Antunes, AJ MEC-120, Manual, Page: 11 / 16

MANUAL EGG COOKER/STEAMER
10
P/N 1010841 Rev. F 12/04
McDonald’s
MANUAL EGG COOKER/STEAMER
11 P/N 1010841 Rev. F 12/04
McDonald’s
TROUBLESHOOTING (continued)
Control Board LEDs
The Control Board has three on board LEDs (Figure
6) to determine the status of the unit and to assist in
troubleshooting.
Green (Diagnostic) : This LED should be off in normal
operation, however if any of the 5 potential faults are
detected by the Control Board, this LED will repeat-
edly blink 1 through 5 times with a 2 second pause in
between. See Green LED Blink Codes below.
Yellow (Audio) : When lit, this LED indicates that the
Control Board is supplying approximately 10-15 VDC to
the audio signal. The audio signal should sound when
this LED is lit.
Red (Heat) : When lit, this LED indicates that the
Control Board is calling for heat by supplying VDC to
terminals 3(+) and 4(-) of the Solid State Relay. When
off, it means that the grill platen is up to operating tem-
perature and satisfied.
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Green LED Blink Codes
Number of Blinks Cause(s) Unit’s State
The Green LED blinks
on and off 1 time, paus-
es for 2 seconds, and
repeats.
The EEPROM memory on the Control
Board is corrupted.
In this state, the unit turns off the control signal to the
Solid State Relay and disables all front buttons and
lights. The unit will not heat up. This continues until
the defaults are reloaded into memory. To reload the
defaults, turn the unit off, press and hold the Time 2 but-
ton, turn the unit back on, and release the button.
The Green LED blinks
on and off 2 times,
pauses for 2 seconds,
and repeats.
The ambient temperature within the control
compartment has exceeded 155º F (68 C).
Verify that there is proper air ventilation
around the unit and that it is not near a
significant heat source.
In this state, the unit turns off the control signal to the
Solid State Relay and disables all front buttons and
lights. The unit will not heat up. This continues until the
ambient temperature drops below 140º F (60º C) and
the unit is turned off and back on.
The Green LED blinks
on and off 3 times,
pauses for 2 seconds,
and repeats.
Open or disconnected Thermocouple. In this state, the unit turns off the control signal to the
Solid State Relay and disables all front buttons and
lights. The unit will not heat up. This continues until the
Thermocouple is reconnected or replaced and the unit is
turned off and back on.
The Green LED blinks
on and off 4 times,
pauses for 2 seconds,
and repeats.
The supply voltage to the unit is below 160
VAC or above 265 VAC.
In this state, the unit turns off the control signal to the
Solid State Relay and disables all front buttons and
lights. The unit will not heat up. This continues until the
supply voltage is within the limit and the unit is turned off
and back on.
The Green LED blinks
on and off 5 times,
pauses for 2 seconds,
and repeats.
The 50/60 Hz signal has been lost due
to a loose, disconnected, or an open
wire harnness/wiring on the AC Isolator
Board, or from the AC Isolator Board to the
Control Board.
In this state, the unit turns off the control signal to the
Solid State Relay and disables all front buttons and
lights. The unit will not heat up. This continues until the
50/60 Hz signal is reapplied and the unit is turned off
and back on.
NOTE: During heat mode, this Red LED is very dim,
so it may be difficult to verify if the Control Board
is, or is not, calling for heat. It is recommended
that you observe the small round green LED on the
Solid State Relay (Figure 7) for mode and diagnos-
tic purposes. When the green LED on the Solid
State Relay is on, it means that the Control Board is
calling for heat. When off, it means that the Control
Board is NOT calling for heat.
Figure 6. Control Board
LEDs
Figure 7. Solid State
Relay
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Solid State
Relay
LED