Sony TRINITRON PVM-1271Q Service Manual page 2

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i /
CMPTR connector (25-pin)
Pin assignment
Pin No ■
Signal
Signal level -
IBM select
Highs*ate(5V): IBM mode
Low state: 3 Bit TTL
2
Audio select
High state (5 V or open): Audio inputs from pin 13. ^
Low state (less than 0.4 V): Audio inputs from the LINE A AUDIO IN jack
3
H. sync or composite sync
Negative polarity -
When the high state is selected at pin 9:
1 V p-p, 75-ohm terminated
When the low state is selected at pin 9 ■
m level
4
Blue input
Positive polarity
When the high state is selected at pin 9 •
5
6
7
Green input
Red input
12 V power supply
Analog signal (0.7 V p-p, 75-ohm terminated, non sync)
When the low state is selected at pin 9:
Digital signal (TTL level)
8
5 V power supply
0.6 A max -----
9*
Analog/digital mode select
High state (open): Analog signal (0.7 V p-p)
Low state (ground); Digital signal (TTL level)
Pin No.
Signal
Signal level ~ -
10
RGB/NORMAL mode select
High state (5 V or open): RGB inputs from a microcomputer
Low state (ground): Composite video inputs from the LINE A VIDEO IN connector
11
V-sync
Negative polarity
TTL level
12
Blanking
High state (5 V or open): Video inputs from a microcomputer only
Low state (ground): Composite video input from the LINE A VIDEO IN connector
During the low state, the video signal from the microcomputer is blanked and the
^ -
13
Audio input
Input level -5 dB (100% modulation), input impedance more than 47 k ohms
15-24
EXT/INT mode sync switch
Ground
High state (open): Sync signal input from the CMPTR connector
LOW state: Sync signal input from the LINE A VIDEO IN connector
25*
IBM luminance signal
Positive polarity
When the high state is selected at pin 1 • TTL level
When the low state is selected at pin 1: Low state (qroundi
♦ Examples for microcomputer connections
No.
Microcomputer\
9
25
SMC-70/SMC-70G
-
High state
IBM computer
High state Low state IBM luminance signal
TTL 3BIT computer Low state Low state Low state
Wh. e the information given is true at the time of printing, small pro¬
duction changes in the course of our company's policy of improve-
men through research and design might not necessarily be in¬
dicated in the specifications. We would ask you to check with your
appointed Sony dealer if clarification on any point is required.
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