Turbo Chef Technologies 3240 Troubleshooting No Display - Screen is Blank, Is wiring from the

Troubleshooting:

No Display - Screen is Blank

43

			Does the keypad beep when a
	YES
			key is pressed?
			Replace the fuses (page A-8).
Is wiring from the
control board to
				Correct wiring.
the display
				If ribbon cable is
(including the rib-
		NO		damaged, replace the
bon cable) OK
				keypad (page A-8).
(page 45)?

NO

	Is the 24 VDC power
NO
	supply receiving
	power?
		YES

					Replace the power				Is the power supply
						NO
					supply (page A-8).				output 24 VDC?
		YES
										YES
Is 5 VDC present on pin 1 of								Is the control board receiv-
					Replace the I/O con-
the J3 connector? (page 45)								ing correct VDC
			NO
					trol board (page A-8).
								(page 45-46)?
		YES								YES
				Check wiring from the				Verify 5 VDC is present
	Replace the display and			power supply to the control				on pin 1 of the J3
	ribbon cable.
				board. Correct wiring if			NO	connector (page 45). If
	(page A-8)
				necessary (page 45).				not, replace the control
								board (page A-8).
					Troubleshooting:
					No Keypad Input

	Is the keypad cable properly connected
YES
	to the control board?

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).

NO

Correct wiring.

T RO U B L E S H O OT I N G