Compaq 1592DMT Compaq Armada 1500 Family of Personal Computers Maintenance and - Page 87

7.3 Design Overview This section presents a design overview of the computer. The overview is limited to field replaceable parts. All replacement parts are listed in Chapter 4. 7.3.1 System Unit The computer is a traditional clamshell design with a display unit attached to a system unit. The computer opens to reveal a backlit LCD display and a full-sized keyboard. The display is designed for a continuously adjustable tilt angle. 7.3.2 Internal Boards The system electronics are integrated on five printed circuit assemblies: the LED status panel, audio board, system board, serial-parallel port board, and the DC-DC converter board. s The LED status board connects the system board to the display cables and supports the status LEDs. s The DC-DC converter board creates the CPU (2.9v or 2.5v) and system voltages (3.3v and 5v) from the battery or AC/DC input. s The system board integrates the processor, memory, level 2 cache, local bus video adapter, PCMCIA/CardBus adapter and audio controller. Processor The processor located on the system board for the 120 MHz and 133 MHz models is the Intel P54LM Pentium processor. Memory Base memory is 16-MB with 8-, 16-, 32-, or 64-MB of optional expansion memory. Base memory is onboard memory built into the system board. Expansion memory consists of one memory expansion board available as a user installable option. Cache Level 2 cache, available on some models, is soldered on the system board. The level 2 cache 256-Kbyte is a pipelined synchronous burst design. It is not user upgradable. Audio Controller The audio controller is located on the system board. The audio amplifiers and connectors are on the audio board printed circuit assembly. Computer Removal and Replacement Procedures 7-3