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  1. newjeeper369

    PA mixer / amp repair help

    the schematic i have is way too different from what i am working on. i really need to track down the correct schematics. if you know where i may have luck looking let me know. i need schematic for Crate PA-600 power amp, assy pc 07 402 04
  2. newjeeper369

    PA mixer / amp repair help

    i feed music into the line input and got nothing out of the speakers out just the humming.
  3. newjeeper369

    PA mixer / amp repair help

    thanks 73's de edd i was just wishing a minute ago i had a scope at home to see what the power supply caps are doing. i had my own speculations of them being up to the task. your idea of adding capacitance it a good one. i will let you know what it find. as for what Dorke was talking about, i...
  4. newjeeper369

    PA mixer / amp repair help

    Got the last part i was waiting for today for the amp board. i installed and tested, i didn't have long so i didn't get very far but this is what i found. nothing blew up! still seems to be noise, i plugged headphones in the line out sounds like a hum. i used a 5k pot to adjust my headphone...
  5. newjeeper369

    PA mixer / amp repair help

    i use an old HP analog spectrum analyzer at work for offsetting sine and cosine inductosyn errors.
  6. newjeeper369

    PA mixer / amp repair help

    the voltage drop over one of them was a little low, i had new ones laying around so i replaced them.
  7. newjeeper369

    PA mixer / amp repair help

    i have scopes at work, i guess if i had to i could work on it during lunch or after work......i need a scope for home, what do you think about the computer adapters you can get for like 100 bucks?
  8. newjeeper369

    PA mixer / amp repair help

    D15,D16 are one of the first things i replaced. the schematic id a little different for example the schematics shows is should have 3 2n5210s but is only one and 4 2n5087s but only 3. the traces and the layout of the board aren't very organized so it is really hard to tell without taking all...
  9. newjeeper369

    PA mixer / amp repair help

    R34 is 100 ohms from output to ground is a high resistance.
  10. newjeeper369

    PA mixer / amp repair help

    the TRs are from newark so im sure they are legit. ill have to check R34 when i get the chance, Q8-9 (i just replaced) and Q14 -15 (i have new ones im going to install) are what the schematic say they are. i will check the resistance from out to ground, thats a good point it. i have off work...
  11. newjeeper369

    PA mixer / amp repair help

    you suggest i put the original resistors back in? they ohm out fine im sure they are still okay. also do you agree the power transistors i installed are suitable for substitution of the original ones?
  12. newjeeper369

    PA mixer / amp repair help

    going over what i wrote i may have left out some important details. first i replaced the 4 large white 10watt resistors with the .47 ohm one you seen in the picture, the schematics calls for .47 ohm but it has .33ohm resistors installed. i ordered the .47 one before i realized that the...
  13. newjeeper369

    PA mixer / amp repair help

    Questions about the noise. can anybody tell by looking at the schematic if noise would be caused by not connecting the mixer board to the amp if that would generate noise just because the nature of the circuit? i dont want to be chasing my tail troubleshooting the noise issue at the amp board...
  14. newjeeper369

    PA mixer / amp repair help

    thank you, you raised some good questions. first off the transistor with the heat sink i found to be a 2n3404. i will answer in the order asked. yes yes didnt seem like it, i didnt have much time till the fuse blew didnt try, i will though when i get it that fare next time. i will try when i...
  15. newjeeper369

    Transistor or temp switch attached to heatsink? Crate PA-600 repair

    https://www.electronicspoint.com/threads/pa-mixer-amp-repair-help.275398/
  16. newjeeper369

    PA mixer / amp repair help

    some of this is from a thread i started earlier but all information should be here. As far as the amp goes, when i received the amp it was taken apart in two parts, the mixer part which is the top piece and the amp and power supply, the bottom piece. it also was missing its main 5 amp fuse...
  17. newjeeper369

    Transistor or temp switch attached to heatsink? Crate PA-600 repair

    i think i will start a new thread for this repair with good photos and schematics.. i will post link on this thread when i do. might not have the chance tonight.
  18. newjeeper369

    Transistor or temp switch attached to heatsink? Crate PA-600 repair

    I found the part it is a 2N3404 http://www.ebay.com/itm/2N3404-GE-SILICON-NPN-TO98-WITH-HEAT-SINK-900mW-0-5A-50V-NOS-/141756210981? When i got the heat sink under better light i found the part number. i didn't think the part number would be on the heat sink but i guess the heat sink is part of...
  19. newjeeper369

    Can anyone identify these components? They are SMD

    possibly a ceramic surface mount fuse??? is the component in a type of clip you can remove it from? need better picture.
  20. newjeeper369

    Help identify this please.

    thanks makes a lot of sense does the e5k mean anything?
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