Sartorius MC 5, Руководство по обслуживанию, Страница: 35 / 49

Stand 1/94 SARTORIUS MC 5 Balance 35
MC 5
Electronics:
The microbalance’s electronics consist of 9 printed-circuit
boards (PCBs) that have various functions depending on the
type of components mounted:
1. The main PCB contains the following:
Power supply, microcomputer, motor control subassembly,
menu switch and EEPROM IC106 for: menu functions,
adjustment, calibration, linearization, vibration filter settings,
temperature compensation for drift (creep), and codes relevant
to manufacturing operations.
To exchange this board, see item 4 of this section.
2. The following components are mounted on the analog PCB:
low-pass filter, temperature-compensating circuit, reference
voltage circuit, and the A / D converter, including the EEPROM
IC208 with the components for temperature compensation and
the temperature-compensating sensor.
To exchange this board, see item 4 of this section.
3. Located on the system PCB is an amplifier circuit for the null
indicator and the temperature sensor as well as the system
EEPROM IC107 with the serial number of the microbalance.
To exchange this board, see item 4 of this section.
Important Note:
4. Before exchanging a PCB mentioned in items 1-3, make sure to
save all EEPROM data by downloading them onto a PSION
server, PC or laptop!
5. The RS-232 port driver is on the data output PCB.
6. Photoelectric barriers are mounted on the servomotor PCB for
the internal weight and the draft shield PCB.
7. One transmitter diode and two receiver diodes are located on
the null indicator PCB.
8. The multicontact connectors listed below are mounted on the
system connector PCB:
A 20-pin connector is routed from the null indicator/interface
PCB, connector St. 22/23. (The connectors are abbreviated in
German as „St.“ below):
St.21 25-pin To computing (display) unit
St.28 10-pin To null indicator/system PCB
St.27 7-pin To weight servomotor PCB
St.29 9-pin To draft shield PCB
Display Module: Similar to the MC1 technology on RC models; with numeric key functions from 0...9.