Samsung MH020FPEA, Service Manual

Page: 182 / 208

12-9 Samsung Electronics
Troubleshooting
12-9
12-3-3 Checking Indoor controller
1. MH
✳✳✳
FPEA
✳
/ MH
✳✳
VP2-
✳✳
1. 1) Checking FUSE
1. 1) This control PCB has 2 fuses, F701 and F702.
1. 1) If F702 is blown PCB circuit has some damage and replace PCB.
1. 2) Checking DC voltage
1.
■
Measure voltage between CN32 pin 1 (+12V) and CN32 pin 2 (GND).
1.
■
Normal voltage is between 11.5V and 12.5V.
12-3-4 Checking Power cable and Communication cable
See 12-2 "Checking and Testing operations" and installation manual.
12-3-5 Checking Temperature sensor
See 12-5 "Fault Diagnosis of Major Parts".
In case of a sensor in outdoor unit, temperature can be monitored with "VIEW MODE".
Press K4 key on the outdoor display PCB for several time to change the display to sensor temperature value.
Left 1 digit of the LED is data index and Right 2 digits are the value.
Index Value Remark
8 Discharge sensor temperature
9 OLP sensor temperature
The unit is degree C
A Condenser sensor temperature
B Outdoor sensor temperature
24296A(1)_2 11/11/05 5:07 PM Page 12-9