Lincoln 1981, 1982, 1962 Service Manual
SERVICE MANUAL
(DOMESTIC & INTERNATIONAL)
DUAL TECHNOLOGY FINISHER
MODEL 1960 & 1980 SERIES
Lincoln Foodservice Products, LLC
1111 North Hadley Road
Fort Wayne, Indiana 46804
United States of America
Telephone: (260) 459-8200
U.S. Fax: (888) 790-8193
Int’l Fax: (260) 436-0735
Service Hotline: (800) 678-9511
www.lincolnfp.com
DTF1960and80serv REV: 1/16/07
SEQUENCE OF OPERATION
DUAL TECHNOLOGY FINISHER
1961 120/208VAC 60 HZ. 3 PHASE
1962 120/240VAC 60 HZ. 3 PHASE
1981 120/208VAC 60 HZ. 3 PHASE
1982 120/240VAC 60 HZ. 3 PHASE
NOTE: DTF must be placed on an oven stand for approved operation. No other surface may be
used for operation.
POWER SUPPLY Electrical power to be supplied to the oven by a five conductor service for three phase.
Black conductor is hot.
Red conductor is hot.
Orange conductor is hot.
White conductor is neutral.
Green conductor is ground.
MAIN FAN CIRCUIT Power is permanently supplied to the normally open main heater relays, the upper and
lower IR relays, the oven control, and, through the 10 A. motor and control fuses, to the
normally open main fan relay. Power is also supplied through a normally closed hi-limit
thermostat to terminal number 1 of the 30 minute cool down timer, and to the main
power switch. Closing the main power switch enables the 30 minute cool down timer.
The 30 minute cool down timer supplies line voltage to the coil of the main fan relay, its
contacts now close, supplying 208/240VAC to the main fan motor. Voltage is also
supplied to the primary of the control transformer, the conveyor motor, the oven control.
TEMPERATURE CONTROL Closing the main power switch supplies 208/240VAC to the primary of the control
transformer. Secondary voltage, 24VAC, is supplied to the oven control. The oven
control is set to desired temperature. The thermocouple will provide varying millivolts to
the oven control. The oven control supplies voltage to the coil of the heater relays at
intermittent intervals to maintain the desired temperature. The display on the oven
control will indicate when the main heater relay is energized.
NOTE: The display also indicates oven temperature.
INFRARED HEAT Adjusting the oven control will allow up to four infrared elements to be operated. The
control will energize the required relays, supplying 208/240VAC to the infrared heaters.
CONVEYOR DRIVE Closing the main power switch supplies 208/240VAC to the conveyor motor and to the
primary of the control transformer. Secondary voltage, 24VAC, is supplied to the oven
control. Setting the oven control to the desired time, outputs voltage, through a
reversing switch and capacitor, to the conveyor motor.
AUTOMATIC COOL DOWN When the machine is started, the time delay relay timing circuit is enabled, permitting
the main fan to operate for approximately 30 minutes after the machine is shut off, to
cool the machine. The 30-minute time delay relay will keep the coil of the main fan relay
energized, maintaining operation of the main fan motor for 30 minutes.
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SCHEMATIC DIAGRAM
DOMESTIC MODELS
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SCHEMATIC DIAGRAM
EXPORT MODELS
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TROUBLESHOOTING GUIDE
1961 120/208 VAC 60 HZ. 3 PHASE
1962 120/240 VAC 60 HZ. 3 PHASE
1981 120/208 VAC 60 HZ. 3 PHASE
1982 120/240 VAC 60 HZ. 3 PHASE
SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run Incoming power supply Check circuit breakers. Reset if required. Call power
co. if needed.
Fuses, 10 Amp, motor and
controls
Fuse holder Check, replace if necessary.
Hi-limit thermostat,
Oven cavity
Switch, main power Check continuity between switch terminals. Replace
30 minute time delay relay Check for supply voltage to 30 minute time delay relay
Relay, main fan Check for supply voltage to relay contacts, if no voltage
Main fan motor Check for supply voltage at motor. If no voltage is
Capacitor Check for shorts or grounds.
