How To Diagnose The Trouble - Toshiba RAS-18S3KV-E Service Manual

The pulse motor circuits are mounted to both indoor and outdoor units.
Therefore, diagnose troubles according to the trouble diagnosis procedure as described below.
(Refer to the check points in servicing written on the wiring diagrams attached to the indoor/outdoor units.)
No.
1 First Confirmation
2 Primary Judgment
3 Judgment by Flashing LED of Indoor Unit
4 Self-Diagnosis by Remote Controller (Check Code)
5 Judgment of Trouble by Every Symptom
6 Check Code 18 and 1E
7 Troubleshooting
8 How to Diagnose Trouble in Outdoor Unit
9 How to Check Simply the Main Parts
10 How to Simply Judge Whether Outdoor Fan Motor is Good or Bad
Precautions when handling the new inverter (3DV Inverter)
The high voltage circuit is incorporated.
Be careful to do the check service, as the electric shock may be caused in case of touching parts on the
P.C. board by hand.
The new inverter (3DV inverter) will be incorporated starting with this unit.
The control circuitry has an uninsulated construction.
Shared potential

11. HOW TO DIAGNOSE THE TROUBLE

Troubleshooting Procedure
CAUTION: HIGH VOLTAGE
MCU
Amplifier
Table 11-1
IGBT × 6
Driver Amplifier
FET × 6
Driver
Fig. 11-1
– 64 –
FILE NO. SVM-15009
(3DV: 3-shunt Discrete Vector control)
Compressor
Fan motor