Hello everyone,
A little history:
I have been looking into purchasing a scope now for a while... not only could I use it for my audio ventures (making effects petals for my own personal amusement and education) but I am planning on repairing some of the things I have around my house (Old HAM rigs, possibly help calibrate a projection TV...etc.). Due to my lack of knowledge, I called upon a few friends for advise, and read many posts on forums. I found a great deal on a Tektronix 475A and with many blessings from quite a few around me, purchased it. It was an ebay purchase, with a fairly reputable person, the limited pics did show a few of the little flaws (some writing/a broken VAR knob, no biggy). The screen looked decent, the display a little fuzzy, but I figured that was probably someone not taking the time to adjust the focus knob.
Anywho, I got the scope today, via UPS (good old universal parcel stompers). The box was in good condition, fragile label and all (as well as my special delivery instructions on the box). The seller managed to pack the scope VERY well (which always seems to be a problem) and once i let it warm up to the air in my house, I turned it on, hoping to see a nice trace go across the screen.
It did turn on, but sadly not the fuzzy trace I saw in the ebay pics. so I checked out the ebay pics, set the scope up the way it was photographed, and still have the same picture. So I figure, that UPS knocked something loose in there (wouldn't be the first time they screwed something up for me) . So I crack the case on the scope (and I see the cause of the broken VAR control immediately (little coupler that I can purchase... glued back together for now), however, I see nothing obvious to see why the screen looks like the way it does (see pictures).
I will be honest. I do NOT know a lot about scopes, but I have no problem jumping in, as long as I am careful. I currently DO have the service manual for the scope, but it really didn't help me very much, as much of the language in there is not for someone of my limited electronics vocabulary. I probably will have someone else look at this with me, and I may be able to have it looked at professionally... but I am on a budget... I paid $150 for the scope, and I still gotta look around for some decent probes to use with it.
Sorry I can't really describe this better, but I figure a picture or two is worth a 1000 words
. From what I gather, the trace is going off the screen, and bouncing around in the CRT [horizontal deflection?]. Either way, I took a shot with the beam finder on, with the scope registering that there is a trigger, un-triggered, a shot of the little coupler and associated shaft/knob combo I mentioned, and basically how clean the boards are in this piece of equipment (looks like it was treated pretty well too!).
Any advice on to properly proceed, or where in the service manual I can look for adjustments, or if I should just get rid of it (I really don't want to... I like the look and it has probably more than I will use for the majority of my little projects, and from what I hear, these are pretty much one of the nicer analog scopes for their day, and... from what I have seen/felt... its built like a tank!)
Thanks again, and if you need any specific pictures with certain settings, let me know!
A little history:
I have been looking into purchasing a scope now for a while... not only could I use it for my audio ventures (making effects petals for my own personal amusement and education) but I am planning on repairing some of the things I have around my house (Old HAM rigs, possibly help calibrate a projection TV...etc.). Due to my lack of knowledge, I called upon a few friends for advise, and read many posts on forums. I found a great deal on a Tektronix 475A and with many blessings from quite a few around me, purchased it. It was an ebay purchase, with a fairly reputable person, the limited pics did show a few of the little flaws (some writing/a broken VAR knob, no biggy). The screen looked decent, the display a little fuzzy, but I figured that was probably someone not taking the time to adjust the focus knob.
Anywho, I got the scope today, via UPS (good old universal parcel stompers). The box was in good condition, fragile label and all (as well as my special delivery instructions on the box). The seller managed to pack the scope VERY well (which always seems to be a problem) and once i let it warm up to the air in my house, I turned it on, hoping to see a nice trace go across the screen.
It did turn on, but sadly not the fuzzy trace I saw in the ebay pics. so I checked out the ebay pics, set the scope up the way it was photographed, and still have the same picture. So I figure, that UPS knocked something loose in there (wouldn't be the first time they screwed something up for me) . So I crack the case on the scope (and I see the cause of the broken VAR control immediately (little coupler that I can purchase... glued back together for now), however, I see nothing obvious to see why the screen looks like the way it does (see pictures).
I will be honest. I do NOT know a lot about scopes, but I have no problem jumping in, as long as I am careful. I currently DO have the service manual for the scope, but it really didn't help me very much, as much of the language in there is not for someone of my limited electronics vocabulary. I probably will have someone else look at this with me, and I may be able to have it looked at professionally... but I am on a budget... I paid $150 for the scope, and I still gotta look around for some decent probes to use with it.
Sorry I can't really describe this better, but I figure a picture or two is worth a 1000 words
Any advice on to properly proceed, or where in the service manual I can look for adjustments, or if I should just get rid of it (I really don't want to... I like the look and it has probably more than I will use for the majority of my little projects, and from what I hear, these are pretty much one of the nicer analog scopes for their day, and... from what I have seen/felt... its built like a tank!)
Thanks again, and if you need any specific pictures with certain settings, let me know!