Lincoln 1629-000-A Intermittent heating, Thermal overload of main, fan motors, Conveyor will not

	Intermittent heating	Thermal overload of main	The main fan motors are equipped with internal
		fan motor(s)	thermal protection and will cease to operate if
			overheating occurs. As the motors overheat and then
			cool, this will cause the units to cycle on and off
			intermittently. Improper ventilation or lack of
			preventive maintenance may cause this problem.
			Also, most of the problems listed under “Oven will not
			heat” can cause intermittent failure.
	Conveyor will not	Power supply	Check for supply voltage at terminals L1 and L2. If
	run		voltage is not present check breakers.
		Power switch	Check continuity between switch terminals. Replace
			switch as needed.
		Fuse, 10 Amp.	Check and/or replace.
		Fuse holder	Check and/or replace.
		Hi-limit thermostat(s),	Check for voltage on both sides of the switch.
		control box	Terminals are normally closed. If open, reset and test
			for proper operation. If thermostat will not hold, and
			the control box temperature is not exceeding 140°F
			(60°C), replace thermostat.
		Relay, oven control	Check for line voltage 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. Replace relay as needed.
		Control transformer	Check for line voltage 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 24VAC at the transformer
			secondary. If there is primary voltage, but no
			secondary voltage, replace control transformer.
		Conveyor motor	Check for line voltage supply to the conveyor motor at
			wire #28 to neutral. If no voltage is present, trace
			wiring back to the oven power relay. 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 - 116 ohms
			Grey to brown - 116 ohms
			Brown to black - 230 ohms
		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 supply voltage to the motor. And the motor,
			capacitor, and reversing switch check good, replace
			the oven control.
	Conveyor motor	NOTE: Display will indicate
	runs, but there is	“Belt jam”
	no speed display	Oven control	Check for output voltage from the 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.
Low Profile – 1600 Series Adv Dig Electric S.M. – Int’l			7