Hitachi RAC-25JX4, Service Manual

Page: 100 / 119

Ð 105 Ð
LD301
blinks
12
times.
Fan
lock
error
.
Is
CN24
connected?
Is
the
propeller
fan
locked? Have
the
1A
fuse
and
R107
blown?
Is
+15V
being
generated?
Check
voltage
both
between
CN18
4
and
5
on
the
control
P.
W
.B.,
and
between
+15V
and
15-0V
(silk-screened)
on
the
power
P.
W
.B.
Ifno
output
voltage
is
present
on
the
power
P.
W
.B.
side,
replace
the
power
P.
W
.B.
Is
the
fan
operating?
(An
error
occurs
after
the
fan
operates
for
2
minutes.)
Is
the
voltage
between
4
and
6
at
CN24
normal
?
(Normally
,the
voltage
is
above
approx.
DC1.7V
.)
Connect
the
connector
.
Remove
any
obstructions. Replace
the
fan
motor
and
control
P.
W
.B.
Is
the
voltage
between
4
and
7a
tCN24
normal
?
Check
to
see
ifthe
voltage
is
within
2.5V
±
0.5V
using
a
tester
.
(In
eff
ect,
the
output
voltage
is
alternately
switched
between
5V
and
0V
.)
Replace
the
control
P.
W
.B
.
Replace
the
fan
motor
.
Ye
s
No
No No Ye
s
No
No
No
No
No
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
※