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hamradioversion3.0examsandprograms1992.iso
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mx4200.1
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1990-09-04
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34 lines
MX4200.1
The low battery sensor threshhold is controlled by a
potentiometer. Here's how to readjust the sensor to 4.0
volts:
1. Turn the scanner off.
2. Connect a digital voltmeter to a well regulated DC
power supply and adjust the supply to 5.0 volts.
3. Connect the power supply to the snap terminals on
the scanner that would normally connect to the bat-
tery pack. Be sure to observe proper polarity.
Connect the positive lead of the supply to the
female snap, and the negative lead to the male snap.
4. Turn the scanner on.
5. As you watch the scanner's LCD display, gradually
reduce the power supply voltage until the scanner's
low voltage warning begins to flash.
6. Read the digital voltmeter. If it reads between 3.9
and 4.0 volts, no further adjustment is required,
just disconnect the supply and reconnect the battery
pack.
7. Otherwise, turn off and disconnect the power supply,
and continue.
8. Turn the scanner upside down, and place its
cloth so as not to scratch the case.
9. Remove the bottom tilt foot from the scanner.
10. Remove the battery pack.
11. Remove the 4 Phillips screws holding the case bot-
tom, then remove the case bottom.
12. Reconnect the power supply to the scanner and set it
to 4.0 volts.
CONTINUED IN FILE MX4200.2