Xerox Phaser 7300B, Руководство по обслуживанию, Страница: 85 / 277

Troubleshooting 3-69
POST Faults
There are two kinds of faults: soft and hard.
A soft fault is any fault that is discovered by POST, but does not prevent the operating
system from initializing and becoming available as a tool for troubleshooting. These
POST faults do not stop execution and are reported on the StartPage in a red box after
the system is running.
A hard fault is any fault discovered by POST that prevents the operating system from
initializing successfully. A hard fault prevents the system from further execution and
is halted with blinking LEDs (front panel and health LED). The failed test name of
and “Call Customer Service” is displayed on the front panel.
Fault Reporting Devices
There is one soft fault presentation method:
■
All soft faults are printed on the StartPage.
and three hard fault presentation methods:
■
The Image Processor Board health LED flashes according to the fault code.
■
The front panel LED flashes in unison with the Image Processor Board health
LED.
■
The most recent fault is posted to the front panel.
LED Blink Patterns
For faults identified as hard faults, the POST firmware causes the Image Processor
Board health LED to blink in a repetitive pattern to identify the fault. There are short
and long blinks. A long blink is worth 5 and a short blink is worth 1. If a fault blink
pattern is flashed as long, long, short, short, this is fault code 5+5+1+1=12, which
indicates a failure in the CPU interrupt test, see “POST Diagnostics Test Descriptions
Table” on page 3-70.
Note: The exception to the above pattern is a RAM test error.
The RAM tests have a special blink pattern and the front
panel displays “RAM Error”.