HP 250C - Manual (Page 136)

330
350C
330
350C
8Ć2 Troubleshooting C4699Ć90000
PowerĆOn
The plotters automatically perform a series ofinternal selftests and mechanical initialization
sequences whenever the user switches the plotter on. These are completed after about 30
seconds. If a failure occurs, an error is indicated on the frontĆpanel LEDs. You can perform a
failure analysis by interpreting the LED error code. (Details ' later in this chapter.)
Self Test and Initialization
The powerĆon selftest and initialization procedure does the following:
1 Initializes the servo processor.
2 Initializes the main processor.
3 Tests communication between the main processor and the servo processor.
4 Tests the EEROM checksum.
5 Tests the servoĆprocessor transfer buffer and interrupt tracking.
6 Tests the ROM checksum.
7 Causes the main processor to initialize certain firmware modules.
8 Performs a subset of the electrical service test.
9 Checks the cover sensor.
If the cover is open, nothing further happens until you close it.
10 Initializes the carriage axis (YĆaxis).
11 Uses the mark encoder to check the start ofthe drive roller.
12 Ejects any loaded sheet.
Does not eject roll media if loaded.
13 Checks the media sensor.
14 Sets the plotter to accept media.