Mitsubishi SUZ-KA35VA Service Manual page 91

j Check of power supply
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does the left lamp of OPERATION
INDICATOR lamp on the indoor unit
light up?
Yes
Is there voltage 280 - 370 VDC
between DB61 (+) and DB61 (–) on
the inverter P.C. board?
(Refer to 12-6-3. or 12-6-7.)
No
Check the electric parts in main circuit.
k Check of LEV
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD except
the set temperature in operation display section of the
remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote
controller (the set temperature is displayed) with the
remote controller headed towards the indoor unit.
Expansion valve operates in full-opening direction.
Do you hear the expansion valve "click,
click·······"?
Do you feel the expansion valve vibrate
on touching it ?
No
Is LEV coil properly fi xed to
the expansion valve?
Yes
Does the resistance of LEV
coil have the characteristics?
(Refer to 12-4.)
No
Replace the LEV coil.
NOTE : After check of LEV, do the undermentioned operations.
1. Turn OFF the power supply and turn ON it again.
2. Press RESET button on the remote controller.
OC322G
Rectify indoor/outdoor
connecting wire.
Is there voltage 230 VAC
between the indoor terminal
No
block S1 and S2?
Dose LED on the inverter P.C.
board light up or fl ash?
Yes
(Refer to 12-6-3. or 12-6-7.)
If light up, OK.
If fl ash, refer to 12-3.
(For wireless remote controller use model)
1
OK
Yes
Properly fi x the LEV coil to the expansion valve.
No
Measure each voltage between connector
pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
Yes
4. Pin (-) — Pin (+)
Is there about 3 ~ 5 VAC between each?
NOTE: Measure the voltage by an analog
tester.
Replace the expansion valve.
[SUZ-KA25/35VA(H)R1.TH
DB61
Inverter P.C. board
(Solder side)
Yes
No
No
Yes
h
ON/OFF
TOO TOO
WARM COOL
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
Yes
91
SUZ-KA50VAR2.TH]
280 - 370 VDC
Replace the indoor
electronic control P.C.
board.
Replace the inverter
P.C. board.