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Hello all, long time reader, first time poster on the forums. I recently picked up a junk Coleco Telstar Combat system made in ‘77 for a couple dollars. It was pretty roached, but it’s a rather obscure system so I couldn’t pass it up. However, after getting it all cleaned up, I plugged it to my TV to test it out, but all I got was static and no signal. I tried many times turning the system off and on but mostly no signal would appear at all. Sometime a staticky signal would fade in and out, but it was very inconsistent. Once, I even got a vague image of the actually game screen to appear for a few seconds. I’m fairly confident that the video cable coming from the system itself is not the issue and I have it hooked up to a known working RF switch that works well with my Atari 2600. So, I opened the system back up, removed the RF shield, and began to adjust the RF inductors (I’m using a modern tv). ( I attached pics for reference) There appears to be 2 RF inductor adjustments under the shield, and a screw adjustment at the top right corner of the board. I started adjusting the orange (bottom) inductor but that only caused the video to go from no signal, to staticky image, back to no signal. So I tried to adjust the white (top) RF inductor, but it wouldn’t budge. Upon further inspection, I saw the slot inside this inductor had several cracks. I desoldered the inductor from the board to examine it further, but couldn’t get it to budge. After resoldering it back on, I still have the same issue, however, the static signal seems to become more and more scarce, leaving me with no signal as I fiddle more and more with the inductors. I also tried adjusting the screw adjuster to no avail, but I’m not really sure which RF adjusters I should/need to adjust. Would the cracking in the inductor be enough to inhibit the video signal completely? Is there anything else that could be causing this issue besides the inductors? I have a rather limited knowledge on electronics as I have only been attempting retro repairs for about a year and a half, so any new nuggets of knowledge are greatly appreciated! This is a really neat and rare system that I would like to have working in my collection. Feel free to ask questions if something isn’t clear. Thanks in advance! (Note: I have the same problem regardless if I’m using batteries or the power supply).
I have been fortunate to get my hands on a Coleco Telstar Arcade Model 6071 (the triangular one). The RF modulator has deteriorated and I need to convert this system to composite video. This is where I need help. It looks like it would be pretty simple to do, but I'm a newbie and I don't completely understand the chips and pins and I don't want to risk destroying the console by experimenting. I'm attaching some pics for reference. There is a single coax cable connecting the board to the RF converter. I would assume that this cable is carrying all of the video information. Can I just take this signal and convert to composite? Does anyone have instructions or pictures that are specific to the Model 6071? I would greatly appreciate any assistance anyone could provide.
If not, what are the specs for it? I have a complete in box Telstar Ranger, sans the AC adapter, which I think may not have come with it. I don't want to buy C-Cells.
I'm trying to get samples of all the different ICs inside 1st generation consoles. Working systems are fine, but I'd rather scrap a junk system than junk a good one. You can keep the shell, all I need is the chips and pics of the PCB. If you have a system you're willing to send, tell what it is so we can figure out what chip it has in it.