LIFEPAK 15 Monitor/Defibrillator
Service Manual
Device Description
Functional Descriptions
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System PCB (A01)
The A01 System PCB integrates and controls all functions of the device. There are two primary components:
Single-Board Computer (SBC)
The single board computer (SBC) functions as the central processing unit (CPU) for intensive number-processing tasks.
Field-Programmable Gate Array (FPGA) and Application-Specific Integrated Circuit (ASIC)
The field-programmable gate array (FPGA) and application-specific integrated circuit (ASIC) operate as the interface
between the CPU and all other therapeutic, monitoring, data management, and display device subsystems.
The following items identify the major subsystems of the A01 System PCB and their basic functions.
Power supplies
The A01 System PCB uses SW_VB (switched battery voltage) from the A03 Power PCB (via the A04 Therapy PCB) to
originate six power supplies for use throughout the device as follows:
~ +1.5 V power for use on the FPGA.
~ +1.8 V power for use on the SBC.
~ +5 V logic power for use on the A01 System PCB within the DUART, RTC, ASIC, and audio subsystems, and the A04
Therapy PCB.
~ +3.3 V logic power for use on the A01 System PCB within the SBC and FPGA CPUs, DSP, main, and ASIC
subsystems.
~ ±12 V analog power for use on the A01 System PCB and A04 Therapy PCB.
~ +24 V power for use in the A01 System PCB printer subsystem.
ECG front end
The device simultaneously captures inputs from up to 10 independent patient-connected leads for use in the interpretive
12-lead algorithm and ECG waveform display. The ECG front end performs the functions of patient isolation, electrostatic
discharge and defibrillation protection, lead selection, baseline dc restore, bandwidth filtering, internal pacemaker
