Philips L04A AB Service Manual Download Page 79

Page: 79 / 90

Circuit Descriptions, List of Abbreviations, and IC Data Sheets

9.5.2

Option Settings

The option settings for the Tuner type can be found in Option
setting 1 of the SAM mode. The Option settings for Option 1 are
as follows:
•

Option Byte 1
–

Bit 7: OP_PHILIPS_TUNER

–

Bit 6: OP_FM_RADIO

–

Bit 5: OP_LNA

–

Bit 4: OP_BLUEMUTE

–

Bit 3: OP_ACI

–

Bit 2: OP_UK_PNP

–

Bit 1: OP_VIRGIN_MODE

–

Bit 0: OP_CHINA

For more details on the option settings, please refer to the
chapter 8 “Alignments”.

9.6

Source Select

For this chassis, the audio/video source selection is controlled
via the Hercules.
The Audio/Video Source Select is one of the more complex
functions due to its diversity and complex switching. The Audio/
Video Source Select comprises of the following components:
•

The Hercules itself for Mono Audio and Video Source
Selection.

•

The HEF switch for Stereo Audio as well as Video
Selection.

9.6.1

Options

The option settings for the Source Selection can be found in
Option settings of the SAM mode. The Option settings for
Option 5 are as follows:
•

Option Byte 5
–

Bit 7: OP_AV1

–

Bit 6: OP_AV2

–

Bit 5: OP_AV3

–

Bit 4: OP_CVI

–

Bit 3: OP_SVHS2

–

Bit 2: OP_YPbPr

–

Bit 1: OP_NTSC_PLAYBACK

–

Bit 0:

For more detail on the option settings, please refer to the
chapter 8 “Alignments”.

9.6.2

Audio Source Selection

The signals coming out of the DEMDEC (internal demodulator/
decoder block of the Hercules) are selectable and consist of
the following (depending on the transmission):
•

DEC L/R (Can be NICAM, FM 2CS, or BTSC Stereo).

•

Mono (Refers to fallback/forced Mono in Stereo
Transmission).

•

SAP.

For L04, the assigned I/O with respect to the Hercules is as
follows:
•

AV1 Input assigned to

Audio In 5

•

AV2 Input assigned to

Audio In 3

•

Side AV Input assigned to

Audio In 4

•

External Interface Input assigned

to Audio In 2

•

Monitor Output assigned to

SCART Output (S)

•

SCART2 Output (EU) or Monitor Output (LA/NA/AP)
assigned to

Headphone Output (HP)

•

Main Output assigned to

Loudspeaker Output (LS)

9.6.3

Video Source Selection

Video source selection is done inside the Hercules. Therefore
it provides a video switch with 3 external CVBS inputs and a

CVBS output. All CVBS inputs can be used as Y-input for Y/C
signals. However, only 2 Y/C sources can be selected because
the circuit has 2 chroma inputs.

9.7

Video Processing

The Video Processor is basically the Hercules. Video
processing is done such as the Brightness Control, Contrast
Control and so on.

Some features:
•

Full YUV-loop interface (alternative functions: DVD, RGB
or Y/C).

•

Double window implementation.

•

Linear / non linear scaling for 16:9 sets.

•

Tint (hue) on UV signals (including DVD).

•

Peaking, Coring, Black \ Blue \ White-stretch.

•

Transfer-Ratio and Scavem (also on TXT).

9.7.1

Features

The features included in the Hercules are as follows:
•

Brightness Control.

•

Contrast Control.

•

Saturation Control.

•

Sharpness Control.

•

Peak White Limiter.

•

Beam Current Limiter.

•

Black Stretch (Contrast Plus).

9.7.2

Block Diagram

Following diagram is the block diagram of the video processing
part:

Figure 9-6 Video processing block diagram

9.7.3

Options

The option settings allow for process of the video as per set
specification. The option settings can be found in “Option 2”
and “Option 6” in the SAM mode. The option settings are as
follows:
•

Option Byte 2
–

Bit 7: OP_SC

–

Bit 6 :OP_GREEN_UI

–

Bit 5: OP_CHANNEL_NAMING,

–

Bit 4: OP_LTI,

–

Bit 3: OP_TILT,

–

Bit 2: OP_FINE_TUNING