Gasboy 9800Q Series Diagnostic Manual - Manual (Page 50)

GASBOY Series 9800Q
4-10 01/28/04
Product is dispensed, but no quantity shows on the 9800Q display.
Possible Cause
Checks Corrective Action
Broken or damaged coupling. Broken or damaged coupling. Repair or replace coupling if
damaged.
Defective pulser or defective
CPU PCB. While dispensing fuel slowly,
measure between GND (TP2)
and pins 1 and 2 of connector
P3 (side 1) or P5 (side 2) on
the CPU PCB using an
oscilloscope. Replace the pulser if a +5VDC
square wave is not measured
between GND and pin 1 and
between GND and pin 2 of the
appropriate connector.
Replace the CPU PCB if a
+5VDC square wave is
measured but the displays still
show no quantity.
NOTE: Changing the pulser
rate switches may require
replacement of your Weights
and Measures seal.