TurboChef Technologies 2020 User 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

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