Hitachi DV-P505E, Service Manual

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8 Chapter 1
Under control of output voltage by DAC pins (25, 33, 34 pins), it output 3 kinds of ANALOG VIDEO
SIGNALS:
1.
ANALOG COMPOSITE VIDEO SIGNALS (CVBS/32 pin), output voltage 1.0Vpp.
2. ANALOG S VIDEO by ANALOG LUMINANCE SINGLES (Y/27 pin), output voltage 1.0Vpp and ANALOG
CHROMA SIGNALS (C/26 pin), BURST part output voltage 286mVpp.
3.
ANALOG COMPONENT YP
B
P
R
/RGB.
S2 Processing Circuit (only for Japan)
S2 is a standard used in wide television sets possessing screen size switching function in NTSC mode. By
inputting VIDEO signals formed by superposing DC voltage on C signal at S input terminal, it switches
automatically to TV display size. The DC voltage superposed on C signal varies according to the ASPECT
RATIO of VIDEO SIGNALS.
1. Case of SQUEEZE SIGNAL (*1)
H-level voltage is input in SQUEEZE INPUT; Q2212 and Q2213 are powered and +4V DC voltage is superposed
on C signal output line.
2. Case of LETTER BOX SIGNAL (*2)
H-level voltage is input in LETTER INPUT; Q2209, Q2210, and Q2211 are powered and +1.8V DC voltage is
superposed on C signal output line.
1. *1: It is a laterally shrunk image information with 525 lines and an aspect ratio of 16:9 carried by the
standard TV signal format of 525 lines and an aspect ratio of 4:3. When viewing on a 4:3 TV set, the image
appears vertically oblong.
2. *2: It is a wide screen signal in the standard TV signal format of 525 lines and an aspect ratio of 4:3 with
coexistence of upper and lower blank areas of 525 lines and an aspect ratio of 4:3 screen and the
principal image area of 4:3 aspect ratio (line 53~232/316~495). When viewing on a 4:3 TV set, one sees
black areas at the top and bottom of the screen.