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Mods for the Bearcat 2500xlt
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From: [email protected] (russell.w.keating)
Newsgroups: alt.radio.scanner
Subject: 2500xlt cellular mod
Message-ID: <[email protected]>
Date: 16 Aug 93 13:37:19 GMT
Distribution: usa
Organization: AT&T
Lines: 65
NOTE: since receiving this mod, I have been told that there are two
different pc board designs for the 2500xlt. Make sure you have the
unit that corresponds to this mod.
This is the cellular restoration mod for the Bearcat 2500xlt. The
paper this was taken from had no Copyright notice on it so here it is.
The diagrams included on the paper make things much easier to
understand.
1. Remove the antenna and battery pack from the BC2500XLT. Lay it on
its face on a soft cloth or towel, bottom of the radio facing you.
Remove the two upper (black) and two lower (chrome) screws.
2. Carefully pry the back loose from the radio and lift it off.
Similarly, grasp the visible circuit board by the edges and carefully
pull it away fron the radio just far enough to separate it from the
white (11 pin) Molex connector. Do not stretch the remaining ribbon
connector. Lay the board alongside the radio.
3. Locate microprocessor chip "Uniden UC-1513A", and the cluster of
chip resistors marked "104" below it (see diagram). Using a
magnifier and fine-point soldering iron, unsolder the
lower-left-most chip resistor and move it one place to the
left, soldering it in place.
Reassemble the radio by reversing steps 1 and 2, and test it by
entering 879.990Mhz. Search steps in this range will be the
correct 30 KHz.
| |
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| UC-1513A |
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|Number of pins on diagram may be wrong.|
|Make identification by resistor matrix.|
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-----------------------------------------
| | | | | | | | | | | | | | | | | | | |
| | | | | | |
| | | | | | |
| | | | | ---------|
| | | | | |
| | | | --------| |
p = solder pad | | | | | |
c = a component | | | --------| | -----
R = the resistor to move | | | ---- | | \
X = the new location | | | / \ | | \
for "104" p | p-c-p p | p-c-p |
/ | / / / | | |
| | / | / | / |
p X p-R-p p p-c-p p-c-p p
| | | | | | /--\
|----- |-------------------------- ---
^ ^
| |move this resistor "104" to the left
| |
|<-<-<-<-<-<-<-<-<-<-<-<-<-<-<-<-<-<--|
Russell Keating, N9LIL ------------> Send email to: [email protected]
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