FOR MICOM CIRCUIT
1-10. Temperature compensation and over-cool/weak-cool compensation circuit
1. Temperature compensation at freezing room, cold storage room
1) GR-P257, L257, P217, L217
2) GR-C257, B257, C217, B217
Freezing room
Resistance value
(R)J1 (R)J2
6.2 kΩ
5.1 kΩ
3 kΩ
2.4 kΩ
1.2 kΩ
1 kΩ
1.8 kΩ
2.7 kΩ
3.9 kΩ
5.1 kΩ
u Temperature compensation table by adjustment value (difference value against current temperature)
Ex) If changing compensation resistance at a cold storage room (RCR1) from 10 kΩ (current resistance) to 18 kΩ
(modified resistance), temperature at the cold storage will increase by +1°C.
Ex) Now (R)J1= , (R)J2=1.2kΩ, RCRI=5.6kΩ
+2°C for Cold storage room temperature
(R)J1 = 12kΩ
(R)J2 = 12kΩ
RCRI = 5.6kΩ
Temperature Resistance value
compensation
+5 °C
+4 °C
+3 °C
+2 °C
+1 °C
0 °C
-1 °C
-2 °C
-3 °C
-4 °C
-5 °C
1kΩ
18kΩ
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(R)J1
(R)J2
Cold storage room
Temperature
(RCR1) compensation
180 kΩ +2.5 °C
56 kΩ +2.0 °C
33 kΩ +1.5 °C
18 kΩ +1.0 °C
12 kΩ +0.5 °C
10 kΩ 0 °C
8.2 kΩ -0.5 °C
5.6 kΩ -1.0 °C
3.3 kΩ -1.5 °C
2 kΩ -2.0 °C
470 Ω
-2.5 °C
want to compensate -2°C for Freezing room temperature and
: JUMP WIRE
Remarks
Warmly
compensate
Reference temperature
Coolly
compensate