Malfunction (Parts) Check Method - Sharp AE-Z40KR Service Manual

AYZP40KR
Main cause
TV/radio is placed too close to
outdoor unit.
7. Compressor does not start
Main cause
Erroneous inter-unit connection.
Damaged IPM.
Dried-up electrolytic capacitor.
Blown outdoor unit fuse.
Power supply voltage is too low.
Compressor lock.
8. Operation stops after a few minutes and restarts, and this process repeats
Main cause
Dried-up electrolytic capacitor.
Layer short-circuit in expansion
valve coil.
CAUTION: If fuse FU1/FU4/FU5 (outdoor unit control circuit board) is blown, be careful of charging voltage in inverter electrolytic capacitor C9, C10.
To discharge stored electricity, unplug the power cord and connect the plug of a soldering iron (230VAC, 50W) between the positive and
negative terminals of inverter electrolytic capacitor C9, C10.

[6] MALFUNCTION (PARTS) CHECK METHOD

1. Procedure for determining defective outdoor unit IPM/compressor
The following flow chart shows a procedure for locating the cause of a malfunction when the compressor does not start up and a DC overcurrent indi-
cation error occurs.
Inspection method
Check distance between TV/radio
and outdoor unit.
Inspection method
Check wiring between indoor and
outdoor units.
Check IPM continuity.
Check electrolytic capacitor.
Check 20-A fuse.
Check 15-A fuse.
Measure power supply voltage
during startup.
Supply current and touch com-
pressor cover (sound absorbing
material) to check if operation
starts.
Inspection method
Measure 320-VDC line voltage.
Measure resistance.
Normal value/condition
If TV/radio is placed too close, it
may become affected by noise.
Normal value/condition
Terminal board 1-N: 230 VAC, 50
Hz
Terminal board 2: serial signal
Fuse should not be blown.
23010 VAC, 50 Hz
Compressor should start nor-
mally.
Normal value/condition
250 V or higher.
463 in each phase (at 20C)
3 – 7
Remedy
Move TV/radio away from outdoor
unit.
Remedy
Correct wiring.
Replace IPM.
Replace electrolytic capacitor.
Replace fuse/diode bridge.
Replace fuse.
Replace outdoor unit PWB
assembly.
Make sure that power supply volt-
age is 198 V or higher.
Apply external impact to com-
pressor.
Replace compressor.
Remedy
Replace electrolytic capacitor.
Replace coil.