[sebhc] H89 Power-up problems.
rogbirk at gra.midco.net
Mon Jul 3 06:24:37 CDT 2006
Does the keyboard have a connector on the cable? If the unit was stored in a
damp area there may be a small amount of corrosion on the connector pins.
Just a thought.
> Does anyone know what the power up beeps mean? One of my H89's beeps
> twice on power-up (on-line) and once if off-line key is depressed.
> This H89 works fine. Another one I recently received, only beeps once
> on power-up (on-line) and zero (off-line). It was initially working
> fine, but now the keyboard no longer works (except for the
> 'shift-reset' combo), all other keys don't even keyclick (they had
> initially). It doesn't matter with if it's on-line or off-line, no
> keys work except for the 'shift-reset'.
> Between the time it was working and now, during a few power-ups the
> screen the screen went a little crazy, for example, the "H:" was
> shaking and showing up in two places, another time various characters
> showed up on the screen. I'm wondering if a CAP or other component
> failed. I've looked through the operation/service manual, that have,
> but it provided no trouble-shooting except for the power supply or
> video. First, I was thinking the cable to the keyboard may have been
> loose, but since the reset works, I doubt that is the issue. Without
> the keyboard, the only diag I could get to is the memory test (by
> setting switch SW501). That test runs without any errors.
> If anyone has any ideas why the keyboard would suddenly stop working
> or what areas I can look at, let me know, otherwise it looks like it
> may become my spare-parts machine.
> BTW: The memory is installed strangely in the system. The top row of
> memory ICs have a second memory chip soldiered on top of each one,
> along with a wire that connects them all to one of the lines on the
> slot that you would normally install the extra memory card to bump it
> up to 64k. This must have been a cheaper way to get to 64k than adding
> the board.
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