LG ARUN Series, Service Manual

Page: 112 / 134

Troubleshooting Guide
- 112 -
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
67*
Master
671
Slave
672
Fan Lock Error
Error
No.
Error Type Error Point Main Reasons
Fan RPM is 10RPM or less
for 5 sec. when ODU fan
starts or 40 RPM or less
after fan starting.
1. Fan motor defect / assembly condition
abnormal
2. Wrong connection of fan motor connector
(Hall sensor, U,V,W output)
3. Reversing rotation after RPM target apply
4. Fan PCB assembly defect
■
Error Diagnosis and Countermeasure Flow Chart
Is ODU Fan Motor Assemble
condition normal?
No
Yes
Recheck power and installation condition
Check ODU Fan Motor assemble condition and fan locking
→
Reassemble or replace if abnormality found
Is ODU Fan Motor normal?
No
Yes
1. Check resistance between each phase(U,V,W) of ODU
fan motor terminal (16.8
Ω ±
5% at 75
°
C(167
°
F))
2. Check insulation resistance between ODU fan motor
terminal(U,V,W)
→
Replace fan motor if abnormality found
Is wire connection of
ODU Fan Motor wire normal?
No
Yes
Check wiring between OUD fan motor and fan PCB
( Check if Hall Senor and Motor output terminal color is
matched)
→
Reassemble if abnormality found
Is Fan PCB assembly normal?
No
Yes
Replace Fan PCB assembly
* Fan Motor resistance measuring
between each phase
* Fan Motor Wire connection
* Hall Sensor connector