Service Manual 53
Troubleshooting Guide
Electronic Parts
Product does not operate at all.
(* Refer to Electronic Control Device drawing and Schematic diagram.)
Turn off Main Power
Turn on Main Power
Does "beeping" sound is made from the Indoor Unit?
Primarily, the operating condition of Micom is OK.
Check the voltage of power(About AC 115V, 60Hz)
• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
cable
• Check PWB Ass'y(Outdoor unit)
- Fuse
- Pattern damage
- Varistor(ZNRI)
Check the connection housing for contacting
• Connector related to CN-POWER
• Connector related to CN-FAN
• Connector contacting of Outdoor Fan/Compressor
• Display PWB Ass'y Check
• Connector related to CN-DC/DC
Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector(including connecting
cable of Indoor/Outdoor Unit)
PCB Board Operation Check
Items
• Power Transformer
(Outdoor unit)
- Input Voltage
- Output Voltage
• IC2 (Outdoor),
IC1Ø (Indoor) Output
• IC3 (Outdoor),
ICØ4D (Indoor) Output
• IC4 (Outdoor),
IC01A (Indoor),
OSCØ1B (8MHz/4MHz)
• Replace Trans
• Replace IC2, IC1Ø
• Replace IC3, ICØ4D
• Replace faulty parts
- About AC115V
±
10% - Check the power voltage
- About AC17
±
3V
• DC
+
12V
• DC
+
5V
• Voltage of Outdoor unit Micom No. 8,
Voltage of Indoor unit Micom No. 36 and soldering
condition
Content Remedy
NO
YES
(After 10 seconds)
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