Oven will not heat Main fan motor Check for main fan operation. If it is not operating, refer
Control transformer Check for 208/240VAC supply to the primary of the
Oven control Check for 24VAC supply to control. If no voltage is
Check, replace if necessary.
Terminals are normally closed. If open, reset
thermostat and retest. If thermostat will not hold for
maximum oven temperature, and oven is not exceeding
temperature setting, check for proper location of
capillary bulb in its spring holder. If the capillary checks
okay, replace the hi-limit thermostat.
switch as needed.
at terminals #1 and #6. If no voltage is present, trace
wiring back to main power switch. If there is supply
voltage at terminals #1 and #6, check for output voltage
at terminals #2 and #3. If there is incoming voltage but
no output voltage, and the main power switch is on,
replace the 30 minute time delay relay.
is present, trace wiring back to power supply. Check for
supply voltage to the coil of the main fan relay. If no
voltage is present, trace wiring back to the 30 minute
time delay relay. If voltage is present, check to insure
contacts are closing. Replace as needed.
present, trace wiring back to circuit breakers.
WITH POWER OFF: Check for opens, shorts or
grounds. Turn fan blade to check for locked rotor.
WARNING: Capacitor has a stored charge, discharge
before testing.
to “Oven fan will not run”.
control transformer. If no voltage is present, trace
wiring back to the main power switch. If voltage is
present, check for 24VAC at the transformer
secondary. If there is primary voltage, but no secondary
voltage, replace the control transformer.
present, trace wiring back to control transformer. If
24VAC is present, check for a read-out on the display.
If there is 24VAC supplied, but there is no read-out on
the control display, replace the oven control.
If there is a read-out on the control, set the control to
maximum temperature (see installation operations
manual for temperature adjustment). With the control
set at maximum temperature, check for supply voltage
DTF – 1960 & 1980 Series Service Manual
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to the oven control at terminals J3-12 and J3-3. If there
is no voltage present, trace wiring back to the air
pressure switch. If there is voltage present, check for
output voltage at the Main heater relay (R1). If there is
voltage at the Main heater relay, proceed to “Main
heater relay” for next check. If there is no voltage at the
Main heater relay, trace wiring back to the oven control.
If there is no voltage output at the oven control, check
the read-out on the control. If the control reads
“PROBE FAIL”, this indicates that the thermocouple
has failed or become disconnected from the oven
control.
Thermocouple Check to be sure that the thermocouple is securely
connected to the oven control. If the thermocouple is
connected to the oven control, and the control indicates
“PROBE FAIL”, disconnect the thermocouple from the
oven control and measure the resistance of the
thermocouple. The thermocouple should read approx.
11Ω. If these readings are not achieved, replace the
thermocouple. If these readings are correct, proceed.
Oven control If the thermocouple checks good, but the oven control
display indicates that there is a thermocouple failure,
replace the oven control. If the oven control indicates a
temperature reading but the oven will not heat,
proceed.
Thermocouple WITH POWER ON AND THERMOCOUPLE
ATTACHED TO THE OVEN CONTROL: Measure the
DC millivolt output of the thermocouple. Refer to the
thermocouple chart (located in the “Removal” section of
the manual) for proper millivolt readings. If these
readings are not achieved, replace thermocouple.
Oven control If the thermocouple checks good, but there is no
voltage output to the Main heater relay, replace the
oven control. If there is voltage output to the Main
heater relay, proceed.
Main heater relay Check for supply voltage to the relay coil. If voltage is
present and the relay will not activate, replace the Main
heater relay. Also check each relay contact for high
voltage input and output.
Heating element(s) Check the Amp draw on each power leg for proper
load. Check the specification plate for rating
information. If the amp draw is high or low, check the
individual elements for opens, shorts and proper
resistance.
WITH POWER OFF: To check resistance of the
elements, remove all leads from the elements and use
a digital multimeter.
The element resistance should be as follows:
Circular element
120V – 7.5 ohms approx.
Side elements
120V – 14 ohms approx.
Replace heating elements as needed.
No Infrared Heating Main fan motor Check for main fan operation. If it is not operating, refer
to “Oven fan will not run”.
