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1996-01-28
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15KB
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134 lines
bc205xlt
see files bc205xlt.1 - .5 on mods for
800 mhz restoration
test mode
cellular freqs
BC205XLT.1
UNIDEN/BEARCAT 200/205XLT TEST MODE
by Bob Parnass, AJ9S
According to the Uniden/Bearcat 200/205XLT Service Information Manual, the
following procedure will load channels 1-25 with various test frequencies, and
zero the remaining 175 channels:
1. Press and hold three keys: 2, 9, and MAN simul-taneously and turn
the power switch on.
2. Set the power switch to the off position.
3. Repress and again hold three keys: 2, 9, and SCAN simultaneously and
turn the power switch on.
BC200/205XLT CELLULAR RESTORATION
Note: It is unlawful to monitor cellular telephone conversations. It is
possible to monitor signals from the deleted ranges even without conversion.
Simply add 21.7 MHz to the deleted frequency and enter the higher (image)
frequency. Reception is virtually identical in strength to that which would be
heard on the deleted frequency.
The frequencies deleted at the factory may be restored, but the
procedure must not be attempted by anyone unfamiliar with electronic
circuitry. Grove Enterprises assumes no liability for damage caused by
this procedure. (I won't eighter! WA2ISE). The modification will void
your warranty.
CONTINUED IN FILE BC205XLT.4
BC205XLT.2
REASSEMBLY
7. Insert the top of the front panel into the slot under the
volume/squelch control panel and, noting carefully the alignment of
the dual inline connector at the bottom of the board with the
mating socket, press the front panel firmly into place. Be sure
that the holes at the bottom of the circuit board line up with the
holes in the plastic standoffs below them. Insert the two screws
and gently tighten them.
8. Replace the back cover by inserting the top of the cover into the
slot under the volume/squelch control panel; press the cover into
place, insert and tighten the screws.
9. Reposition the battery retaining spring (slotted side toward
notched hole), insert the two remaining screws and gently but
securely tighten them.
CONTINUED IN FILE BC205XLT.5
BC205XLT.3
BEARCAT BC200/205XLT SCANNER MODIFICATION
RESTORING THE DELETED 800MHZ BAND OF YOUR BC200/205XLT CAN BE
ACCOMPLISHED EASILY BY LOCATING THE MICROPROCESSOR LABELED,"UNIDEN UC-
1147". ONCE YOU'VE IDENTIFIED THAT IC,LOCATE THE 10K OHM RESISTOR
(BROWN-BLACK-ORANGE) POSITIONED ABOVE THE LETTERS "DEN" ON THE IC. THE
RESISTOR IS LEADLESS,SO TO ACCOMPLISH THE MOD,SIMPLY CUT THE BODY OF
THE RESISTOR IN HALF. USE MINIATURE WIRE CUTTERS.
DO NOT DISTURB ANYTHING NEAR IT. IF THE LEFT SOLDER PAD COMES LOOSE,IT
MAY BE PEELED FROM THE BOARD. BRUSH OR BLOW AWAY ANY RESIDUE.
NOTE*** IT IS UNLAWFUL TO MONITOR CELLULAR TELEPHONE CONVERSATIONS
73 DENNIS WB2WPO @ KE2KQ HUNTINGTON NY (ZIP 1174BC205XLT.4
TOOLS REQUIRED: Small Phillips screwdriver, small wire cutters.
1. Slide off the battery pack and remove the antenna from the scanner.
2. Using a small Phillips screwdriver, remove the two screws from the
back of the scanner, the two screws which hold the battery
retaining spring at the base and the spring itself.
3. Carefully pry the bottom of the rear cover from the radio and
remove the cover.
4. Locate the two small screws at the base of the circuit board and
remove them. Gently pull the front panel from the mainframe at the
base and separate them.
5. Locate the (64 pin quad flatpack) microprocessor IC labelled
"UNIDEN UC-1147" and the 10k ohm (brown-black-orange) leadless
resistor positioned above the letters "DEN" on the IC.
6. Using miniature wire cutters, cut the resistor body in two without
disturbing anything else near it. If the left solder pad comes
loose, it may be peeled from the board. Brush or blow away any
residue. This completes the restoration.
continued in file bc205xlt.2
BC205XLT.5
10. Slide the battery pack into place; switch the scanner on to make
sure the display comes on. If not, the battery is discharged or
the dual-inline connector was misaligned during assembly
(see step 7).
Assuming the display comes on, press: MANUAL, 845.0, E; within two
seconds, the frequency 845.000 should appear on the display.
Cut this resistor
V
[*10k*] [ ]
I I I I I I I I I I I I I I I I I I
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= U N I D E N =
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U C - 1 1 4 7 =
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I I I I I I I I I I I I I I I I I I
.......................................
Pete Simpson, KA1AXY
.......................................
CONTINUED IN FILE BC205XLT.3
BC205XLT.1 Test mode & Cellular restore Pt 1
BC205XLT.2 Cellular restore Pt 3
BC205XLT.3 Another 800 MHz restoration
BC205XLT.4 Cellular restore Pt 2
BC205XLT.5 Cellular restore Pt 4