Author Topic: Tektronix 465 Repair and Restoration (Read 137107 times)

ModemHead · « **Reply #25 on:** March 18, 2012, 09:37:51 pm »

Thanks for that info, have filed it for future reference. Although after scrubbing the shell thoroughly and flattening out the dents, I decided that even with a few scratches, it probably already looks better than it would after some amatuerish attempt by me to re-paint it.

Spawn · « **Reply #26 on:** March 18, 2012, 11:47:38 pm »

I don’t know about you, but I think it’s a electrician/electronics thing, when it comes to painting and working with wood, I hate it!

I would be happy with couple scratches

That being said, I have to say you did tremendous job there man, I really love the dedication and making something so beautiful

WurliTzerwilly · « **Reply #27 on:** July 07, 2012, 08:13:39 pm »

Great restoration work. Looking good.

There's a difference beetween the 465 and my 465B, as I don't have the trig view button. It's a bandwidth limit switch instead, but no matter.

I've had the 465B since the 1980s when I used it at Centronics where I worked. They 'donated' it to me when they were taken over by Genicom and we finally parted company.

The 'scope has had some use in all those years, but has been stored for a few years and I wouldn't be surprised if some electrolytics have dried out in that time. It was working fully when I loaned it to my son, but when he came to use it recently, there was no trace at all, even when the beam finder was pressed.

As an ex-TV repair man, having checked the power supply voltages, which are very close to tolerance, my instincts told me that there were probably no anode volts being produced, so I rigged up a rough probe with 10 Meg resistors and that does appear to be the case.

There is a procedure in one of the pdfs I have, involving replacing one of the transistors with a resistor and measuring the HV at around -900V, but before I do that and start working backwards, I wonder if you know of any stock faults or easy checks, that would make finding the fault a bit quicker?

Regards,

Alan.

jopki · « **Reply #28 on:** July 07, 2012, 11:10:25 pm »

Well done, it is a beauty! I got myself a dead 475 recently and all it needed for resurrection was a new quad diode rectifier on one of the negative power supplies and a bit of a wiggle of all socketed transistors and ics. It is just slightly off calibration but you have now inspired me to finish the job to make it perfect!

Thanks!

Cheers, JE

uktris · « **Reply #29 on:** August 12, 2012, 10:09:30 pm »

Great restoration, been very helpful as I've just managed to pickup a bargain of a 465 w/DM44 from a lab clearance myself.

Got one dumb question for you though - how on earth did you get the vertical board out without mangling anything ?

The only defect with the unit is that channel 1 V/div knob has become loosened from the switch cam but its proving hard to get at... I'm hoping its just some grub screws that need tightening much like the other switches...

Tris.

ModemHead · « **Reply #30 on:** August 13, 2012, 01:35:49 am »

Quote from: uktris on August 12, 2012, 10:09:30 pm

Got one dumb question for you though - how on earth did you get the vertical board out without mangling anything ? The only defect with the unit is that channel 1 V/div knob has become loosened from the switch cam but its proving hard to get at... I'm hoping its just some grub screws that need tightening much like the other switches...

You're testing my memory, but as I recall, the key for me was getting the 4 nuts off from inside the frame holding the BNC input jacks. The BNC jacks do not need to be loosened, they're attached to this frame, not the front panel. You can see these nuts after removing the two attenuator shields. There are silver, cylindrical 3-legged capacitors in the way, but I discovered they're socketed and fairly easily removed. (Don't swap these caps between channels.) A nutdriver is essential to remove the nuts. There was also a couple of flying resistor leads to be de-soldered at the front for the probe readout function. There was a ground strap to be de-soldered from the bottom interface board. Remove all the associated knobs and buttons from the front, disconnect the wires/cables and remove the screws from the board. The whole assembly (pre-amp board, attenuator cam switches and the PCB they're attached to) can be lifted out.

