LIFEPAK 15 Monitor/Defibrillator
Service Manual
Device Description
Functional Descriptions
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Paddles/pacer processor
The paddles/pacer processor controls all facets of noninvasive pacemaker operation and paddles ECG signal acquisition.
Inputs received serially from the A01 System PCB ASIC are translated into controls to enable noninvasive pacemaker
delivery of properly timed pacing impulses at the desired current. Analog ECG from the Paddles/QUIK-COMBO ECG
Preamplifier is processed for local use and for transfer across the isolation barrier to the A01 System PCB DSP and onto the
A01 System PCB ASIC.
Noninvasive pacemaker
The A04 Therapy PCB noninvasive pacemaker subsystem develops isolated, adjustable current, 20-millisecond (nominal),
trapezoidal transchest pacing impulses. Major components of the noninvasive pacemaker include the paddles/pacer
processor, isolated low- and high-voltage power supplies, safety monitors, output current, pulse width, and pulse shape
controls. Controls for, and status of, the noninvasive pacemaker pass serially between the paddles/pacer processor and the
A01 System PCB ASIC.
Interface PCB (A05)
The A05 Interface PCB is primarily a signal collector/distributor used to simplify the routing of cables between the front and rear
halves of the device. The majority of signals from the device rear half are consolidated into the W04 System PCB/Interface PCB
Cable and passed to the A05 Interface PCB for further distribution to front half components (for example, A09 Printer Control
Keypad, A10 Main Keypad, A11 LCD Assembly, and A12 Printer Assembly). The following active circuits reside on the A05
Interface PCB:
Audio amplifier
Combined audio output signals receive final amplification in the A05 Interface PCB Audio Amplifier prior to application to
the W17 Speaker Assembly.