[TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply Cycling ON/OFF - FIXED
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 25 Feb 2005 22:41:36 -0500
We do that every day. We also ressurect.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "becyn" <becyn@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, February 25, 2005 8:45 PM
Subject: [TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply Cycling
ON/OFF - FIXED
> Hmmm, whats next? Repair by laying hands upon the unit?
> ...or psychic channeling of the estimate? Wow!
> I think I'm gonna open a "Repair Ministry"! Halalluya brother!!!!
> (now pass the plate....)
>
> Jim McVey
> McVey Alltronix
> 327 Broadway
> Newburgh N.Y. 12550
>
> "If it doesn't play...
> CALL MCVEY !!!!!!"
> Factory authorized
> service for over 20
> major brands.
> 845 561 8383
> (Last of the Mohegans)
>
> majorthom@xxxxxxxxxxxxx wrote:
>
> >OK OK Had to add my two cents worth:I use my TEK more than my DVM-Well
maybe 50/50.One can do anything with a scope[if one is familiar]
> >Back in 1960,I worked for a place called Planet Audio in Manhattan w/a
tech named Hi[for Hiram] and he was a real good tech[fixed more per day than
me]
> >Hiram knew zero theory[0] He would feel parts for temp,Inspect visually
for burned parts and he would listen to his equipment.He would lick his
finger and feel or provide an AC drive signal for Vert.,for example.That
Hiram was a trip.
> >So much for war stories.
> >
> >Regards all,Pete
> >Kevin <kevintv@xxxxxxx> wrote:
> >Can't you do most of that by using a frequency counter?
> >
> >Kevin Wilks
> >Kevin's TV & Video Repair
> >Penticton BC Canada
> >kevintv@xxxxxxx
> >
> >
> >-----Original Message-----
> >From: techassist-bounce@xxxxxxxxxxxxx
> >[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> >Sent: Friday, February 25, 2005 7:55 AM
> >To: techassist@xxxxxxxxxxxxx
> >Subject: [TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply
> >Cycling ON/OFF - FIXED
> >
> >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"
> >To:
> >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
> >>>Reply-To:
> >>>Date: Thu, 24 Feb 2005 22:11:16 -0500
> >>>To:
> >>>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=O3OfmSLHXygGHCv1W6Gz3Bgjtq3DNNMNdcKsY
> >SVGC
> >
> >
> >>>>"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:
> >>>>To:
> >>>>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 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
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >------------------------------------------------------------------------
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> >
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> >>>>>>Neal Electronics
> >>>>>>1905 E. Wm.Cannon
> >>>>>>Austin,TX 78756
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> >>>>>Neal Electronics
> >>>>>1905 E. Wm.Cannon
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> >
> >Peter Neal
> >Neal Electronics
> >1905 E. Wm.Cannon
> >Austin,TX 78756
> >
> >
> >
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