Service manual

PN 4237242C
2.1-1
2
2
INSTRUMENT DESCRIPTION
2.1 SYSTEM OVERVIEW
Description
The MD II instrument is an automated hematology analyzer and leukocyte differential
counter For In Vitro Diagnostic Use in clinical laboratories. It is contained in one unit, with
additional space needed only for the external Printer(s), the reagents, and if used, a waste
container. The MD II is marketed as four distinct instruments; the 8 parameter and 10
parameter instruments which do not generate histograms, and the 16 parameter and 18
parameter instruments which do generate histograms. The 16 and 18 parameter instruments
have additional hardware allowing them to generate histograms.
Since the MD II is housed in one unit with indistinct physical sections, it is easier to envision
it as a set of functional or logical sections. Using this concept, the description of the unit is
divided into five sections: Power Supply, System Control, Fluidics Panel, Data Acquisition
and Peripherals.
See Figure 2.1-1 for a diagram of these sections and their relationships.
Figure 2.1-1 Functional Diagram
SYSTEM CONTROL
AT MOTHERBOARD
URA CARD
DRA1 AND DRA2 CARDS
MOTOR/SOLENOID
DRIVER CARD
DATA ACQUISTION
SENSOR PREAMP
ADAPTER CARD
Hgb PREAMP CARD
VACUUM SENSOR CARD
SPAD CARD
FLUIDICS PANEL
DILUTER PANEL
PROBE WIPE/TRAVERSE
ASSEMBLY
PERISTALTIC PUMP
ASSEMBLY
SYRINGE ASSEMBLY
PERIPHERALS
FLOPPY DISK DRIVE
DISPLAY
KEYPAD
REAR PANEL INTERFACE
CONNECTORS
POWER SUPPLY
AT POWER SUPPLY
AC POWER/VACUUM
RELAY CARD
+24 V POWER SUPPLY
LINEAR POWER SUPPLY
CARD
7242001A
C