Hope that helps!

uktris · « **Reply #31 on:** August 14, 2012, 07:40:14 am »

Perfect thank you, I took a deep breath and whipped out the soldering iron and got it all apart

Strangely the actuators are the one piece of flimsy plastic in the entire unit - the v/div cam is only held onto the cam by an interference fit plastic piece which had sheared off...

Only one part that my photos couldn't work out on reassembly which is where the purple/black striped connector from the back of the vertical switch board goes (back of the board behind the main ribbon). I'm pretty sure it goes to the same connector on the interface board that the ribbon connector goes to but trying to trace it via the circuit diagrams.

pyredex · « **Reply #32 on:** August 28, 2012, 08:34:15 pm »

Is there any way someone could tell me where to start looking for problems with the crt? I was given this unit by my father in law, and it seemed to work for a minute or so then the screen went out. Here is a picture or what it does when turned on. Any help is greatly appreciated!

albertr · « **Reply #33 on:** November 04, 2012, 02:39:33 pm »

I'm trying to restore an old 465B I have got recently and need to remove and replace BNC jack for channel 2. Can it be replaced without removing preamp board? Does anyone have experience replacing BNC jacks on these old Tek scopes?

-albertr

TerraHertz · « **Reply #34 on:** December 08, 2012, 06:05:59 am »

It's great to see other people enjoying these old scopes. I generally prefer them to modern ones too, for multiple reasons. Apart from the lack of ability to save waveform images on disk.

One of the best things about this vintage of gear, is that back then the manufacturers were run by engineers, not marketing department and corporate extortionist droids. So they cared for their customers and believed the customers had a right to possess complete technical manuals, including full schematics and maintenance information.
The technical manuals from that era a wonderful thing to behold.

I just thought I'd mention, in case anyone reading this thread isn't aware of it, that it's still possible to obtain full service manuals for all these types of gear. Not just electronic copies, but actual paper originals, in good condition, for quite reasonable prices. There's a busy market in the USA for these manuals. They come up a lot on ebay, but there are also dealers who acquire these manuals in bulk from various sources, warehouse them, and have their inventory in online searchable databases.

Here's my list of old manuals sources. Over the years I've bought physical copies of the manuals for almost all the test gear I have, and find it's _very_ worthwhile to have them. Far easier to use paper copies, than to struggle with awkward poorly scanned pdfs. You just can't beat a big foldout schematic on the benchtop where you're trying to fix something.

Equipment manuals
-----------------
http://electronictrader.webserver.com.au/charles/bookhave.html
http://www.big-list.com/usedmanu.html List of manuals dealers
http://www.w7fg.com/cgibin/cat.cgi?find=F Manuals
http://www.agtannenbaum.com/ service manuals; radio,TV, VCR, as well as
Antique, Amateur, Audio, and Test Equipment.
http://www.slack.com/manavail.html
http://www.spies.com/~dd/manuals.html
http://www.manualserver.com/hpmanuals5.htm
http://www.test.it/elettronica/MANUALS.HTML All copies. Big range.
http://www.manualsplus.com/
http://www.magma.ca/~howardr/manuals.htm
http://www.fullnet.com/u/tomg/gooteesu.htm
http://www2.ocn.ne.jp/~handf/manual.htm
http://www.manualmerchant.com/
fanemerald2@yahoo.com ebay testequip4sale
ebay: bkfowler email: intvguy@cox.net
http://www.radioera.com/mall/newacquisitions.asp
http://www.sarrio.com/sarrio/hpmanuals.html
http://motocom.com/site_index.html RepairManual.com repair manuals for motorcycles, cars, trucks, tractors
http://www.manualscenter.com/ akai am-u02 $14

