– 96 –
LD304 blinks once.
Communication error.
Is DC voltage of about 35V
being output to C, D terminals?
(DC33v~38.5V is output
normally.)
Yes
No
Interface relay
Coil terminal
Contact terminal
Is voltage of about 35V being output
to both ends of R713?
Is DC 12V being applied to both
ends of control side (coil terminals)
of interface relay?
Is voltage (10V or more) being
generated between contact
terminals of interface relay?
Check interface curcuit.
Yes
Yes
No
No
No
Yes
D707 and C710 could be defective.
There may be defective parts between
12V output of switching power supply on
control P.W.B. and interface relay. (Also
be care of solder-touch, etc.)
Repalce interface relay.
Yes
No
Which is
broken, C,D (Indoor 1) Or C,D
(Indoor 2)
C,D (Inddor 1)
C,D
(Inddor 2)
Switching power circuit for indoor 2
P.W.B. could be defective.
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