Tektronix 475 oscilloscope - gone bad

Urban · 12th July 2004, 09:32 PM

Hi

Is there possibly anyone out there with a tech manual (as pdf) for this old beauty ?

I have no vissible sweep...

I think the supply has gone bad (or possibly just current limiting) I have +40V on the +50V regulated TP.

A scan of the PSU schematic would really be helpfull.

serial is: 101720

/Urban

Sch3mat1c · 12th July 2004, 11:50 PM

I've got the manual in 6.6MB of .PDF but it doesn't have a complete schematic anywhere, just segments.

Tim

Greg Erskine · 13th July 2004, 07:14 AM

Hi Urban,

I know this brief article is about the 465 but it may lead somewhere.

http://www.siliconchip.com.au/cms/A_101933/article.html

AKSA · 13th July 2004, 08:20 AM

Urban,

I've not pulled one down, but I have a 466 Storage Tek, beautiful CRO.

I'm led to believe that the power supply frequently falls over. I think it's a voltage tripler, and the caps are highly stressed. It's also used in a variety of other Tek CROs, and is therefore not too hard to fix.

Check the voltage tripler!

Cheers,

Hugh

Urban · 13th July 2004, 08:40 AM

I have found lots of goodies at: http://bama.sbc.edu/

Beware though the FTP is very slow, so you probably will have to try and try again.

Hmm. Voltage trippler. Will check. With one hand in my pocket...

/Urban

tekman · 14th October 2004, 09:34 AM

Try bama.edebris.com instead- much faster download, more simultaneous logins (= less long wait queue)

I've a 475 Service manual complete, so simply ask via personal mail ( PM ).

If really the HV multiplier failed, look for a junker 475 or 475A.

465, 485 won't work !

If you need more help, send a PM, may be I can help since we are both in europe located.

hth,

Rahul · 14th October 2004, 10:11 AM

Hi!

Try this link. You may have to register but lot of useful stuff is available for download.

http://teknetelectronics.com/srequest.asp

I got a manual for my 2565B here.

Regards

Rahul

Urban · 14th October 2004, 10:22 AM

Hi

Thanks for the links !

I finaly sorted my 475 out. The big cap in the +50V supply had gone to his maker. Rather basic perhaps but not too easy to find without a working oscilloscope and a manual.....

/Urban

djQUAN · 3rd June 2011, 02:17 PM

Upping the ancient thread for my ancient scope...

Does anyone have a schematic for this scope (Tek 475A)

Mine just quit working and the mess of parts makes troubleshooting difficult. All fuses are good, the main supply caps have voltage but seems all the discrete regulators are dead as all regulated rails are 0V.

djQUAN · 8th June 2011, 07:39 AM

Sooooo..... some searching with google led me to Tek's site where I had to fill up a form and got a 64MB PDF file service manual with schematics and BOM for the 475 scope. Seems identical to my 475A but not exactly sure what are the differences between the two. But the boards and powersupply appear to be the same. I'll check my scope out this weekend.

12th July 2004, 09:32 PM	#1
Urban diyAudio Member Join Date: Mar 2003 Location: Stockholm	Tektronix 475 oscilloscope - gone bad Hi Is there possibly anyone out there with a tech manual (as pdf) for this old beauty ? I have no vissible sweep... I think the supply has gone bad (or possibly just current limiting) I have +40V on the +50V regulated TP. A scan of the PSU schematic would really be helpfull. serial is: 101720 /Urban

12th July 2004, 11:50 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	I've got the manual in 6.6MB of .PDF but it doesn't have a complete schematic anywhere, just segments. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

13th July 2004, 07:14 AM	#3
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	Hi Urban, I know this brief article is about the 465 but it may lead somewhere. http://www.siliconchip.com.au/cms/A_101933/article.html __________________ Greg Erskine

13th July 2004, 08:20 AM	#4
AKSA diyAudio Member Join Date: Sep 2001 Location: Melbourne, Australia	Urban, I've not pulled one down, but I have a 466 Storage Tek, beautiful CRO. I'm led to believe that the power supply frequently falls over. I think it's a voltage tripler, and the caps are highly stressed. It's also used in a variety of other Tek CROs, and is therefore not too hard to fix. Check the voltage tripler! Cheers, Hugh __________________ Aspen Amplifiers P/L (Australia) www.aksaonline.com

14th October 2004, 10:11 AM	#7
Rahul diyAudio Member Join Date: Mar 2004 Location: Lucknow , North central India	Hi! Try this link. You may have to register but lot of useful stuff is available for download. http://teknetelectronics.com/srequest.asp I got a manual for my 2565B here. Regards Rahul __________________ We can make it work


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13th July 2004, 08:40 AM	#5
Urban diyAudio Member Join Date: Mar 2003 Location: Stockholm	I have found lots of goodies at: http://bama.sbc.edu/ Beware though the FTP is very slow, so you probably will have to try and try again. Hmm. Voltage trippler. Will check. With one hand in my pocket... /Urban

14th October 2004, 09:34 AM	#6
tekman diyAudio Member Join Date: Oct 2004	Try bama.edebris.com instead- much faster download, more simultaneous logins (= less long wait queue) I've a 475 Service manual complete, so simply ask via personal mail ( PM ). If really the HV multiplier failed, look for a junker 475 or 475A. 465, 485 won't work ! If you need more help, send a PM, may be I can help since we are both in europe located. hth,

14th October 2004, 10:22 AM	#8
Urban diyAudio Member Join Date: Mar 2003 Location: Stockholm	Hi Thanks for the links ! I finaly sorted my 475 out. The big cap in the +50V supply had gone to his maker. Rather basic perhaps but not too easy to find without a working oscilloscope and a manual..... /Urban

3rd June 2011, 02:17 PM	#9
djQUAN diyAudio Member Join Date: May 2004 Location: manila	Upping the ancient thread for my ancient scope... Does anyone have a schematic for this scope (Tek 475A) Mine just quit working and the mess of parts makes troubleshooting difficult. All fuses are good, the main supply caps have voltage but seems all the discrete regulators are dead as all regulated rails are 0V.

8th June 2011, 07:39 AM	#10
djQUAN diyAudio Member Join Date: May 2004 Location: manila	Sooooo..... some searching with google led me to Tek's site where I had to fill up a form and got a 64MB PDF file service manual with schematics and BOM for the 475 scope. Seems identical to my 475A but not exactly sure what are the differences between the two. But the boards and powersupply appear to be the same. I'll check my scope out this weekend.

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