Your Manual Source <yms@usimperio.com> (Carla)
http://www.usimperio.com/
http://www.consolidatedsurplus.com/search.htm (Manuals)
Consolidated Surplus
P.O. Box 106
Ellicott City, MD 21041
410-685-1991

http://www.surplussales.com/Manuals/ManTestEqpt.html Test Equipment
http://www.manualsplus.com Manuals Plus Corporate Page
http://sphere.bc.ca/test/manuals.html Sphere's Used Electronic Test Equipment Information - Manuals and Parts
http://www.candrnet.com.au
http://www.macservice.com.au Macservice Pty Ltd
http://www.manualserver.com MANUAL SERVER Automotive aircraft electronics diagrams
http://www.manualserver.com/hpmanuals5.htm HP Computer Manuals HP54121Tscope
http://www.surplussales.com/Manuals/ManTestEqpt.html Manuals: Test Equipment
http://www.yourmanualsource.com Test Equipment Manuals Search Form
http://www.plotterpens.com/xypens.htm imagingproducts1 XY Recorder Pens for obsolete HP
http://www.hi-manuals.com/index.html

http://bama.sbc.edu Boat anchor manual archive DjVu format better than pdf!
http://bama.edebris.com/manuals/tek/ Mirror of same

http://manoman.sqhill.com/ manuals, online for free, plus lists of sources.
http://www.ebaman.com
http://www.ko4bb.com/manuals/
http://www.eserviceinfo.com

http://www.tech-man.com/ Technical Manuals Online
http://www.ko4bb.com/manuals/ Great! User uploads. Also Firmware.

ARTEK MEDIA HAS MOVED !!!!!! ( AND WE CHANGED OUR NAME)
New name: ArtekManuals
New web: www.Artekmanuals.com
New email: manuals@ArtekManuals.com

http://bama.edebris.com/manuals/tek/ free Tektronix manuals

edit to add:
http://www.ietlabs.com/pdf Includes a lot of General Radio docs.
http://www.ietlabs.com/pdf/Manuals/

ModemHead · « **Reply #35 on:** December 08, 2012, 12:26:12 pm »

Quote from: TerraHertz on December 08, 2012, 06:05:59 am

... Here's my list of old manuals sources. ...

I recently told another forumite that using the service manual to troubleshoot something 'felt like cheating'.

Thanks for compiling comprehensive list of very useful info. Consider putting it in the EEVBlog Wiki?

robrenz · « **Reply #36 on:** December 31, 2012, 12:35:12 am »

Awesome job ModemHead! This is the thread I was thinking of when I said others have covered a lot of restoration stuff that I didn't bother putting in my 7603 restoration. Nice descriptions of diagnosing and fixing the problems

ModemHead · « **Reply #37 on:** December 31, 2012, 04:32:40 am »

Thanks robrenz. I really enjoyed seeing your handiwork as well. I can't match your skill with metals and materials, mine still has a lot of 'character'.

But it still works great and it's the first thing I turn on when I just want to have a look at something.

BMac · « **Reply #38 on:** January 29, 2013, 02:16:22 pm »

Anybody got a source for vintage tektronix knobs for my 485, need CH1 & 2 Vertical Select.

366-1166-00 and 366-1338-00

Thanks!

BMac

Ronbo · « **Reply #39 on:** January 30, 2013, 05:08:13 pm »

Great post and nice work! These scopes are real workhorses. I bought mine used about 14 years ago from a guy in Dayton, Ohio that worked at NEC and he had about 10 of them he obtained as surplus. I drove up from Cincinnati and got to take my pick from a stack he had in his garage. Super nice guy. If I remember right I paid around $125, and as I was leaving he reached in to a box, grabbed some probes and said "here, take these".

When I got home and unloaded things I noticed that along with the pair of regular 100 mhz probes, he had thrown in a Tektronix current probe. I listed it on eBay and the sale covered the cost of the scope and then some. It was a lucky deal.

Anyway, this thing is still chugging along, and the only thing I've done use some deoxit on a few of the contacts. One of these days I'm going to give it a good cleaning and alignment...

