IVT 09LR-N Service Manual page 29

Main cause
Open-circuit or short-circuit in wir-
ing of light receiving section.
Light receiving unit is defective
Dew condensation on light receiv-
ing unit.
5. Louvers do not move
Main cause
Caught in sliding section.
Disconnected connector (CN7) on
PWB,
Contact of solder on PWB
(connector section on PWB)
6. There is noise in TV/radio
Main cause
Grounding wires not connected
properly.
TV/radio is placed too close to out-
door unit.
Other than above.
7. Malfunction occurs
Main cause
Malfunction caused by noise.
8. 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.
Temp. fuse of terminal is error
EEEPROM error
AC Over current error
Inspection method
Check if wires of light receiving
section are caught.
Check signal receiving circuit (mea-
sure voltage between terminals 8
and 10, 9 and 10 of connector
CN17).
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 connections. Grounding wires should be con-
Check distance between TV/radio
and outdoor unit.
Check for radio wave interference.
Inspection method
Check for radio wave interference.
Inspection method
Check wiring between indoor and
outdoor units.
Check IPM continuity.
Check electrolytic capacitor.
Check 20A fuse.
Check 15A fuse.
Measure power supply voltage dur-
ing startup.
Supply current and touch compres-
sor cover (sound absorbing mate-
rial) to check if operation starts.
See (Diagnosis Function and dis-
play mode) on page 3-13
Normal value/condition
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. Remove or correct catching sec-
Connectors or pins should not be
disconnected.
There should not be solder contact. Correct contacting section.
Normal value/condition
nected properly.
If TV/radio is placed too close, it
may become affected by noise.
Normal value/condition
Normal value/condition
Terminal board 1-N: 220-240 VAC,
50 Hz
Terminal board 2: serial signal
See [IPM check method] on page
3-10
See [Inverter electrolytic capacitor
(C9,C10) check method] on page
3-9
Fuse should not be blown.
23010 VAC, 50 Hz
Compressor should start normally. Apply external impact to compres-
Malfunction display section (0-0)
Compressor should start normally.
3 – 7
12LRN
Remedy
Replace wires of light receiving
section.
Replace PWB.
Take moisture-proof measure for
lead wire outlet of light receiving
section.
Remedy
tion.
Install correctly.
Remedy
Connect grounding wires properly.
Move TV/radio away from outdoor
unit.
Remedy
Remedy
Correct wiring.
Replace IPM.
Replace electrolytic capacitor.
Replace fuse/diode bridge.
Replace fuse.
Replace outdoor unit PWB assem-
bly.
Make sure that power supply volt-
age is 200 V or higher.
sor.
Replace compressor.
Replace terminal
Replace outdoor unit PWB
Replace outdoor unit PWB