Electrical Component Functions 
SM 6-37 J007/J010/J011 
J007/J010/ 
J011 
6.7.4 DIB 
 
The DIB (Duplex Interface Board) interfaces between the duplexer and the control board. 
  The duplex unit set sensor detects whether the duplex is unit is installed correctly. The 
printer cannot be used if the duplexer is not installed. (The duplexer is not an option.) 
  The duplex cover sensor detects whether the duplex cover is closed. The printer 
cannot be used if this cover is open.