Sanyo SAP-CMRV3143GJH Technical & Service Manual page 27

9-4-1. Outdoor control circuit board
Refer to 9-3-1. Checking the outdoor unit.
NOTE: Do not remove or insert the outdoor control circuit board connector when power is being supplied to it.
(The controller will be damaged.)
9-4-2. HIC
HIC measurement points
+
+
(Black)
–
U
–
V
(Red)
W
∞
Continuity
Perform the continuity tests shown in the table above. Locations which are not as shown in the table have suffered HIC
failures.
NOTE: Ordinarily, the red lead of the tester has negative polarity. However, the reverse may be true, particularly with digital
testers. Use caution.
9-4-3. Fuse
Check the continuity visually or with a tester.
9-4-4. Compressor
Check for an open circuit in the compressor coil winding.
9-4-5. Compressor protective sensor (compressor discharge temperature thermistor)
Check that the sensor is securely contained in the thermostat holder.
9-4-6. Outdoor fan motor
Turn the fan slowly by hand.
If the fan rotates easily:
a Replace the running capacitor on the outdoor control circuit board.
b Check for an open circuit in the fan motor coil winding.
c Use the tester AC range to check whether voltage is reaching the connector on the outdoor fan motor circuit board. If
the needle moves, the result is normal.
If the fan does not rotate easily:
a Check whether something is obstructing the fan, or if the fan itself is coming into contact with the outer case, preventing
it from rotating. Correct if necessary.
b Otherwise, the fan motor bearings have seized. Replace the bearings.
9-4-7. 4-way valve
Of the outdoor control circuit board connector T-RUN/TEST terminals, short-circuit the T-RUN terminal to the COM terminal.
Perform a test run of the unit alone, and check whether the 4-way valve inside the outdoor unit produces a click sound.
9-4-8. Coil thermistor
Check that the sensor is securely contained in the thermostat holder.
+ –
U U
–
V V
W W
+
U
– +
V
W
∞
Below Below
1kΩ 1kΩ
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