Door Lock Assembly; Testing Lock Motor; Testing Latch Switches - Viking DSOE301SS Service Manual

Service Diagnostics and Procedures
Control 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
control board.
P15
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).
S1 S1
Door Interlock
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 light
brown wire and blue/white. This signals the board
that the door is unlocked.
© 2010 Viking Preferred Service
P15
S2
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 light 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, page 50).

Testing Latch Switches

To check the latch switches, access the control
board and unplug the P15 Molex plug. With the
door in the unlocked position, you should read
continuity between the light brown wire and the
blue/white wire and zero (0)
brown wire and the blue/white. If your readings are
incorrect or reversed, remove the latch and inspect,
repair/replace (see Lock Motor Disassembly,
page 50).
. If no resistance is
Ω
between the light
Ω
37