Relay Board Diagnosis - Viking RDSOE306SS Service Manual

Service Diagnostics and Procedures

Relay Board Diagnosis

Door Lock Assembly
The door lock motor is a 120 volt motor. One side
of the motor is wired directly to the main neutral
terminal block. L1 power to the lock motor is
connected on the P15 connector (DL) on the main
relay board.
When the door is required to lock or unlock, the K3
relay energizes and sends line voltage to the door
lock motor.
The position of the door lock motor is monitored by
the S1 and S2 door interlock switches connected to
P15 shown below (right).
There are three micro switches mounted on the door
lock assembly. One switch is not used on this model.
The photo above shows the latch assembly lifted
upwards to expose the switch positioning.
When the door is in the unlocked position, the cam
is depressing the S1 switch plunger. The N.O. switch
contact is closed and a completed circuit is made
at the P15 connection between the brown wire and
blue/white. This signals the board that the door is
unlocked.
© 2012 Viking Preferred Service
S2 is also N.O. and is open when the door is
unlocked. When the lock motor is activated and
begins to lock, the S1 contact opens. When the
plunger catches the door liner and pulls inwards, the
S2 switch plunger is actuated. The switch contact is
closed and a completed circuit is made at the P15
connection between the brown wire and orange.
This signals the board that the door is locked. When
it is time to unlock the door, power is sent to the door
lock motor and it continues its rotation. The plunger
releases the door liner and opens the contact on S2.
When the door is fully opened, S1 is closed by the
motor cam. This will signal the board that the door is
unlocked.
Testing Lock Motor
With the Molex connector removed from the P12
board connection, use an Ohm meter to measure
resistance between black/white wire in the Molex
plug and the neutral terminal block. The resistance
should be approximately 12.3K
read, remove the latch motor to repair or replace as
necessary (see Lock Motor Disassembly).
Testing Latch Switches
To check the latch switches, access the relay board
and unplug the P15 Molex plug. With the door in
the unlocked position, you should read continuity
between the brown wire and the blue/white wire
and infinite ohms between the brown wire and the
Ω
orange. If your readings are incorrect or reversed,
remove the latch and inspect, repair/replace (see
Lock Motor Disassembly).
. If no resistance is
Ω
33