Figure A-23. Displays Are On But Unit Will Not Respond - Wayne Dresser Vista 1 Series Service Manual

Displays are on but
the unit will not
reset.
Defective
Push-to-Start
switch or wiring.
Correct as
necessary.
Blown fuse on,
or defective,
cash/credit
interface board.
Correct as
necessary.
Defective handle
switch or wiring to
switch. Refer to the
proper wiring diagram
check for continuity at
plug on computer with
handle on.
Is there
continuity at
computer?
YES
Is there a
control system
installed?
NO
Check self-serve/
attend switch.
Replace if
defective.
Replace the
computer.
END

FIGURE A-23. DISPLAYS ARE ON BUT UNIT WILL NOT RESPOND.

96
Part No. 920160 Rev A
Is the
YES
problem
corrected?
NO
Is the
problem
YES
corrected?
NO
Check for
continuity at the
NO
switch.
Is the
dispenser
YES
authorized?
YES
Is the
dispenser
communicating?
YES
Is there
continuity at
NO
the switch?
YES
Authorize dispenser
NO from the control
system.
Check fueling point
at dispenser. Reset
NO
if necessary.
Is the
problem
NO
corrected?
YES
Replace the
handle switch.
Replace defective
wiring harness.
February 1997