How To Diagnose The Trouble - Toshiba RAS-M10YKV-E Service Manual

The pulse modulating circuits are mounted to both
indoor and outdoor units. Therefore, diagnose
troubles according to the trouble diagnosis proce-
dure as described below. (Refer to the check points
in servicing written on the wiring diagrams attached
to the indoor/outdoor units.)
Table 10-1
No. Troubleshooting Procedure
1 First Confirmation
2 Primary Judgment
3 Judgment by Flashing LED of Indoor Unit
Self-Diagnosis by Service Check Remote
4
Control
5 Judgment of Trouble by every symptom
6 How to Check Simply the Main Parts
10-1. First Confirmation
10-1-1. Confirmation of Power Supply
Confirm that the power breaker operates (ON)
normally.

10. HOW TO DIAGNOSE THE TROUBLE

Page
49
50
51
52
55
63
Discharging position
(Discharging period
10 seconds or more)
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.
< Discharging method >
(1) Remove the inverter cover (plating) by opening
four mounting claws.
(2) As shown below, connect the discharge resis-
tance (approx. 100Ω40W) or plug of the solder-
ing iron to voltage between + – terminals of the
C15 ("CAUTION HIGH VOLTAGE 320V" is
indicated.) electrolytic capacitor (500µF/400V)
on P.C. board, and then perform discharging.
Plug of
soldering iron
Fig. 10-1
10-1-2. Confirmation of Power Voltage
Confirm that power voltage is AC 220–230–240 ±
10%. If power voltage is not in this range, the unit
may not operate normally.
– 49 –
Inverter cover
P . C. board
(Soldered surface)