Electronic Troubleshooting; Models Rx256Dtx1, Rx256Et2B1, Rx256Et2W1 - Fisher & Paykel RX256DT4X1 FP Service Manual

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9

ELECTRONIC TROUBLESHOOTING

9.1

Models RX256DTX1, RX256ET2B1, RX256ET2W1

Table A: Harness 10-pin Connector Configuration
Pin Colour
10 BU
9 OR
8 BR
7 YL
6 RD
5 PK
4 GY
3 BK
2
1 WH
Note: All voltage measurements are referenced to line neutral or pin 1 (WH wire) of 10-pin connector.
Symptom Possible Cause
No LED lit. Switch failure in
freezer door.
Incorrect harness
wiring.
No power to the
PCB.
No dispenser light No continuity.
when main or
Water dispenser
switch is pressed in Failed light bulb or
Water, Crush or Ice PCB.
Mode.
Dispenser light is Failed main
on without pressing dispenser switch
the main or Water (failed short)
switch in Water,
Crush or
Ice Mode. Failed PCB
Water LED is Failed main
illuminated but dispenser switch
does not dispense (failed open)
water when main
dispenser switch is
pressed.
No continuity
Signal
Crushed
Cubed
Dispenser Light
Water Valve
Line Out
Main Actuator
Ice Door Chute Solenoid
Line In
Neutral
With unit powered, open freezer door. Press
freezer door switch in. If freezer light does not
turn off, switch is defective.
Verify wire colour on 10-pin connector. Refer to
Table A above.
With unit powered, measure voltage between pin 1
(WH wire) and pin 3 (BK wire) of 10-pin connector.
Meter should read 120VAC.
Disconnect power. Measure continuity between
pin 8 (BR wire) of 10-pin connector and dispenser
lamp terminal.
With unit powered, press the Main dispenser
switch. Measure voltage on pin 8 (BR wire) of 10-
pin connector. Voltage should read 120 VAC.
Disconnect power. Remove both leads from the
switch and measure resistance across switch
terminals. Resistance should read less than 1 Ω
in this position and higher than 10 MΩ when
switch is open.
With PCB powered, measure voltage on pin 10
(BU wire) of 10-pin connector. Voltage should
read 0 VAC.
Disconnect power. Remove both leads from the
switch and measure resistance across switch
terminals. Resistance should read less than 1 Ω
in this position and higher than 10 MΩ when
switch is open.
Disconnect power. Remove the cover of freezer
door hinge located on top of the unit and
disconnect the connectors. Check pin 9 (OR wire)
of 10-pin connector for continuity.
70
Test Procedure Repair
Replace switch.
Correct wiring.
Replace PCB if
meter reads
120VAC.
Repair open
connection.
Replace dispenser
light bulb if voltage
reads 120 VAC.
Replace switch
Replace PCB.
Replace switch.
Repair open
connection.