From: user@example.net   
      
   On 1/25/2025 3:13 PM, ehsjr wrote:   
   > On 1/25/2025 12:29 PM, bitrex wrote:   
   >> I have a Korg SDD 3300 triple digital delay rack unit that was a bit   
   >> of a basket case when I got it. Someone had tried to "fix" it at some   
   >> point and it had a number of issues including the wrong voltage   
   >> regulator slapped in the negative rail, miswired output jacks, dead EL   
   >> backlight, bad SRAM 2032...   
   >>   
   >> Fixed that up and I was able to get a copy of the service manual and   
   >> use the three-finger-salute button combo to get its mind back after   
   >> SRAM battery replacement as is common on units of this vintage,   
   >> followed the adjustment procedure in the service manual and everything   
   >> seems to work as it should now except one really irritating   
   >> intermittent fault remains: the LCD will occasionally garble up at   
   >> power-on or in use as so:   
   >>   
   >>    
   >>   
   >> It's annoyingly unpredictable and seems somewhat related to how it's   
   >> mounted? I can power it up 25 times on the bench and it works fine   
   >> making me think I solved the problem, then slide it back in the rack   
   >> and it starts acting up again.   
   >   
   > When the failure is position sensitive, look for a bad switch or cable   
   > that causes a line to float between a logic 0 and 1.   
   >   
   > War story: I had a bad ice maker in the freezer that failed only when it   
   > was installed. Worked 100% on the bench and not possible to troubleshoot   
   > when installed. Turned out to be a bad micro switch that failed (high   
   > resistance instead of ~0 ohms when closed) only when I held the thing at   
   > an angle.   
   >   
   > Your problem looks like a tough one if it's a switch or cable. :-(   
   >   
   > Ed   
      
   Thanks for your suggestions, I feel like there was some substance use   
   going on when this unit was designed and servicing it makes me feel the   
   same way so at least there is symmetry..   
      
      
   --   
   This email has been checked for viruses by AVG antivirus software.   
   www.avg.com   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)