HP Oscilloscope Died

[Mark-VA]

_{Well it doesn't look like I won't be doing any more measuring. Blasted scope refuses to scan.
But it's old and needs to be trashed.}

[homefire]

???? Fix it. Dang you must have more money then I do.

[Mark-VA]

I gave it some thought until I noticed it was manufactured in 1974. I guess I'll trash it.

[kt315]

look. he moded and uses lamp oscope. https://www.youtube.com/watch?v=JtOBPgPI3Fg

[Mark-VA]

Well that settles it, I don't have the knowledge for that. I'm an electronics want to be. Been tinkering for 20 years and can say for sure I'm 100% a novice.
But that doesn't keep me from studying, reading and playing. I took the electronics course through the NRI which has since closed their doors. But boy what I learned.

[Gwil]

On the other hand, think how much you could learn trying to fix it. Try googling the model and fault. Other people may have had a similar problem.

[Mark-VA]

Thanks I might try that. Amazing what can be found googling.

[rickb]

What is the model # of the scope? If both of us have the manual of the scope this might be doable. I have many years of repair/cal experience on older HP and Tek scopes. Old analog scopes are pretty straight forward and unlike newer scopes are actually repairable.

Rick

[Mark-VA]

1220A

[homefire]

EVERYTHING one could ask for to revive that thing is at hand, man. Take advantage of it. Hell I wish I had a scope of that caliber. What is the model number ? Dhooooe , Here ya go ! EVERY THING you could ask for ! http://tinyurl.com/7slcrrz

[Mark-VA]

Thanks homefire.
After careful study I don't think the scope will allow me to measure the different metal detector frequencies.
Maybe the waveform but not the actual frequency.

[homefire]

??? LOL, Frequency can be determined by measuring the Time Period of one cycle. Just determine the time for one wave length full cycle and divide one second by that time. That will produce Hz. Sheeeees. Study the basic Use of a O Scope. https://www.youtube.com/watch?v=kCQ6M0fmWG4

[rickb]

That pdf is for the 1222 not the 1220A. The manuals I found were either very incomplete or mostly unreadable (very poor copy).
An analog scope is meant for viewing wave forms, time and phase differences.
For the time being you should hang on to the scope.
Are you sure the scope time base is being triggered? No trigger (internal or ext.) with the brightness turned up can produce what you see.

The operating instructions part of this manual are just clear enough to be useful. The schematics and parts layout are mostly illegible.

http://bee.mif.pg.gda.pl/ciasteczkow...r/HP/1220A.pdf

[Mark-VA]

The most I get from the scope is a single glowing dot in the middle of the screen. I've adjusted every possible setting in the original manual. I can adjust the focus and move the dot around using the horizontal and vertical adjustments, but the solid line across the screen will not come up. I've used both inputs and applied a signal to each, but the dot never changes.
Since the scope doesn't have the capability to measure coil frequencies (with ID's) repairing the unit wouldn't contribute to my detecting interest, I'll probably trash the unit or give it away.

[nonkapo]

I gave it some thought until I noticed it was manufactured in 1974. I guess I'll trash it.

So what should i do when my one is manufactured 1971??? At that time factories make lasting items,not like now. Try to fix it.