Re: How does the HP 42S come apart? Message #2 Posted by Tony Duell on 6 Sept 2005, 6:28 a.m., in response to message #1 by don wallace
Not so much repairing, as upgrading, but that involves taking them apart.
The case is heat-staked together, like most recent HPs :-(. The stakes are in the battery compartment, and under the metal overlay.
Take off the battery cover and cells. I find it best to carefully peel off the overlay -- use a thin screwdriver worked across the machine between the rows of keys. Don't try to pull it up starting at one end, that _will_ crease it. Then cut off the top of the stakes with a 3.5mm twist drill bit held in the fingers. The case will now open.
For _my own_ machines, I just clip the case back together. I find it says together well enough, even without the stakes, to stand up to the usage I give the machine.
Others have said you can leave the overlay in place, drill off the tops of the stakes in the battery compartment, and then pull the machine apart, breaking the stakes at the front edge (the tops of which are under the overlay). While this preserves the appearance of the overlay, I feel the forces involved could damage the keyboard or even the PCB, and I prefer to have a working machine to one that looks perfect (as I've said here and elsewhere, I don't really care what my machines look like).
On the main PCB there's a large TAB chip (CPU, display driver, ROM, etc), and a 8K*8 SRAM chip. Oh, and a few small components, IR LED, etc. There's not a lot to repair. What's the problem with your machine?
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