[Drake] Need advise on TR7 problem

[Steve Cochrane]

I have had this problem on two different TR7s. What worked for me in both
cases is a thorough cleaning of all the switches (including all the wafer
switches on the band switch) and I pulling and cleaned the digital readout
board. I used a spray electrical contact cleaner (environmentally friendly
of course) and then let the TR7 dry for at least 24 hours. I find that if I
do that about once a year it usually precludes these types of problems from
recurring. Additionally, I stopped smoking in the radio room. Good luck!
Steve / wa7h

----- Original Message -----
From: "Yongsurk Lee" <yonglee@yonsei.ac.kr>
To: <drake@mailman.qth.net>
Sent: Wednesday, March 13, 2002 5:35 PM
Subject: [Drake] Need advise on TR7 problem


>
>
>
>
>  Hello;
>       I own a Drake TR7 and it shows the following problems.
>  - When powered on, digital frequency display scans around at 17.3MHz on
14MHz band and below,
>              and scans around at 32.8MHz on 21 MHz band and above.
>  Someone suggested cleaning contacts on module pins and sockets but in
this case it did not cure the problems.
>  Any suggestion on which module may be causing the problem? I have a TR7
service manual and I am quite technical and has many test equipments. I
posted this before but I did not get sufficient responses. Thanks in
advance.
>
>  Yong Surk Lee, Ph.D
>  Professor of Electrical and Electronic Engineering Department
>     Yonsei University, Seoul. Korea
>  Ham; WW6N & HL1FB, Director of the Korean Amateur Radio
>     League  in charge of international affairs(Former head of
>     KARL Lab)
>  Email; yonglee@yonsei.ac.kr   Homepage; http://mpu.yonsei.ac.kr
>  Phone; 02-392-7194  Cellular; 017-236-2872  Fax; 02-312-4584
>
>
> >
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