Hitachi 61HDX98B Manual page 13

BLOCK DIAGRAM EXPLANATION
SYSTEM CONTROL AND SIGNAL PROCESSING
selection to activate AFC.
MAIN SYNC DET. = Input; This input is used for Ser-
vice OSD positioning and Auto Programming channel
detection.
PinP SYNC DET. = Input; This input is used for judge-
ment of the Slave Microprocessor to determine the AFC
Loop activity of the PinP Tuner.
MUTE (Audio): = Output; during channel change, ex-
ternal video selection with no input, power up or power
off, and loss of Vertical Blanking, the audio and video
are muted.
V.MUTE (Video): = Output; during child lock, channel
change, or power on/off, the video is muted.
POWER: = Output; when the front power button or the
remote power button is pressed, the DM-1 module noti-
fies the sub-micro. And the sub-micro. Outputs a power
on/off command to the relay driver Q-007. Outputs high
for ON and low for OFF.
OSD & OSD BLK: = Output, this is the on screen char-
acters for the Service Menu only. OSD Blk is OSD
blanking. This cleans us the video where the OSD is to
be inserted.
HV BLK: = Input; this inputs are utilized by the Micro-
processor for Service OSD positioning.
HV BLK PH: = Output; during Service Adjustment and
in the NTSC normal mode. This picture doesn't fill the
screen. The areas on the side of the picture are called
Side Panels. This can be adjusted. The HV BLK PH,
controls the timing of the side panel OSD outputs.
SIDE PANEL APL FROM 2H VIDEO PWB: = Input;
the Microprocessor receives a pulse created within the
2H video PWB. This pulse represents the timing pulse
for the Side Panel OSD production.
Blocks continued;
OSD MIX: Only the Service menu OSD is output from
the Slave Microprocessor. The Digital convergence unit
puts out OSD characters as well. This characters product
the Service Grid and other text during Digital Conver-
gence adjustments and/or Magic Focus. The two OSD
sources are received by the OSD Mix. This is comprised
of a quad Or Gate and outputs the signal to be superim-
posed upon the video signal path from the DM-1 Mod-
ule.
PinP VIDEO FROM SELECTOR IC: The video from
the PinP tuner is routed to the PinP unit and the Sub Mi-
croprocessor for Closed Caption decoding.
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