HP 750 - Manual (Page 120)

8-2 Troubleshooting C4705-90000
Diagnostics Ć Self Test
Introduction
This chapter deals with the various options available to the engineer in solving technical
problems with the plotter:
D Service tests performed automatically via the Service Menu.
D Diagnostic selfĆtests reporting errors via worded messages and number codes.
D Troubleshooting routines designed to guide the engineer to the source of the problem and
suggesting solutions.
Initialization Sequences
Whenever the the plotter is switched on, it automatically performs a series of internal self
tests and mechanicalinitialization sequences.
Switch ON Ć Normal Behavior
When the plotter is switched on:
1 AllfrontĆpanelLEDs flash.
2 The display shows one dot and the fan turns on.
3 The display shows two dots and the message Status/Initializing" is displayed on the
frontĆpanel.
4 The wiper stepper motor is initialized.
5 The cartridge carriage knocks against the left side of the plotter.
6 The cartridge carriage moves across the plotter and knocks three times against the right side of
the plotter.
7 The carriage returns to the left side of the plotter and the primer sensor is initialized.
8 The plotter checks if the cartridges require calibration and, if so, performs it (Brilliant
Pulse Warming and/or pen energy calibration). If the black cartridge is not detected the
display shows Cartridge Missing".
If any of the color cartridges is not detected, the plotter is set to monochrome mode (only
applicable to DesignJets 750C, 750C Plus and 755CM).
9 If sheet media is loaded, it is pulled into the plotter.
10 The mark encoder is located by the line sensor.
11 If roll media is loaded, the margins are checked. If no media is present, the display shows
Status/Ready for Media".
12 If required, the plotter performs the cartridge alignment.
13 The message Status/Ready" is displayed on the frontĆpanel.