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Realistic Pro- 34 Mods
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pro34.10
Restoration of Cellular Frequency Coverage on
Radio Shack PRO-34 Handheld Scanner
1. Remove battery cover and battery, four black screws on rear cover, and volume and squelch knobs.2. Remove rear cover, lifting back and up to clear controls. Do not remove belt clip or circuit bo screws.
3. Unplug the brown volume control connector (grn/yel/blk) and white squelch control connector (whtk/red) from the linear circuit board.
4. Unsolder the ground lead from T111 (at corner of linear circuit board above the external power cectors). Unsolder the two power switch leads from the back of the volume control. Unsolder the atna connector center pin and ground wires from the linear circuit board.
5. Unscrew the four combination screws that hold the linear circuit board and received the back covscrews.
Grasp the linear board at the top and lift it straight away from the front case, unplugging the 16-pconnector.
6. Remove the three screws holding the metal frame assembly which held the linear board to the fronanel. Unplug the red-black power lead and lay the frame aside. It is still connected to the battr ontacts.
7. Locate diodes D9 - D12 on the volume control side of the of the logic circuit board under T1; D1nd D11 are marked. Clip one lead of D11, separating the gap. This may be resoldered later if desrd
8. Reassemble the board by reversing the disassembly procedures above.
Thanks to Robert Kelty, Larry Wiland, and Monitoring Times Magazine (Dec 1988 issue)
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