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Re: 100R Resistor dropped from PSB

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In Reply to: 100R Resistor dropped from PSB of Kit 1!!! posted by BernardYang on April 13, 2005 at 01:33:00:

100 ohm resistor connects amplifier ground to the chassis (another ground) - there should be no current passing it. In your case there are short from chassis to some point with non-zero voltage. 100 ohm / 1W resistor should handle 10 A /0.1 A without melting everything around, obviously you�ve got more then 10V on the chassis �
Regards
Alex

Follow Ups:

Re: 100R Resistor dropped from PSB - BernardYang 19:54:35 04/13/05 (4)
Thank you Alex.
I have sorted out the cause of the problem. The connetion from the PSU board to W15 for 5687 is correct. But .... but!!! surprisingly, there is no connect from W15 on to the next poit -- the foot of 5687!
I took out the wire and solder it onto the foot directly. Now the voltages are all in the normal range.
But, one more but, only one channel sings. Got to check it out this evening.
- Re: 100R Resistor dropped from PSB - scarebus 22:38:45 04/13/05 (3)
  Hi Bernard,
  When I first read your posting saying that you have no
  connection between pins 4&5 5687, I knew that your board
  is missing another connection between W15 & pin 1/C4 on the other
  side. You have a board with IdKIT V3 instead of V4. Look for this
  id # under caps C3 and 4. Once you have installed the two
  missing wires, there's no problem. I'm sure Brian will send you
  another board or you could wait till you upgrade to hardwire
  board.
  Cheers
  Chris
  - Re: 100R Resistor dropped from PSB - BernardYang 01:04:54 04/14/05 (2)
    Thanks a lot Chris.
    I bought my kit 1 from the local distributor here. And I am not sure how long they have kept this in warehouse THOUGH warranty is still effective. Anyway, just ok as long as the problems can be solved.
    My kit one start singing last night but only one channel!!! I am not sure what is going on with this new problem. Can anyone help me out?
    - Re: 100R Resistor dropped from PSB - scarebus 00:50:03 04/15/05 (1)
      If you are getting all the voltage readings as specified, you should get
      sound on both speakers. Double check you're getting 425VDC on pin 1 on both
      300Bs, and 435VDC on W7 and W8 at PSU board. The red and black wires of above
      mentioned go to output trans thus creating 4 ohm/8ohm output.
      Chris
      - Re: 100R Resistor dropped from PSB - BernardYang 19:44:26 04/15/05 (0)
        
        In Reply to: Re: 100R Resistor dropped from PSB posted by scarebus on April 15, 2005 at 00:50:03:
        
        What happened was one 100uf cap on filament board explored. It could be 7805 caused this trouble. Anyway, I repalced the components and fixed the problem. Now, it sings and are quite fine in sound quality though all voltage checked are slightly lower than standard.
        Thank you very much for the helps.

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