In some TS-140S transceivers, the drive transistor, Q2, is not firmly mounted to the heatsink. This can cause a loss of transmit power after the unit warms up. The following modification will correct this condition.
- Disconnect the TS-140S from the antenna and power supply.
- Remove the top and bottom covers. Open the sub-chassis. Refer to the instruction manual for step by step instructions.
- Remove the shield plate from the sub-chassis (12 screws) to expose the filter an final units. Do not loose the 2 springs that are secured by the right side screws.
- Resolder Q2 so that the transistor makes firm contact with the heat sink on the Final unit. Tighten the transistor's mounting screw. (See the diagram below).
- Assemble the transceiver by reversing steps 1 through 3.
This modification may be performed under warranty.
Time required for this change is 1/2 hour or less.
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