Oscilloscope Channel 1 problem on BK Precision model 2120 - diyAudio
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Old 16th October 2007, 06:44 PM   #1
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Default Oscilloscope Channel 1 problem on BK Precision model 2120

This 2nd handed oscilloscope's channel 2 is in function but the channel 1 found no reaction to signal input.
The channel 1 can shows the beam line and can be positioned up and down.
Is there any link I can download the services manual or schematic?
Or could anyone give me some guidance to repair the fault channel.
Thanks very much in advance.
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Old 20th October 2007, 10:21 PM   #2
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most common problem with scope inputs is either an open resistor in the attenuator switch, or a blown diffamp transistor. the input amp of an o-scope is very much like in an audio amp, a diff pair with a current source. the diff amp feeds symmetrical VAS stages all the way to the deflection plates. between the input and diff amp, you have a stepped attenuator. if your trace can't be centered on the screen, suspect the amp section. if you can center the trace, suspect the attenuator.
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