Sale Display And Unit Price Displays Are Blank; Sale Display On. Unit Will Not Respond To Individual Function Switch; Sale Display On. Unit Will Not Respond To Any Function Switches - Wayne Vista Series Service

Failure Indication
Sale display and unit
price displays are blank.
Sale Display ON. Unit
will not respond to
individual function switch
(i.e. the totals switch or
the price jog switch).
Sale display ON. Unit
will not respond to any
function switches.
48
Part No. 917543 Rev. A
Probable Cause
1. No power to
computer.
2. Defective display.
3. Defective computer.
1. Defective Switch.
2. Defective wiring
to switch.
1. Defective switches.
2. Blown fuse on the
lighted Cash/Credit
Interface board.
3. Defective wiring to
switches.
4. Defective switch
interface circuitry on
Cash/Credit interface
board.
5. Defective computer
assembly.
Corrective Action
Check control power circuit
breaker.
Check for AC between pins 1 and
2 of J3 connector. If not present
check in J-box. If not present in
J-box problem is in site wiring;
if 110 VAC is present in the J-box
the problem is in the dispenser
internal wiring. Check F1 and F3
on computer and replace as
necessary.
Replace the display board.
Replace.
Check for +5VDC off; zero
volts on, replace switch if voltage
is constant at either 5 or 0.
Check all wiring to defective
function switch.
Check for +5VDC off; zero volts
on. Replace switch if voltage
is constant at either 5 or 0.
Check F1 on the interface board
replace the board if the fuse is
blown.
Check all wiring to the function
switches.
Replace the Cash/Credit Interface
board.
Replace.
November 1992