46
12-2. Checking Continuity of Fuse
on PCB Ass’y
Check for continuity using a multimeter as shown in
Fig. 6.
Method Used to Replace Fuse on PCB Ass'y (when
fuse shape looks like the fuse in either Fig. 5a or 5b)
— Indoor PCB Ass’y —
(1) Remove the PCB Ass’y from the electrical compo-
nent box.
(2) Then pull out the fuse from the PCB Ass’y. (Fig. 5a)
— Outdoor PCB Ass’y —
(1) Remove the PCB Ass’y from the electrical compo-
nent box.
(2) Pull out the fuse at the metal clasp using pliers
while heating the soldered leads on the back side
of the PCB Ass’y with a soldering iron (30W or
60W). (Fig. 5b)
(3) Remove the fuse ends one by one. For replace-
ment insert a fuse of the same rating and solder it.
(Allow time to radiate heat during soldering so that
the fuse does not melt.)
12-3. Checking Motor Capacitor
Remove the lead wires from the capacitor terminals,
and then place a probe on the capacitor terminals as
shown in Fig. 7. Observe the deflection of the pointer,
setting the resistance measuring range of the multime-
ter to the maximum value.
The capacitor is “good” if the pointer bounces to a
great extent and then gradually returns to its original
position.
The range of deflection and deflection time differ
according to the capacity of the capacitor.
NOTE
Fuse
PCB Ass’y
Fig. 5a
Fig. 5b
Fuse
Fig. 6
Multimeter
Ω
Compressor motor
capacitor
Fan motor
capacitor
Fig. 7
Soldering iron
Outdoor
PCB Ass’y
Fuse
Pliers
WARNING
When checking the fixed capacitor (C2) of the out-
door unit, be sure to leave the main power OFF for
more than 10 minutes before performing the check.
Reason:
The outdoor unit controller (Inverter) contains a
large electrolytic capacitor, so a potentially danger-
ous charge (at a voltage of 325 VDC remains even
after the main is turned off. (Refer to page 37.)
