TurboChef NGO/SOTA - Page 63

40 TR
OUBLESHOO
TING
NO
Troubleshooting:
No Displa
y – Screen is Blank
YES
NO
D
oes the keypad beep when
a key is pressed?
Is wiring from the
contr
ol board to the
display OK?
I
s pin 1 on the J7
connector receiving 5
VDC? (see schematic,
page 45)
NO
YES
YES
Replace the display.
NO
NO
YES
Is the power supply
output 24 VDC?
NO
YES
YES
Verify 5 VDC is
pr
esent on pin 1 of the
J7 connector
. If not,
r
eplace the control
boar
d.
Is the control board
receiving correct VDC?
V
erify v
oltage on pin 2
of the J7 connector is
24 VDC (see schematic,
page 45).
Replace the F1 and/or
the F2 fuse.
Check wiring from the
power supply to the
control board. Correct
wiring if necessar
y
.
Replace the control
board.
Correct wiring. If
ribbon cable is
damaged, replace the
keypad.
I
s the po
wer supply
receiving power?
R
eplace the power
supply
.