DV-SV97H - Sharp DVD Service Manual (repair manual). Page 28

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12.2 Scart Connectors 
 
 
Some cheaper SCART cables use unshielded wires, which is just about acceptable for 
short cable lengths. For longer lengths, shielded co-ax cable become essential. 
Scart Signals: 
Audio signals 
0.5V RMS, <1K output impedance, >10K input impedance. 
Red, Green, Blue 
0.7Vpp 
±2dB, 75R input and output impedance. Note that the Red connection (pin 20) can 
alternatively carry the S-VHS Chrominance signal, which is 0.3V. 
Composite Video / CSync 
1Vpp including sync, 
±2dB, 75R input and output impedance.Bandwidth = 25Hz to 4.8MHz 
for normal TV Video de-emphasis to CCIR 405.1 (625-line TV) 
Fast Blanking 
75R input and output impedance. This control voltage allows devices to over-ride the 
composite video input with RGB inputs, for example when inserting closed caption text. It 
is called fast because this can be done at the same speeds as other video signals, which is 
why it requires the same 75R impedances. 
13 
0 to 0.4V: TV is driven by the composite video input signal (pin 19). 
Left unconnected, it is pulled to 0V by its 75R termination. 
1V to 3V: the TV is driven by the signals Red, Green, Blue and composite sync. The latter 
is sent to the TV on pin 19. This signal is useful when using a TV to display the RGB output 
of devices such as home computers with TV-compatible frame rates. Tying the signal to 5V 
via 100R forms a potential divider with the 75R termination, holding the signal at around 
2V. Alternatively, if a TTL level (0 to 5V) negative sync pulse is 
available, this will be high during the display periods, so this can drive the blanking signal 
via a suitable resistor. 
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