Infrared heater relay Check for supply voltage to the relay coil. If no voltage
is present, trace wiring back to Infrared heater switch. If
voltage is present and the relay will not activate,
replace the Infrared heater relay. Also check each relay
contact for high voltage input and output.
Infrared Heating element(s) Check the Amp draw on each power leg for proper
DTF – 1960 & 1980 Series Service Manual
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load. Check the specification plate for rating
information. If the amp draw is high or low, check the
individual elements for opens, shorts and proper
resistance.
WITH POWER OFF: To check resistance of the
elements, remove all leads from the elements and use
a digital multimeter.
The element resistance should be as follows:
208V – 45 ohms approx.
240V – 58 ohms approx.
Replace heating elements as needed.
Oven heats with switch off Main heater relay or
Infrared heater relay
The Main heater relay or Infrared heater relay has
probably failed in the closed position. If there is no
voltage to the operating coil, but there is high voltage at
the relay output, replace the heater relay.
Intermittent heating Thermal/overload of motor The main fan motor is equipped with internal thermal
protection and will cease to operate if overheating
occurs. As the motor overheats and then cools, this will
cause the oven to cycle on and off intermittently.
Improper ventilation or lack of preventive maintenance
may cause this. Also, most of the problems listed under
“Oven will not heat” can cause intermittent failure.
Conveyor will not run NOTE: Display will indicate
“Belt Jam”
Power supply Check circuit breakers, reset if required. Check power
plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if needed.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Hi-limit thermostat, oven cavity Terminals are normally closed. If open, reset
thermostat and retest. If thermostat will not hold for
maximum oven temperature, and oven is not exceeding
temperature setting, check for proper location of
capillary bulb in its spring holder. If the capillary checks
okay, replace the hi-limit thermostat.
Switch, Main Power WITH POWER OFF: Check continuity between switch
terminals. Replace switch as needed.
Control transformer Check for supply voltage 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 supply voltage to the conveyor motor. 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 - 236 ohms approx.
Grey to brown - 236 ohms approx.
Brown to black - 472 ohms 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.
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Oven control If there is supply voltage to the motor, and the motor,
motor capacitor, and reversing switch check good,
replace the oven control.
Conveyor motor runs, but there
is no speed display
Conveyor motor If there is voltage supplied to the hall effect sensor,
Oven control If the hall effect sensor readings are correct, but there
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.
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.
is no speed indicated on the display, replace the oven
control.
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REMOVAL, INSTALLATION AND ADJUSTMENT
DUAL TECHNOLOGY FINISHER
CAUTION!
BEFORE REMOVING OR INSTALLING ANY COMPONENT IN THE DUAL TECHNOLOGY
FINISHER, BE SURE TO DISCONNECT THE ELECTRICAL POWER SUPPLY.
MOTOR, MAIN FAN - REPLACEMENT
1. Shut off power at main breaker.
2. Remove conveyor and finger assemblies from oven (see installation operations
manual).
3. Remove front plenum assembly. Measure location of main fan on motor shaft for
reassembly. Loosen two set screws and remove main fan from motor shaft.
4. Remove rear cover. Disconnect wiring from motor. Remove motor and motor mount
assembly from back of oven.
5. Measure proper location of cooling fan on motor shaft for reassembly. Remove cooling
fan. Remove motor from motor mount.
6. Reassemble in reverse order and test for proper operation.
CAPACITOR, MAIN FAN MOTOR – REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels.
3. Discharge capacitor, disconnect wiring and remove capacitor.
4. Reassemble in reverse order and check system operation.
MAIN FAN - REPLACEMENT
See “MOTOR, MAIN FAN” above.
SWITCH, ON/OFF - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box top.
3. Depress clips on sides of switch and remove switch from front panel.
4. Disconnect all wires from switch. Mark all wires for reinstallation.
5. Reassemble in reverse order and check system operation.
RELAY, TIME DELAY - REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels.
3. Remove wires from time delay relay and mark wires for reinstallation.
4. Remove mounting screw and remove time delay relay.
5. Reassemble in reverse order and check system operation.
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RELAY, MAIN FAN - REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels.
