Name
Date
Designation
Prepared
JF 05.07.13
Service Manual BB 150
Index
Name
Date
Document No.
Page
File
50078923_04_CN
50 079 823
32/ 32
4.9 DISPLAY PCB OR I²C BUS CABLE REPLACEMENT
In order to change the I
2
C bus cable the exterior door must be removed and
disassembled.
In order to change the display board of the operating panel must be removed.
For this, remove the caps, loosen the screws, and remove the front panel
upwards.
4.10 SENSOR BLOCK REPLACEMENT
After completing the service tasks:
After the sensor block has been replaced and all functional tests and control
measurements have been performed, the unit MUST be restarted with the
auto-start routine.
In either case, the following steps are designed as a functional check.
The unit must be disconnected from the mains power.
The I²C bus system is self-configuring, that is, no adjustments are required.
Switch the unit on, close the glass door, prevent the unit from heating up, check
the operation of the fan.
Units equipped with thermal conductivity detectors:
•
Initiate
the
countervoltage
adjustment by activating the -auto-start- routine and
closing the glass door.
•
The fan will stop for several seconds. The adjustment process is automatic. Once
the countervoltage adjustment is complete, the fan will switch on again.
•
Manually interrupt the -auto-start- routine (the same procedure as starting the
routine).
•
Auto-zero starts automatically. Wait for the adjustment to be completed (auto-zero
LED goes out).
•
Trigger a mains reset since software version 200.
•
Use the "cal" key to perform the zero-point adjustment of the CO
2
metering circuit.
Run a test gas addition to check the metering and regulating functions with CO
2
.
Remove the gas from the unit and restart the unit with the -auto-start- routine.
