Kenwood TH-25A Instruction Manual page 18

2. Remove the Volume, Squelch, and Tuning Control knobs by pulling them straight up from the top
panel.
3. Using a 7mm spanner wrench, remove the nut from the volume control and the nut from the tuning
control.
4. Remove one screw located by the PTT switch. (Figure 1).
5. Remove one screw located by the speaker jack. (Figure 2).
6. Remove two screws from the battery terminal plate. (Figure 3).
7. Carefully pull the front panel up from the transceiver (do not break the wires connected between the
front panel and the body of the transceiver.) Lay the front panel to the side of the transceiver (Keep
track of the F.LOCK cover if it comes off.)
8. Remove the PTT cover.
9. Remove one screw from the PTT switch unit. (Figure 4).
10. Gently lift the top panel from the transceiver by pulling it forward and then up (the O ring on the
BNC connector will produce some tension.)
11. Carefully unfold the flex Printed Circuit Board (PCB) to expose IC2. (Figure 5).
12. Using a 45 watt (or less) soldering iron that has an isolated or grounded tip, add a diode between
pins 23 and 58 of IC2. (Figure 6).
13. Carefully assemble the transceiver by reversing step 1-11. Pull the BNC connector "O" ring up a
little before installing the top panel.
14. Reset the microprocessor by following the procedure in the instruction manual (page 16) called
CLEARING ALL MEMORY.
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