Chapter 7 Service Notes - Compaq 141536-002 - Deskpro EN - MT RAMBUS Maintenance And Service Manual

7
chapter
S N
ERVICE OTES
CAUTION: Use safety glasses equipped with side shields before attempting to clean debris from
under the keys.
1. The new Intel 815e chipset in these models is a high-performance, flexible technology
that also provides stability for future models. This chipset supports PIII processors with
100- or 133-MHz front-side bus, as well as non-ECC PC100 or PC133 SDRAM.
2. Although some of these models ship with Ultra ATA/66 hard drives, the chipset also
supports Ultra ATA/100 technology. The chipset also provides for integrated 3D
graphics, USB capability, and 10/100 media access controller integration.
3. The processor die is mounted upside down on a board. The heatsink mounts directly to
the back of the die. The die is centered in the processor package, but the processor is
offset in the system board socket because of the hinge for the lever arm. The heatsink
and the clip must be properly aligned to ensure that the clip pushes the heatsink flat
against the processor die.
If the heatsink is mounted improperly, the processor will run at a higher than normal
temperature, making the fans to run faster to cool it down. The processor is protected
from thermal damage in two ways: First, a hardware circuit monitors the temperature
of the processor and causes it to throttle back (run much slower) if it exceeds a much
higher than normal operating temperature. Second, the processor will shut down when
it reaches 135 degrees C to prevent damage. If Compaq's DMI software is installed, the
user receives a warning about any elevated temperature in the processor.
4. Unplug the power cord before installing or removing any PCI boards, since the PCI
slots are hot with auxiliary power. If the power cord is not unplugged, damage to the
boards can occur.
5. The following setup is required for system memory to run at 133 MHz:
!
a 133-MHz front-side bus processor must be installed
!
all installed DIMMs must be PC133
!
no more than four loads (four sides of SDRAM) on the data lines
In all other cases, the system BIOS downshifts the memory to 100 MHz.
6. The 10-GB Ultra ATA hard drive in the new Deskpro EN Series configurations
features a "quiet seek" mode that reduces the noise level of the hard drive by 7 decibels
during search operations. This feature, however, must be enabled from F10 Setup and
may affect hard drive performance by about 10 percent in some cases.
There are unique spare part numbers for Ultra ATA hard drives with and without the
quiet seek feature.
Compaq Deskpro EN Series of Personal Computers 7-1