Viking VDB325 - Control Board Diagnostics; Control Board Test Point Measurements

© 2011 Viking Preferred Service
20
Service Diagnostics and Procedures
Control Board Test Points
The unit has a control board that controls the functions of the dishwasher. Components can be diagnosed via
the control board. With the control board accessed (see Control Board Disassembly procedure, page 43), the
following can be measured:
Component Control Board Test Point Readings (Typical)
Door Switch P4-1 (Red/White) – P4-2 (Yellow)
0 їdoor closed
 ї door open
Start Switch Red – Black Light illuminates blue
Start Switch Red – White 0 їswitch pressed
 ї switch not pressed
Dispenser P4-1 (Red/White) – P4-4 (Orange) 14.8 ї
Three-Phase Wash Motor Motor Controller Board 15 їbetween Red and White, Red
and Blue and Blue and White.
Water Valve P6-3 (Blue) – P10-1 (White)
1.1K ї
Drain Pump P6-4 (Brown) – P10-1 (White) 30.6 ї
Diverter (Motor) P6-2 (Gray) – P10-1 (White)
2.7K ї
Diverter (Switch) P6-5 (Yellow) – P10-1 (White) Switch closed – 0 1
Switch open – '
Moisture Sensor P8-1 (Red/White) – P8-2 (Purple)
175K ї
Temperature Sensor P8-3 (Black/White) – P8-4 (Blue)
47K ї#ÇÇÂÊÛ>ÀiÃÊL>Ãi`ÊÊÌi«®
Pressure Sensor P8-6 (Brown) – P8-3 (Black/White) 5 volts DC input
0.5–3.5 volts DC output
Water Heater P12 (Gray) – P10-1 (White)
12.00 ї
Drying Motor (450 only) P7 Red – P7 (Blue)
.ї
Drying Heater (450 only) P6-1 (Orange) – P10-1 (White)
ї
Vent Door (450 only) P4-1 (Red/White) – P4-3 (Brown)
ї
Power On Light P8-5 (Green) – P8-7 (Brown) 5VDC