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Thread: Marshall TSL-100/122 Amp Head Interconnect Cables List attached

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    Supporting Member nevetslab's Avatar
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    Marshall TSL-100/122 Amp Head Interconnect Cables List attached

    I have a client's Marshall TLS-100 Amp Head in with crackling. Initial findings were not even getting output signal, or just barely....only leakage, so I was well past looking for the mentioned Crackling. I pulled up my schematics for the amp, and, to make life wonderful, the schematics don't show what connects to what from each of the schematic pages.....apart from the Reverb schematic TL-10-63-02.

    So, not even sure if all the grey and blue cables were all properly connected (assuming they were), I stopped to compile a list of all the connections labeled CON xx. And, just for sake of completeness, listed each board's CON numbers followed by their destination. I just got thru verifying each board's list, fixing the few mistakes I had made.

    And, having just removed a little sliver of tissue found in the input jack, I now have signal flowing thru all three of the preamp channels, so I'd guess the list is accurate. I'll await conformation on that.

    TSL-100 Amp Head Interconnect Cables List .pdf
    Marshall_jcm2000_tsl100_100w.pdf

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    Last edited by nevetslab; 10-30-2019 at 06:34 PM. Reason: Added TSL 100 Schematics
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    Lifetime Member Enzo's Avatar
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    Experienced pro that I am, I had to learn the hard way about the MUTE switch on some MArshall panels...

    I think I recently posted this, but here is my version of teh TSL connection list
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Great!
    I always label them and pretty much know where they go from reputation, but this will make it easier when I eventually forget.

    Got one on the bench now with a few problems.

    Trying to determine if the board is conducting

    It has the correct bias feeds, but is a light green board.
    I need the check the serial number.

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    Quote Originally Posted by Enzo View Post
    Experienced pro that I am, I had to learn the hard way about the MUTE switch on some MArshall panels...

    I think I recently posted this, but here is my version of teh TSL connection list
    Enzo, mind elaborating? Is this an actual mute circuit problem or operator problem? I have a TSL 100 with *very* low output, but I took one look at the mess of cables and connectors and put it to the back burner.

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    Lifetime Member Enzo's Avatar
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    Some models have a mute button on the front panel. Push it in and the amp is muted - silent. I was saying I have had an amp on the bench and had pushed the button in by accident, and spent way too much time trying to "fix" it. Then I noticed the mute was pushed in. Pushed it back OFF and amp was fine. Duh. I won't do that again.

    On your TSL100, look at the two buttons right next to the power switches. First one says OUTPUT MUTE

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    Quote Originally Posted by Enzo View Post
    Some models have a mute button on the front panel. Push it in and the amp is muted - silent. I was saying I have had an amp on the bench and had pushed the button in by accident, and spent way too much time trying to "fix" it. Then I noticed the mute was pushed in. Pushed it back OFF and amp was fine. Duh. I won't do that again.

    On your TSL100, look at the two buttons right next to the power switches. First one says OUTPUT MUTE
    Yeah, that one didn't change anything when I tried it. I was hoping there was some known issue with the mute circuitry.

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    Supporting Member nevetslab's Avatar
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    Quote Originally Posted by Enzo View Post
    Experienced pro that I am, I had to learn the hard way about the MUTE switch on some MArshall panels...

    I think I recently posted this, but here is my version of teh TSL connection list
    I must have missed it when you posted this. THAT's the way to put sense into all of these Marshall amps with the cajillion jumper cables! Excellent drawing!

    Any chance you also have one for the JCM 2000? I haven't tackled that one yet, and have just been going off a drawing that often gets misplaced having the mating connection details.

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    Last edited by nevetslab; 10-30-2019 at 06:42 PM.
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    Lifetime Member Enzo's Avatar
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    I only relatively recently found the chart I posted above, for a long time I had the listing you posted.


    As to JCM2000, no I don't, and I have to point out JCM2000 is a series, not a model.

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    Stray Cap DrGonz78's Avatar
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    Quote Originally Posted by nevetslab View Post
    Any chance you also have one for the JCM 2000? I haven't tackled that one yet, and have just been going off a drawing that often gets misplaced having the mating connection details.
    Did you mean JCM2000 DSL 100 or something?

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    Anyone ever notice the clean channel on the TSL100 hums more than the other two channels?

    Every one I've seen is like that.

    So far bias is holding steady on this one after fixing some other problems.

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    Quote Originally Posted by drewl View Post
    Anyone ever notice the clean channel on the TSL100 hums more than the other two channels?

    Every one I've seen is like that.

    So far bias is holding steady on this one after fixing some other problems.
    I've had that happen with my Peavey Triumph, IIRC on that one there are some noise reduction diodes on the gain channel.

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    Lifetime Member Enzo's Avatar
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    The noise reduction diodes remove high freq stuff like noise and hiss, not hum.

    If I had to guess, I'd wager the dirt channels have less bottom end. They roll it off so the overdrive doesn't turn into mud. Just a thought.

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    Senior Member Pedro Vecino's Avatar
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    Quote Originally Posted by drewl View Post
    Anyone ever notice the clean channel on the TSL100 hums more than the other two channels?
    I've seen it several times in old models. The system I use to identify those amps susceptible to it (with the same origin as the bias drifting) is looking at the switches. Screen printing is also different in that area.
    Hum problem in clean channel (with the effect more associated with volume than gain) I have sometimes seen before that the drifting bias. In some units, both at the same time.

    Click image for larger version. 

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    Quote Originally Posted by Enzo View Post
    The noise reduction diodes remove high freq stuff like noise and hiss, not hum.

    If I had to guess, I'd wager the dirt channels have less bottom end. They roll it off so the overdrive doesn't turn into mud. Just a thought.


    They usually exhibit the hum even with all clean channel controls turned down.

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    Quote Originally Posted by Pedro Vecino View Post
    I've seen it several times in old models. The system I use to identify those amps susceptible to it (with the same origin as the bias drifting) is looking at the switches. Screen printing is also different in that area.
    Hum problem in clean channel (with the effect more associated with volume than gain) I have sometimes seen before that the drifting bias. In some units, both at the same time.

    Click image for larger version. 

Name:	rocket.jpg 
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    Hmm, interesting.
    This one has the later curved switches. Maybe in between the two different boards.

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    And it definitely has some weird stuff going on.
    Clean channel starts to him when warm.

    Something weird with channel switching where signal to all channels dies.
    That may be a flaky connector.

    Pull on Con5 on clean channel board and it comes back to life.

    Never had to dig into all the functions and cables on these before.

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