Samsung WF520ABP/XAA, WF520ABW/XAA Fast Track Troubleshooting
# tsWF520 RevB 03/21/2011 1
Fast Track Troubleshooting
Model:
WF520ABP/XAA
WF520ABW/XAA
Publication # tsWF520 Revision Date 03/21/2011
Quick Test Mode
To enter press Spin, Soil, & Power simultane-
ously with the power off.
1. All LED’s light up and the washer beeps as it
enters the Quick Test Mode.
2. After the displaying the software version, LCD
will display Model information. If EEEE is displayed
the PCB ass’y is defective.
4. When the version is displayed, turn the Jog-Dial
CCW so that the version disappears. Press the following keys to test the various components:
Press Temp Key to cycle through the Water Valves
circuit test (lock the door first) in this order: Pre-Wash,
Bleach, Cold Main, Hot, & Steam, then off.
Press Spin Key to test Door Lock/Unlock circuit
Press Steam Level Key to test Circulation/Drain Pump.
Press Soil Key to test the Water/Steam Heater.
When either Test or Spin is displayed on the LCD,
press Start/Pause key to conduct the motor test.
In Test mode, you can test the clockwise and counter-
clockwise movement of the motor. In Spin mode, you
can test the motor at a high rpm.
Service Mode:
This mode allows more detailed operation tests and troubleshooting, to enter press Signal & Extra Rinse
simultaneously with the power on.
While in Service Mode the following tests can be performed:
Quick Spin Test = Delay Start & Extra Rinse: This accelerates the drum motor from 0 to maximum RPM over a few
minutes. Note: Stay with the washer during this test, out of
balance detection may be bypassed. Press the Start/Pause
button during the test to hold its spinning speed for 10 minutes
before going back to Quick Spin Test Mode. Press and hold the
Delay Start & Extra Rinse button to continue.
Cycle Count = Press Signal button to see # of times used.
Soft Ware # = Press Soil button to see software version info.
Fault Code Test = Press the Spin button to view the stored fault
codes – then turn Jog Dial to view error codes (Push Start/
Pause while the code is displayed to view the number of cycles
since the error occurred, Push Start/Pause to go back to faults)
Peripheral (Main PCB) input Tests
1. Select Extra Wash. Then turn the Jog-Dial so that the Heavy
Duty LED is turned on. Next, press the Start/Pause Key. The
Water Temperature will be displayed in Fahrenheit.
2. Select Extra Wash. Then turn the Jog-Dial so that the Perma-
nent Press LED is turned on. The door status will be displayed
(OP if open, CL if closed).
3. Select Extra Wash. Then turn the Jog-Dial so that the Sani-
tize LED is turned on. The door lock Switch status will be dis-
played (UL if unlocked, Lo if locked).
4. Water Frequency/Water Sensor Testing - Select a cycle &
start the washer, enter Service Mode & press Extra Wash.
Turn the Dial so that the Bedding LED is turned on. Next, press
the Start/Pause Key. The Water Frequency will be displayed.
The frequency will change as the unit fills.
IMPORTANT SAFETY NOTICE – “For Technicians Only” This service data sheet is
intended for use by persons having electrical, electronic, and mechanical experience
and knowledge at a level generally considered acceptable in the appliance repair trade.
Any attempt to repair a major appliance may result in personal injury and property
damage. The manufacturer or seller cannot be responsible, nor assume any liability for
injury or damage of any kind arising from the use of this data sheet.
EEPROM Clear Check
Power off, Press Delay Start, Signal and Power Key at
the same time. Good = Good Fail = FAiL
All memory will be cleared, including Fault Codes
This should be done when a new Main PCB is installed
SUPPORT INFORMATION
Training — Plus One http://my.plus1solutions.net/clientPortals/samsung/
Help — GSPN http://service.samsungportal.com/
Samsung Product Support TV http://support-us.samsung.com/spstv/howto.jsp
Customer information videos and chat programs. Programs for Fridges, Laundry, Ranges & D/W
# tsWF520 RevB 03/21/2011 2
CN8
CN7
CN6
CN10
CN1
CN3
CN6
CN2
RY1
RY11
RY13
To MEMS
connector
on Main
PCB CN11
To MEMS
connector
on outer
tub
CN11
PNK
BLU
YEL
RED
VIO
WHT
ORG
Door Ck Sw
Thermistor
CN7
# tsWF520 RevB 03/21/2011 3
Washer Connector Checks WF520
CN1
1 Door Lock Close (Blk)
2 Door Lock Open (Wht)
3 Drain Pump (Vio)
4 Steam Valve (Brn)
5 Bleach Valve (Pnk)
6 Bubble Pump (Gry)
7 Pre Valve (Yel)
8 Main Valve (Blu)
9 Hot Valve (Red)
CN6
1 AC Pwr (L1) (Blk)
2 Door Lock Detection (Gry)
CN7
1 Reactor Connector Port (Red)
2 Reactor Connector Port (Red)
RY11 Steam Htr Relay
1 Heater (Wht)
2 L1 (Blk)
RY1 Power Relay
1 (Blu)
2 (Wht)
RY13 Washer Htr Relay
1 L1 (Blk)
2 Heater (Red)
CN8
1 Motor Pwr U Phase (Red)
2 Motor Pwr V Phase (Wht)
3 Motor Pwr W Phase (Blu)
CN3 (Hall Sensor)
1 +5 vdc (Pnk)
2 Sensor Signal (Red)
3 Sensor Signal (Blu)
4 Ground (Org)
CN11 Mems Boards
1 3.3vdc (Red)
2 Chip Select 1 (Yel)
3 Chip Select 2 (Vio)
4 Output Signal (Blu)
5 Input Signal (Wht)
6 Clock Signal (Pnk)
7 DC Common (Org)
CN10
1 Tx Disp pcb(Vio)CN7 2 Rx Disp pcb(S/Blu)CN7
3 Reset Signal Disp(Pnk)CN7 4 5vdc (Brn) CN7
5 DC Common (Org) CN7 6 15vdc (Blk)
7 Main Reset (Yel) 8 Water Level (Blu)
9 Watchdog Signal (Wht)
Steam Heater Relay Check Test 1 Test 2
Connector CN6 Pin 2 (Gray) and RY11 (heater relay) Pin 1 (White)
120VAC with the Heater On and 0VAC
with the Heater off
Power Off, heater resistance is
15.6 Ω
Heater Relay Check Test 1 Test 2
Connector CN6 Pin 2 (Gray) and RY13 (heater relay) Pin 2 (Red)
120VAC with the Heater On and 0VAC
with the Heater off
Power Off, heater resistance is
16.6 Ω
Hall Sensor Check Test 1
Test 2
Connector CN3 Pin 4 (Orange) and Pin 2 (Red) additionally Pin 4 (Orange) and Pin 3 (blue)
Manually spin the drum to see the voltage change, Power On
N/A
0Vdc or 3.75Vdc
Motor Check Test 1
Test 2
Connector CN8 Pin 1 (Red), Pin 2 (White) and Pin 3
(Blue)
Power Off 11.5Ω across Pins 1-2, Pins 1
-3, & Pins 2-3
N/A
A/C Power Check Test 1
Test 2
Connector CN 6 Pin 1 (Black) and RY1 Pin 1 (Blu) Power On 120VAC N/A
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