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  1. T

    MCI JH-110 Project

    I could also use the manual velocity control to listen to a song without the pinch roller or even in reverse!
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    MCI JH-110 Project

    I found out what the blue "LD" button is for. It did indeed say in the manual, but not in the section that I expected. In the "Options" section of the manual, there is a more detailed explanation of the remote. The "LD" stands for lifter defeat. In any mode where the lifters would be activated...
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    MCI JH-110 Project

    That's the only thing I thought it could be. But the button is only on the remote and the manual says nothing about it at all.
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    MCI JH-110 Project

    A random thing that I have yet to ask. There is a blue button on the remote that is not there on the transport itself. I have no idea what it does. In fact it seems to do nothing at all! Does anyone know what the button is for? What does LD stand for???
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    MCI JH-110 Project

    Hopefully it will hold and the others will not fail in the same way! I think that the front panel may have been hit at some point. But plastic does become brittle over time, so who knows what will happen. I'll keep my fingers crossed though!
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    MCI JH-110 Project

    I fixed the switch! You can see in the picture below that the small plastic flange on the shaft of the switch has broken off rendering the spring useless to push the switch outward when the ready switch is depressed. I was originally thinking of epoxying a metal washer to the switch shaft...
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    MCI JH-110 Project

    Well I haven't done much on the 110 over the past few days. But I did clean her off a bit, just a wipe down of all the panels and such. The usual 30+ years of smoker dirt left on the rag once I was finished. I also did another record test just to be sure that I hadn't messed anything up. This...
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    MCI JH-110 Project

    The machine is all back together now and working. It seems my diagnosing skills are not as bad as I thought. I couldn't find a problem because apparently there was no problem... I just put it back together after finally getting some XLR connectors and it works just fine. Still gotta replace...
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    MCI JH-110 Project

    All diodes, caps, resistors, etc, tested fine. The problem has got to be on the mother board. I don't know what else to check.
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    MCI JH-110 Project

    Indeed. I'll hopefully get some XLR cables today to make testing easier. It just seems strange to me. The problem is on the mother board, yet there's very little to go wrong on it. Some diodes, caps, resistors, inductors and one transistor (the cue relay driver).
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    MCI JH-110 Project

    Well I've traced the problem to the mother board. But I have no idea what it would be. The audio seems to be working fine now, but still nothing from the meter. I have to get some XLR connectors before I can really figure this out. I can't keep poking around with clip leads anymore. It's...
  12. T

    MCI JH-110 Project

    Yesterday I replaced the IC sockets on the Bias boards as well as six electrolytic caps and one burned resistor. I also did a slight modification to the audio mother boards to allow me to use white LEDs for the meter lights since the 7387 bulbs are stupidly expensive from what I could find...
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    MCI JH-110 Project

    I happen to be a ham radio operator (not a very active one for the last four years or so) but if I ever need to call for help, I'm just gonna cue up that tape! :p
  14. T

    MCI JH-110 Project

    I didn't record that actually! That was before I tried recording! That is just what happened to be on the tape I bought online!! Right speed and right track layout. There was the Police and some old opera that was obviously recorded from a 78rpm record!
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    MCI JH-110 Project

    I guess I forgot to mention, it records too! I tested it yesterday! Sounds pretty good too considering I didn't adjust bias or anything.
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    MCI JH-110 Project

    Thanks, sr71rules! What I lack in knowledge I make up for in presentation and tidy solder joints! :D Here's the video I promised. It's just a short one, as you can see, but it shows that the machine is working. Now I have some caps and IC sockets to replace in the Audio drawer. Also, the...
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    MCI JH-110 Project

    I did a bit more work on the JH-110 today. I fixed some sloppy wiring on the transport and finally got around to the audio section. The good news, it works!!! At least, it plays fine. I didn't test the record. I'll need to get some XLR cables, since I've never owned any! :o I'd also like to...
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    Mystery Machine

    I am aware, thanks. That's what I get for rattling off a reply after four hours of sleep in the few spare minutes before work. :thumbs up: I have no desire to bother my uncle with questions I'm afraid. Even if the mixer turned out to be some desirable make or model, I would have to arrange a...
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    Mystery Machine

    I would have no real use for a 16 track mixing board, unless maybe I had a 16 track recorder. All it would do is take up space. And as far as not even finding out what it is to let you guys know, that's not my deal. Like I said, it was my uncle who told me about it and he's far to busy running...
  20. T

    MCI JH-110 Project

    I got even more done tonight by ripping myself off as far as sleep goes. I'll be lucky to get four hours before work tomorrow. Anyway, all DIP sockets in the transport have been replaced except four on the logic board that look quite new. I even replaced the two eight pin sockets on the mother...
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