TROUBLESHOOTING
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-8).
Correct wiring.
If ribbon cable is
damaged, replace the
keypad (page A-8).
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 (page 45).
Verify 5 VDC is present
on pin 1 of the J3
connector (page 45). If
not, replace the control
board (page A-8).
Is the control board receiv-
ing correct VDC
(page 45-46)?
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 45)
Is wiring from the
control board to
the display
(including the rib-
bon cable) OK
(page 45)?
YES
NO
NO
NO
NO
YES
YES
YES
NO
NO
YES
YES
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