#16
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In this picture the screen is filled all the way out, except the right edge and that seems to be because the Horizontal hold is off and flopped to the left.
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#17
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Complete newbie with these things. I am assuming that is the metal clamp wrapped around the glass. Should I take any safety precautions? I'm not sure what pushing back means: away from the screen or toward the screen.
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Denial - The Commodore VIC 20 Community. Last edited by Jeff-20; 11-18-2018 at 05:18 PM. |
#18
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For the yoke.......
Loosen the clamp. Push all the way forward against the "bell" of the CRT. Get a picture on & be sure its not tilted. If its tilted rotate yoke a little bit. Use a glove or just be careful of the wires. It wont kill you but you can get a surprise ! Slowly tighten clamp until you can JUST not move it. Done For tuner....... Pull tuner assy. Remove the tuner shield. It has catches on both sides & slides off. It is U shaped. You will see 4 or 5 wafers that the shaft go through. Spray a little contact cleaner or WD40 on the wafer part that moves. Spin channel knob about 4 rotations each way. Try it, should be clean now. Other stuff..... One pix shows hoz way off. Odds are the horz hold control is also dirty. Spray cleaner into the gap where the 3 wires / pins enter. Adjust back & forth a bunch then adjust to get a pix. enuf fer now. I need an ale 73 Zeno LFOD ! |
#19
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Quote:
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Denial - The Commodore VIC 20 Community. |
#20
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Could be the set was connected to an outdoor antenna during a lightning storm and the 1st RF amp transistor got blasted.
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Audiokarma |
#21
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Making progress... Got the yoke twisted back in place per zeno's instructions (Thank you!). But not yet brave enough to take the tuner apart. All of the wires are soldered.
I took some pictures of the inside and discovered one of the corners that anchored the screen in place was completely broken! It must have gotten pushed in during shipping. I took pics of one of the normal corners and the broken one after some efforts to put in back in place. Would this kind of damage seem connected to the small image?
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Denial - The Commodore VIC 20 Community. |
#22
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The damage to the CRT anchoring point has nothing to do with the image size issue. |
#23
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Cabinet damage means the set took a good lickin. Thats why I said
to give the main PCB a look for cracks. Especially at the mounting lugs & the flyback. 73 Zeno LFOD ! |
#24
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Quote:
First step on any noisy tuner issue should always be clean the contacts. You should not need to remove the whole tuner from the cabinet or any wires from the tuner. Most sets made it so that you could unclip and remove the tuner shield and clean the contacts with the tuner still mounted and connected. There is a front and back to the tuner that the shaft passes through and a "top" that the wires connect to(some tuners are mounted upside down or other wacky ways so "top" is not always pointing up)...The removable shield typically comprises the bottom and sides of the tuner. It usually clips into the top. To remove pinch the sides inwards near their centers at their upper edge where they meet the "top" and pull down after you've started to pinch while still pinching...The shield should slide off. After that identify the contacts and start spraying cleaner and spinning the knob...If there is lots of room around the contacts I like to stick a soft white pencil eraser in there and let the contacts brush against it...This alone will help but if you do it while they are wet with contact cleaner you will be impressed with how much tarnish it will remove.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#25
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Quote:
It may be true that his tuner is dirty, but it wasn't I who initially suggested that the RF amplifier transistor may be blown. |
Audiokarma |
#26
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Quote:
If what I see as bad advice is given I will attempt to correct it (or improve the advice given) no matter who gives it, starts it, or contributes to it...If you happen to be caught up in the giving of bad advice that is not my fault. And you have no right to tell me where and how I can put my two cents in on an issue as long as I am abiding by the rules of VK. I will try to sound more respectful going forward...But bear in mind we ALL get correct by other VK'ers from time to time, and unless someone explicitly calls you a big dummy that is likely NOT even a tiny part of their goal in offering what they see as the correct information to those reading.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#27
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If it was a dirty tuner, usually you can wiggle the shaft and they snow will come and go. Since it obviously took a spill I'd look for a broken resistor, wire or other component, (on top of the tuner or elsewhere).
You should have determined the location of the point of impact. Is that close to the tuner? Did you check voltages at the tuner? Might even be an IF problem.
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#28
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...
Last edited by andy; 11-18-2021 at 04:50 PM. |
#29
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Have you tried to hook it up to a DVD or VCR?
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#30
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Yes. The last image I provided (of a football game) is from a digital converter box capable of playing video off a hard drive. Like the Atari, the image is just small.
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Denial - The Commodore VIC 20 Community. |
Audiokarma |
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