Electronic Parts; Display Boards; Lighted Cash/Credit Interface Board - Wayne Dresser Vista 1 Series Service Manual

There are five types of electronic components in the head of a Wayne dispenser.
• Display Board

• Lighted Cash/Credit Interface Board

• Solenoid Drive Board
• Computer Assembly
• Intrinsic Safe Barrier Assembly
The hydraulics cabinet contains one or more of the following electronic or electrical components.
• Pulser assembly
• 2-Stage Solenoid Valve (Non Blenders Only)
• Proportional Flow Control Valve (Blenders only)
3.1.

DISPLAY BOARDS

The display boards are self-contained units which provide a visual display of sales infor-
mation (i.e., dollar amount, volume amount, unit prices). The actual display elements are
seven segment Liquid Crystal Displays (LCD's). These elements are back lit with two 7W,
field replaceable, fluorescent lamps to improve their visibility in low lighting conditions.
The LCD's are soldered to their printed circuit boards; therefore, they are not replaceable
in the field.
The display board receives its data from the computer assembly. The decoding circuits, and
the drivers for the LCD's, are located on the display board.
3.2. LIGHTED CASH/CREDIT INTERFACE BOARD
The lighted cash/credit interface board performs three functions. First, is the switch inter-
face; that is all of the function and operational switch closures are sensed by this board and
then transmitted to the computer. Second, it supplies power to the lighted buttons on the
dispenser that require them (push to start, cash/credit and grade select). The transformer on
the board converts 110 VAC input to approximately 18 VRMS in order to power the switch
lamps. Third, the cash/credit Interface Board provides the drive circuits to increment the
Electro-mechanical Totalizer.
February 1997

3. ELECTRONIC PARTS

Part No. 920160 Rev A
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