David; Once you flash up the scope...it puts the Labor out of reach for most. It's sits on my bench...real pretty like...just for effect. Kidding. I use it periodically, but not as often as I used to. -Ed- David Lessard wrote: >Now I hope Hollis has not read your email Ed...he has been preaching the >oscilliscope to us for years now. Without how is one supposed to confirm a >micro's oscillator is running, without one how can one confirm the >micro/eprom activity on a CTC177 chassis is correct, without one how can I >check AC ripple on a bad power supply, and these are just a few examples. I >don't know about you Ed but I couldn't work as effectively without my scope. >%70 of time a DMM will do, but one day you'll need to dust off that old >scope. > >David Lessard >Alexandria, Ontario, Canada >mr_fixit@xxxxxxxxxxxx > >----- Original Message ----- >From: "Ed Gaidies" <teltek@xxxxxxxxx> >To: <techassist@xxxxxxxxxxxxx> >Sent: Thursday, February 24, 2005 10:21 PM >Subject: [TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply Cycling >ON/OFF - FIXED > > > > >>Al; >>Sorry to say...these days, providing you know what your scope should >>show...and actually getting a Manual for scope traces..mine has gathered >>dust. >> >> >> >>-Ed- >> >>teltek413@xxxxxxxxxxxx >> >> >> >> >>>From: Al Gutz <alg@xxxxxxxxxxx> >>>Reply-To: <techassist@xxxxxxxxxxxxx> >>>Date: Thu, 24 Feb 2005 22:11:16 -0500 >>>To: <techassist@xxxxxxxxxxxxx> >>>Subject: [TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply >>> >>> >Cycling > > >>>ON/OFF - FIXED >>> >>>A new Tektronix TDS224 100 meg 4 channel with accessories runs about >>>$5000, why not repair. >>>Al G >>> >>>Electric Medic wrote: >>> >>> >>>>I wish I could get my 2216 repaired. I bought it new in 1996 and it >>>> >>>> >died > > >>>>last year, no power. It is just sitting on a shelf collecting dust, I >>>>thought it was a lost cause. You mean you all actually repair these? >>>> >>>>Perry Bower >>>>Electric Medic >>>>"It's Cheaper to Keep Her" >>>>http://www.electricmedic.com >>>>Check out the Electronic Repair Screensaver We created. More Images to >>>> >>>> >come! > > >>>>To download these Collections you must first install the Eyetide >>>> >>>> >Viewer: > > >http://www.eyetide.com/download/?s=O3OfmSLHXygGHCv1W6Gz3Bgjtq3DNNMNdcKsYSVGC > > >>>>"We're Number One Where it Really Counts, With our Customers" >>>>3850 Washington Road Suite 5b >>>>Martinez, Georgia 30907 >>>>Phone: 706-8MEDIC4 (863-3424) >>>>Phone: 706-863-3474 >>>>Fax: 706-863-2316 >>>>mailto:info@xxxxxxxxxxxxxxxxx >>>>"WE REPAIR WITH CARE" >>>> >>>> >>>>-----Original Message----- >>>>From: techassist-bounce@xxxxxxxxxxxxx >>>>[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of David Lessard >>>>Sent: Wednesday, February 23, 2005 10:18 PM >>>>To: techassist@xxxxxxxxxxxxx >>>>Subject: [TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply >>>>Cycling ON/OFF - FIXED >>>> >>>> >>>>They sure are, I couldn't have traced this short without one. The (- >>>> >>>> >5V) > > >>>>power distributes everywhere. This was a great experience for me, now >>>> >>>> >I'll > > >>>>be able to service this thing forever...oh yeah...most of the parts are >>>>obsolete now...forgot this thing is 30+ years old. You couldn't tell by >>>> >>>> >the > > >>>>way it works. >>>> >>>>David Lessard >>>>Alexandria, Ontario, Canada >>>>mr_fixit@xxxxxxxxxxxx >>>> >>>>----- Original Message ----- >>>>From: <majorthom@xxxxxxxxxxxxx> >>>>To: <techassist@xxxxxxxxxxxxx> >>>>Sent: Wednesday, February 23, 2005 10:05 PM >>>>Subject: [TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply >>>> >>>> >Cycling > > >>>>ON/OFF - FIXED >>>> >>>> >>>> >>>> >>>> >>>>>Aren't schematics great >>>>>Pete >>>>>David Lessard <mr_fixit@xxxxxxxxxxxx> wrote: >>>>>FIXED >>>>> >>>>>These things are built like brick sh*! houses. After acquiring a >>>>> >>>>> >schematic > > >>>>I >>>> >>>> >>>> >>>>>discovered a shorted C852 (.47uf) on the attenuator board - PS >>>>> >>>>> >decoupling > > >>>>>capacitor shorting (-5V) to ground. All power supply current is >>>>> >>>>> >monitored, > > >>>>>shorts or excessive loads cause the power supply to shutdown. In this >>>>> >>>>> >case > > >>>>>the power supply was restarting, over and over again, about 3 times a >>>>>second. While I had it opened I cleaned all the switches and >>>>>potientiometers. Signals look better then ever. >>>>> >>>>>David Lessard >>>>>Alexandria, Ontario, Canada >>>>>mr_fixit@xxxxxxxxxxxx >>>>> >>>>>----- Original Message ----- >>>>>From: >>>>>To: >>>>>Sent: Tuesday, February 22, 2005 1:23 AM >>>>>Subject: [TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply >>>>> >>>>> >>>>Cycling >>>> >>>> >>>> >>>>>ON/OFF >>>>> >>>>> >>>>> >>>>> >>>>> >>>>>>I love these old TEK's >>>>>>On and on >>>>>>I'm replying because I have the complete S/M [1" thick]Maybe I send >>>>>> >>>>>> >you > > >>>>a >>>> >>>> >>>> >>>>>schema of a cktif you like >>>>> >>>>> >>>>> >>>>>>Regards, >>>>>>Pete I mennt the 475A:they are very similar,Pete >>>>>>Wally Heise wrote: >>>>>>David, >>>>>> >>>>>>I don't know if the 485 is similar to the 465 scope, but my 465 died >>>>>> >>>>>> >>>>last >>>> >>>> >>>> >>>>>>year. I traced the problem to the sealed high voltage module which is >>>>>> >>>>>> >no > > >>>>>>longer available from Tektronix. My scope would power up when I >>>>>> >>>>>> >removed > > >>>>>>this module, except no high voltage of course. I still have service >>>>>> >>>>>> >>>>manual >>>> >>>> >>>> >>>>>>but gave the scope to a friend. Hope that helps in troubleshooting >>>>>> >>>>>> >it. > > >>>>>>Wally Heise >>>>>>South Isle Repair >>>>>>Isle, Mn. >>>>>>sirepair@xxxxxxxxxx >>>>>> >>>>>> >>>>>> >>>>>>----- Original Message ----- >>>>>>From: "David Lessard" >>>>>>To: >>>>>>Sent: February 21, 2005 7:31 PM >>>>>>Subject: [TechAssist] Tektronix 485 Oscilliscope - Power Supply >>>>>> >>>>>> >Cycling > > >>>>>>ON/OFF >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>>>Hello All, My week just got tougher, my scope failed today. I may >>>>>>> >>>>>>> >need > > >>>>a >>>> >>>> >>>> >>>>>>scope to fix my scope. When powered "ON" I can hear the power supply >>>>>>cycling - on/off/on, etc. The rear fan starts to spin and panel >>>>>> >>>>>> >lights > > >>>>>start >>>>> >>>>> >>>>> >>>>>>to light up but only when the power supply is on for that brief 1/2 >>>>>> >>>>>> >>>>>second. >>>>> >>>>> >>>>> >>>>>>Would anyone have a schematic of the power supply or tips. >>>>>> >>>>>> >>>>>> >>>>>>>Thank you, >>>>>>>David Lessard >>>>>>>mr_fixit@xxxxxxxxxxxx >>>>>>> >>>>>>> >>>>>>> >>>>------------------------------------------------------------------------ >>>> >>>> >-- > > >>>>>>--- >>>>>> >>>>>> >>>>>> >>>>>>>Lost Password: >>>>>>>http://www.tech-assist.org and select "Login Problems?". >>>>>>>Email Archives: >>>>>>>//www.freelists.org/archives/techassist/ >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>------------------------------------------------------------------------ >>>> >>>> >-- > > >>>>>--- >>>>> >>>>> >>>>> >>>>>>Lost Password: >>>>>>http://www.tech-assist.org and select "Login Problems?". >>>>>>Email Archives: >>>>>>//www.freelists.org/archives/techassist/ >>>>>> >>>>>> >>>>>>Peter Neal >>>>>>Neal Electronics >>>>>>1905 E. Wm.Cannon >>>>>>Austin,TX 78756 >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>------------------------------------------------------------------------ >>>> >>>> >-- > > >>>>>--- >>>>> >>>>> >>>>> >>>>>>Lost Password: >>>>>>http://www.tech-assist.org and select "Login Problems?". >>>>>>Email Archives: >>>>>>//www.freelists.org/archives/techassist/ >>>>>> >>>>>> >>>>> >>>>> >>>>------------------------------------------------------------------------ >>>> >>>> >-- > > >>>>--- >>>> >>>> >>>> >>>>>Lost Password: >>>>>http://www.tech-assist.org and select "Login Problems?". >>>>>Email Archives: >>>>>//www.freelists.org/archives/techassist/ >>>>> >>>>> >>>>>Peter Neal >>>>>Neal Electronics >>>>>1905 E. Wm.Cannon >>>>>Austin,TX 78756 >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>------------------------------------------------------------------------ >>>> >>>> >-- > > >>>>--- >>>> >>>> >>>> >>>>>Lost Password: >>>>>http://www.tech-assist.org and select "Login Problems?". >>>>>Email Archives: >>>>>//www.freelists.org/archives/techassist/ >>>>> >>>>> >>>> >>>> >>>> >>>------------------------------------------------------------------------- >>> >>> >--- > > >>>>- >>>>Lost Password: >>>>http://www.tech-assist.org and select "Login Problems?". >>>>Email Archives: >>>>//www.freelists.org/archives/techassist/ >>>> >>>> >>>> >>>> >>>------------------------------------------------------------------------- >>> >>> >---- > > >>>>Lost Password: >>>>http://www.tech-assist.org and select "Login Problems?". >>>>Email Archives: >>>>//www.freelists.org/archives/techassist/ >>>> >>>> >>>> >>> >>> >>-------------------------------------------------------------------------- >> >> >--- > > >>>Lost Password: >>>http://www.tech-assist.org and select "Login Problems?". >>>Email Archives: >>>//www.freelists.org/archives/techassist/ >>> >>> >> >>-------------------------------------------------------------------------- >> >> >--- > > >>Lost Password: >>http://www.tech-assist.org and select "Login Problems?". >>Email Archives: >>//www.freelists.org/archives/techassist/ >> >> > > >----------------------------------------------------------------------------- >Lost Password: >http://www.tech-assist.org and select "Login Problems?". >Email Archives: >//www.freelists.org/archives/techassist/ > > > -- Ed Gaidies Tel-Tek Electronics Ontario-Canada teltek3@xxxxxxxxxxxx teltek@xxxxxxxxx ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". 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