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
SOURCE: The QRZ Windows Ham Radio CDROM |
