| Products > Test Equipment |
| Tektronix 2235 repair thread |
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| paronaram:
--- Quote from: bd139 on December 19, 2019, 08:07:08 am ---If it’s not sweeping on the left side only check the horizontal wires attached to the tube. Sometimes these fall off. Might be as simple as that. If not it’s going to require a lot more effort to find. --- End quote --- Thanks will check that later today |
| paronaram:
Yes, it does. |
| paronaram:
bd139 - you are correct. H cable is cut, but it's not just cut, it's cut from glass :palm: I honestly not sure, because I can't see there, clearance is about 1/2" Now I got another 2235, and I think tube is working but case is bent badly (what the heck are they doing with this equipment???) on the sides, and can not remove cover, over the weekend I will cut it with Dremel Is it allot involved in tube replacement? Any major calibration that I will need to do ? (aka buy another scope to calibrate this one :D) Thank you |
| bd139:
Oh that’s not good. See if you can feel around in the hole. Sometimes the connection is just bent. I’ve had that problem getting the case off a 2235 as well. Looking at the front it’s usually jammed on the right hand side next to the power supply section. When some inevitable idiot drops it, it bends the rails slightly. I had to hammer a metal ruler down the sized to get it off. Tube replacement isn’t terribly difficult. I think there’s instructions in the manual. It will need recalibration afterwards though. Make sure you work on top of a towel or something and wear safety glasses. There is an implosion risk. I haven’t imploded one yet accidentally but I have disposed of one on purpose and it’s quite loud and glad goes everywhere :) |
| paronaram:
Removed scope tube (very easy BTW), and guess what, pin is there, it's just cable was not connected. Looks like someone was trying to troubleshoot already. So I reconnected both cable from PCB to Horizontal pins, start the scope, and same issue... Well something should start working, cable was completely disconnected from that pin. On the internet I saw a video were guy was troubleshooting unrelated issue on the same Tek, and he was talking about pots on the top PCB (see picture), I move this pots around about 20 times, and turn the scope back On. See last two pictures ... very unstable but I see A and B now! But Horizontal sweep still not there When I press beam finder dot gets in the area when I don't see signal at all, so tube is capable to display something there |
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