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47
February 1997
Part No. 920160 Rev A
A. To check the photocoupler, place voltmeter common lead on the pulser select pin of the nozzle position
being serviced. Place the voltmeter positive lead on pin 3 of J9 (J-box side of dispenser) or J10 (opposite
J-box side) on the computer base. Manually rotate pulser drive gear on top of meter assembly of position
being serviced. Voltmeter should fluctuate between 1 and 4 volts. Repeat for pin 6. If blender, also repeat
for pin 5 and pin 9. If any of the readings do not fluctuate, replace the photocoupler. Refer to the appro-
priate drawing in APPENDIX B.
B. Dust blocking one phase of the photocoupler can cause the same symptoms as a defective photocoupler.
If dust is found in the housing do not replace the photocoupler unless the error reoccurs.
TABLE 6-15. FAULT CODE 05 OR 20.
Probable Cause
Corrective Action
Could be a Wayne Vac error . If dispenser
is equipped with Wayne Vac see correc-
tive action, otherwise, proceed with
probable cause Pulse Jitter.
Check LED on Wayne Vac Control board. LED should flash
at power up and go OFF. If blinking see Wayne Vac service
manual part number 920023 for corrective action. If OFF
proceed with probable cause Pulse Jitter.
Pulser jitter.
1.
Cracked or broken disc.
Replace pulser disc.
2.
Defective photocoupler.
Test photocoupler.
A
3.
Dirt blocking opening on pulser disc
Clean pulser disc.
4.
Dust in housing.
B
Clean dust from housing and photocoupler. Adjust disc to
keep it from rubbing on photocoupler. Check for cracks in
housing, replace as necessary.
5.
Disc tension is not correct.
Check for missing wave washer. Install one if missing.
6.
Air in system causing severe hydraulic
shock.
Repair or replace faulty piping and purge all air from system.
7.
Loose plug or wire connection to ISB
assembly.
Verify connection to ISB assembly.
8.
Defective ISB assembly.
Replace complete ISB assembly (board not separately
replaceable).
9.
Defective solenoid drive board.
Replace solenoid drive board.
10.
Defective computer.
Replace computer.
Summary of Contents for Dresser Vista 1 Series
Page 1: ...1 Vista Series Blending and Non Blending Remote Dispensers SERVICE ...
Page 4: ...Part No 920160 Rev A February 1997 ...
Page 10: ...viii Part No 920160 Rev A February 1997 ...
Page 12: ...2 Part No 920160 Rev A February 1997 ...
Page 22: ...12 Part No 920160 Rev A February 1997 ...
Page 38: ...28 Part No 920160 Rev A February 1997 ...
Page 62: ...52 Part No 920160 Rev A February 1997 ...
Page 76: ...66 Part No 920160 Rev A February 1997 FIGURE 7 8 NOZZLE BOOT ASSEMBLY LIFT TO START ...
Page 77: ...67 February 1997 Part No 920160 Rev A FIGURE 7 9 NOZZLE BOOT ASSEMBLY PUSH TO START ...
Page 83: ...73 February 1997 Part No 920160 Rev A APPENDIX A TROUBLESHOOTING FLOWCHARTS ...
Page 110: ...100 Part No 920160 Rev A February 1997 ...
Page 111: ...101 February 1997 Part No 920160 Rev A APPENDIX B SERVICE INFORMATION AND CONNECTOR PIN OUTS ...
Page 134: ...124 Part No 920160 Rev A February 1997 ...
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