From: wa2ise
Newsgroups: rec.radio.amateur.misc

Subject: TS140 intermittant loss of TX power fix

Keywords:fix

Message-ID: <1991Dec10.153807.21505
Date: 10 Dec 91 15:38:07 GMT

Sender: news
Organization: AT&T Bell Laboratories

Lines:32





copied from packet:

 Msg# TSF  Size #Rd  Date  Time From   MsgID        To

 8737 BF   1366   0 07-Dec 0510 KD2EJ  28378_WB2QJA INFO
 Sb:TS-140 INTERMITTENT LOSS TMXT.



SB-928



TS-140S Intermittent loss of TX power                 4-11-88





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.



1.   Disconnect the TS-140S from the antenna and power supply.

2.   Remove the top and bottom covers.  Open the sub-chassis.  Refer to the

instruction manual for step by step instructions.

3.   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.

4.   Resolder Q2 so that the transistor makes firm contact with the heat

sink on the Final unit.  Tighten the transistor's mounting screw.

5.   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.



© 121589TKC

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Note:I haven't tried or verified this, proceed at your own risk.  WA2ISE