HP t628 t628 Thin Client - Page 53

Resetting the Setup and Power-on passwords, Power-on diagnostic tests

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Resetting the Setup and Power-on passwords You can reset the Setup and Power-on passwords as follows: 1. Turn off the computer and disconnect the power cord from the power outlet. 2. Remove the side access panel and the metal side cover. 3. Remove the password jumper from the system board header labeled PSWD/E49. 4. Replace the metal side cover and the side access panel. 5. Connect the computer to AC power, and then turn on the computer. 6. Turn off the computer and disconnect the power cord from the power outlet. 7. Remove the side access panel and the metal side cover. 8. Replace the password jumper. 9. Replace the metal side cover and the side access panel. 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. NOTE: 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 unit. Table B-2 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 Resetting the Setup and Power-on passwords 47

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Resetting the Setup and Power-on passwords
You can reset the Setup and Power-on passwords as follows:
1.
Turn
off
the computer and disconnect the power cord from the power outlet.
2.
Remove the side access panel and the metal side cover.
3.
Remove the password jumper from the system board header labeled PSWD/E49.
4.
Replace the metal side cover and the side access panel.
5.
Connect the computer to AC power, and then turn on the computer.
6.
Turn
off
the computer and disconnect the power cord from the power outlet.
7.
Remove the side access panel and the metal side cover.
8.
Replace the password jumper.
9.
Replace the metal side cover and the side access panel.
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.
NOTE:
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 unit.
Table B-2
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
Resetting the Setup and Power-on passwords
47