Ed,
Be careful with those knobs. The switching (partly physical contacts and partly an optical encoder) is contained entirely inside the knobs themselves. Disassembly is not recommended unless they have a specific problem, although I did it successfully to relubricate them.
Follow the manual procedure for removing the front panel as a unit (not so obvious, but not too difficult). The knobs are attached by screws installed from the rear of the front panel. They have pins that plug into the front panel circuit board. I did this some time ago, so I would need a close look at my unit and the manual to give you more detail.
Regards, Cliff Carrie
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From:
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[email protected]> on behalf of Ed Breya via Groups.Io <edbreya@...>
Sent: Friday, April 19, 2019 2:10 PM
To:
[email protected]Subject: [TekScopes] 7L5 knob removal
I just picked up a severely mechanically damaged 7L5, and trying to rebuild it. I started taking apart the front panel, removing the knobs as usual. The frequency span/resolution and time/div knobs have no setscrews, and appear attached somehow from inside and behind the front panel. I peeled off the black knob face covers too, hoping to find some attachment hardware, but they're blank underneath. Does anyone know the trick to removing these knobs? I R'dTFM but didn't find any explanation, and it's not clear at all from the mechanical diagrams.
Ed