3. Remove wires from main fan relay and mark wires for reassembly.
4. Remove mounting screws and remove main fan relay.
5. Reassemble in reverse order and check system operation.
FUSE HOLDER - REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels.
3. Remove wires from appropriate fuse holder and mark wires for reassembly.
4. Remove mounting screws from fuse holder and remove fuse holder.
5. Reassemble in reverse order and check system operation.
RELAY, MAIN HEATER – RELAY, INFRARED HEATER - REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels.
3. Remove wires from appropriate relay and mark wires for reassembly.
4. Remove mounting screws from relay and remove relay.
5. Reassemble in reverse order and check system operation.
REVERSING SWITCH, CONVEYOR - REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels.
3. Remove wires from reversing switch and mark wires for reassembly.
4. Remove mounting nut from reversing switch and remove reversing switch.
5. Reassemble in reverse order and check system operation.
TRANSFORMER, CONTROL - REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels.
3. Remove wires from control transformer and mark wires for reassembly.
4. Remove mounting screws and remove control transformer.
5. Reassemble in reverse order and check system operation.
CAPACITOR, CONVEYOR MOTOR – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box top and rear control box cover.
3. Discharge capacitor, remove wiring from capacitor and remove one mounting screw.
Remove capacitor.
4. Reassemble in reverse order and check system operation.
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CONVEYOR MOTOR – REPLACEMENT
1. Shut off power at main breaker.
2. Remove coupling from conveyor shaft (one screw at end of motor shaft).
3. Remove control box top and rear control box cover.
4. Disconnect wiring for motor and remove motor mounting screws. Remove conveyor
motor and mounting bracket.
5. Remove conveyor motor from mounting bracket.
6. Reassemble in reverse order and check system operation.
THERMOCOUPLE – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box top. Remove rear cover, open rear access panels. Remove right
side heating element cover.
3. Remove mounting screws and remove thermocouple from oven cavity.
4. Disconnect thermocouple from main control, remove thermocouple.
5. Reassemble in reverse order and check system operation.
THERMOCOUPLE MEASUREMENT
TEMPERATURE (°°°°F) D.C. MILLIVOLTS
200°°°° 2.8
250°°°° 4.0
300°°°° 5.1
350°°°° 6.0
400°°°° 7.1
450°°°° 8.2
500°°°° 9.3
550°°°° 10.4
600°°°° 11.5
THERMOSTAT, HI-LIMIT – REPLACEMENT
1. Shut off power at main breaker.
2. Remove rear cover, open rear access panels, remove right side heating element cover.
3. Remove hi-limit thermostat mounting plate. Remove hi-limit thermostat.
4. Reassemble in reverse order and check system operation. Be sure to reset thermostat
before testing.
HEATING ELEMENT, MAIN – REPLACEMENT
1. Shut off power at main breaker.
2. Remove conveyor, finger assemblies and plenum front. Remove rear cover, open rear
access panels and remove appropriate heating element cover.
3. Remove wires from heating element and mark wiring for reassembly.
4. Remove mounting screws and remove heating element.
5. Reassemble in reverse order and check system operation.
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HEATING ELEMENT, INFRARED – REPLACEMENT
1. Shut off power at main breaker.
2. Remove conveyor and lower finger assemblies. Remove front conveyor support from
oven cavity.
3. Remove front cover and heating element cover. Disconnect wiring from heating element
and mark wires for reassembly.
4. Reassemble in reverse order and check system operation.
MAIN CONTROL – SETTINGS
Error Top 1
Fan
Main
Heater
1
3
Top 2
IR
Top 3
IR
Bottom
2
4
START UP
1. Push the “On Off” (O / |) switch to the “ON” position. The display will indicate
“SELECT PROGRAM”
2. Press the #1 PROGRAM BUTTON. The toasting program will indicate “SANDWICH”
The #1 program button will blink. (Buttons #2, #3 and #4 can be used for other menu
item programs.)
3. Programming the unit to desired settings:
To enter the program mode, press and hold the UP BUTTON for 5 seconds.
The UP and DOWN BUTTONS will light indicating the control is in a change
status.
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