SiENBE04-512A Check
Service Diagnosis 137
5.1.11 Hall IC 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) Æ faulty PCB Æ Replace the PCB.
Failure of (2) Æ faulty Hall IC Æ Replace the fan motor.
Both (1) and (2) result Æ Replace the PCB.
Gray (power supply)
Purple (signals)
Blue (grounding)
1
2
3
(R1968)
SiENBE04-512A.book Page 137 Friday, October 5, 2007 1:49 PM
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