GAI-Tronics 495-001 Mine Dial / Page Phone Interface Cabinet - Manual (Page 18)

Pub. 42004-198D
Model 495-001 Mine Dial/Page Phone Interface Cabinet Page: 18 of 22
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Battery Charging Check-out after AC Power Outage
Battery charging current as indicated on C HARGE C URRENT meter (M701) on panel of Power
Supply/Metering Panel assembly after restoration of ac power can be as high as ½ amp depending on
length of outage and prior battery condition. If there is no indication of charge current, check both fuses
on the front panel of DC Power Transfer assembly. See Figure 10.
If green T ELEPHONE S ERVICE lamp (CR602) on All Call/Merge Assembly is not lit:
1. Check operation of telephone switchboard using a conventional telephone, preferably one connected
to the switchboard via same cable used for the Mine Dial/Page Phone System.
2. Check switchboard monitor voltage on terminals 5 and 6 of terminal board TB401 using dc voltmeter
(positive on 6). If higher than normal, check R401 and test link on same terminal board (TB401).
Also, check indicator light itself (CR602) and relay (K653) located within the All-Call/Merge
assembly. Refer to Figure 7.
Figure 10. DC Power Transfer Assembly 10430-001