Hey all,
I have a Beckman-Industrial 20Mhz scope (not sure of model number) that I need to repair. I don't have the owners/service manual for it anymore nor do I have another scope that would aid me in fixing it. There is something wrong with the second channel amplifier as it is picking up noise regardless of if there's a probe connected to it or not.
I'm wondering if anyone out there can recommend a good palce to send this thing for repair.
You could try here. But first go to Google / images and visually try and find the model number.
When indside you should , with luck, be faced with 2 identical compenentwise, not topologically necessarily, both the same, then compare node for node with a signal bridged between both inputs.
At 20M you may be lucky and not have to remove loads of screening , could easily be just corrosion on an attenuator switch.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
r.
It's a Circuitmate 9020.
I've taken it apart once before but...I think I need a second scope to be able to determine where the noise is...I considered trying to use the scope's good channel to diagnose the second channel, but I doubt that'll work.
There's no corrosion inside the machine...it's pretty clean. flipping any of the switches doesn't make the problem go away...and it's not anything loose as I poked around with the thing on. But, both amps are pretty much the exact same thing...mirrors of each other basically. Like I said, previous attempts to fix it have failed and I'm at the point I should let a pro handle it.
Why can't you trouble shoot the defective channel using the good channel?
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