Checks
SiBE04-101
124
Service Diagnosis
5.1.8
Fan Motor Connector Output Check
Check No.16
1. Check the connector connection.
2. With the power ON, operation OFF, and the connector connected, check the following.
∗
Output voltage of about 5 V between pins 1 and 3.
∗
Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
Failure of (1)
faulty PCB
Replace the PCB.
Failure of (2)
faulty hall IC
Replace the fan motor.
Both (1) and (2) result
Replace the PCB.
The connector has 3 pins, and there are two patterns of lead wire colors.
5.1.9
Rectifier Check
Check No.17
There are several different terminal position patterns. Therefore, be sure to check the terminal marks.
Negative (
–
) terminal of tester (positive
terminal (
+
) for digital tester)
~
+
~
–
Positive (
+
) terminal of tester (negative
terminal (
–
) for digital tester)
+
~
–
~
Normal resistance
Several K
Ω
to M
Ω ∞
∞
Several K
Ω
to M
Ω
Unacceptable resistance
0 or
∞
0
0
0 or
∞
+~~
–
Brown
Blue
Yellow
Purple
(R1080)
P.C. Board
Diode bridge
+
~
~
–
SiBE04-101.book Page 124 Monday, October 15, 2001 3:08 PM