From: wa2ise@cbnewsb.cb.att.com (robert.f.casey) Newsgroups: rec.radio.amateur.misc Subject: TS140 intermittant loss of TX power fix Keywords: fix Message-ID: <1991Dec10.153807.21505@cbfsb.att.com> Date: 10 Dec 91 15:38:07 GMT Sender: news@cbfsb.att.com 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@ALLBBS () 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. (c) 121589TKC ========================================================== Note: I haven't tried or verified this, proceed at your own risk. WA2ISE