Wayne Vista Series Service page 161

The Pulser Interface PCB board allows our Duplex computer base to recognize Gilbarco nozzle
switches, pulsers, solenoids, and submersible pump relays. The connector/jack assignments on
the board are as follows:
J5 Supplies 170 VDC to Gilbarco I.S. Barrier to operate pulsers.
Supplies 5 VDC to one side of nozzle switches.
J3 Provides return path from opposite side of nozzle switches to Duplex computer base.
Carries converted pulser signals to Duplex computer base.
J4 Carries solenoid current to side one solenoids via J7.
Carries submersible pump current to product relays via J8.
J1 Carries solenoid current to side two solenoids via J7.
The Pulser Interface PCB is located on side one (junction box side) of the dispenser in the DEM.
Except for the PCB, the pulser and I.S. Barrier, all electronic troubleshooting procedures will be
the same as for a Wayne Vista dispenser.
Pulser Troubleshooting (Error Code XX-052): First measure the Pulser Power (see Figure D-
1) between Orange (+) and Gray (-) at point "B" should read approximately +12 VDC (This
measurement must be made with the pulser plugged in). If 12V is not present, check for
170VDC between the Orange (+) and Gray (-) wires at point "A". If 170V is not present, replace
Pulser Interface PCB. If 12V is present in the first step above, the next step is to determine if the
pulser is functioning properly. Turn the pulser slowly by hand and measure at point "B" from
Gray (-) to Yellow. This measurement should alternate from +12 VDC to 0 VDC as the pulser is
slowly turned. Repeat this measurement from Gray (-) to Brown and it should alternate from 0
VDC to +12 VDC. If you do not obtain these readings, replace the pulser.
Pulser substitution with another pulser circuit in the same MPD is an acceptable alternative to the
above test procedure.
I.S. Barrier Troubleshooting: The I.S. Barrier is tested by substitution or disconnecting and
measuring with an ohm meter. Measure from Gray to Gray, Yellow to Yellow, Orange to Orange
and Brown to Brown. You should read 10,000 OHMs + or - 20% in each case. You should read
high resistance to the Green wire or to the case from all other wires.
FIGURE D-1. PULSER INTERFACE PCB WIRING DIAGRAM
November 1992 Part No. 917543 Rev. A
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