SECTION 8 
MAINTENANCE AND INSPECTION 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8.1  ROUTINE MAINTENANCE ..................................................8-1 
8.2  MAINTENANCE ON EACH UNIT.........................................8-2 
8.2.1    Scanner Unit NKE-2043/2062/2063A/2103/2254 .........8-2 
8.2.2    Display Unit NCD-4380 .................................................8-5
8.3  PERFORMANCE CHECK ....................................................8-7
8.3.1    Test Menu ......................................................................8-8
8.3.1.1    Self-diagnosis function .....................................8-9 
8.3.1.2    Monitor Test ...................................................... 8-11 
8.3.1.3    Operation Panel Test ...................................... 8-12 
8.3.1.4    MON Display .................................................... 8-14 
8.3.1.5    Alarm Logging ................................................. 8-16 
8.3.1.6    System INFO .................................................... 8-19 
8.3.1.7    MAGI ................................................................. 8-20 
8.3.2    Line Monitor ............................................................... 8-21 
8.3.3    GPS Reception Status Display (GPS Status) .......... 8-23
8.4  REPLACEMENT OF MAJOR PARTS ............................... 8-25
8.4.1    Parts Expected for Periodic Replacement .............. 8-27 
8.4.2    Replacement of magnetron ...................................... 8-27 
8.4.3    Motor Replacement ................................................... 8-49 
8.4.4    Replacement of Diode Limiter (A102/A303) ............ 8-63 
8.4.5    Replacement of Backup Battery .............................. 8-64