Do it
yourself
Here is a schematic and some
hints should you wish to try this modification on your own.
Use at your own risk!
If you do not have a telephone, you can omit the circuitry at the bottom of the schematic.
Modification hints
- Remove the two screws at the rear of the top cover. Remove the top cover.
- Remove the four screws that secure the tape transport mechanism. Remove the mechanism.
Remove
the four screws that secure the main circuit board to the bottom cover.- Remove the retaining clips from either side of the radio.
- Remove the four side screws and the ones at the rear that secure the bottom cover.
- Pull the face forward, disconnecting it from the main circuit board. Do not disconnect the flex cable.
- Carefully remove the bottom cover.
- On the bottom of the main circuit board, attach red, white, and yellow wires as shown. Route these wires to the top of the main circuit board through a hole on the board.
- Locate and remove capacitors E006and E007 as shown.
Attach
blue, green, white/blue, and white/green wires using the holes for the
capacitors as shown.- Locate a ground location, such as a point where the RF shielding is soldered to a circuit board. Solder a black wire to ground.
- Route these wires across the front of the main circuit board to the other side of the board.
- Reassemble everything but the top cover, routing all wires to the left side of the radio (facing the front) near the tape transport motors.
Trim
a circuit board such as a Radio Shack Multipurpose PC Board (model no.
276-150) to fit in the space at the left of the radio. Drill a hole in the board to mount it to
the tape transport mechanism, but don’t mount it yet.- Assemble the circuit on the board. Connect the wires as indicated.
- Cut the female end off of a 1/8” stereo extension cable. Run the cut end of the cable through an existing hole in the rear of the radio. Connect the cable to the circuit board as shown.
- Secure the circuit board using one
of
the tape transport mechanism screws. - Replace the top cover.