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S/N 2011383 and above REFER TO PAGE 45
Temp. Display out or inaccurate REFER TO PAGE 33
S/N 2011383 and above REFER TO PAGE 45
STEPPER MOTOR DRIVE
Conveyor will not run Conveyor Switch Check for 120 VAC to conveyor switch. If no
voltage is present, trace wiring back to the oven power source.
WITH POWER OFF: Check conti nuity between switch terminals.
Conveyor Fuse 3AMP Check, replace if necessary. (Not used on
Model 1151)
Fuseholder Check, replace if necessary.
Conveyor Control Check for 120 VAC supply to primary
(Stepper) Transformer of transformer, if voltage is not
present, trace wiring back to the fuseholder.
If voltage is present, check for output voltage
from the transformer secondary. NOTE: This
control transformer outputs (2) secondary voltages.
Red Leads 29 VAC
Brown Leads 10 VAC
If BOTH secondary voltages are not
present, replace the transformer.
Speed Adjustment This is a 0 to 50k ohm, 10 turn
Potentiometer potentiometer WITH POWER OFF: remove the 3
pin potentiometer cable plug from the motor
control board. With a digital multimeter, check
the ohm reading across the red lead to the black
lead, this reading should be 50k ohms ± 5% as
the potentiometer is rotated through its
10 turn rotation. Place the meter leads
on the red lead and white lead. Rotating
the potentiometer slowly, from low to
high, the meter should show an even
transition from 0 to 50k ohms ± 5%
through the 10 turn rotation of the
potentiometer. There should be no dead
or open spots through the 10 turns of
the potentiometer. Check all three leads
to ground. There should be no continuity
to ground.
If any of the above checks fail, replace
the potentiometer.
Conveyor Motor NOTE: if the conveyor drive motor
(Stepper) Control becomes jammed, the motor will stop
turning. To reset, turn off conveyor
switch, wait 10 seconds and turn the
conveyor switch on.
If the motor does not run, check for
2 to 29 VAC across the motor
terminals 1 to 2 and 3 to 5 on the
conveyor motor control. If voltage is not
Impinger II - 1100 Series Service Manual - International44