4.11 Main Board Replacement - Thermo Scientific BB 150 User Manual

4.11 MAIN BOARD REPLACEMENT

After completing the service tasks:
After the main board has been replaced and all functional tests and control
measurements have been performed, the unit MUST be restarted with the
auto-start routine.
The unit must be disconnected from the mains power.
Replace the PCB.
The PC bus lines can be connected to the sockets in any desired order.
After installation, switch the unit on.
Press and hold down the -cal- key.
This will reset any -cal- adjustments that may have been performed.
The unit is now operating with its original specified adjustment values.
In units equipped with copper interior fittings, set the door factor in FL 8. Refer to
Section 4.5, Control and Regulating System Configuration.
The replacement PCB is set up for units with stainless steel interior fittings. (Door
factor for copper interior fittings 2.2).
Test the unit's control and regulating functions:
Allow the unit to heat up to, for example, 37.0°C.
-
Once the unit reaches the specified temperature, use the -cal- key to perform
-
the zero-point adjustment of the CO
Run a test gas addition to check the metering and regulating functions.
-
Remove the gas from the unit and restart the unit with the -auto-start- routine.
Name
Prepared
Index Name
50078923_04_CN
File
Date
JF 05.07.13
Date
metering circuit.
2
Designation
Service Manual BB 150
Document No.
50 079 823
Page
33/ 33