General Output Connections
ADC select Output (ADC_SEL)
Pin 2 of the microcontroller is connected to the analogue switch I304. When this line is HIGH, the tuner
AGC voltage is connected to ADC2, AV1.SW (scart pin 8 input) is connected to ADC3.
When this line is LOW, AV4.SW (scart pin 8 input) is connected to ADC2; AV2.SW (scart pin 8 input) is
connected to ADC3.
Storage-Register Clock Output (RCLK)
Pin 50 of the microcontroller is connected to the rising edge (positive triggered) input (pin 12) of I004. This
line is normally low when not communicating with the device or when shifting data into it. Once the full 8-
bits have been shifted in, this line rises in order to latch the data to the device?s outputs.
EEPROM Write Enable Output
Pin 32 is the E2 write enable output line, which is connected to pin 7 of the EEPROM (I006). When this
output is HIGH, the E2 cannot be written to (write disable) but data from the device can be read. When this
output is LOW, then data can be written to the E2. This hardware line helps to protect the E2 from
inadvertent write operations, which could occur under abnormal circumstances.
Scart VideoLink Output
Pin 7 is used to apply an 8Volt signal on pin 8 of SCART1 on DTT models. This is to allow a VideoLink
enabled VCR to record a programme from the DTT module timer.
Mute Output
Pin 3 is the mute output for the on-board audio amplifiers. This output is HIGH when the amplifiers are in
the mute condition (e.g. Standby). When powering down, this output will quickly rise to mute the speakers,
to prevent any unwanted ?popping? noises from being heard.
Compress Output
Pin 46 is the output for the compress relay control (where fitted). This output is HIGH to turn the compress
relay on.
Rotation Output
Pin 45 is the output for the tube rotation control (where fitted). The output is a PWM signal, which is
converted, to an analogue voltage level by the external low pass filter circuit.
VM On/Off Output Connection
Pin 6 is used to turn On (LOW) or Off (HIGH) the VM (velocity modulation) circuit of some high-end
chassis. This improves the transition from black to white (and vice versa) areas of the picture to sharpen
them up. This is particularly noticeable at the outer areas of the CRT.
Green LED Output
Pin 5 is the green LED output, which is only used on models fitted with a DTT module. This output is high
when the green led is ON. When the DTT module is in the partial standby state or when recording a digital
terrestrial programme, then this LED will be ON and will be mixed with the red LED to produce an amber
colour. When the DTT module is connected via the telephone line and receives mail, then this LED will
flash periodically to indicate this condition.
Red LED Output
Pin 4 is the red LED output, which is used to indicate the standby state and when an IR command has
been successfully received and decoded. When the TV is in the standby state, this output will be HIGH to
ensure that the red LED is brightly lit. When the TV is not in standby, then this output will be low, but the |
ACEC
