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Thread: Who has a CTI 678xx driver board?

  1. #1
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    Default Who has a CTI 678xx driver board?

    Does anybody have a CTI 678xx and can take a picture of or get info off the board? I'm specifically looking for a closeup of the resistors/caps right next to the 3886 so I can identify resistor R33 (displayed as problem 1 below). If you can read the value, that works too! I'm guessing "203" aka 20K, but I want to be sure before I replace it!



    Less importantly, I'm also curious what other people have for the values of resistors off the AGC, displayed above as problem 2...

  2. #2
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    I will have a look Yadda and take a photo, but I can't do it til Friday earliest.

    Is that OK ?

    Fluff
    The light at the end of the tunnel. Its' a white laser.
    www.rocknite.co.uk

  3. #3
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    That'd be just fine, this is on my list of "projects to do"

  4. #4
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    I have one of those lists too ! I think mine's broken ! Every time I look at it , it swells !!

    You should see the pile of laser bits I have with a project in mind. But... I have to earn a living too.

    Fluff
    The light at the end of the tunnel. Its' a white laser.
    www.rocknite.co.uk

  5. #5
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    On one of my 678xx drivers which is configured for a 6800HP:

    R33 is labeled 1503
    R52, R51 and R19 are all labeled 1000 and I see 3K across the 3 in series

    I also noticed that the one of my DT-40Pro drivers is nearly identical to the 678xx driver

  6. #6
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    Thanks Junk! Now to hunt down a 15k resistor...

    Fluff, can you measure those 3 resistors on the bottom on Friday
    if you get a chance? I'm looking for some empirical data...

    You guys are great!

  7. #7
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    I think 1503 is 150K. I measured around 70K, but the reading is slowly increasing, possibly because there is a capacitor across the resistor.

  8. #8
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    150k? That makes sense where it is, that'd be a gain of ~11...

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