Toshiba MMK-AP0072H Service Manual page 99

Indoor fan starts rotating by connecting plug socket.
[P.C. board fan motor output voltage (DC) check]
Measure voltage between
and pin (V line (Plus): Yellow) of connector CN210.
5
Above DC1.0V
Indoor main P.C. board
(MCC-1510) error
Check code name
[P13] / [47]
(Current code / AI-NET)
Are connections of outdoor
PMV1/PMV2 connectors correct?
YES
Are operations of outdoor
PMV1/PMV2 normal?
YES
Are characteristics of Pd sensor/Ps sensor
output voltage normal?
YES
Is SV2 valve coil correctly connected?
YES
Are balance pipe service valves
of all units fully opened?
YES
Is there no clogging of SV3B valve?
NO
Is there no clogging of SV3B valve of
a unit other than unit with error?
NO
Is there no leakage of check valve of
main discharge pipe in follower units in which
compressors are driven in cooling operation?
NO
Check I/F P.C. board.
pin (GND (Minus): Black)
3
Below DV1.0V
Indoor fan motor error
Check code name
Outdoor liquid back detection error
NO
NO
NO
NO
NO
YES
YES
YES
1. PMV1/PMV2 error
2. Pd sensor, Ps sensor error
3. Clogging of SV2 circuit
4. Clogging of SV3B circuit, balance pipe
5. Leakage of main discharge pipe
6. Outdoor I/F P.C. board error
99
FILE NO. SVM-05052
P.C. board
CN210
6 Blue
5 Yellow
Yellow 4 White
Black 3 Black
2 —
1 Red
DC
Cause of operation
Correct connector connection.
(CN300, CN301)
PMV error
Pd sensor/Ps sensor error
Correct connector connection.
(CV2: CN302)
Open fully balance pipe
service valves of all units.
Replace clogging parts.
Replace clogging parts.
Replace check valve
of main discharge pipe.