Author Topic: Help with Tektronix 2213 repair  (Read 900 times)

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Offline soundaudiorepair

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Help with Tektronix 2213 repair
« on: April 03, 2018, 10:17:57 pm »
Hi All,

My oscilliscope broke  :'( . It no longer displays anything on the crt display. It still hums when I turn it on.

I got the service manual and started working through the troubleshooting flow chart.

The Low Voltage Power rails were all half of what they should be, except for the 5v rail which was about .25v.

The next step was measuring voltage across VR938, with pins 1 and 2 of U931 shorted, while bringing up on a variac to no more then 85VAC RMS. It should be around 42v, I have 15v.

The current step is shorting the base of Q956 to TP934 and checking that voltage again.

But I don't have a TP934 on my board. I see it on the physical layout diagram but it is not in that spot on my unit. Also my service manual appears to be missing schematics for the power supply, I just have a parts list. So I can't look up what would be equivalent to TP934, or figure out which leg of Q956 is the base.

Please help me proceed. This is the service manual I'm working from: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjbov35jp_aAhWrq1QKHfyGDfAQFggnMAA&url=http%3A%2F%2Fw140.com%2Ftektronix_2213_service.pdf&usg=AOvVaw33NZRDPHQKrBMCF3sph-zo
 

Offline cheeseit

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Re: Help with Tektronix 2213 repair
« Reply #1 on: April 05, 2018, 12:47:18 am »
From KOBB, this SM is 13 pages longer and I believe it has the PS schematic you need on page 206-207.
 
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Offline soundaudiorepair

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Re: Help with Tektronix 2213 repair
« Reply #2 on: April 05, 2018, 12:59:20 am »
YES! Thanks you so much.

Sam
 

Offline Chris56000

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Re: Help with Tektronix 2213 repair
« Reply #3 on: April 08, 2018, 04:54:24 pm »
Hi!

Quote
From KOBB, this SM is 13 pages longer and I believe it has the PS schematic you need on page 206-207

I can think about buying one as a project now there's a complete S.M. with all the pages in it!

Chris Williams
It's an enigma that's what it is!! This thing's not fixed because it doesn't want to be fixed!!
 


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