General Troubleshooting Chart - Sharp AY-XP9LSR Service Manual

[5] GENERAL TROUBLESHOOTING CHART

1. Indoor unit does not turn on
Main cause
Cracked PWB.
(Cracked pattern)
Open-circuit in FU1 (250 V, 2.5A).
2. Indoor unit fan does not operate
Main cause
Open-circuit in heat exchanger
thermistor (TH2) (in heating oper-
ation)
Disconnected heat exchanger
thermistor (TH2) (in heating oper-
ation)
3. Indoor unit fan speed does not change
Main cause
Remote control not designed to
allow fan speed change.
4. Remote control signal is not received
Main cause
Batteries at end of service life.
Batteries installed incorrectly.
Lighting fixture is too close, or flu-
orescent lamp is burning out.
Use Sevick light (Hitachi).
Operating position/angle is inap-
propriate.
Open-circuit or short-circuit in wir-
ing of light receiving section.
Defective light receiving unit.
Dew condensation on light receiv-
ing unit.
5. Louvers do not move
Main cause
Caught in sliding section.
Disconnected connector (CN3,
CN4 on relay PWB, louver motor
side)
Contact of solder on PWB
(connector section on PWB)
6. There is noise in TV/radio
Main cause
Grounding wires not connected
properly.
Inspection method
Check visually.
Check melting of FU1.
Inspection method
Measure thermistor resistance
(dismount for check).
Inspect connector on PWB.
Check thermistor installation con-
dition.
Inspection method
Check operation mode.
Inspection method
Measure battery voltage.
Check battery direction.
Turn off light and check.
Check if Sevick light (Hitachi) is
used.
Operate within range specified in
manual.
Check if wires of light receiving
section are caught.
Check signal receiving circuit
(measure voltage between termi-
nals 7 and 8 of connector CN7).
Check for water and rust.
Inspection method
Operate to see if louvers are
caught in place.
Inspect connectors.
Check visually.
Inspection method
Check grounding wire connec-
tions.
Normal value/condition
There should be no cracking in
PWB or pattern.
There should be no open-circuit.
Normal value/condition
Refer to THERMISTOR TEPER-
ATURE CHARACTERISTICS-1
There should be no open-circuit
or faulty contact.
Thermistor should not be discon-
nected.
Normal value/condition
Fan speed should change except
during dehumidifying operation,
ventilation, light dehumidifying
operation, internally normal oper-
ation
Normal value/condition
2.5 V or higher (two batteries in
series connection)
As indicated on battery compart-
ment.
Signal should be received when
light is turned off.
Signal may not be received
sometimes due to effect of Sevick
light.
Signal should be received within
range specified in manual.
Wires of light receiving section
should not have any damage
caused by pinching.
Tester indicator should move
when signal is received.
Signal should be received within
range specified in manual.
Normal value/condition
Louvers should operate smoothly.
Connectors or pins should not be
disconnected.
There should not be solder con-
tact.
Normal value/condition
Grounding wires should be con-
nected properly.
3 – 6
AYXP9LSR
Remedy
Replace PWB.
Replace PWB.
Remedy
Replace thermistor.
Replace thermistor.
Install correctly.
Remedy
Explain to user.
Remedy
Install new batteries.
Install batteries in indicated direc-
tion.
Change light position or install
new fluorescent lamp.
Replace light or change position.
Explain appropriate handling to
user.
Replace wires of light receiving
section.
Replace PWB.
Take moisture-proof measure for
lead wire outlet of light receiving
section.
Remedy
Remove or correct catching sec-
tion.
Install correctly.
Correct contacting section.
Remedy
Connect grounding wires prop-
erly.