Check SiENBE05-722_A
110 Service Diagnosis
4.1.11 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.
If NG in step 1 Æ Defective PCB Æ Replace the PCB.
If NG in step 2 Æ Defective Hall IC Æ Replace the fan motor.
If OK in both steps 1 and 2 Æ Replace the PCB.
The connector has 3 pins.
4.1.12 Main Circuit Short Check
Check No.29
Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
Measure the resistance between the pins of the DB1 as below.
If the resistance is ∞ or less than 1 kΩ, short circuit occurs on the main circuit.
RK(X)S25/35E2V1B models
1
Gray (power supply)
Purple (signals)
Blue (grounding)
2
3
(R1990)
(–) terminal of the tester
(in case of digital,
(+) terminal)
~ (2, 3) + (4) ~ (2, 3)
– (1)
(+) terminal of the tester
(in case of digital,
(–) terminal)
+ (4) ~ (2, 3)
– (1)
~ (2, 3)
Resistance in OK
several kΩ
~ several MΩ
∞∞
several kΩ
~ several MΩ
Resistance in NG 0 Ω or
∞ 000 Ω or ∞
(R12412)
–~~+
1234
+
–
Tester
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