Hall Ic Check; Main Circuit Short Check - Daikin FLKS25BAVMB Service Manual

Check

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.
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.
(–) terminal of the tester
(in case of digital,
(+) terminal)
(+) terminal of the tester
(in case of digital,
(–) terminal)
Resistance in OK
Resistance in NG
RK(X)S25/35E2V1B models
110
∗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.
1
2
3
~ several MΩ
1 2 3 4
– ~ ~ +
Tester
Gray (power supply)
Purple (signals)
Blue (grounding)
~ +
(2, 3) (4)
+ ~
(4) (2, 3)
several kΩ
∞
∞
0 Ω or
0
SiENBE05-722_A
(R1990)
–
~
(1)
(2, 3)
– ~
(1)
(2, 3)
several kΩ
∞
~ several MΩ
∞
0 Ω or
0
(R12412)
Service Diagnosis