Electronic Testing - Viking VCBB360R Service Manual

Electronic Testing

Electronic Testing Mode
Forced Defrost Start
1. Press Display On pad to activate control
panel.
2. Simultaneously press and hold Max Ref and
Display Off pads for 3 seconds.
Forced Compressor Start
1. Press Display On pad to activate control
panel.
2. Simultaneously press and hold Max Frz and Display Off pad for 3 seconds.
Open Thermistor Detect
Alarm sounds and freezer or refrigerator
indicator light shows and temperature indicators
4 through 7 will turn on in sequence if either
thermistor circuit opens. Refer to Temperature
Control Operation Section and Electronic
Testing Section.
1. Press Alarm Off pad to turn off alarm.
2. Alarm will retest for normal operation.
If condition has not
alarm will sound again.
Evaporator Fan Suppression
The evaporator fan will turn off every time
either refrigerator or freezer door is open.
To test if this function is operating:
1. Perform forced pull down procedure as
noted above--evaporator fan should be
on.
2. Open the refrigerator or freezer door--
the fan should turn off.
3. Push the light switch off-the evaporator
fan should start.
If fan does not toggle off and on when
refrigerator light switch is turned off and on it
has been determined evaporator fan motor
operational, perform
determine failure:
been corrected,
following tests to
1. Check for line voltage on terminal E7 on
high voltage board. With refrigerator
door open (refrigerator light ON)
reading should be 120-VAC. With door
closed (refrigerator light OFF) reading
should be approximately 0 VAC.
voltage
switch and light is turning light off and
on red/white wire is broken between
switch and high voltage board.
2. Check for voltage on terminal E7 on
high voltage board. Output voltage
should toggle
switch.
toggle,
replacing.
3. If terminal 7 on high voltage board
changes with opening and closing of
door, orange wire in
harness is broken (check for continuity
between pin 7 on high voltage board and
pin 10 on low voltage board) or low
voltage board
1. Check for line voltage on terminal E8 on
high voltage board.
open, reading should be 120VAC. With
door closed,
approximately 0 VAC. If voltage does not
change with light switch and light switch is
turning light off and on, violet/white wire is
broken between switch and high voltage
board.
2. Check for voltage on pin 7 on pin
connector of high voltage board. Output
voltage should
light switch. If it does
voltage board needs replacing.
3. If voltage on pin 7 on pin connector on high
voltage board changes with opening and
closing of door, orange wire in low
voltage harness is
continuity between pin 7 on high voltage pin
connector and pin 10 on low voltage board)
or low voltage board needs replacing.
11
does not change with light
with toggling of light
If output voltage does not
high voltage board
low
needs replacing.
With freezer door
reading should
toggle with toggling of
not toggle, high
broken (check
If
needs
voltage
be
for