PaulAm · « **Reply #40 on:** January 30, 2013, 06:13:48 pm »

Quote from: pyredex on August 28, 2012, 08:34:15 pm

Is there any way someone could tell me where to start looking for problems with the crt? I was given this unit by my father in law, and it seemed to work for a minute or so then the screen went out. Here is a picture or what it does when turned on. Any help is greatly appreciated!

Probably an open filter cap. Check all the power supply voltages. You can get a service manual free online

Giddie · « **Reply #41 on:** April 08, 2013, 12:20:20 pm »

I got hold of an old Tektronix 466 (the Analogue Storage model). The eBay listing gave the impression (to me, at least) that it was in working condition, if a bit worse for wear. However, there's a lot of very nasty corrosion inside and it's developed several faults in transit (presumably). I'm making slow progress, but my main concern is that almost all the push-switches are so badly affected by corrosion that they barely give at all when I push them. Does anyone know if there's anything that can be done to replace them, or even take them apart and fix them?

frank58 · « **Reply #42 on:** April 28, 2013, 01:06:46 pm »

May anyone help me with my tek 465 m ?
I have switch on it after a long time.
I have the settiings how in figures, the traces are that.
May the problem to be the settings ?
Thank for help

Giddie · « **Reply #43 on:** April 29, 2013, 08:48:13 am »

I had a similar issue that I just fixed in my 466, and I think it must be a very similar thing that's happened to you. In the 466, there's an axial electrolytic that filters the power rail in the horizontal amplifier circuit. Because it was old, it had leaked, which had caused a nearby resistor to corrode and go open-circuit. The resistor was just before the horizontal amplifier calibration pot, so the open-circuit was basically forcing the horizontal gain to just below its absolute minimum calibration point. I believe it was a 220? resistor. Maybe worth a check?

Dick · « **Reply #44 on:** June 08, 2013, 03:18:56 am »

Beautiful job. Great looking lab. Really appreciate the quality of your photography! Your work give me courage to remove the froont-end board. My high voltage quit. ie -2500 reads -50V. I bought the scope in 1967! Thanks again dick

Dick · « **Reply #45 on:** July 09, 2013, 02:14:18 am »

Trying to remove the vertical pre-amp board. Doing it per manual but got to the point where it says to disconnect the Delay Line.
This looks tricky ie it's soldered in or am I missing something? I can see from your post,which is beautiful, that you did it
Looks like a solder sleeve and two conductors into the board. Would appreciate your comment. dick hoffman

ModemHead · « **Reply #46 on:** July 09, 2013, 03:42:33 am »

The delay line is the easy part. Just unsolder the shield tabs. A solder-sucker will help. The two conductors go into sockets just like the coax peltola connectors, so the they will pull right out.

FStephenmasek · « **Reply #47 on:** July 21, 2013, 10:29:18 pm »

Thanks for this helpful thread! I do not think mine 465 is working properly. I collect and restore old radios. Trying to use it to align FM radios, the trace is fuzzy and not shaped properly. Trying to align and AM radio today, I have two traces when there should be one.

Do you know of any good Tektronix service places in southern California?

Dick · « **Reply #48 on:** August 13, 2013, 03:14:35 pm »

Got the vertical preamp board off after fighting the nuts on the BNC connectors. Verified the Voltage Multiplier is shorting. Would appreciate any help on how I remove and replace it dick

Filter_head · « **Reply #49 on:** October 25, 2013, 01:37:01 am »

I have a 465 that recently developed a vertical deflection symptom. The vertical position knob, both CH1 and CH2, has limited amount of vertical adjustment. For example, turning from hard left to hard right will deflect the rastering beam about 1.8 div max. out of the 8/div total on the screen.

Can't center the rastering beam on the center of the display either. Horizontal display, time/div appears fine.

I have a 465 I can scavenge for parts (dead CRT) and though about swapping the vertical deflection board.

Any other suggestions ladies and/or gents?


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Author Topic: Tektronix 465 Repair and Restoration (Read 137107 times)

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