91369 Service Manual 3-15
Theory
• Power-fail circuitry to protect the clock and RAM on power OFF.
• CMOS Static RAM: stores all Configuration Data in 32 K bytes.
- User-defined defaults
- Biomed- and clinical-level settings
- Passwords
- Sysgen Settings
- Event Log
- Touchscreen Calibration Data
Eight-Channel ADC
The 8-channel, 10-bit ADC is used to monitor power supply functions, including voltage and temperature.
Audio CODEC
An Analog Devices AD1845 produces the sound generation for the monitor. It drives an amplifier for the
internal speaker. Line Out functionality is not currently supported.
Interconnect and Connector PCBAs
The Interconnect PCBA plugs directly into the CPU PCBA via J1 (Figure 3-6).
It provides power distribution and EMI filtering for:
• (Optional) Recorder
• (Optional) Recorder CPU
• SDLC (module)
The Interconnect PCBA also provides a signal pass-through to the Connector PCBA, which contains:
• Serial Port
• Analog Video
• External Alarm Relay Output
•SDLC
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