Daikin J Series Service Manual page 122

Check
5.1.10 Power Module Check
Check No.13
Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
Resistance in OK
Resistance in NG
5.1.11 Rotation Pulse Check on the Outdoor Unit PCB
Check No.15 <Outdoor fan motor>
1. Check that the voltage between the pins 10-11 is 15 VDC.
2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10-
112
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
Follow the procedure below to measure resistance between the terminals of the DB1 and
the terminals of the compressor with a multi-tester. Evaluate the measurement results for a
judgment.
12, 10-13, when the fan motor is manually rotated once.
13
12
11
10
9
8
7
6
5
4
3
2
1
DB1 (+) UVW
UVW DB1 (+)
several kΩ ~ several MΩ
S70
HV (Hall IC)
HU (Hall IC)
15 VDC
Free pin
Free pin
Phase W
Free pin
Free pin
Phase V
Free pin
Free pin
Phase U
DB1 (–)
UVW DB1 (–)
0 Ω or ∞
(R11907)
Service Diagnosis
SiBE041012
UVW