HP CH336A#B1K Bedienungsanleitung PDF herunterladen (Seite 269)

Functional Overview

10-5

HP DesignJets 500, 510 and 800 Series Printers Service Manual



The memory bus is also used to control Navata gate array. Navata

is a customized ASIC to control most of the Printer’s sensors (ISS

optical sensors, pinch wheels, digital encoder, etc.), Power

Supply, Scan-Axis Motor driver, Vacuum Fan, Front Panel,

Carriage, etc.

 A 16k serial EEPROM is used to store different line calibration

parameters and the Printer’s life history (number of plots, etc.).

The ISS PCA also contains an EEROM that contains a backup of

all critical parameters from the Main EEROM.

 The Main PCA has an analogue IC which controls two DC

motors (IDS and paper) and one stepper motor (Service Station).

This IC, as well as the IC in the Carriage PCA, is controlled

through the VPR serial interface from the Kayak ASIC at a bus

clock frequency of 1.6MHz.

 From the Main PCA the Interconnect Cable connects to the

Interconnect PCA (located on the right hand side of the Printer)

which then splits into different subsystems: Front Panel, IDS

PCA, Service Station and media loading sensors (pinch, media

sensor and media button).

 Two discrete drivers are implemented for the Carriage Motor

driver and the Vacuum Fan.

 The Main PCA comes with fully protected motor drivers for

Carriage, Paper-Axis, Service Station and IDS motors. Any

short-circuit will be detected and protected.

 Trailing Cables come with an interlock loop that will prevent

from turning on voltages in the Carriage while the Trailing Cable

is not properly connected. A similar approach of using an

interlock pair is used in the Interconnect Cable to ensure it is

properly connected.

 The EIO slots do not allow for hot insertions while the machine is

powered. That is why it is very important to always power-off

the Printer before inserting the EIO Card or the Formatter

or else the Main PCA could be burned.

 Serial channel, to be used for line production and service

purposes only, will be isolated from Kayak pins with a GPIO in

the Navata ASIC.

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HP CH336A#B1K Bedienungsanleitung Seite 269