[sdiy] Latest broken toy (TR-909) --- update

[Chad Coffman]

Okay, after spending some time inspecting and blowing dust off the insides, I pieced the 909 back together and turned it on. Everything seemed to work, except that the sw_board occasionally shorts (?). I wonder if I should take it apart again and give it a proper cleaning, since the initial inspection/dusting/rebuilding seemed to have somewhat of a beneficial effect.
  ----- Original Message ----- 
  From: Chad Coffman 
  To: diy synth 
  Sent: Tuesday, July 12, 2005 3:25 PM
  Subject: [sdiy] Latest broken toy (TR-909)


  Okay, the broken TR-909 arrived today. The problem associated with the unit was described as "will sometimes power up and work for a minute or so, but it always locks up.  Sometimes it wont power up at all." I tried a few times to get the unit to power on but was not able to. I took it apart and inspected the boards. To my newbies eyes, everything appeared okay. The pcbs didn't have any cracks, the solder looked good (no cracks), no burnt diodes or popped capacitors or anything of the sort. Everything was complete, and the unit wasn't too dirty or dusty.

  Beyond this initial inspection I don't know where to continue. I have a cheapy multimeter, but haven't taken the time to learn to use it. Would this be the ideal time?

  Thanks in advance,


  Chad
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