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  1. Replies
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    Here is a repost of the above schematic files: ...

    Here is a repost of the above schematic files:
    56977
  2. Replies
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    Sounds to be as if U6 may be at fault. Is the...

    Sounds to be as if U6 may be at fault.
    Is the signal path 9/13, 11/12 good & does it change state with the switch?
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    321

    " I tried to measure the voltages on the...

    " I tried to measure the voltages on the secondary of the main transformer using the (-) of the bridge".
    Whoa Nellie.
    Most SMPS 's have the primary supply and the secondary supply isolated.
    It...
  4. How about a pic of the output transistors? Look...

    How about a pic of the output transistors?
    Look to see if they are shorted.
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    Here is the schematic: 56844

    Here is the schematic: 56844
  6. Replies
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    Here are the schematics: 56834

    Here are the schematics: 56834
  7. Replies
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    104

    There is very little real info on that...

    There is very little real info on that manuafacturer.
    Open it up.
    How is it wired.
    I would expect it to be Fenderish like a Bassman.
  8. Here is the complete schematic 56809

    Here is the complete schematic 56809
  9. Replies
    1
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    109

    Here you go: 56808 Oops. That is the non...

    Here you go: 56808

    Oops. That is the non chorus amp.

    If that helps great.

    If not, as always, your best bet is to CALL Peavey and ask.
  10. Oops. I did not take note that the issue is with...

    Oops.
    I did not take note that the issue is with the HT fuse removed.
    The way I see it is you have 2 .022 caps, 2 100uf caps and 4 diodes.
    Build a bridge on the bench and try to power that up.
    No...
  11. I would disconnect the high voltage to the output...

    I would disconnect the high voltage to the output transformer.
    That would isolate the main B+ from the preamp voltages.
    If everything holds up, I would tend to think the OT is shorting.
  12. First off: "- plugging into either guitar jack,...

    First off: "- plugging into either guitar jack, and running cable from Pre Amp Out to a 1x12 cabinet, no sound in that speaker, but low volume in amp."
    The Preamp Out is a signal meant to go to...
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    Try measuring the potentiometer 'out of circuit'....

    Try measuring the potentiometer 'out of circuit'.
    Here is a copy of the BR-4 that shows the control as a 500K.
    56787
  14. I would try the Preamp out jack by inserting a...

    I would try the Preamp out jack by inserting a cable & 'sending' the signal to another amp.
    If that works then you have an issue with the Power Amp In jack itself.
    The fact that plugging in to the...
  15. Replies
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    Here is the RT 922. 56777 Not much help in the...

    Here is the RT 922.
    56777
    Not much help in the voltage section as they are not marked.:(
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    Not sure if it is even close but here is the...

    Not sure if it is even close but here is the Rockerverb MKI: 56727
  17. Try this for a schematic:...

    Try this for a schematic: https://music-electronics-forum.com/attachment.php?attachmentid=47308&d=1519629152
  18. I believe what Enzo is trying to tell you is that...

    I believe what Enzo is trying to tell you is that the +10 v supply comes from the main board.
    J10.
    56713
    If you do not have that voltage then there is no use even looking at the DSP board.
    In...
  19. Replies
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    207

    Not having a schematic for the EM25 I went...

    Not having a schematic for the EM25 I went looking at other newer Eden amps.
    It seems that they prefer .01 uf 250V capacitors across the secondary.
    56710
    If C52 was shorted or trying to short,...
  20. My next step, seeing that Q3 has been replaced ,...

    My next step, seeing that Q3 has been replaced , would be Q2.
    Why is the Collector & Emitter voltage the same?
    A PNP transistor with a high voltage on the Base should have very low voltage on the...
  21. Replies
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    338

    A multi meter to me is the way to go. DC...

    A multi meter to me is the way to go.

    DC coupling cap? check for Vdc leakage.
    Filter capacitor? check for abnormal amounts of Vac ripple.
  22. Looking at your voltages the first item that...

    Looking at your voltages the first item that jumps out is the Base voltage of Q3 being so high.
    So either it is faulty or Q4 is (or both).
  23. I would suggest that you also check the mosfet...

    I would suggest that you also check the mosfet that EXT is driving.
    Check to see that it is not shorted.
  24. Replies
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    TP1. 4mv @ 1KHz

    TP1.
    4mv @ 1KHz
  25. Something is not right. Either the IC or the...

    Something is not right.
    Either the IC or the mosfet. (or both)
    The EXT pin should be modulating the mosfet.
    Do you have a scope?
    The IC itself is a voltage regulator that will bring the battery...
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    Here is a good history on the 'Phillips'...

    Here is a good history on the 'Phillips' screwdriver: https://www.youtube.com/watch?v=R-mDqKtivuI
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    There goes my coffee! Got a real kick out of...

    There goes my coffee!

    Got a real kick out of his gloves catching on fire (@ 3:06)
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    Good reading:...

    Good reading: http://thevalleywoodworker.blogspot.com/2016/01/the-many-faces-of-phillips.html
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