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New member- Oscilloscope calibration help

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JjSwee

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I just purchased a oscilloscope from ebay not too long ago. I recieved a Philips PM 3055. I turned it on and the lines were not level or centered. I used the trace rotation knob to asjust the level, so it is flat now. The problem I have is the line wont center. I adjust the x-axis as far as it will go, and it doesnt come close to reaching the center (I will take a picture). I was wondering if any of you know how to fix this. My friend told me it was a potentiometer inside, so I opened it up and there are lots of pots on the top board. If anyone can guide me to fixing the screen, I would greatly appreciate it.

Thanks for your help.

Link to pictures:

Picture with X-POS adjust centered:
http://img291.echo.cx/img291/9486/p1010087large8ku.jpg

Picture with X-POS maxed to right side: (Note the green dot at the right side of the line)
http://img240.echo.cx/img240/2946/p1010090large2mi.jpg

Innerds:
http://img240.echo.cx/img240/2931/p1010091large0wh.jpg
http://img240.echo.cx/img240/9717/p1010092large1oi.jpg
 

Have you checked the coils on the neck, they might be out of alignment after shipping (bumpy ride).

Ante
 

Pardon my inexperience, but how to I do that?
 

Oh my. The seller said he didn't know if it worked or not. That usually means it's broken. :(

The horizontal is a long way off. I'll bet it's an electrical malfunction. If you are lucky, it's just a loose connection or maybe an intermittent scratchy trimpot.

I would try gently wiggling and tapping things with an insulated stick, in hopes of finding a loose connection. If no luck, find yourself a service manual and start troubleshooting. Don't be surprised if a used manual costs more than you paid for the scope. Maybe you can borrow another scope to help troubleshoot this scope.
 

I believe something is defective.
Try contacting this guy: **broken link removed**
 

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