Friedrich AS - W126BMS0, Service Manual

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Part 4 Trouble Shooting
The Product doesn’t operate at all. (9~30kBtu/h Model)
Turn off the main power and wait until LED on outdoor PCB is off.
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
Does "Lighting" LED is mounted on the outdoor PCB?
• Primarily, the operating condi-
tion of Micom is O.K.
• Check CN-DISP1
Check the voltage of power(AC 208~230V, 60Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse,Noise Filter, Power Module(SMPS), IC01D,IC04D)
• Connection between housing and harness.
• All the harnesses should be checked by pulling with hands directly.
• No harness should be divided from the housing.
Trouble 1
NO YES
The operation check of the P.C.B. Ass'y
Procedure
Specification
1) The input voltage of Power
Module(SMPS)
2) The output voltage of Power
Module (SMPS)
3) IC01D(LD1085), IC04D(7805)
: DC 220V~390V
: 15V
±
10%
: DC 5V
Remedy
Replace the P.C.B.
6. Electronic Parts Troubleshooting Guide