How To Diagnose The Trouble - Toshiba RAS-M10GKCVP-E Service Manual

The pulse modulating 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 Self-Diagnosis by Remote Controller (Check Code)
4 Judgment of Trouble by Every Symptom
5 Trouble Diagnosis by Outdoor LED
6 Troubleshooting
7 How to Diagnose Trouble in Outdoor Unit
8 How to Check Simply the Main Parts
9 How to Simply Judge Whether Outdoor Fan Motor is Good or Bad
NOTE :
A large-capacity electrolytic capacitor is used in the
outdoor unit controller (inverter). Therefore, if the
power supply is turned off, charge (charging voltage
DC280V) remains and discharging takes a lot of
time. After turning off the power source, if touching
the charging section before discharging, an electri-
cal shock may be caused. Discharge the electrolytic
capacitor completely by using soldering iron, etc.

11. HOW TO DIAGNOSE THE TROUBLE

Troubleshooting Procedure
Discharging position
(Discharging period
10 seconds or more)
Table 11-1
< Discharging method >
1. Remove the inverter cover (plating) by opening
four mounting claws.
2. As shown below, connect the discharge resis-
tance (approx. 100Ω/40W) or plug of the solder-
ing iron to voltage between + – terminals of the
C13 ("CAUTION HIGH VOLTAGE 320V" is
indicated.) electrolytic capacitor (500µF/400V) on
P .C. board, and then perform discharging.
Plug of
soldering iron
Fig. 11-1
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Page
65
65
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69
74
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83
Inverter cover
P . C. board
(Soldered surface)