2.4 System Board Troubleshooting 2 Troubleshooting Procedures PORTEGE A100 Maintenance Manual (960-460) 2-23
Table 2-3 D port status (4/7)D port status
Inspection items Details
F105h Initializing and testing( only in Cold Boot) a PIT
Setting a test pattern to the channel 0 of a PIT#0
Checking whether the test pattern can be read.
Initializing PIT channel 0 (Timer interrupt interval
→ 55ms)
Initializing PIT channel 2 ( Frequency for sound
generator →664Hz)
Testing the channel 1 of a PIT( checking whether the
refresh signal is generated correctly in refreshing cycle
of 30 µs)
When a time-out, HLT.
Testing the channel 2 of a PIT (checking whether the
speaker gate operate correctly)
Measuring CPU clock
Enabling SMI other than of auto-off function
Controlling battery discharging current (1CmA)
Control of over current than rated current of AC adapter
Processing of dividing for measuring time of IRT
Initializing CPU
Updating micro-code
Checking of supporting Geyserville
Set the CPU clock to High
Setting Graphics Aperture Size
Storing the memory configuration
Reading EC version
Updating the type of flash ROM
Judging the country of destination
Checking the default settings of CMOS
Bad Battery, Bad CheckSum→default setting
Initializing ACPI table
Setting devices before initializing PCI bus
AC’97 control
Initializing information of thermal control
Initializing a KBC
Turning VGA display off and controlling reset
Initializing sound function
Getting the computer multiple box status
F106h Checking the default
settings of CMOS
Initializing HC and recognizing/initializing USB device
connection