CareFusion IVAC P6000, Technical & Service Manual

Page: 42 / 106

Circuit Descriptions
P7000, P6000, TIVA, TCI & TIVA 42/106 1000SM00012 Issue 8
Control PCB (continued)

LCD Display Drive
The LCD display is located on the Display PCB; data is passed using the data bus to a graphics controller located on
the Display PCB.

Visual Indicators
The AC battery, start and stop LEDs are mounted on stand-off's on the Control PCB. The AC LED is driven directly from
the Power Supply PCB via a connection at PL6. The battery, start and stop LEDs are driven by the microcontroller via
IC15.

Syringe Size Measurement
A linear potentiometer mounted in the upper case detects the movement of the syringe clamp shaft. The linear
potentiometer is configured as a potential divider and produces a signal relative to the syringe diameter. The signal
from the potentiometer is fed into one of the ADC inputs of the microcontroller.
Display PCB
The Display PCB is located in the upper case assembly of the pump. For the purposes of maintenance and repair the
Display PCB is supplied as a complete module.
Flexible Circuits
Two flexible circuits are used to connect the motor, opto switches and declutch micro switch on the transmission to the
Control PCB. The motor optos and power connections are made via PL12, the plunger detect opto and declutch micro
switch are connected via PL5.

Motor Optical Encoders
Two slotted optical switches are mounted on the back of the motor/gearbox assembly to detect the speed and
direction of rotation. The optical switches are activated by a flag mounted on the rear output shaft of the motor.

Declutch Microswitch
A microswitch, SW1, is mounted on the transmission carriage to detect when the transmission drive has been
disengaged.

Plunger Detect Optical Switch
A slotted optical switch is mounted inside the plunger holder. The optical switch detects when a syringe plunger is
correctly located in the plunger holder.
Interfaces

TCI Interface (Model TCI & TIVA only)
The interface PCB is located in the lower case and connects the TCI Diprifusor module into the RS232 communications
port. The TCI Diprifusor module aerial lead connects directly to the aerial coil and a screened cable passes up to the
TCI aerial mounted in the upper case.

RS232/Nursecall
These circuits are incorporated on the Control PCB. See also 'Mark I Hardware' below.
Power Supply PCB
WARNING: THE PUMP POWER SUPPLY HAS HIGH VOLTAGES ON THE EXPOSED SURFACES OF THE BOARD. THE PUMP MUST
ONLY BE SERVICED BY QUALIFIED PERSONNEL USING THE RECOMMENDED EQUIPMENT.
The switched mode PSU used in the pump accepts an input voltage from 93V to 264V AC and generates two DC outputs
that are used to power the system. The first output is rated at 7V 300mA and is used to charge the lead acid battery. The
second output is rated at 7V 1.5A and is used to power the Motor, Display PCB, Control PCB and Interface PCB.

Audible Alarm
The main audible alarm is located on the Power Supply PCB and can be enabled either by the audible alarm drive, or
the watchdog alarm signal.
Mark I Hardware

Mains On/Off Switch
Mechanical ON/OFF switch, located on the side of the pump.

RS232/Nursecall
Interface PCB, fitted with the isolated RS232 and Nurse Call circuits.
Module Overview Functional Description (continued)