Radio Shack Pro 39



TOOLS NEEDED: Fine-tipped soldering iron, desoldering wick,
small Philips screwdriver, long-nosed pliers, rosin-core solder.

(1) [Turn off your radio. Removing the batteries when the radio is ON can
erase the memory! ] Remove the battery door, holder and [battery
pack] from the bottom of the radio.

(2) Remove the four screws from the back of the scanner and carefully lift
the back off.

(3) Unplug the two wiring harnesses at their connectors and remove the six
bright colored screws that hold the circuit board in place. Unsolder
the ground wire from the lower right corner of the circuit board.
Unsolder the two wire connections from the BNC antenna connector at the
board. Carefully lift the board (grasping it near the Molex connector)
and set it aside.

(4) Remove the two bright colored screws from the next circuit board.
Carefully unplug the two-wire connector [and remove the board, as I
recall]. Unsolder and lift the rectangular metal shield exposing
the diodes.

(5) Carefully unsolder and remove diode D6 only; this will restore the
missing cellular frequencies which can be searched in appropriate
30 kHz steps.

This completes the cellular restoration. Reverse all procedures
to reassemble the radio and test it by entering any frequency between
869-894 MHz. [If you are as lucky as I was, the memory will still
contain your other frequencies! ]

Curious about the other diodes? D4 would enable 68-88 MHz
coverage, but deletes 30-54 MHz; D5 (present) allows 800 MHz band
operation; and D7 would make cellular spacing 12.5 kHz (incorrect).


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