ZOLL Base Powercharger 4x4, Service Manual

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FUNCTIONAL DESCRIPTION
IV-3
Standard Terms and Abbreviations
CV Constant Voltage. Term applies to the type of charging technique used
to charge a battery where a Constant Voltage is applied to the battery.
CC Constant Current. Term applies to the type of charging technique used
to charge a battery where a Constant Current is applied to the battery.
Main PCB Refers to the electronics assembly which controls the voltage and
current being supplied to the Battery Pack (PD4410).
Embedded A software programmable device used to sense and process a series of
Processor input signals to produce control/status output signals.
LED Light Emitting Diode.
Micro- A software programmable device used to sense and process a series of
processor input signals to produce control/status output signals.
mS Milliseconds.
PCB Printed circuit board.
PD1400 This term refers to the any of the PD1400/1600/2000 Pacemaker/
Defibrillator family of products that are compatible with the Base
PowerCharger
4x4
.
µ
S Microseconds.
2. COMMON CIRCUITRY DESCRIPTION
As shown in the attached Block Diagram each charger compartment operates
independently from the others except that all four compartments share a common DC
power bus, VCC power supply, voltage references and temperature measurement
circuitry. The occurrence of a fault condition in one of the common circuit areas may
cause all four charging compartments to suspend operation.
In the following sections there will be periodic reference to a device's reference
designation and pin number. For example, U3.5 will refer to pin number 5 of device U3.
This information is to be associated with the attached system diagram and schematic set.
In a similar fashion there will be reference to the microprocessor's port designation. For
example, P3.1 will refer to the microprocessor's bit 1 of I/O port 3. Refer to the 8051
Data Handbook for a detailed description of the 87C752 I/O port capabilities and other
features.