Re: HEATH 4552 OSCOPE WITH ONLY ONE CHANNEL WORKING, looking for the schematic

Found it:
[url]https://drive.google.com/file/d/0B8Kvsw95jCqITG9XcDc0QnAwbHM/view[/url]

Relabelled Heath from the manufacturer Pintek (model PS-251)

Operating manual:


Pintek specs can be found here:
[url]http://www.pintek.com.tw/[/url]

The most important find is this video (where I got most of the details I have listed) of the exact model being calibrated step by step. w2aew rules the oscilloscope world!
[url]https://www.yout...

I have an old 25mhz Heath 4552 oscilloscope that I want to get running properly so I can sell it. Everything appears to be working except Channel A. When I select that input the trace never shows up. It seems as if the vertical position is slammed off the screen since there is a slight glow that can be seen if the room is dark.

I have several other 100mhz scopes and I plan on using one of them to isolate this problem. It would make this a great deal easier if I had the schematic. I noticed some time ago someone had a power supply issue with the same model oscilloscope and a member...

Re: New Members - please post your introductions here

Hi all,
Tank Circuit here.
I've been working with electronics from the mid 70's. Started with the Navy, I was trained to maintain their radar and computer equipment to direct the weapons to hit the targets. Then I was in the "home-electronics" field for over 3 decades. Worked for Fluke in their manufacturing plant and now at Microsoft assisting in developing new products.
I have come across this forum many times during my searches as I develop may many projects, and I always chuckle at the name...