4535 612 10261 HD11 Service Manual Page 66
CSIP Level 1 Theory of Operation: Functional Description
• Test Points: All DC voltages are accessible for measurement via external, impedance-pro-
tected connectors located on the top rear of the power supply, above the LEDs.
PC Power Supply
The PC has its own power supply, which receives mains AC power from the system power sup-
ply. It is a typical modern PC power supply that establishes four output voltages (+5 Vdc, –5 Vdc,
+12 Vdc, –12 Vdc) and one “power good” status output in support of the PC electronics.
Power Distribution
System power distribution diagrams are shown in Figure 11-2 and Figure 11-3. The system
power supply output voltages and purpose are listed in Tab l e 4 - 1.
• The system power supply sources +2 V, +2.5 V, +3.3 V, ±5 V, ±12 V, ± HV, ± 100 V, +5 C and
+11 C to the Backplane Board, which distributes ±HV, ±100 V, +5 C and +11 C to the Signal
Distribution Board. The Signal Distribution Board delivers these voltages to the Transducer
Connector modules.
• The ±HV goes from the power supply through the backplane board (where it receives addi-
tional filtering and regulation) to the TR board.
• The Signal Distribution Board delivers transmit pulses and controls from the TR boards to
the transducer connector modules and returns signals and status from the transducer con-
nector modules to the TR boards.
• A USB cable that provides power for the QWERTY keyboard, trackball, and the Enter and
Select keys
• An auxiliary cable that provides power for the rest of the keyboard keys, the backlighting,
and the amplifier for the speakers
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