GAI-Tronics 495-001 Mine Dial / Page Phone Interface Cabinet - Manual (Page 17)

Pub. 42004-198D
Model 495-001 Mine Dial/Page Phone Interface Cabinet Page: 17 of 22
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System Troubleshooting Procedure
Power Supply/Metering Panel Alarm Indicating Faults
Refer to Figure 8. If the green R ESET I NDICATOR lamp (CR504) on the DC Power Transfer assembly
panel is not lit:
1. Check for presence of ac line voltage. The amber AC O N lamp (DS701) on the Power
Supply/Metering Panel should be lit. If it is not lit, check power switch (S702) and ac supply line.
2. Press R ESET button on panel of DC Power Transfer assembly. See Figure 10. If ac power has been
temporarily interrupted, the R ESET I NDICATOR should turn on and the alarm system should turn off.
3. Turn V OLTAGE switch (S701) on the Power Supply/Metering Panel assembly to L OAD -A position. A
reading in the vicinity of 12 volts on the DC V OLTS meter (M702) indicates the system is operating,
possibly by obtaining all operating current from the battery.
4. Turn switch to D-PWR.SUPPLY position. If the DC V OLTS meter now indicates zero or near zero
voltage, even with the presence of ac line voltage, the internal power supply may be defective, or the
ac fuse may be blown. The ac line fuse is a 2 A slo-blo (F701) fuse located in the rear of the Power
Supply Metering assembly under a cover plate. Refer to Figure 9. The cover plate must be removed
to access the fuse.
5. If the system is not operating, check battery voltage indications on DC V OLTS meter by turning
V OLTAGE switch to B ATTERY -B position. Also, compare reading with switch in C-C HARGE position.
If it is not the same, check 10 A fuse (F502) on panel of Power Transfer assembly. See Figure 10.