Sigma AM-255 service manual Troubleshooting

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6. TROUBLESHOOTING page 18

To check the charger, disconnect the positive terminal from the battery and J1 from the AM-255 circuit board. Measure the voltage from between the black and red battery wires. It should be at least 13.5 volts. If it is not then the charger must be replaced.

NOTE:

Do not go on to the next step until the charger is working correctly. Battery voltage must be at least 12.5 Vdc for the unit to turn on.

6.3. TROUBLESHOOTING

If the unit is totally inoperative, verify that the unit is receiving power throughout the system. Refer to "Controller Board" Drawing 3 (Appendix F.) for the following procedure.

6.3.1. AM-255 Controller Board:

If the unit has power but still does not operate, test the power to the controller board. Connect the negative lead of the DVM to TP1 and the positive lead to TP2. The power should be

5 ±0.1 Vdc.

Model AM-255

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Contents
Alarm Monitor Model AM-255 Maintenance Table of ContentsTroubleshooting Theory of OperationAppendix Warranty Glossary Formulas Configuration Tracking Sheet PartsRecommended Spare Parts Spare Parts Ordering Information Scope and Purpose of Manual IntroductionSpecifications Inspection Inspection and SetupSET-UP Procedures Wiring Instructions Relay Outputs System #1 Input SignalsSystem #2 Input Signals Initial Setup Checklist Operating Instructions Controls and IndicatorsSummary of Alarm Indications Summary of Alarm IndicationsOperation Unit Operation Components Maintenance Procedures Performance Verification Checklist Component Access Do not go to until the battery voltage is 12.4 or greater Troubleshooting Longs Peak Court LONGMONT, Colorado Appendix B. Glossary page20 Appendix B. Glossary page21 Activity from Counts Appendix C. Formulas page23 Appendix C. Formulas page24 System Modifications Configuration Tracking SheetLongs Peak Court LONGMONT,COLORADO Longs Peak Court Drawings
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