TurboChef Technologies 2020 - Manual (Page 56)

3 6 T R O U B L E S H O OT I N G
Is the keypad cable properly connected
to the control board?
Troubleshooting:
No Keypad Input
Replace the keypad (page A-8).
If the problem persists, or if beeps occur when
buttons are pressed but commands do not regis-
ter on the display, replace the control board
(page A-8).
Correct wiring.
YES NO
Troubleshooting:
No Display - Screen is Blank
Does the keypad beep when a
key is pressed?
Replace the fuses (page A-7).
Correct wiring.
If cable is damaged,
replace it.
Replace the power
supply (page A-8).
Replace the I/O con-
trol board (page A-8).
Check wiring from the
power supply to the control
board. Correct wiring if
necessary (pages 37-40). Verify 5 VDC is present
on pin 1 of the J3
connector (page 39). If
not, replace the control
board (page A-8).
Is the control board
receiving correct VDC
(pages 37-40)?
Is the power supply
output 24 VDC?
Is the 24 VDC power
supply receiving
power?
Replace the display and
ribbon cable.
(page A-8)
Is 5 VDC present on pin 1 of
the J3 connector? (page 39)
Is wiring from the
control board to
the display
(including the
ribbon cable) OK?
YES NO
NO
NO
YES
YES
YES
NO
NO
YES
YES NO