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  • Marshall MG100HCFX

    Hello all,

    I have this Marshall MG100HCFX Head version in for repairs. I was told it has a cracking volume. Tested it with headphone and confirm. Sprayed it then try to test with headphone and a speaker from another amp. No positive result. I just noticed a fan inside facing downward. I did not see this prior. My questions are.

    Is the fan suppose to spin from start up?

    Is it safe to power up without speaker load?

    Can I connect only one 8 ohm load at one of the speaker out? Or must I use two?

    With some schematics it could be comprehending to be sure where the signal path are for me to scope around since I opened the amp.

    Thank you kind folks.

    Click image for larger version  Name:	Fucking MG100HCFX.jpg Views:	0 Size:	3.78 MB ID:	918618
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  • #2
    doesn't promise much but ...

    https://music-electronics-forum.com/forum/schematic-requests/50366-request-marshall-mg100hcfx-schematic

    contact doctor (pm)
    Who does not know and knows that he does not know - teach him Confucius)
    Who knows and does not know that he knows - wake him Confucius)

    Comment


    • #3
      Originally posted by ahseng View Post
      Hello all,

      I have this Marshall MG100HCFX Head version in for repairs. I was told it has a cracking volume. Tested it with headphone and confirm. Sprayed it then try to test with headphone and a speaker from another amp. No positive result. I just noticed a fan inside facing downward. I did not see this prior. My questions are.

      Is the fan suppose to spin from start up?

      Is it safe to power up without speaker load?

      Can I connect only one 8 ohm load at one of the speaker out? Or must I use two?

      With some schematics it could be comprehending to be sure where the signal path are for me to scope around since I opened the amp.

      Thank you kind folks.

      Click image for larger version Name:	Fucking MG100HCFX.jpg Views:	0 Size:	3.78 MB ID:	918618
      fan should spin when the temperature gets very hot on the power amp,at idle in normal condition it never starts.
      yes ,transistor amps don't need a load.
      this amp is a real pain,because of all the programming features they added,ruining both sound and reliability.

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      • #4
        I bet fan/heatsink designer "other job" is designing motherboards.
        Juan Manuel Fahey

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