Wayne Dresser Vista 1 Series, Service Manual

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February 1997 Part No. 920160 Rev A
6. TROUBLESHOOTING GUIDE
Many problems that appear to be the result of a defective computer are really caused by contami-
nation of the computer memory. Prior to replacing the computer for a first occurrence of a partic-
ular problem, a RAM clear should be initiated and the computer retested. If the computer functions,
it should not be replaced unless a second occurrence of the same problem results.
WARNING
!
Electric Shock Hazard!
The above and following actions in this Section require that the electrical power to the
equipment be ON. Use wiring diagrams, connector drawings and other information
in this manual to identify the electrical connections and AVOID contact with the
electrical power. Failure to do so may result in severe injury or death.
To clear the RAM on the Duplex II computer use the following procedure:
1. Record all totals and all option programming.
2. Remove power from the board by removing connector J3.
3. Locate connector J6 and bridge (jumper) pins 3 & 5. Use jumper part number 129930. Pin
1 of J6 is located closest to the center of the board.
4. Apply power to the board by re-installing connector J3. The unit price display will show
“OP01” to indicate the option programming mode has been entered and Option 01 has been
selected.
5. Press the Price Jog push-button to go to Option 97 where the sale money display will show
XAB; AB being the right hand two digits.
6. Use the Totals push-button to change the value in the volume display to XBA. For example,
if the money display shows 06 in the right hand two digits, enter 60 in the right hand two digits
in the volume display.
7. Press the Price Jog push-button; a RAM clear will occur in a few seconds and the computer
will immediately enter Option 01.
8. Use the Price Jog and Totals push-buttons to reset the options as necessary and Save the new
settings with Option 99 set to 03.
9. Remove the security jumper.
10. Press the Price Jog and then the Position Select push-button to return the dispenser to the
normal operating mode.
Note: Reset the fueling point number and unit prices as necessary after performing this
procedure.