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How to check mis-wiring and serial signal error (when outdoor unit does not work)
E
1. Turn OFF power supply.
2. Turn ON power supply.
3. Press
EMERGENCY OPERATION
switch.
3 min. later, when relay 52C turns ON, what self-check result is
displayed on OPERATION INDICATOR lamp on indoor unit?
❈
1
Start
1. Turn OFF power supply and disconnect in-out connecting wire on indoor side.
2. Short-circuit between indoor terminal block and
3. Turn ON power supply and press EMERGENCY OPERATION switch.
3
N
•Turn OFF power supply.
•Connect ON in-out connecting wire.
•Turn ON power supply.
3 minutes later, when EMERGENCY OPERATION switch is pressed
and 52C relay turns ON, is there AC 220-240V between outdoor
terminal block - ?
N
2
Under the same condition as 3 minutes later, when
EMERGENCY OPERATION switch is pressed and
52C relay turns on, is there DC 5V between
J8 -J7 ?
Under the same condition as 3 minutes later, when
EMERGENCY OPERATION switch is pressed and
52C relay turns on, is there DC 10V between both
ends of R601?
(By tester, the stylus is between 5 ~10V)
Replace the outdoor DEICER P.C. board.
Rectify in-out connecting wire.
Check and rectify fuse and varistor on out-
door 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
relay (52C) 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)
MSH-07NV
MSH-09NV
MSH-12NV
MSH-18NV
OB207t-2qxp 25/9/97 8:56 PM Page 53