Service Manual

SiUS121827E Check
Part 6 Service Diagnosis 239
Caution
1. If all the LEDs are lit uniformly, the compressor is defective.
→ Replace the compressor.
2. If the LEDs are not lit uniformly, check the power module.
→ Refer to Check No.22.
3. If NG in Check No.22, replace the power module.
(Replace the main PCB. The power module (IPM1) is united with the main PCB.)
If OK in Check No.22, check if there is any solder cracking on the PCB.
4. If any solder cracking is found, replace the PCB or repair the soldered section.
If there is no solder cracking, replace the PCB.
1. When the output frequency is low, the LEDs blink slowly. As the output frequency increases, the
LEDs blink quicker. (The LEDs look like they are lit.)
2. On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
Otherwise, the terminals may be burned due to loosening.
(R15292)
Direction of crimp
FASTON terminal
This size is shortened
by the crimp.