Samsung MH035FWEA, Service Manual

Page: 181 / 208

Samsung Electronics 12-8
Troubleshooting
12-8
4. Checking Display PCB LED if Error code is displayed.
See error code table if displayed.
5. Checking DC voltage on each point
6. Checking PFC
6. When Input current is over 3.0A PFC circuit will work to control the harmonics of AC current.
Checking is measuring DC-LINK voltage.
PFC ON (Compressor is working) : DC LINK voltage is over 300Vdc (AC line >220V )
After starting compressor DC Link voltage is going down because of compressor load.
But in case of 3.0A above , DC link voltage will go up over 300V. This voltage is in proportion to AC input voltage.
Current can be monitored with "VIEW MODE".
Press K4 key on the outdoor display PCB for several times to change the display to sensor temperature value.
Left 1 digit of the LED is data index and Right 3 digits are the value
Item Measuring point Normal value
DC LINK Q803 E(-)~D101 Cathode (+)
about 1.4 times as much as Power AC Voltage
ex) AC220V
→
305~310Vdc
inverter 15V C803 voltage 14.5V~15.5V
Main control 12V CN59 pin 1~pin 3 12V~15V
Main control 5V CN59 pin 1~pin 2 4.75V~5.25V
Index Value Remark
C
Estimated Primary current value from
The unit is 0.1A
Compressor current
24296A(1)_2 11/11/05 5:07 PM Page 12-8