Mitsubishi Electric MSH-C18TV, Руководство по обслуживанию

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43
Yes
Yes
How to check mis-wiring and serial signal error
G
1. Turn OFF the power supply.
2. Turn ON the power supply.
3. Press the EMERGENCY OPERATION switch.
3 min. later, when 52C contactor turns ON, what self-check result is
displayed on OPERATION INDICATOR lamp on the indoor unit?
❈
1
Start
1. Turn OFF the power supply and disconnect in-out connecting wire on the indoor side.
2. Short-circuit between indoor terminal block and .
3. Turn ON the power supply and press the EMERGENCY OPERATION switch.
3 N
1. Turn OFF the power supply.
2. Re-connect in-out connecting wire.
3. Turn ON the power supply.
3 minutes later, when the EMERGENCY OPERATION switch is
pressed and 52C contactor turns ON, is there 230V AC between the
outdoor terminal block - ?
❈
2
N 2
Is there 5V DC between J8 -J9 (MSH-C18TV) /
J401 - J101 (MSH-C24TV) on the deicer P.C.
board?(Refer to page 45 or 46.)
❈
2
Is there 10V DC between both ends of
R601?(Refer to page 45 or 46.)
❈
2
(By tester, the stylus is between 5 ~10V)
Replace the deicer P.C. board.
Rectify in-out connecting wire.
Check and rectify the fuse and the varistor
on the deicer P.C. board.
Rectify in-out connecting wire.
Replace the indoor electronic control
P.C. board.
❈
1 Short circuit of JPG and JPS on the
indoor electronic control P.C. board
enables self-check to be displayed in 3
seconds.
Serial signal error is indicated.
(0.5-sec.ON, 2.5-sec.OFF)
Repair wiring.
Is there mis-wiring, poor contact, or wire disconnection?
Is there 20V DC between both ends of R132 when
52C contactor turns ON?
( By tester, the stylus is between 0 ~ 20V. )
+
–
+
–
Yes
Yes
No
No
No
No
No
Yes
Mis-wiring is indicated.(0.5-sec.ON, 0.5-sec.OFF)
❈
2 While the serial signal error is indicated,
52C contactor alternates ON for about 10
seconds and OFF for 3 minutes.
Measure the voltage when 52C contactor
is ON.
Check of outdoor thermistor
Thermistors in the outdoor unit are abnormal.
W
Disconnect the connector CN661 and CN662 from the deicer P.C. board.
(Check the characteristics of each thermistor.)
Measure
resistance
between CN 661
1
and
2
.
Measure
resistance
between CN 662
3
and
4
.
No
Yes
Replace the
thermistor.
Defrost thermistor (RT61)
Re-connect CN661
and CN662.
Turn ON the power
supply and press
the EMERGENCY
OPERATION
switch.
Ambient
temperature
thermistor (RT63)
Does the resistance
of thermistor have
the characteristics
on page 45 or 46?
No
Yes
Does the unit operate
10 minutes or more?
Replace the deicer P.C.
board.
Ok
❈
3
❈
3 It is thought defective contact of the connector.
Turn OFF the
power supply.
<MSH-C24TV only>
H
Outdoor unit doesn’t operate.
OB279-2.qxp 2/15/01 10:55 AM Page 43