4535 612 10261 HD11 Service Manual Page 73
CSIP Level 1 Theory of Operation: Functional Description
System Control
Panel
The system control panel contains the circuitry to process control inputs from the system key-
board, the knobs and slide controls, and the trackball. It includes the following functions:
• A USB cable that provides power for the QWERTY keyboard, the trackball, and the Enter
and Select keys
• An auxiliary cable that provides power for the rest of the keyboard keys, backlighting, and
the amplifier for the speakers
All control inputs and LEDs are controlled by the system’s PC, and their functions are deter-
mined by resident control-panel and system software.
Circuit boards inside the system control panel are not field serviceable or replaceable. The
entire assembly, including circuit boards, bezel assembly, and labels, is available as a replaceable
part. Rotary and sliding knobs, rotary encoders for the knobs, the trackball assembly, and the
trackball cable are all available as separate parts.
System Monitor
The monitor is an RGB, 15-in FST display monitor with a 0.28-mm, or better, RGB phosphor dot
trio pitch, an internal automatic line operated degaussing coil, 50-MHz minimum video band-
width and 800 dots minimum per horizontal line. The monitor has an integrated microphone.
The monitor supports six different video formats. See “Monitor Specifications” on page 48 for a
summary of the system monitor technical specifications.
Three different color temperature settings are user selectable. The image presented is smaller
than a normal 15-in FST image, with only a portion of the phosphor region actively scanned.
I/O Panels
Input/output (I/O) panels (upper and lower) installed into the rear of the cart framing provide for
external system connections:
• Upper I/O panel (see Figure 11-12):
- A 9-pin sub-D connector serial port
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