NEC DPro2070SB Service Manual page 5

1.7.6 Short-circuit protection circuit on secondary power side .................................... 1-23
1.7.7 Overvoltage protection circuit .................................................................................. 1-23
1.8 Adjustment ............................................................................................................................ 1-24
1.8.1 Adjustment mode ....................................................................................................... 1-24
1.8.2 User mode (Normal mode) ....................................................................................... 1-24
1.8.3 Factory mode .............................................................................................................. 1-27
1.8.3.1 How to entering to Factory mode .............................................................. 1-27
1.8.3.2 How to cancel Factory mode ..................................................................... 1-27
1.8.3.3 How to enter FACTORY-HV mode ............................................................ 1-27
2. Adjustment procedure ................................................................................................................... 2-1
2.1 Measuring instruments ....................................................................................................... 2-1
2.2 Preparatory inspections ..................................................................................................... 2-1
2.3 Names of each monitor part .............................................................................................. 2-2
2.3.1 Configuration of front control panel ....................................................................... 2-2
2.3.2 Configuration of rear input connector (signal input) ........................................... 2-2
2.3.3 OSM display matrix .................................................................................................. 2-3
2.3.3.1 User mode ................................................................................................... 2-3
2.3.3.2 Factory mode .............................................................................................. 2-4
2.4 Adjustment ........................................................................................................................... 2-7
2.4.1 How to select the factory adjustment (FACTORY) mode ................................... 2-7
2.4.1.1 Selecting with front panel switches ......................................................... 2-7
2.4.2 Adjustments before aging ........................................................................................ 2-7
2.4.2.1 Adjusting the high voltage and high voltage protector ......................... 2-7
2.4.2.2 FOCUS adjustment (Rough adjustment) ................................................ 2-8
2.4.2.3 Shock test .................................................................................................... 2-8
2.4.2.4 Preadjustment before aging ...................................................................... 2-8
2.4.2.5 Adjusting the landing (ITC/4 corner purity adjustment) ........................ 2-9
2.4.3 Adjusting the picture size, position and distortion, DBF amplitude and phase 2-9
2.4.3.1 Adjusting the picture inclination ............................................................... 2-9
2.4.3.2 Adjusting the back raster position ........................................................... 2-9
2.4.3.3 Adjusting the left/right distortion, picture width, picture position (LEFT/
2.4.3.4 Adjusting the DBF amplitude and phase ................................................ 2-10
2.4.4 Adjusting the cut off ................................................................................................. 2-11
2.4.4.1 Adjusting BTCEN (BRIGHT-CENT), BTMAX (BRIGHT-MAX) and BS1
2.4.4.2 Adjusting BS2 (BIAS-M) / BS3 (BIAS-L) .................................................. 2-12
2.4.5 Setting CONSTANT BRIGHTNESS circuit (Factory mode) ................................ 2-13
2.4.5.1 Reading beam current default data ......................................................... 2-13
2.4.5.2 Confirming CONSTANT BRIGHTNESS function ................................... 2-13
RIGHT) and vertical linearity (all preset) ................................................ 2-10
(BIAS-H) ....................................................................................................... 2-11
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