tektronix 2245a problems - Page 1
Forum section: electronics / repair

author: bigbigbigern
author_rank: Newbie
timestamp: November 02, 2016, 08:12:44 pm
content: change battery to 3 volt with holder.like cpu board.now wont go in menu.the lights go out.

author: bigbigbigern
author_rank: Newbie
timestamp: November 02, 2016, 09:38:04 pm
content: can anyone help? reset the ribbons.still the same ?

author: tggzzz
author_rank: Super Contributor
timestamp: November 03, 2016, 12:24:42 am
content: incomplete sentences.strangepunctuation,pictures fuzzyhttps://entertaininghacks.wordpress.com/library-2/good-questions-pique-our-interest-and-dont-waste-our-time-2/

author: singapol
author_rank: Frequent Contributor
timestamp: November 03, 2016, 03:04:36 am
content: Quote from: bigbigbigern on November 02, 2016, 08:12:44 pmThe picture tells a different story? What lights go out? Please be exact or specific , we are not mind readers.Why did you change the battery and what's it for? There are so many tek scope models that you have to give details of what failures you have on this scope model. Please be patient and you will be served.Have you downloaded the service manual?

author: MosherIV
author_rank: Super Contributor
timestamp: November 03, 2016, 04:36:54 pm
content: QuoteThis might make sense to you but to the rest of us this is total garbage and makes no sense what so ever !QuoteI agree with this.If you want help, you will have to use properly constructed sentences and grammar (American standards will do).No one is interested in an argument about this. We will help you - if you help us.

author: bigbigbigern
author_rank: Newbie
timestamp: November 03, 2016, 04:51:40 pm
content: OK what happened turned the scope on.it would go into menu then would configure. Then would say warning battery failed restart.Well i took the 3v Panasonic lithium battery out. Soldered wires in the place of where the battery was soldered. Used a battery holder like one,s on motherboards. 3v disc lithium battery i used instead of the old style battery. Yes all wires and are plugs are right.Now it go,s into start up menu lights up.Volts time and the buttons don.t work now.Hit auto setup sort of works.But the screen is small .Does not look right. Press the c1 and alt for menu freezes menu mode .Have to shut the scope off .Before it will restart again might be 30 minutes.

author: bigbigbigern
author_rank: Newbie
timestamp: November 03, 2016, 04:57:28 pm
content: Have been reading the service and operators manual .Over and over again.

author: singapol
author_rank: Frequent Contributor
timestamp: November 03, 2016, 05:16:31 pm
content: Quote from: bigbigbigern on November 03, 2016, 04:57:28 pmYou should read Theory of operation Chapter3 of service manual to familarise yourself about how the scope works.I suspect your battery holder mod cause this fault. Did you insulate the bottom of battery holder since this one is for pcb use? If not you could have shorted something. Since the LED lights are missing it means the +5 volt supply is missing. Read the relevant section of chapter 3 for understanding. After that you can locate the frontpanel schematic and see where the +5V is used/connected and try to measure with multimeter if this 5V is present. If not work backwards to A2 board/schematic for 5V low voltage regulator. Good luck for now.A smaller file from the same site: Wait for Processing to change to Get manual.85Mb file: 330 pg.http://elektrotanya.com/tektronix_2445a_2455a_sm.pdf/download.html

author: bigbigbigern
author_rank: Newbie
timestamp: November 03, 2016, 05:42:42 pm
content: Thank you i did insulate both positive and negative .I will read the chapter .Thanks again .