Specifications

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3BUS 208 000 R1301 235Troubleshooting
Diagnostics Performed at the Sensor
Reference Figure 11-4 and Figure 11-5.
The Sensor Electrical Interconnect board (SEI) is a printed circuit board used in
basis weight and ash source and detector modules. The SEI distributes signals and
power to the proper connectors. It contains the sensor diagnostics plug which allows
external access to internal signals for troubleshooting. Electrical ORUs have cables
or plugs that interface to this board. The air solenoids, PTC module, and the CAP
thermistor make connections to this board in the source module. The Gap sensor
printed circuit board, ELHV board, PTC power and CAP thermistor all plug into
this board in the detector module.
The diagnostic access port is the cover located in the sensor module housing
allowing external access to the diagnostic connector located on the SEI. Head
package sheet guides may have to be removed to gain access to this panel.
The sensor diagnostic plug is a 37-pin connector designed to accept the diagnostic
tool typically used to troubleshoot Smart Platforms and Smart Processing Centers.
This diagnostic access is important for STLK-11 and STLP-3 sensors since it is
impossible to gain internal access to powered up assemblies. Side plate access to
internal assemblies does not exist. Sensor power is automatically disconnected
through the connector if internal access is required.
There are three Light Emitting Diodes (LEDs) on the SEI board. The LEDs indicate
the shutter status, internal check sample and PTC heater assembly on the source
module. On the detector module the status of the PTC heater assembly is indicated,
the other two lights are not used. They can be viewed through acrylic windows at
the end of the sensor housing. Removal of the sheet guides may be necessary for
clear viewing of the LEDs.
Figure 11-4 Basis Weight Source Module
Diagnostic
Access
Port
Diagnostic
LEDs
Diagnostic Plug
Electrical
Interconnect
Board
Air Solenoid
PTC Heater
Module
CAP