Wayne Dresser Vista 1 Series, Service Manual

Page: 103 / 150

93
February 1997 Part No. 920160 Rev A
FIGURE A-20. DISPLAYS SCRAMBLED OR MISSING SEGMENTS.
Display scrambled,
missing segments,
or display appears
normal but frozen.
Does
problem exist on
both sides of
dispenser ?
Replace the
computer assembly.
END
FC-00122-A
NO
Reseat connector to J2 on
cash/credit interface board
and connector to J4 or J5
on computer assembly.
J4 is for side 1 display.
Check this cable for continuity
and replace it if defective.
YES
Is the
problem
corrected ?
NO
Check F1 fuse on
cash/credit interface board.
If fuse is open replace the
board. If dispenser is not
Push-to-Start model, the
board shoud be replaced
since F1 does not exist.
NO
Replace the display
board.
Is the
problem
corrected ?
Is the
problem
corrected ?
Is the
problem
corrected ?
YES
NO
Replace cash/credit
interface board
if not replaced in
step above.
YES
Is the
problem
corrected ?
Replace cable
between J1 on
cash/credit interface
board and J1 on
display board.
Do displays
appear normal but
frozen ?
NO
NO
YES
Replace F3 on the
computer assembly.
After replacing,
verify that new F3
is still good.
Replace
computer
assembly.
Is the
problem
corrected ?
YES
NO
Is there
a jumper wire
across pins 8 & 9 of
J5 connector on the
Cash/credit
interface
board ?
Replace
this
wiring
harness.
YES
NO
YES NO
Is the
problem
corrected ?
YES
NO
YES
YES