when the TV is powered up and normally changes state between (+5V and 0V).
22
Pin 24 is the IC bus clock output for clocking the datC pera to ipherotherals /Idevices. The clock line is also isconnected
from the main chassis when in the standby state or when writing to the EEPROM. This line oscillates at a frequency
around 90KHz
RS232 Connections
Pin 30 is the RS232 Transmit line from the microcontroller. When the Scart disable output from the microcontroller (pin 39)
is low, then the TXD can be routed from pin 1 to pin 2 of I007 (74HC4066). There is never a situation whereby both disable
outputs are low.
Pin 37 is the RS232 Receive line for the microcontroller. When the Scart disable line is low, then the data can be routed
from pin 10 of scart 2 to pin 10 of I007 and then through to pin 37 of the microcontroller. There is never a situation when
both RS232 enable lines are HIGH (disable outputs LOW).
RGB Connections
Pin 44 is the OSD/Teletext RGB blanking signal necessary for allowing insertion of the OSD/Teletext onto the picture.
When this output is high (approx. +5v), then the RGB signal will be superimposed onto the current picture.
Pin 45 is the OSD blue signal necessary for displaying BLUE colours for the OSD and Teletext.
Pin 46 is the OSD green signal necessary for displaying GREEN colours for the OSD and Teletext.
Pin 47 is the OSD red signal necessary for displaying RED colours for the OSD and Teletext.
CVBS Connections
Pin 60 is the Composite Video signal input for VPS and WSS slicing. It is normally AC coupled and internally clamped to
ensure reliable operation. VPS (video programming system) is necessary when auto-sorting programmes in
Germany/Austria/Switzerland. WSS (wide-screen signalling) is used to indicate the aspect ratio of the incoming signal.
The TV can then use this information to display the picture in the correct format.
Pin 61 is the Composite Video signal input for Teletext acquisition and decoding and also for sync extraction, necessary
for obtaining the correct line timings for slicing the teletext information and VPS/WSS information.
Y2-Y3-SW Output
Pin 26 is the Y2-Y3-SW relay S3(Low) or S2(High) control.
V-MUTE1 Output
Pin 29 is the V-MUTE1 output relay MUTE(High) or Active(Low) control.
Digicon-busy Input
Pin 31 is the Digicon-busy input from the Digital-Conv-Unit.
This input is used to detect if the MAGIC-FOCUS has been moved.
CUT-OFF Output
Pin 32 is used the CUT-OFF relay enable(High) or disable(Low) control. |
ACEC
