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 Robotics / Handy Board / 7643
7642  |  7644
Subject: 
Re: handy board troubles...
Newsgroups: 
lugnet.robotics.handyboard
Date: 
Wed, 22 Mar 2000 03:07:06 GMT
Viewed: 
1377 times
  
In lugnet.robotics.handyboard, Fred G. Martin writes:
re: this problem with the memory contents not persisting, check the
separate power supply to the RAM (U14).  you might need to remove all
socketed ICs from the board 'cause power can bleed to chips via input
pins.

Yes, that was indeed the problem.  Upon removing all the ICs, the power
to U14 disappeared.  What could cause this, a blown fuse at F1?



Message has 1 Reply:
  Re: handy board troubles...
 
that's possible, it's easy enough to test (just check continuity across F1). more likely that U14 croaked. is there batt pwr on its input side. f. In your message you said: (...) (25 years ago, 22-Mar-00, to lugnet.robotics.handyboard)

Message is in Reply To:
  Re: handy board troubles...
 
re: this problem with the memory contents not persisting, check the separate power supply to the RAM (U14). you might need to remove all socketed ICs from the board 'cause power can bleed to chips via input pins. also check that U12 the DS1233 is (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)

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