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  1. Replies
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    Well, YEAH^^^^ I must read too many threads, I...

    Well, YEAH^^^^

    I must read too many threads, I never connected this thread with the loose wires thread elsewhere. If TP16 has no voltage, then yes, we go back a step and check for AC before the...
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    Q2 is saturated, note the base is half a volt...

    Q2 is saturated, note the base is half a volt more negative than the emitter, turning it on. In any case, it has teh +55 on the collector to power the circuit, which is its job. That Q1,2 circuit...
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    Perhaps I wrote poorly. TP16 is on the main...

    Perhaps I wrote poorly. TP16 is on the main board. It serves pin 4 of J10 there through that 10 ohm resistor. Do you see J10 on the drawing? TP16 is very near.

    To check +5 on the DSP, just...
  4. Thread: What is this cap?

    by Enzo
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    Do you still have the old transformer? If so,...

    Do you still have the old transformer? If so, cut it open and see if your open primary isn't really just an open thermal fuse inside the thing.

    In any case, your cap was wired right across the...
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    it is working and everything is fine? Then...

    it is working and everything is fine?

    Then stop fixing it.
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    I can, a shorted filter cap. (yes, I note you...

    I can, a shorted filter cap. (yes, I note you essentially said that a line or two later) Hell a shorted cap anywhere. And by "shorted" I include very leaky caps. if a coupling cap between stages is...
  7. I maintain that if my soft brass brush takes...

    I maintain that if my soft brass brush takes plating off a jack, that plating was already loose.
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    Each board has its own jack numbers. So look on...

    Each board has its own jack numbers. So look on amp drawing page 1. Bottom center see J10. That is J10 (Jack 10) on the amp board. It is the main connector to the DSP. They even made it plain as...
  9. I ran a pro shop for decades. I think your...

    I ran a pro shop for decades. I think your product is not really aimed at me, I think you are aiming more at the end user, like musicians. I have an arsenal at my elbow, soft brass brushes, the...
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    Hi don. About my earlier remark, I think you...

    Hi don. About my earlier remark, I think you might have looked too deeply at it. I was only chiding you for saying you got "no resistance" between two points, and I said I think you mean infinite...
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    SOlder shows up in many places. Often hardware...

    SOlder shows up in many places. Often hardware stores have some - being careful to get electrical solder, not plumbing solder. Hobby/craft stores sometimes have it as well. And I bet a lot of...
  12. Good luck. It does directly address an actual...

    Good luck. It does directly address an actual need.

    I think it is cute the web site template was followed. TOP SELLER, FAN FAVORITE, NEW. all are the same thing.

    I use a Qtip myself.
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    peavey does, contact customer service at Peavey. ...

    peavey does, contact customer service at Peavey. I know of two versions, the '78 and the '81. They are VERY similar. Just ask for both.

    Howard likely solved his problem, but didn't come back to...
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    R78,79 both do identical jobs and should be...

    R78,79 both do identical jobs and should be identical hot. They normally get pretty warm. If no current if flowing through them they stay cold - room temperature. If the 17v end of one is shorted...
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    That transformer is used in more than one...

    That transformer is used in more than one product, but not all its functions are used in all models.
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    If the one diode is bad, please go ahead and...

    If the one diode is bad, please go ahead and replace both of them.
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    If C16 is leaking then a drop would appear across...

    If C16 is leaking then a drop would appear across R34. Is it?

    Or Q6 is defective.
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    The loose wires - the wires ending in the molex...

    The loose wires - the wires ending in the molex connector - SHOULD all measure open to ground. Otherwise it would mean a short to frame. SO if you measured 326 OHMS (was that it? always include...
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    J26,27,28 are blank pins. They do not connect to...

    J26,27,28 are blank pins. They do not connect to anything else, nor to one another. They are there to park unused transformer wires.
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    PNP. Base sits 10v more positive than emitter. ...

    PNP. Base sits 10v more positive than emitter. Reverse biased then.
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    359

    The bases should be similar, yes, but we have the...

    The bases should be similar, yes, but we have the 30v offset on the output sampled into Q6. Q6 normally tries to correct such differences.
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    You know what? SHow the customer the pictures of...

    You know what? SHow the customer the pictures of the damage you had to repair. Especially if you can show him a different ribbon termination that wasn't damaged. Tell him how you managed to save...
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    I don't know what this means. The cathode of...

    I don't know what this means. The cathode of D14 is also connected to the + end of C40? The cathode end of D14 should be grounded, which is the NEGATIVE end of C40. And of course the positive...
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    And what they are used to. I had a guy try his...

    And what they are used to. I had a guy try his first digital meter, and gave up and went back to analog meter. Why? The reading was always changing. it didn't matter to him when I pointed out the...
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    Sure, use a fingertip. ANy of them getting hot?

    Sure, use a fingertip. ANy of them getting hot?
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    C40 is in parallel with D13. By measuring across...

    C40 is in parallel with D13. By measuring across D13, you are also measuring across C40. Look at the schematic.

    Any chance D13 is in backwards? The cathode - the lined end - is the end NOT...
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    I think it cute the TP calls it 17v, but the...

    I think it cute the TP calls it 17v, but the schematic calls it 16v. I generally refer to these as 15v rails anyway. Point is your +15/16/17v is missing. Until that is restored, nothing that uses...
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    It is a switch, it turns on Q2 to bring +55v into...

    It is a switch, it turns on Q2 to bring +55v into the circuit to enable it. It is a power up mute circuit. There is +55v on the collector of Q2, so that whole circuit is working.
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