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  • Re: Beomaster 1200, Supply Voltage.

    Hi Dillen Here is a picture of my #1 attempt, which is what I thought I needed to do:
    Posted to The Workbench (Forum) by Jamian on Sun, Jul 3 2016
  • Beomaster 1200, Supply Voltage.

    Hi Recapped my BM1200 (Dillen’s kit). It works but there are some challenges I need help with. Here is the first - Supply Voltage (33V target) Input is set to 110 (USA). Am I taking the reading correctly? If so what could be the challenge? 1. What I though I should be doing: Attach the multimeter (DC auto) to 456 and ground off the power supply board = I get 55V and it does not change as I adjust 459. 2. Tried connecting to the neutral: Attaching to 456 and the neutral line = I get 28V, which
    Posted to The Workbench (Forum) by Jamian on Sun, Jul 3 2016
    Filed under: Beomaster 1200, supply voltage
  • Re: Bemoaster 1200, 3000uf Capacitor Polarity

    OK, sat down with the service manual this evening - Using the PCB diagram (and looking at the actual PCB), I can see that the yellow wire goes to TR36 and the orange to TR38: Then looking at the circuit diagram I could see that T38 goes to the Left Speaker cap +ve and T36 goes to the Right Speaker cap +ve. So, orange and yellow will connect to the cap +ve pins. Using the PCB diagram (above) and following from the speaker connections back to the caps confirms the blue and green wire connections: So
    Posted to General Discussion & Questions (Forum) by Jamian on Fri, Jan 29 2016
  • Re: Beoworld Lovlies

    Come on, give a warm welcome to the newest member
    Posted to General Discussion & Questions (Forum) by Jamian on Fri, Jan 29 2016
  • Bemoaster 1200, 3000uf Capacitor Polarity

    Hi Almost finished the re-cap of my BM1200. Only thing is I am totally unsure of the correct connection of the 2 3000uf caps. One had clearly marked polarity, but the other was an old original Wicon. I can not decipher its polarity marking. I attached the multimeter to determine polarity but do not trust the outcome. Rather than run the risk of blowing up my hard work, I am posting to see if some one can tell me which wires (yellow, green; orange, blue) go to positive and negative (obviously the
    Posted to General Discussion & Questions (Forum) by Jamian on Wed, Jan 27 2016
    Filed under: Beomaster 1200, BM 1200, capacitors, caps, 3000uf, plain negative
  • Re: Beomaster 1200 Cap Access

    OK, I eventually figured it out. Didn't actually take from May 2015-Jan 2016; just took that long to find the time to finish this project :) Took off the wooden trim, just find these four bits and remove: Then removed the rear part of the chassis (the four silver screws and 2 more on the other end). Could then gain access to all caps: All done: :)
    Posted to The Workbench (Forum) by Jamian on Wed, Jan 27 2016
  • Re: Beomaster 1200 Cap Access

    Hi I am working with a kit from Dillen, so figuring I have all I need. All the dark yellow tantalum caps are replacements. The old ones were green and some were red. Almost finished now, just figuring out the polarity of the 3000uf caps. The old ones were not well marked (started another thread about that). Then I'll move to adjust trimmers... Cheers
    Posted to The Workbench (Forum) by Jamian on Wed, Jan 27 2016
  • Re: Bemoaster 1200, 3000uf Capacitor Polarity

    The cap does read 'plain negative.' I looked that up on line and found a guy who had the same challenge as me on a different amp. He concluded the flatter/simpler pin was +ve. that contradicts my DC reading on my working BM1001. What does 'plain negative' mean? There is a slight difference between the pins in the BM1001 (Last image above). The left looks like a slightly smaller diameter and has an impression in it. The right is slightly flatter.
    Posted to General Discussion & Questions (Forum) by Jamian on Wed, Jan 27 2016
  • Re: Bemoaster 1200, 3000uf Capacitor Polarity

    Hi Orava - I simply got my cap kit from Dillen (he has posted below. You could PM him). Comes with simple visual instruction. I also referred to the user manual to help locate pins on the back of the PCBs and will use in a while to adjust the trimmers.
    Posted to General Discussion & Questions (Forum) by Jamian on Wed, Jan 27 2016
  • Beomaster 1200 Cap Access

    Hi Replacing the caps in my Beomaster 1200. Was hoping not to have to take the whole thing apart, but the back of some of the 100uF caps (301, 367, 317, 379) on the preamplifier board are covered by the din socket board. What to do: A) Desolder the din socket board and remove. B) Work on removing the whole preamplifier board. Looks like I'll have to at least desolder it from connections to several other boards. C)There is another way? Thanks for the help! Any other tricky caps I am going to run
    Posted to The Workbench (Forum) by Jamian on Sun, May 31 2015
    Filed under: Beomaster 1200
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