Test Results

3.3.2.2 Adult Defaults and Alarm Limit Ranges 3.3.2.3 Neonate Defaults and Alarm Limit Ranges 3.3.3 Hardware and Software Tests 3.3.3.1 Operation with a Pulse Oximeter Tester I certify that the monitor listed in this form has successfully passed all of these tests. Technician _Date _ I certify that the above signed technician has performed the tests listed on this form and the monitor performs satisfactorily. 4.4 Replacement Level Supported 4.5 Obtaining Replacement Parts This section explains...

601

Category 7 Watchdog-Timer Errors Error in the watchdog-timer circuit of the CPU (main PCB). Likely action is replacement of the CPU. Error in the printer. If a printer error condition occurs, the display reads Pr Err. See the Troubleshooting section for further information on this error. 5.3 N-20PA Disassembly Procedure The device can be disassembled down to all major component parts, including chassis enclosures Tools required small, Philips-head screwdriver small flat-head screwdriver WARNING...

24

Figure 5-4 Printer and Flex Circuit Assembly Figure 5-4 shows how to disassemble the printer and flex circuitry. 1. Remove the printer button stiffener (37). 2. Disconnect the two flex-circuit headers of the printer (29) from the connectors on the printer flex circuit (28) by slowly pulling them outward from side to side at alternating ends of the connectors. 3. Remove the printer button strip (7) from the printer flex-circuit. 4. Remove the printer flex-circuit insulator (24). 5. Remove the...

74hc573

U16 is the input port external to the CPU. The logic levels on the inputs (pins D1-D8) are output to the CPU via the AD bus while EXINEN is strobed low. All of the user control buttons are input via U16. Also, the battery type is senses via U16 a high on signal BAT_TYPE signifies to the CPU that rechargeable batteries are being used. If the optional printer head is in the home position, PR_HOME will be a logic high. Pin D8 (RTC_IO) and an output bit of the external output port are connected....

Test

The unit operates on disposable batteries. Battery type input is digital a high input informs the CPU that rechargeable batteries are in use. If rechargeable batteries are used, the battery and the VRECHARGE terminals are mechanically connected. This applies the battery voltage to VRECHARGE, pulling BAT_TYPE high. R100 and CR27 are a current-limiting resistor and a voltage-clamping diode that are used to protect the input port from excessive battery voltage. If disposable batteries are used,...

21

(This page intentionally left blank) 3.2 Required Tools and Equipment This section describes performance verification and safety testing for the Nellcor N-20PA pulse oximeter (monitor) and all options, following troubleshooting and repairs. The tests can be performed without removing the monitor cover. All tests except Battery Operation must be performed before the monitor is returned to the user. If the monitor fails to perform as specified in any test, repairs must correct the discrepancy...

85 Physical

8.5.1 Weight with batteries installed 19.0 cm high x 7.6 cm wide X 6.35 cm deep 7.5 in. x 3.0 in. x 2.5 in. This page intentionally left blank 9-1 Introduction 9-2 Functional Overview 9-3 Definition of Terms 9-4 Overall Block Diagram 9-5 SpO2 Analog Circuitry 9-6 Digital Circuitry 9-7 Circuitry Illustrations This Technical Supplement provides the reader with a discussion of the N-20PA circuits. This discussion is supported with applicable illustrations, including graphics that have been placed...

97 Circuit Illustrations

Circuits Diagram Oximeter Multisim

The foldout graphics referenced throughout the Technical Supplement text are as follows Figure 9-10 N-20PA HSO Timing Diagram Figure 9-13 AC Variable Gain Control Circuit Figure 9-23 Display Control Circuit Figure 9-32 Printer Interface Circuit Figure 9-34 N-20PA Main PCB Schematic Diagram Figure 9-35 N-20PA Auxiliary PCB Schematic Diagram Figure 9-36 N-20PA Flex Circuit Schematic Diagram This page intentionally left blank Figure 9-10 N-20PA HSO Timing Diagram Figure 9-13 AC Variable Gain...

93 Definition Of Terms

The CPU has a 10-bit A D converter on board. Up to eight different analog inputs can be provided to the A D converter for measurement. Central Processing Unit CPU . An Intel 80C196KC 16-bit microcontroller. The CPU sends and receives control signals to the SpO2 analog section, display, and optional printer. Content Addressable Memory CAM . The CPU controls the HSO lines with the CAM. CAM is controlled by software and programmed with events scheduled relative to...

N20PA Portable Pulse Oximeter

Caution Federal law U.S.A. restricts this device to sale by or on the order of a physician. To contact Mallinckrodts representative In the United States, call 1.800.635.5267 or 314.654.2000 outside the United States, call your local Mallinckrodt representative. 2001 Mallinckrodt Inc. All Rights reserved. 062153C-0701 Nellcor Puritan Bennett Inc. 4280 Hacienda Drive Pleasanton, CA 94588 USA Telephone Toll Free 1.800.NELLCOR