Re: HP 9830 maintenance Message #2 Posted by Tony Duell on 7 Dec 2006, 2:50 p.m., in response to message #1 by Petr Horský
At the very least :
Remove the top cover, PCB hold-down (1 screw) and keyboard (4 screws underneath).
Then remove all the PCBs and modules. The display board has 1 screw in the centre, the PSU board (rearmost in the machine) has 2 countersunk screws on the heatsink bracket. The tape drive is held down by 2 screws, the ROM module cage by 4 screws.
Inspect all parts for burnt/damaged components, etc. Check the setting of the voltage selector switches at the back, and the rating of the 2 fuses.
Put the PSU board back in place and fit the screws. Connect the keyboard mains switch cable (the 6 pin mate-n-lock), but do not connect the logic cable (paddleboard to backplane edge connector) yet.
Connect mains, and check the voltages at the marked testpoints on the PSU PCB (this PSU will run fine with no load).
If everything checks out, unplug it from the mains, put the boards back in place, connect the keyboard logic cable and refit the keyboard. Power up and see if it works. If not, you have a nice bit of logic troubleshooting to do.
There's the official service manual ('boardswapper guide') and 'my' schematics over on the Australian site.
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