Theory
91369 Service Manual 3-2
Major System Components
Main Enclosure
The main enclosure includes the CPU, Interconnect, and I/O PCBAs, with one integrated module slot. The
main enclosure does not include an AC-to-DC power supply. AC-to-DC power conversion is provided by an
external DC supply. The external supply provides 18 VDC, which is internally converted to generate
appropriate operating voltages.
The data processing and control hardware all reside on a single CPU PCBA consisting of:
• Memory subsystem that incorporates Flash, synchronous DRAM, SRAM, and NVRAM.
• Host subsystem that runs the system software and interacts with peripheral devices.
• Graphics subsystem that generates the display.
External Connectors
The monitor’s external connectors are listed in Table 1.
Table 1: External Connectors
Reference Connector Description Pinout
Figure 2-3
on page 2-4
5-pin DIN
male
Power input
3RETURN
4+18 Input
Figure 2-3
on page 2-4
9-pin SDLC connector
1GND
2Data +
3Data -
4+5 V
5+12 V
6 Clock +
7 Clock -
8 -12 V
9GND
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