Hitachi 46W500 Training page 43

DP-3X RAINFOREST IC INFORMATION (I501)
SCP IN Pin 49
4.2 ~ 9V
CLAMP
2.2 ~ 2.8V
Black Peak
FBP IN Pin 39
Max 9V
H-AFC 5.3V
BLK 2.3V
YM/P-MUTE/BLK Pin 79
7 ~ 9V
Blanking
2.7 ~ 4V
P Mute
1.2 ~ 1.8V
Half Tone
0 ~ 0.5V Internal
YS3 Pin 2
1.5 ~ 9V
Analog RGB
SVM Mute
0 ~ 0.5V Internal
YS1 Pin 80 / YS2 Pin 1
2.9 ~ 9V
OSD SVM
Mute 1
1.1 ~ 1.7V
SVM Mute
0 ~ 0.9V Internal
Pin 49 = SCP.
Black Peak: 2.2V ~ 2.8V: This input is utilized for establishing the Black Peak stop level
used in Black Peak expansion circuit. Here the Black Peak is expanded towards Black to
increase the contrast ratio.
CLAMP: 4.2V ~ 9V: Received from the Flex Converter via connector PFC2 Pin 8. The
clamp pulse is utilized for DC restoration and blanking timing.
Pin 39 = FBP. Combination of the following.
BLK: 2.3V H-AFC: This input is received from the Horizontal Blanking (H. Blk)
signal generated in the Deflection circuit by Q706. This signal is used as a sample
pulse in the Horizontal AFC circuit, which synchronizes the Horizontal Drive signal
with the incoming Video sync signal input at pin 16. In Through Mode, pin 8.
H-AFC Fly back pulse: 5.3V ~ 9.0V Max: This input is received from the Flex
Converter and is a combination of Horizontal and Vertical blanking signals.
H Blk from the Flex Converter PFC2 Pin 7 through Q523
V Blk from the Flex Converter PFC2 Pin 6 through Q522
Used within the Rainforest for DC restoration, Pedestal level detection and Clamping
signals, such as Burst Gate Pulse.
Also, from the Mute circuit of Q528 throug D503 to force RGB mute.
Pin 79 = YM/P-MUTE/BLK. Combination of the following.
INTERNAL: 0.0V ~ 0.5V Used internal within the Rainforest IC.
HALFTONE: 1.2V ~ 1.8V: This input is received from the Microprocessor
and is used to establish the Transparency effect of OSD. This also mutes the
video in exact timing with On Screen Display pulses (OSD). Half Tone from
the Microprocessor Pin 22 through Q415.
P MUTE: 2.7V ~ 4V: Not Used.
BLANKING: 7V ~ 9V: Not Used.
Pin 2 = YS3. Combination of the following.
INTERNAL: 0.0V ~ 0.5V Used internal within the Rainforest IC.
ANALOG RGB: 1.5V ~ 9V: This input is received from the Digital
Convergence Unit anytime the DCU is outputting graphics. During the
time this pulse is above 1.5V, the Velocity Modulation drive signal is
muted, so VM is turned off.
Pin 80 & 1 = YS2/3. Combination of the following.
INTERNAL: 0.0V ~ 0.5V Used internal within the Rainforest IC.
SVM MUTE: 1.1V ~ 7V: Halftone This input is received from the
Microprocessor Pin 22. During the time this pulse is between 1.1~1.7V,
the Velocity Modulation drive signal is muted, so VM is turned off.
OSD SVM: 2.9V ~ 9V: OSD Blk, received from the Microprocessor Pin
21. This mutes the video signal in sequence with the location and timing
of the OSD Characters.
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