Tek2465b no trace! - Page 1
Forum section: electronics / repair

author: Teknow
author_rank: Regular Contributor
timestamp: October 24, 2016, 06:20:23 pm
content: Hi everyone,Today, my Tek2465b stopped working. I used it for about an hour then I turned it off for about 20 Minutes. And when I came back to work on a circuit, I turned it on but it ran no self test, instead it jumps to only the trigger LED flashing!There are no traces or signs on the screen, it's off!Neither the focus, nor the intensity nor the beam finder works!I turned it off and on many times after cooling it, though not hot, but nothing changed.I wonder if someone has ever a similar fault or can help me where to start. The fan is working, the fuses are all OK the five volts in the logic area are present!I bought this device an changed almost all capacitors in the power board and the three leaking smd capacitors! The U800 has been supported with extra heat sink!

author: singapol
author_rank: Frequent Contributor
timestamp: October 24, 2016, 06:55:42 pm
content: Try reseating connectors..that is removing them and pluging them back in. This is the easiest to do because Idon't know your repair skill level.

author: Teknow
author_rank: Regular Contributor
timestamp: October 24, 2016, 08:31:51 pm
content: Thanks a lot, I tapped on it, and it worked fine! Should I use some cleansing spray for the contacts like WD-40, for instance?

author: tggzzz
author_rank: Super Contributor
timestamp: October 24, 2016, 09:09:26 pm
content: Quote from: Teknow on October 24, 2016, 08:31:51 pmProbably not WD40, since that is principallyt forWaterDisplacement.Many people recomment Caig DeOxit products. Their website is extremely poor about guiding you to which is most useful for your circumstances.

author: Teknow
author_rank: Regular Contributor
timestamp: October 25, 2016, 08:40:57 am
content: The humidity level in my apartment calls for placing some silica gel bags inside the device. Caig's products are not available in my vicinity. I think I can find some Kontakt products somewhere around here.

author: Zucca
author_rank: Unknown
timestamp: October 25, 2016, 09:42:46 am
content: Quote from: tggzzz on October 24, 2016, 09:09:26 pmwell...http://www.ietlabs.com/pdf/Manuals/1433_im.pdfPage 8:QuoteIn my personal experience WD-40 is fantastic to remove old crap on metal surfaces (not plastic, since WD40 attak plastic material), then when you have a clean area put something for the long term (Deoxit, contact grease, etc.).Just my $.02.

author: tggzzz
author_rank: Super Contributor
timestamp: October 25, 2016, 12:37:24 pm
content: YesThere is a lot of "personal experience" and "sales literature", and it is very difficult to distinguish truth from fiction.I've just used atinyamount of Deoxit while resurrecting a Tek 485. A timebase relay had been inserted backwards (actually an easy mistake!) and when inserted correctly it was making intermittent contact with the socket. A pin-head sized drop of Deoxit on each socket contact, some waggling, and it is perfectly satisfactory.Be aware that different plastics are susceptible to different chemicals (even IPA in some cases, apparently), and it is very difficult to know what will/won't happen. Theg only global statement is therefore to try the chemical on an unimportant part, and wait several hours to see what happens.