Troubleshooting guide

4–4 335795-006 Troubleshooting Guide
Diagnostics and Troubleshooting
Power-On Diagnostic Tests
The Power-on diagnostics performs basic integrity tests of the
hardware to determine its functionality and configuration. If a
diagnostic test fails during hardware initialization the unit simply
stops. There are no messages sent to video.
✎
You may try to restart the unit and run through the diagnostic tests
a second time to confirm the first shutdown.
The following table lists the tests that are performed on the t5000
units.
Power-On Diagnostic Test
Test Description
Boot Block Checksum Tests boot block code for proper
checksum value
DRAM Simple write/read pattern test of the
first 640k of memory
Parallel port Initiates the port’s driver and
determines if the device is present
Serial port Tests the serial port using simple port
verification test to determine if ports
are present
Timer Tests timer interrupt by using polling
method
RTC CMOS battery Tests integrity of RTC CMOS battery
NAND Flash device Tests for proper NAND flash device
ID present