information on this
proceeding pages is intended for
educational purpose's only. So if
you must use this information do
YOUR OWN RISK!!
Pro-2004 Cellular Mod
The PRO-2004 scanner can be used to receive
telephone conversations. Originally, the scanner
able to receive in this band, but at the last
it was decided to delete cellular coverage from
The procedure to re-instate the cellular band is
simple for anyone with a pair of cutters, and a
- Remove the four screws from the back of the
radio, and slide off the cover from the chassis.
- Turn the radio upside down. You will find a
metal box-like sub- chassis in the center of the
chassis. Remove the cover and you will be
the CPU, a 64-pin integrated circuit.
- Examine the component side of this board,
you will find a row of diodes and resistors. On
end of the row you will find a diode labeled
- Clip the accessible end of D-513, and pry
the ends so they don't touch. You have just
cellular coverage to you scanner.
- If D-513 is not there, it may be located on
underside of the circuit board.
**Information was extracted from POPULAR
COMMUNICATIONS Aug 1987.
400 CHANNEL and SPEED MOD
- On the top of the sub-circuit board, locate
slot for D-513. Count backwards from there until
get to the space for D-510. Install a diode at
in the same polarity as the rest of the diodes.
There, you now have 400 channels instead of 300.
Now install a diode at D-514 and you have
the scan speed to 20 channels/sec from 16
PRO-2006 celluar mod
- remove the top cover by unscrewing the 2
in back. (be careful of the speaker cable
which is attached to the top part you would be
- locate diodes D502 & D503 behind the keypad.
- clip the lower diode (D502) to allow access
the cellular freqs.
- clip the upper diode (D503) to increase the
speed to 30 chnl/sec.
- set up search banks to operate in the 869-894
- use the (previously unavailable) 30 Khz step
while searching in that range.
After removing the two upper back screws and the
lid, locate the black cable just behind the front
panel. Adjacent to the cable is (diode 44) clip
end or remove entirely and the complete celluar
- To restore missing 800 MHz frequencies,
- To add 66 to 88 MHz (European Coverage),
install a diode at
- D-10 must remain in place for full 800 MHz
- If a diode is added at D-13 it cuts out aero
band, also seems to affect 800 MHz channel
- D-12 added dosen't seem to have any affect.
- Only D-10 and D-11 are factory installed.
PRO 37 CELLULAR
- Find and remove (D-13).
PRO 39 CELLULAR
- Find and remove (D-6).
TOOLS REQUIRED: Small Phillips
- Slide off the battery pack and
remove the antenna from the scanner.
- Using a small
Phillips screwdriver, remove the two screws from
back of the scanner, the two screws which hold
battery retaining spring at the base and the
- Carefully pry the bottom of the rear cover
from the radio and remove the cover.
- Locate the
two small screws at the base of the circuit board
remove them. Gently pull the front panel from the
mainframe at the base and separate them.
- Locate the (64 pin quad flatpack)
"UNIDEN UC-1147" and the 10k ohm
leadless resistor positioned above the letters
on the IC.
- Using miniature wire cutters,(cut the
resistor body in two without disturbing anything
near it). If the left solder pad comes loose, it
be peeled from the board. Brush or blow away any
residue. This completes the restoration.
- REASSEMBLE THE SCANNER, switch the scanner on
the display comes on. If not, the battery is
discharged or the dual-inline connector was
misaligned during assembly . Assuming the display
comes on, press: MANUAL, 845.0, E; within two
seconds, the frequency 845.000 should appear on
- remove all cabinet screws.
- remove 4 face plate screws and 1 bracket
center of main board.
- carefully depress the outside edges of
shield and tilt down.
- unplug j4 and j5 and ribbon connectors j501
- remove faceplate and logic board.
- position board so microprossesor chip is on
and memory battery on right.
- locate the 3 chip resistors at chips upper
right..marked 104 and carefully desolder.
- install the chip resistor at the 2 empty pads
closest to memory battery.
- reassemble carefully in reverse order.
- test by entering freq. around 870 mhz.