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Scale System (Optional for the Procedural, Electric, and Trauma Stretchers)
Chapter 3: Theory of Operation
When the processor wakes up, it latches U10 on with the regulator_EN signal
via D3. To power down, the scale releases the regulator_EN line. U10 also has
low battery detection and signals the processor when a low battery condition is
detected.
Switching regulator U8 and associated circuitry produces -20 V DC from
VCC. The -20 V DC supply powers the display (which only draws about 1 to 3
mA).
The display P.C. board supplies power (both VCC and Vbat) to and accepts
data from the switches via connector P5. Vbat is used for enabling U10 (wakes
up the scale) while the switch returns, powered by VCC, are shifted into shift
register U4 and read by the processor in a serial format.
The display P.C. board powers and communicates with the display via
connector P1. This communication is initiated by the processor on the scale
P.C. board so the display P.C. board acts essentially as a pass through. The
display data contains 70 segments (nine seven-segment characters, three
decimal points, and four symbol segments: lb, kg, hands off, and low battery).
Five volts is supplied on pin 4 of P1 and -20 volts on pin 1.
Display Membrane Switch Panel
A display/switch assembly is used for a user interface. This unit employs
NCAP technology (a type of LCD) and displays both pounds and kilograms
simultaneously. It contains double pole membrane switches so that it can
operate on battery power and wake up the processor when any one of the
switches is pressed.
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Hill-Rom® Transport, Procedural, and Specialty Stretchers
Service Manual (144386 REV 2)
Содержание P8000
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Страница 14: ...NOTES Page xii Hill Rom Transport Procedural and Specialty Stretchers Service Manual 144386 REV 2 ...
Страница 441: ...Schematic Wiring Diagram Control Board P N 49603 ...
Страница 442: ...Schematic Wiring Diagram Electric Stretcher P N 60389 ...
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