HACH LANGE sc200 Manuel D'utilisation De Base page 28

Problem
Display is lit but shows no characters or
characters are faint or blurry.
Controller will not power up, or powers up
intermittently
Network or sensor module not recognized
Sensor not recognized
Note: Example of possible display message: ****
Device Missing error message appears
28 English
Resolution
Adjust the display contrast
Make sure protective film has been removed from display.
Clean the outside of the controller, including the display screen.
Make sure the AC power connections are properly terminated in
the controller.
Make sure the power strip, line power, wall plug are all properly
plugged in.
Contact Technical Support
Make sure the module is properly installed.
Make sure the module selector switch is set to the proper
number.
Remove sensor module and install the module into the second
analog slot. Apply power to the controller and allow the controller
to perform a device scan.
Contact Technical Support.
If the sensor is an analog sensor and a corresponding module is
installed in the controller, refer to the instructions supplied with
the Network or Sensor Module.
Make sure the digital connector wiring harness is seated on the
inside of the door assembly and that the wiring harness is not
damaged.
If the digital sensor is connected to the controller with a digital
termination box, user supplied junction box, digital extension
cables, or a user-supplied extension cable, connect the sensor
directly to the controller and perform a device scan. If the
controller recognizes the sensor, check that all the wiring in the
junction boxes or extension cables is correct.
Make sure that only two sensors are installed in the controller.
Although two analog module ports are available, if a digital
sensor and two analog modules are installed, only two of the
three devices will be seen by the controller.
Contact Technical Support
Perform a Device Scan from the Test/Maintenance menu.
Power cycle the controller