Daikin SUPER MULTI NX G Series Service Manual page 167

SiUS12-928_A
6.1.14 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  Defective PCB  Replace the PCB.
If NG in step 2  Defective Hall IC  Replace the fan motor.
If OK in both steps 1 and 2  Replace the PCB.
6.1.15 Main Circuit Short Check
 Measure the resistance between pins at both ends of DB1.
Check No.29
 If the resistance is ∞ or less than 1 kΩ, the main circuit short.
(–) terminal of the tester
(in case of digital,
(+) terminal)
(+) terminal of the tester
(in case of digital,
(–) terminal)
Resistance in OK
Resistance in NG
~
Service Diagnosis
∗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.
~several MΩ
+
DB1
~
–
S7
Gray (power supply)
1
2 Purple (signals)
3 Blue (grounding)
(~) (+)
(+) (~)
several kΩ
∞
∞
0 or 0
S40 S80
S90 S92 S93
S20 S21 S22
(R11690)
(R12398)
(~)
(–)
several kΩ
∞
~several MΩ
0 0 or
Check
(–)
(~)
∞
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