Service manual

Section - VII Reagent Module BT3000 PLUS Rev. 0, Soft Ver. 8 Page 3 of 6
7-3. REAGENT PLATE CONTROLLER - 15-04313-03
(OBSOLETE
- used on Analyzers up to June 2004)
This module designed for reagent plate management is housed in an easily removable metallic
container. The electronic devices on this board have the following functions:
a) Reagent plate drive motor control.
b) Zero position sensor control.
c) Reagent plate temperature control.
d) Barcode reading and interface.
This module is located on the rear of the reagent chamber and is easily accessible for service or
repair through the small panel on the rear of the analyzer.
The Reagents Plate Controller Module (15-04313-03) is controlled by µC87LPC764. This micro-
controller manages the stepper motor through two opto-couplers, U3 & U4, which isolates the
power driver A1 from the digital circuit.
The µC764 receives signals from the barcode module through the U5 chip (Max 232). The
reagents chamber temperature is controlled through a U6A comparator and the Q1 transistor. The
control temperature is fixed at about 5°C by using the remote control of the power supply (Lambda
Alpha 400W). The J2 connector connects the power supply to the controller circuit of the reagent
plate. The Q2 transistor functions as a switch to interrupt power supply to the Peltiers through the
µC764 (pin 14) whenever requested by the software. The circuit for the control of the Peltier
voltages has an additional function of interrupting power to the refrigeration system in case the
temperature inside the reagents chamber exceeds 40°C. The circuit, which generates this
function, consists of a U6B comparator and an U7 opto-coupler. The Hall sensor (zero position),
temperature sensor, and the Peltier modules are all located under the reagent chamber.
7-4. REAGENT REFRIGERATION SYSTEM
The reagents refrigeration system comprises reagents chamber, refrigeration module with
the Peltier modules, conductive spacers, and heat sink, along with the reagent pulley
drive assembly.
Peltier Modules
Refrigerator
Interface Board
Heat Sink
Terminals
Soldering
Details
Insulation
Block
Reagent Refrigeration Module
Figure 7-1