Actions
Forum Thread Details
  • State Verified Answer
  • Replies 18 replies
  • Answers 3 answers
  • Subscribers 15 subscribers
  • Views 426 views
  • Users 0 members are here
Related

Miller Boost Circuit Board Assembly NO. 200841

lanuser

Hello everyone,

Let me tell you small story

While back I have purchased dead  "MIller Dynasty 200DX"

After some repairs I have found damage to Boost Board that has internal ground planes  burnedout.

I have realisedthat i would need board replacement, however, board is dicontiniued and replacement board will cost me 2000 dollars if I found one.

After fiew hundret emails  and phone calls to different suppliers without even one ansfer I have desided  recreate board from scrach and make my own.

Fiew month later after reverse engineering pcb to schematic  and later on from schematic to PCB i have finally received new boards.

I have solder necesseryparts and run test on new assembled board, however, I have forgot take a maguments from resistor R86

Could some one be so kind and provide value number between pin 2 & 3 on R86?

Here is some pictures from original board and final my creation:

 

Parents
  • 0

    Hi Alex,

     

    Reverse engineering a board of this size and complexity is a monumental task. Congratulations on what you have accomplished. Sorry I don't have the information you are looking for but your work caught my attentions and I wanted to say I hope you get the reading you need and I hope it all works out.

     

    John

  • 0 in reply to jw0752

    Josh,

    First of thank you for your reply.

    Is to easy to reverse engineering this board, however, it is time consuming a speacially when team of one working on entire project.

    I'm planing some changes for Rev 2.0 of this board, such as an absolite unshielded inductor L1, VR4 LDO that converts +30V to +15V and getting HOT under formal coating without heatsink by manufacturer, adding fuses.

    After reviewing design i came to conclusion! When VR4 fails under heat it damages boost board that cost $2000 dollars and also damages the main board that cost $1600.

    None of these boards has ANY fuses!

    In any case, if i could get Ohm value between pins 2 and 3 on R86 it will really help.

    R86 has 3 pins and it is a verablabe resistor.

    pins 1&2 are shorted together by design and pins 2-3 has Ohm /K Ohm value between 0 to 10K

Reply
  • 0 in reply to jw0752

    Josh,

    First of thank you for your reply.

    Is to easy to reverse engineering this board, however, it is time consuming a speacially when team of one working on entire project.

    I'm planing some changes for Rev 2.0 of this board, such as an absolite unshielded inductor L1, VR4 LDO that converts +30V to +15V and getting HOT under formal coating without heatsink by manufacturer, adding fuses.

    After reviewing design i came to conclusion! When VR4 fails under heat it damages boost board that cost $2000 dollars and also damages the main board that cost $1600.

    None of these boards has ANY fuses!

    In any case, if i could get Ohm value between pins 2 and 3 on R86 it will really help.

    R86 has 3 pins and it is a verablabe resistor.

    pins 1&2 are shorted together by design and pins 2-3 has Ohm /K Ohm value between 0 to 10K

Children