TO GO TO AN ADJUSTMENT, CLICK ON ITS HEADING BELOW
1. ASSEMBLED P.W.B ADJUSTMENT..................................................................................................................30
1-1.
1-2.
Comb Filter Operation Check ................................................................................................................35
1-3.
Video Settings Check..............................................................................................................................35
1-3-1. Perfect Picture Check ..................................................................................................................35
1-3-2. Auto Color Check..........................................................................................................................35
1-3-3. Noise Reduction Check ................................................................................................................35
1-4.
High Voltage Adjustment ........................................................................................................................36
2-1.
Cut Off Adjustment..................................................................................................................................36
2-2.
DCU Phase Data Setting ......................................................................................................................36
2-3.
2-4.
Raster Tilt (Deflection Yoke) ....................................................................................................................37
2-5.
Beam Alignment......................................................................................................................................37
2-6.
Raster Position ........................................................................................................................................38
2-7.
Vertical Size ..........................................................................................................................................38
2-8.
Horizontal Size ......................................................................................................................................38
2-9.
Beam Form ............................................................................................................................................39
2-10. Lens Focus..............................................................................................................................................39
2-11. Static Focus ............................................................................................................................................41
2-12. Digital Convergence ..............................................................................................................................41
2-13. Blue Defocus ..........................................................................................................................................47
2-14. White Balance ........................................................................................................................................47
2-15. Sub Brightness........................................................................................................................................48
2-17. Horizontal Position ................................................................................................................................51
2-18. Scanning Area Check ............................................................................................................................51
2-19. Raster Distortion Check ........................................................................................................................52
3. ADJUSTMENT POINT ........................................................................................................................................54
3-1.
Signal Block Assembly............................................................................................................................55
3-2.
3-3.
Power Supply P.W.B. ..............................................................................................................................57
3-4.
CPT (R)(G)(B), Focus Pack ....................................................................................................................58
3-5.
Control P.W.B. ........................................................................................................................................59
*IMPORTANT
For many of the above adjustments, it is necessary to have an HDTV (1080i or 720P) signal generator, SDTV (480P)
signal generator, as well as the usual NTSC (480i) signal generator.
Hitachi recognizes that few companies offer HDTV or SDTV signal generators and that the cost of these
generators is sometimes prohibitive. For this reason, we suggest the use of a set-top-box for HDTV and SDTV
adjustments. Usually, there is a switch on the set-top-box which enables it to output HDTV (1080i or 720P) or
SDTV (480P) signals even with no input. In this case, the sync is automatically detected by the TV (at the Y-P
Inputs on the rear panel).
SERVICE ADJUSTMENTS
29
29
DP27/27D
P
B
R