Hey people check this out:
http://cgi.ebay.com/LEADER-325A-OSCILLOSCOPE-60MHz_W0QQitemZ310138181926QQcmdZViewItemQQptZBI_Oscilloscopes?hash=item4835ad1926&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A13%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50
the trace is totally out of whack! 😀
I wonder what the heck happenned... could have something to do with the fact it was dropped.
http://cgi.ebay.com/LEADER-325A-OSCILLOSCOPE-60MHz_W0QQitemZ310138181926QQcmdZViewItemQQptZBI_Oscilloscopes?hash=item4835ad1926&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A13%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50
the trace is totally out of whack! 😀
I wonder what the heck happenned... could have something to do with the fact it was dropped.
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gain-wire said:
yikes... CRT yoke assy most probably fubar-ed. Seller doesn't say exactly was dropped but is implied with rubber foot damaged that badly.
An oscilloscope has a Yoke? hunh? 😕 I thought only televisions and computer monitors had yokes...
gain-wire said:
Some do an some don't, anyways the deflection looks wonk'd.
The shorter neck CRTs usually have coils, anyways here the service manual ftp://bama.sbc.edu/downloads/leader/lbo324/ your guesses as good as mine.
If it doesn;t have a yoke, certainly the deflection plates inside the CRT could be bent out of alignment by dropping.
And make sure the power supply filter caps haven't come loose.
And make sure the power supply filter caps haven't come loose.
its eletro-static deflection.
almost certainly a broken support inside the tube - this can usually be seen with just the timebase running and altering the vertical position.
you may even be able to hear the bits rattling around inside the tube ...
almost certainly a broken support inside the tube - this can usually be seen with just the timebase running and altering the vertical position.
you may even be able to hear the bits rattling around inside the tube ...
Yeah, I did check the service manual, and there is no yoke coil. Just deflection plates. I suppose the tube is a fairly common one, for a japanese product it's a 95TB31. Funny, it does not appear to be mentionned in the parts list.
Anyway, could there be a possibility thet it could be the "trace rotation" coil? I thought this was usually done by simply rotating the crt.
Anyway, could there be a possibility thet it could be the "trace rotation" coil? I thought this was usually done by simply rotating the crt.
Most likely a power supply problem. Check with the aid of yet another scope for AC leakage on the DC rails, be careful! Bent deflection plates wold not cause this sort of odd trace but AC leaking through would.
MArk
MArk
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