Service Adjustments - Hitachi DP05 Service Manual

Projection color television

Table of Contents

1. ASSEMBLED P.W.B ADJUSTMENT..................................................................................................................12

1-1.

Memory Initialization (NTSC, SDTV and HDTV) ....................................................................................12

1-2.

Comb Filter Operation Check ................................................................................................................15

1-3.

Audio Operation Check ..........................................................................................................................15

1-3-1. Tone Control Operation Check ....................................................................................................15

1-3-2. Perfect Volume Operation Check ................................................................................................15

1-3-3. SRS Surround Operation Check ..................................................................................................15

2. FINAL ASSEMBLY ADJUSTMENT ..................................................................................................................16

2-1.

Raster Position........................................................................................................................................16

2-2.

Vertical Size (Progressive mode)............................................................................................................16

2-3.

Horizontal Size (Progressive and HD mode) ..........................................................................................16

2-4.

Convergence Adjust (Progressive and HD mode) ..................................................................................17

*IMPORTANT

For many of the above adjustments, it is necessary to have an HDTV (1080i) signal generator, SDTV (480P) sig-

nal 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 genera-

tors is sometimes prohibitive. For this reason, we suggest the use of a set-top-box for HDTV and SDTV adjust-

ments. Usually, there is a switch on the set-top-box which enables it to output HDTV (1080i) or SDTV (480P) sig-

nals even with no input. In this case, the sync is automatically detected by the TV (at the Y-P

rear panel).