Don m wrote in message
roups.com...
Probe 1 doesnt respond to any input..., ch 2 seems ok.
BNC connector was loose and wire to resistor broke loose
+Wire from resistor to BNC connector was re soldered nut tightened
to BNC, and was working fine. Repair still looks good but
ch 1 trace just a flat line can only adjust location of flat line.
afraid to adjust internal pots in fear that I am making things worse.
Channel 2 is working good responds to testing and calibration
and internal pot adjustments. more in depth repair? or More aggressive
adjusting? any thoughts?

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Blown first transistor or corrossion in one of the attenuator switch
actions, no pot twiddling will resolve it.
Can you swap a screened lead somewhere inside ? like checking left and right
amps of a stereo unit