General Preparations For Troubleshooting. (continued)
With power on, adjust detector operating voltage in accordance with instructions in paragraph
TROUBLESHOOTING CHARTS. Troubleshooting charts (Figure 4-1) outline steps to detect and
remedy faulty conditions that cause meter to read off zero under fresh air conditions, warn and alarm
circuit failure, more-or-less-than-full-scale meter pointer deflection in response to 100% L. E. L.
signals, fail circuitry malfunction, and faulty module response to gas conditions at the detector.
Troubleshooting procedures follow the order in which one circuit is dependent upon the others;
therefore deviations from the steps outlined in the charts are likely to result in inefficient and