Microtel Series 250 - Manual (Page 24)

IV MAINTENANCE AND TROUBLESHOOTING
In the unlikely event that trouble is suspected with the system, it must be promptly
disconnected from the telephone network, and referred to Microtel Inc. or its authorized
service representatives.
Periodically inspect the system internally for any evidence of moisture, blown fuses, or
battery failure as instructed herein.
A. MAINTENANCE
1. Battery Care
Battery life is dependent upon a number of factors, and will vary depending on the
number of outages, and the age of the battery. A new battery will take no longer than
24 hours to gain a full charge, capable of powering the system through any power
outage up to four hours in length. It should be noted that the LOW BATTERY indicator
is only valid when the 120 VAC power is off. If the LOW BATTERY indicator stays on
for more than eight hours, the battery is in need of replacement.
2. Battery Replacement
The battery is installed at the bottom of the system in the battery tray, provided as part
of the interior chassis assembly.
NOTE: It is necessary to remove all power from the system before replacing the
battery.
Refer to Section 1-D - Battery Installation for instructions on installing a new battery.
3. Volume
Adjustment
The volume of the system’s speech messages delivered to the telephone network is
fixed. The volume of the speech heard through the system speaker is, however,
adjustable by varying the setting of potentiometer R21, located on the main circuit card
in the unit.
4.
Acknowledge Tone Adjustment
R33, located on the system’s main board, is the adjustment for the frequency detected
during the acknowledgment of an alarm call. By activating SEQUENCE 55 (see
previous section) the system will deliver a continuos acknowledge tone (* key) to itself,
during which the potentiometer R33 may be set. Center the adjustment by varying the
setting until the Acknowledge LED on the front panel turns on. There is some amount
of hysteresis associated with the detection so the centering of the component must take
into account approached from each direction. The continuous tone used for adjustment
may be halted by depressing the HALT key after the adjustment is completed.
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