Turbo Chef Technologies i5 service manual Does the keypad beep when

46 TROUBLESHOOTING

Troubleshooting:

No Display – Screen is Blank

	Does the keypad beep when
YES
	a key is pressed?

NO

Is wiring from the control board to the display OK?

YES

NO

Replace the fuses. (page A-5 through A-6)

Correct wiring. If ribbon cable is damaged, replace the keypad (page A-5 through A-6).

Replace the power supply (page A-5 through A-6).

NO

NO

Is the power supply receiving power?

YES

Is the power supply output 24 VDC?

YES

Is pin 1 on the J7 connector receiving 5 VDC? (see schematic, page 51)

YES

Replace the display (page A-8).

NO	Replace the control
	board. (page A-8)

Check wiring from the power supply to the control board. Correct wiring if necessary.

NO

Is the control board receiving correct VDC?

Verify voltage on pin 2 of the J7 connector is 24 VDC (see schematic, page 51).

YES

Verify 5 VDC is present on pin 1 of the J7 connector. If not, replace the control board (page A-8).