[TechAssist] Re: Tektronix 485 Oscilliscope - Power Supply Cycling ON/OFF - FIXED
- From: Ed Gaidies <teltek@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 25 Feb 2005 11:17:36 -0500
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
>>>>>>>
>>>>>>>
>>>>>>>
>>>>------------------------------------------------------------------------
>>>>
>>>>
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>
>
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>>>>>>
>>>>>>Peter Neal
>>>>>>Neal Electronics
>>>>>>1905 E. Wm.Cannon
>>>>>>Austin,TX 78756
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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>>>>>Peter Neal
>>>>>Neal Electronics
>>>>>1905 E. Wm.Cannon
>>>>>Austin,TX 78756
>>>>>
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>>>>>
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>>>>>
>>>>>
>>>>>
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--
Ed Gaidies
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
teltek@xxxxxxxxx
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