After a few months in storage, my beloved Tek 2235 scope now only shows a quick burst of a trace, or spot of light, on power up and then the screen goes blank.
Without asking for too much detail, is this something worth having a look at to fix, and, if so, what is the most likely fault?
Can I assume the tube is still good?
Thank you kindly for any advice.
James S.
It's extremely unlikely that the tube is the problem.
James Seamore wrote in news: snipped-for-privacy@4ax.com:
Is the power supply making any noises,like a "chirp" or clicking?
Yes,it's worth fixing.
1st;check power supply voltages and ripple.(especially the 2kv cathode V.) Bad electrolytics are a common problem here,ESR climbs. Then determine if the trace is off-screen,either vertically or horizontally;could have a bad metal film resistor in the vertical amp or horizontal amp(or a lead fell off a pin!).You can short the CRT vertical pins(blue/brown wires) together to see if the trace reappears,same for the horizontal pins.(red/green wires)It sounds OK.
One important thing is to get a service manual for that model,it has schematics,parts lists,a NICE circuit description to tell you how it works. You may be able to download a copy from the BAMA website.
Jim Yanik schrieb:
I definetely agree.
for the power supply schematic: pwr supplies of Tektronix scopes
2215/2215A and 2235 are very similar, so one of the BAMA docs should be helpful.hth, Andreas
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