55
TROUBLESHOOTING
Troubleshooting:
No Display – Screen is Blank
Are any of the LEDs on
the back of the display lit?
NO
NO
NO
NO
Is the power supply
output 24 VDC?
NO
Is the control board
receiving correct VDC?
Verify voltage on pin 2
of the J7 connector is
24 VDC (See page 64
for schematic).
Replace the F1
and/or the F2
fuse.
Return the oven to service.
Return the oven to service.
There are three buttons of the back of
the display in a column.
While holding down the bottom two
buttons, press the top button. Let go of
the top button first, and then let go of
the bottom two buttons.
Check wiring from
the power supply to
the control board.
Correct wiring if
necessary.
Give the display 20 seconds to
recover. Did it recover?
Is the power supply
receiving power? (Is
the green light on?)
Replace the power
supply.
NO
NO
NO
Is 5 VDC present on pin
1 of the J7 connector? If
not, replace the I/O con-
trol board (SAGE).
Replace the I/O control
board (SAGE).
Replace the display.
Is the blue LED flickering?
Replace the
display.
Replace the
display.
NO
Replace the power
supply.
Is the display white or does it
have stripes across it?
Unplug the oven for 20
seconds and plug it back
in. Did the display come
back?
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