Comments on: Repairing front panel buttons of Tektronix 7904 oscilloscope. http://www.circuitsathome.com/measurements/repairing-front-panel-buttons-of-tektronix-7904-oscilloscope A Solder Joint Sat, 04 Sep 2010 05:52:05 -0600 http://wordpress.org/?v=2.8.6 hourly 1 By: wulfman http://www.circuitsathome.com/measurements/repairing-front-panel-buttons-of-tektronix-7904-oscilloscope/comment-page-1#comment-6148 wulfman Thu, 02 Sep 2010 21:28:53 +0000 http://www.circuitsathome.com/?p=2705#comment-6148 Nice project. I did this to my 7000 series scope but what i did was to use smaller LEDS that were the same size as the bulbs and since all the bulbs use the same supply voltage and only one is on at a time i severed the supply circuit trace and added the limiting resistor on the trace over the break. that way you just solder in the leds without the need for a resistor for each led. Nice project. I did this to my 7000 series scope but what i did was to use smaller LEDS that were the same size as the bulbs and since all the bulbs use the same supply voltage and only one is on at a time i severed the supply circuit trace and added the limiting resistor on the trace over the break. that way you just solder in the leds without the need for a resistor for each led.

]]> By: oleg http://www.circuitsathome.com/measurements/repairing-front-panel-buttons-of-tektronix-7904-oscilloscope/comment-page-1#comment-4181 oleg Wed, 17 Feb 2010 00:18:35 +0000 http://www.circuitsathome.com/?p=2705#comment-4181 Merle, The manual for 7904 is available at BAMA -> http://bama.edebris.com/manuals/tek/7904/ . You may also find manuals for some of your plugins there. If not, Artek Media sells scans for cheap, you can get a CD with almost everything from 7000 series for like $10. I am going to mod lights behind small acrylic buttons, like trigger source selectors. It seems that 3mm LED would fit there. I ordered a bunch of LEDs from eBay, will post results when done. Oleg. Merle,

The manual for 7904 is available at BAMA -> http://bama.edebris.com/manuals/tek/7904/ . You may also find manuals for some of your plugins there. If not, Artek Media sells scans for cheap, you can get a CD with almost everything from 7000 series for like $10.

I am going to mod lights behind small acrylic buttons, like trigger source selectors. It seems that 3mm LED would fit there. I ordered a bunch of LEDs from eBay, will post results when done.

Oleg.

]]> By: Merle Wagner http://www.circuitsathome.com/measurements/repairing-front-panel-buttons-of-tektronix-7904-oscilloscope/comment-page-1#comment-4179 Merle Wagner Tue, 16 Feb 2010 22:29:11 +0000 http://www.circuitsathome.com/?p=2705#comment-4179 Oleg, Thank you for the info on the 7904. I also have one and yesterday turned it back on for the first time in over 6 years (long story). It is in need of your repairs as well as taken to a shop for calibration/repair. Would you have a source for a manual/manuals for the unit? I have the 7904 with the following sub units: 7A26/7A24/7B85/7B92A I will definitely look into doing you mods once I get my hands on a manual. Merle Oleg, Thank you for the info on the 7904. I also have one and yesterday turned it back on for the first time in over 6 years (long story). It is in need of your repairs as well as taken to a shop for calibration/repair.
Would you have a source for a manual/manuals for the unit?
I have the 7904 with the following sub units:
7A26/7A24/7B85/7B92A
I will definitely look into doing you mods once I get my hands on a manual.
Merle

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