need some help fixing an old oscilloscope
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Re: oscilloscope repair HELP
Welcome, mitchell2120!
What make and model is it?
Also, what is the problem you experiencing with it?My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics. -
Re: oscilloscope repair HELP
bk precision model 1431 solid state-triggered sweep
powers on no traceComment
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Re: oscilloscope repair HELP
Check the simple stuff first is the main fuse blown?
Are the heaters at the rear of the tube glowing a faint orange? Do you have high voltage at the anode?Last edited by Krankshaft; 03-05-2011, 11:52 AM.Elements of the past and the future combining to make something not quite as good as either.Comment
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Re: oscilloscope repair HELP
M,
It may not be broken.
Look for the trace trigger and sweep controls.
Set them for a slow trace such as .1 second / CM
Set the 'trigger' pots to center
Set the sweep controls for auto or free run
Now turn the display brightness up to full.
Can you see a bright spot either high or low moving across the screen?
Set the vert position so that the trace is centered.
If the above 'fixes it' be sure to turn the brightness down.
Report back.
Jack Crow"You are, what you do, when it counts"
The Masso
"Gravity, the quickest way down"
Mayor John Almafi
"You ever drop an egg, and on the floor you see it break?
You go and get a mop so you can clean up your mistake.
But did you ever stop to ponder why we know it's true?
If you drop a broken egg you will not get an egg that's new?"
MC HawkingComment
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Re: oscilloscope repair HELP
heaters at the rear of the tube glowing a faint orange, high voltage at the anode no sure dont see it . i know this model does no have a wire to the front of the crt .Comment
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Re: oscilloscope repair HELP
looks like thisAttached FilesComment
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Re: oscilloscope repair HELP
can get a hint of trace when i turn it offComment
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Hello.
I have jut got my first analogue oscilloscope. An Isotech 620 20MHz.
I want to learn how not to damage it, and I found instructions on the internet obscure.
They talk about ground, earth, floating ground, this, that....
But they don't actually say anything anything useful so far.
I want to know:
Don't connect exactly this to exactly there or it blows up.
For example, I am tracing a signal from a function generator in an audio amp, or testing for voltages in different parts of a circuit.
I want to know what not to connect... -
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All,
Some of you have helped me in the past and I am very appreciative of all the help! (I have fixed TVs/Stereos/ and other small appliances with your efforts...Thanks so much!!!
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Hi, i have a Lenovo S145 that after 20 seconds shutdown and restart (it's working correctly on thse 20 seconds)
everything seems ok, but on Vcore inductor ( this is an i3 with just 1 switching power supply for CPU)
there is an output to teh CPU with a spike.. seems that inductor can't handle the input...
replaced the capacitor (330) and the inductor (R15) without any change
any idea? very thank you!
input of the inductor seems as usual... only strange thing is that the upper/lower voltages seems to be 21V (main power line is 19.3) ... but not sure this...
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