TurboChef Sota

TROUBLESHOOTING
71
Troubleshooting:
No Display – Screen is Blank
Are any of the LEDs on
the back of the display lit?
NO
NO
YES
YES
NO
NO
Is the power supply
output 24 VDC?
NO
YES
YES
Is the control board
receiving correct VDC?
Verify voltage on pin 2
of the J7 connector is
24 VDC (See page 79
for schematic).
Replace the F1
and/or the F2
fuse.
Return the oven to service.
Check wiring from
the power supply to
the control board.
Correct wiring if
necessary.
Is the power supply
receiving power? (Is
the green light on?)
Replace the power
supply.
NO
Is 5 VDC present on pin
1 of the J7 connector? If
not, replace the I/O con-
trol board (SAGE).
YES
Replace the I/O control
board (SAGE).
Replace the display.
Replace the
display.
NO
YES
Replace the power
supply.
Is the display white or does it
have stripes across it?
YES
Unplug the oven for 20
seconds and plug it back
in. Did the display come
back?
NOYES
Does the oven beep repeatedly
while the display is blank?
Replace the I/O control
board (SAGE).
NO
Replace the 4-pin communications
cable between the display UI control
board (Phoenix) and the I/O control
board (SAGE). Did this fix the prob-
lem?