Electric Parts Troubleshooting Guide; Electronic Parts Troubleshooting Guide - Heat Controller VMC09SB-1 Service Manual

Part 4 Trouble Shooting

6. Electronic Parts Troubleshooting Guide

The Product doesn't operate at all. (9~30kBtu/h Model)
Trouble 1
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 PCB Ass'y
(Fuse,Noise Filter, Power Module(SMPS), IC01D,IC04D)
The operation check of the P.C.B. Ass'y
Procedure
1) The input voltage of Power
Module(SMPS)
2) The output voltage of Power
Module (SMPS)
3) IC01D(LD1085), IC04D(7805)
Only for training and service purposes
Turn off the main power and wait until LED on outdoor PCB is off.
Turn on the main power again.
"Beeping" sound is from the indoor unit?
Flashing LED mounted on the outdoor PCB?
NO
: DC 220V~390V
: 15V ¡¾ 10%
: DC 5V
Specification
- 40 -
YES
• Primarily, the operating condi-
tion of Micom is O.K.
• Check CN-DISP1
Remedy
Replace the P.C.B.