Sharp DW-71-H, Service Manual, Page: 22 / 40

22
DW-71-H
LIST OF TROUBLES AND CORRECTIVE ACTIONS
When replacing parts, be sure to use the specified parts.
Servicing of PWB assembly
The electrical circuit consists of operation PWB ass’y and power supply PWB ass’y. Both of them correspond to X.
It is advisable to replace individual parts, referring to the following troubleshooting.
It must be noted here that the possible cause of trouble may be PWB failure even when you do not see the description
“PWB failure” in the column of Cause in the Troubleshooting table.
In the "Checking" column, only the item specific to the pertinent model are shown. Common items are not shown.
Trouble
1. Indication is not
correct.
2. The dehumidifier
fails to run.
3. The compressor
fails to run at all.
4. The compressor
does not run
normally.
No indication appears.
Part of display does not
appear or excessive
indication appears.
The FULL WATER
STOP is actuated even
when the tank is not full
of water.
Connector and harness
failure
230V power supply
The “FULL” lamp lights.
Power switch
Compressor motor
winding resistance
(main and sub)
“FULL” switch
Capacitor
Protector
Both end voltage of
compressor
Power supply voltage
Starting voltage
Compressor sub-winding
Capacitor
Power is not supplied when the
switch lever is pressed (ON).
(“FULL” indication appears.)
Capacitor opened or short-circuited
Protector opened
Voltage detected: Check parts of
compressor.
Voltage not detected: Check drive
parts of compressor.
Power supply voltage not within
230V
±
10%
When the compressor is started,
voltage is below 209V.
Sub-winding opened
Capacitor opened
Replace the “FULL” switch.
Replace the capacitor.
Replace the protector.
Repair or replace.
Repair or replace.
Ask voltage adjustment.
Ask increase of capacity.
Replace the compressor.
Replace the capacitor.
• The water tank has not been
installed yet.
• The water tank has been installed
improperly.
Operation PWB ass’y failure
The “FULL” switch is not actuated.
Connector and harness improper
connection
Voltage drop (within 230V
±
10%)
The water tank is full of water.
Power switch failure
Winding opening or shot-circuiting
Main winding resistance: 38.7
Ω
Sub-winding resistance: 72.2
Ω
at
20˚C
Install correctly the water tank.
Repair or replace
Replace the “FULL” switch (repair if
assembly is defective)
Contact shop
Discharge water from the water tank.
Replace parts.
Replace the compressor.
• Operation PWB ass’y failure
• Power supply PWB ass’y failure
• Wiring failure
Improper insertion of connector
Harness breakage Repair or replace
Repair or replace
Repair
Checking Troubleshooting and cause Corrective action