A Common failure on 4xx scopes are the solder joints inside
the input attenuators. They are white plastic rectangular things with 100X, 10X,
etc marked on them.? They have component numbers between C30 and C37
between the two channels. The forum message archive has lots of discussion about
fixing them, and it just gets down to a solder problem where the 6(?) pins come
up and join the PCB inside the attenuators.
It's a simple fix if that is your problem, and in my
experience cleaning the area to be re-soldered is the most critical thing as
there is some kind of (silicone?) grease in there that needs to be kept away
from the soldering touch up work.
tom jobe...
PS the little covers come off of the attenuators easily, look
closely at how they attach. The attenuators just unplug from the vertical
preamp.
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----- Original Message -----
Sent: Tuesday, March 19, 2013 6:23
PM
Subject: [TekScopes] 475 channel 1
intermittent
?
My 475 channel 1 is pretty much dead it comes on intermittently mostly
dead. channel 2 works perfectly. I had this problem since I got it but It was
originally mostly working and has just gotten to the point it is unusable. I
don't have a second scope so I will have to deal with only probing with the
multimeter but I am unsure of where to start. Is my issue in the channel 1
vertical pre-amp or in a trigger? I've checked the power supply that is all
working fine.
