Checking The Electrical Components; Measurement Of Insulation Resistance - Sanyo XHS3632 Service Manual

4-2 Checking the Electrical Components

(1) Measurement of Insulation
Resistance
• The electrical insulation is acceptable
when the resistance exceeds 1 M .
1 1 1 1 1
Power Supply Wires
Clamp the earthed wire of the Power
Supply wires with a lead clip of the
insulation resistance tester and mea-
sure the resistance by placing a probe
on either of the power wires. (Fig. 21)
Then measure the resistance between
the earthed wire and the other power
wires. (Fig. 21)
2 2 2 2 2
Indoor Unit
Clamp an aluminum plate fin or copper
tube with the lead clip of the insulation
resistance tester and measure the
resistance by placing a probe on the
terminal plate (Fig. 22)
3 3 3 3 3
Outdoor Unit
Measure the resistance by placing a
probe on the terminal plate in the same
manner as explained above 2. (Fig. 22)
4 4 4 4 4

Measurement of Insulation Resistance

for Electrical parts
• Disconnect the connector of the
desired electric part from terminal
plate, P.C.B. Ass'y, etc. (Fig. 23)
• Similarly, disconnect the lead wires
from compressor, capacitor, etc.
(Fig. 24)
• Measure the resistance in the same
manner as illustrated on the right.
Refer to Electrical Wiring Diagram.
NOTE
If the probe does not enter the hole
because the hole is too narrow, use a
probe with a thinner pin.
4. Service procedures
Earthed wire
Clip
Probe
Terminal plate
Clip
Copper
tube or
metallic part
Clip
Copper
tube or
metallic part
Insulation
tester
From fan motor,
compressor and other
parts.
Probe
Metallic
part
Clip
– 87 –
Insulation
Fig. 21
tester
0638_X_S
Probe
Insulation
tester
Fig. 22
0639_X_S
Probe
Fig. 23
0640_X_S
Insulation
tester
Fig. 24
0641_X_S
SM830076
Section
1
2
3
4