Microtel Series 500 - Manual (Page 56)

49
VII. System Maintenance
VII.A.
Adjusting System Amplitude Levels
There are only three audio amplitude adjustments necessary on the Microtel MCS 500
dialing system.
1. If the system contains the speakerphone-intercom option, then the adjustment
labeled R54-Mic Gain will control the sensitivity of the microphone connected to
the MCS 500 system.
2. Located on the lower right hand corner of the system bus on the MCS 500, are
two controls, one for external volume, and one for speaker volume. Speaker
volume control, R9, controls the volume of the speaker mounted to the right hand
side of the MCS 500 chassis. This amplitude is set at the factory for optimum
levels. If it is necessary to adjust the speaker volume, do so with a non-metallic
screwdriver.
3. The external volume control controls the volume of an external speaker which
may be connected to the external audio jack located on the lower right hand
corner of the MCS 500 system I/O bus. The amplifier controlled by this
adjustment is capable of powering a 10 watt speaker which may be located
remotely from the MCS 500 system.
VII.B.
System Battery
Battery life is dependent upon a number of factors, predominately the number of power
outages, the length of the outages, and the age of the battery. A battery in a typical
monitoring application will last approximately two years. A new battery should take no
longer than 24 hours to gain full charge, capable of powering the system through any
power outage of up to 24 hours in length (based on the power requirement of an 8
channel system). If a battery is installed and the low battery indicator located on the
system power supply stays on for more than 8 hours, the battery is in need of
replacement. The battery fits in the battery well to the left of the I/O bus and just below
the system power supply within the MCS 500 chassis. Refer to the section entitled
“Battery Installation” for information on installing a new battery.
VII.C.
RV Memory Battery
The Real Voice memory is powered through long term power outages by an on-board 3
volt lithium cell. If this lithium cell ever registers less than 2.5 volts when measured with
a standard digital volt meter, it is in need of replacement. When replacing or installing a
new lithium cell, be certain polarity of the battery is correct. Failing to do so does
damage to the Real Voice memory card circuitry. Additionally be certain that JMP-1,
the battery enable jumper, is installed correctly so that it enables the battery to properly
power the real voice memory circuits on the card.