CASMED 740 Service Manual
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Contents
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CASMED 740 MONITOR SERVICE MANUAL21-02-0174 REV. 02 05/0867+3.3V TP2 Chip I/O supply voltage for the DSP Controller (U20).The +5 volts output of the switching regulator (U1) goes into a voltage regulator (U2) to supplythe +3.3 volts.+2.5V TP3 Core operating voltage for the DSP Controller (U20).The +5 volts output of the switching regulator (U1) goes into a voltage regulator (U3) to supplythe +2.5 volts.+5V_ISO1 TP20 Isolated power supply for the Temperature Module circuit.The +5 volts output of the switching regulator (U1) goes into a dc-dc converter (U17) to supply+5 volts to the Temperature Module circuit. The converter provides an isolation voltage of2.5KV. The dc-dc converter is turned on and off by the DSP controller (U20) and transistor(Q12).+5V_ISO2 TP8 Isolated power supply for the SpO 2 circuit.The +5 volts output of the switching regulator (U1) goes into a dc-dc converter (U9) to supply +7volts. The converter provides an isolation voltage of 2.5KV. The dc-dc converter is turned onand off by the DSP controller (U20) and transistor (Q7). The output of the converter feeds a +5volt regulator (U22) that provides voltage for the SpO2 board.+5VCRG TP6 Power supply for the Battery Charger.The DC input goes into a voltage regulator (U7) to supply the +5 volts.+VND TP4 Power supply for the Blood Pressure pump.The DC input or the Battery input, if there is no DC present, goes into a voltage regulator (U27)to supply the +6 volts. The voltage regulator is turned on and off by the DSP controller (U20)and transistors (Q16 and Q17).BATTERY CHARGERThe battery charging is controlled by U8.SUPERVISOR MICROCONTROLLERThe Microchip PIC16F73 (U5) is the supervisor of the Main Control Board. The controller has4K of program flash, 192 bytes of data memory and operates from an external 153.6KHzcrystal. The Microcontroller has 22 I/O’s, 3 timers, 2 PWM/capture/compare modules, UART,SPI, and five (5) 8bit analog-to-digital channels.Indicator LED’sLED1 is the power/low battery/charging indicator that is controlled by an output port of theMicrocontroller (U5).Temperature Monitoring (SureTemp®)The Temperature module is an option that is plugged into J8 and J9 of the Main Control Board.The isolated power supply for the Temperature Module circuit (+5V_ISO1) is controlled by anoutput pin of the Supervisor (U5 pin 28). The Module is read by the Supervisor (U5) thru theserial port. The Temperature information is then sent to the DSP (U20) thru the SPI port. |
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