vii
November 1992 Part No. 917543 Rev. A
TABLE OF CONTENTS, continued
Title Page
APPENDICES
APPENDIX A TROUBLESHOOTING FLOWCHARTS, continued
Flowchart A-10. 12 Fault Code ....................................................................................... 82
Flowchart A-11. 13 Fault Code ....................................................................................... 83
Flowchart A-12. 14, 15 or 16 Fault Code........................................................................ 84
Flowchart A-13. 51 Fault Code ....................................................................................... 85
Flowchart A-14. Displays Are Blank .............................................................................. 86
Flowchart A-15. Displays Scrambled.............................................................................. 87
Flowchart A-16. Unit Will Not Respond To Individual Function Switch ....................... 88
Flowchart A-17. Unit Will Not Respond To Any Function Switches ............................. 89
Flowchart A-18. Unit Will Not Reset.............................................................................. 90
Flowchart A-19. Unit Resets But Will Not Dispense...................................................... 91
Flowchart A-20. Unit Prices Show 0.000........................................................................ 92
APPENDIX B ELECTRONIC/ELECTRICAL COMPONENT TROUBLESHOOTING.......... 93
B.1. Introduction ............................................................................................................. 95
B.2. Removing the Bezel from the Dispenser ................................................................. 95
B.3. The Dispenser Electronic Module (DEM)............................................................... 97
B.4. Testing the Duplex II Computer .............................................................................. 99
B.4.1. The AC Input to the Solenoid Drive Board ............................................ 105
B.4.2. Output to the Pulsers and Handle Switches............................................ 106
B.4.3. Power Output to the Displays ................................................................. 107
B.4.4. Testing the Output to the Annunciators .................................................. 108
B.4.5. Testing the Power Output to the Preset Control Board .......................... 109
B.4.6. Testing the Input Power to the Computer ............................................... 110
B.4.7. Testing the Fuses on the Duplex II Computer ........................................ 111
B.5. Testing the Solenoid Drive Board ......................................................................... 112
B.5.1. Testing the AC Output from the Solenoid Drive Board ......................... 118
B.5.2. Testing the Pulser Select Circuits ........................................................... 119
B.6. Testing the Output from the Photocoupler ............................................................ 120
B.7. Intrinsic Safe Barrier Board................................................................................... 122
B.7.1. Testing the Intrinsic Safe Barrier............................................................ 125
B.8. Lighted Cash Credit Interface Board..................................................................... 126
B.9. Testing the Blend Motor ........................................................................................ 131
Figure B-1. Typical Vista Dispenser ............................................................................ 95
Figure B-2. Removing the Bezel from Vista Dispensers ............................................. 96
Figure B-3. DEM Removal .......................................................................................... 97
Figure B-4. The DEM in the Service Position ............................................................. 98
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