Re: Repair HP-01 Watch Message #2 Posted by Tony Duell on 2 June 2005, 2:06 p.m., in response to message #1 by Joe Bates
The HP01 is a _very_ difficult machine to repair. The electronics is one hybrid module consisting of 2 ceramic 'circuit boards' with the bare silicon chips mounted on one of them and bonded out (connected) with gold wires. These 2 boards are then glued together to protect the ICs and wires. A display module is soldered to one edge of this assembly. The front ceramic circuit board has the keyboard contacts on it, the 2 boards are electically connected by a zebra-strip type connector pushed between them (outside the sealed area containing the chips).
Basically, if cleaning contacts doesn't fix it, there's not a lot that can be done. You can't normally use parts of 2 machines to make one good one (unlike HP handhelds, where it's common to take chips from several machines, solder them to the circuit board to make a working one). You would need to find a complete working HP01 module.
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