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Re: Help! Tek 2235 Signal on Ch1 appears on Ch2


 

Mark,
If you don't already have the service manual, get it from KO4BB.com:

<<>>

I would assume the problem has something to do with channel switching, which is shown on the "Vertical Preamap & Output Ampl" diagram. The "foldouts lg" pdf seems to have the best scan of that circuit.
Try exercising the various vertical mode switches to make sure it isn't just dirty contacts. See if the various combinations of "CH1 BOTH CH2" and "ADD ALT CHOP" make sense in some positons and not in others--that my give you some clues.

--John Gord

--- In TekScopes@..., "Mark" <mjurras@...> wrote:

My Tek 2235 has a problem, The input signal on Ch1 also is displayed by Ch2. This occurs whenever CH2 is displayed (Both or CH2 only) . It occurs even if Ch2 input is set to DC, GND or AC. When I adjust the vertical position of CH1, Ch2 moves. If I put the input on Ch2, Ch1 is not affected.

Can anyone help me troubleshoot this?

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