Standard startup process
When the product is unplugged or the power is off, the firmware code is stored on the formatter in two
blocks. The first block of code is an executable boot block (about 64K of code). The second block of
code is a compressed version of the product control code.
When the product is turned on, the boot block decompresses the product control code and stores it in
RAM. Then the product performs a full startup with the control code running from RAM.
Product startup messages
The LCD display contains different messages depending upon the progress of the boot process.
Table 5-3 Product startup messages
Message Cause Solution
-blank-
[blank display for many seconds after
power-on]
Boot-block failure Use the power switch to turn the power
to the product off. Check all wire-harness
connectors and FFCs to make sure that
they are firmly connected.
Replace the formatter.
Boot Code ## Control-code failure Replace the formatter.
Hewlett-Packard The product is starting up. Wait for the Ready message.
Ready Startup is complete and the product is
ready for use.
Begin using the product.
RAM
The product contains two types of random-access memory (RAM):
●
One bank of nonvolatile RAM (NVRAM) stores parameters.
●
Dynamic random access memory (DRAM) provides temporary storage of the product program
code and copy, scan, and print data.
USB interface
The formatter receives incoming data through its USB interface. This interface provides high-speed,
two-way communication between the product and the host, allowing you to change product settings and
monitor product status from the host computer.
Control panel
The control panel consists of the following features:
●
Groups of buttons to control fax, copy, and configuration functionality
●
A 2-by-16 LCD display that shows status, menus, and messages
●
Front-panel status lights
42 Chapter 5 Operational theory ENWW
To Next Page
Loading...
