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- Subject: 2500xlt cellular mod
-
- 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.
-
-
- | |
- | |
- | UC-1513A |
- | |
- | |
- |Number of pins on diagram may be wrong.|
- |Make identification by resistor matrix.|
- | |
- -----------------------------------------
- | | | | | | | | | | | | | | | | | | | |
- | | | | | | |
- | | | | | | |
- | | | | | ---------|
- | | | | | |
- | | | | --------| |
- 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: russell1@ihlpb.ATT.COM
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