HP 250C - Manual (Page 137)

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250C
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350C
8Ć3 Troubleshooting C4699Ć90000
What You Should See and Hear
The sequence givenbelow is what should happenwhenyou turnonthe plotter innormal
operating mode.
To observe movement of internal mechanisms, you can keep the cover
switch pressed, while the cover is open. However, in doing so, do not
block the path of the cartridge carriage with anything you stick into
the coverĆswitch area.
C A U T I O N
The possible states of any LED are:
Flashing Can be On or Off ?
Off On
1 All frontĆpanel LEDs flash together twice; the second flash is very short.
2 If a firmware ROM SIMM is installed in the plotter, the following will occur:
The LEDs light up one by one as follows, until eight LEDs are on. This happens three
times.
The LEDs light up one by one as follows, until all nine LEDs are on. This happens
several times throughout the initialization procedure.