Check
SiSG121917E
171
Part 6 Service Diagnosis
Check No.24
1. Turn the power supply OFF.
2. With the fan motor connector disconnected, measure the resistance between each pin, then
make sure that the resistance is more than the value mentioned in the following table.
8.3 Hall IC Check
Check No.04
1. Check the connector connection.
2. With the power ON, operation OFF, and the connector connected, check the following.
(1) Output voltage of about 5 V between pins 1 and 3.
(2) Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
If NG in step (1)
Defective PCB
Replace the PCB (control PCB).
If NG in step (2)
Defective Hall IC
Replace the fan motor.
If OK in both steps (1) and (2)
Replace the PCB (control PCB).
Measuring points
Judgement
White - Blue
1 M
or more
Orange - Blue
100 k
or more
Brown - Blue
100
or more
Red - Blue
100 k
or more
W
hite
Orange
Bro
w
n
Bl
u
e
—
—
Red
FG
Vsp
Vcc
G
N
D
—
—
Vdc/Vm
1
Gray (po
w
er s
u
pply)
P
u
rple (signals)
Bl
u
e (gro
u
nding)
2
3
(R14211)
S7
