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Low Profile – 1600 Series Advantage Digital Service Manual – Domestic
8
Hi-limit thermostat(s),
control box
Check for voltage on both sides of the switch. Terminals are
normally closed. If open, reset and test oven for proper
operation. If thermostat will not hold, and control box
temperature is not exceeding 140°F (60°C), replace thermostat
Relay, oven power Check for 120 VAC to the relay coil. If voltage is not present,
Trace wiring back to the hi-limit thermostat. If voltage is present,
check to insure contacts are closing. Check for 120 VAC
supplied to terminal #2 of the relay. If voltage is not present at
terminal #2, trace wiring back to the 10 Amp fuse. Replace relay
as needed.
Control transformer Check for 120 VAC supply to the primary of the control
transformer. If no voltage is present, trace wiring back to the
oven power relay. If voltage is present, check for 24 VAC at the
transformer secondary. If there is primary voltage but no
secondary voltage, replace control transformer.
Conveyor motor Check for 120 VAC supply to the conveyor motor at wire #14 to
neutral. If no voltage is present, trace wiring back to the primary
of the control transformer. If voltage is present and the motor will
not run, check the motor windings for opens or shorts.
WITH POWER OFF: Check the motor windings as follows:
Grey to black - 38Ω approx.
Grey to blue - 38Ω approx.
Blue to black - 75Ω approx.
If any of the above fails, replace conveyor motor.
Capacitor, conveyor
motor
Check for shorts or grounds. Replace capacitor as needed.
WARNING: Capacitor has a stored charge, discharge before
testing.
Switch, conveyor
reversing
Check continuity between switch terminals. Replace switch as
needed.
Oven control If there is 120VAC supplied to the motor, and the motor,
capacitor, and reversing switch check good, replace the oven
control.
Conveyor motor runs,
but there is no speed
display
NOTE: Display will
indicate “Belt Jam”
Oven control Check for output voltage from oven control to hall effect sensor
(sensor is located in conveyor motor). Measure voltage at the
motor connector, red wire and yellow wire. Voltage should be
approx. 10VDC. If no voltage is present, trace wiring back to
oven control. If there is no voltage present at the oven control,
replace the oven control.
Conveyor motor If there is voltage supplied to the hall effect sensor, check for a
frequency output from the hall effect sensor. Measure frequency
across the yellow and white wires at the motor connector.
Frequency reading should be approx. 25 – 100 Hz. If these
readings are not achieved, replace conveyor motor. If the
readings are achieved, proceed.
Oven control If the hall effect sensor readings are correct, but there is no
speed indicated on the display, replace the oven control.