Publicité
5-3
ADJUSTMENTS ENGLISH
SECAM demodulators
(PAL/SECAM TV's only,
IC 7306
= TDA4650)
White balance
Cut-off
Module 07, IF & sound
A2 & NICAM
(PAL TV's only)
FM demodulator PAL I
FM demodulator PAL BG
Bang &Olufsen
Connect
a SECAM black & white signal to the aerial input.
Set the TV to receive the signal.
Connect an oscilloscope to pin 1 on IC 7306.
Adjust coil 5304 to minimun amplitude.
Connect an oscilloscope to pin 3 on IC 7306.
Adjust potentiometer 3312 to minimum amplitude.
Connect a pattern generator to the aerial input, set it to 475.25 MHz
and select a white picture.
Bring the TV into service mode (see page 1-5).
Set the colour saturation to 0.
Select White balance in the 'Service" menu.
Adjust Green and Blue in the "White balance" menu to the proper
white level.
Press
to store the values.
White in the "White balance" menu must always be set to the value
43,
Connect a pattern generator to the aerial input, set it to 475.25 MHz
and select a colour bar picture.
Bring the TV into service mode (see page 1-5).
Set the colour saturation to 0.
Select Cut off in the "service" menu.
Adjust Red, Blue and Green in the "Cut off" menu until the dark
fields in the test pattern are colourless.
Press
to store the values.
Connect a pattern generator to the aerial input and set it to analogue
sound.
Set the TV to receive the signal.
Connect an oscilloscope to pin 7 on IC 7100 (TDA 3857).
Adjust coil 5102 to maximum amplitude.
Connect a pattern generator to the aerial input and set it to A2
stereo L = 3kHz and R = 1kHz.
Set the TV to receive the signal.
5.5MHz:
Connect an oscilloscope to pin 7 on IC 7100 TDA 3857).
Adjust coil 5102 to maximum amplitude.
5.74MHz:
Connect an oscilloscope to pin 6 on IC 7100 (TDA 3857).
Adjust coil 5101 to maximum amplitude.
Module 7, IF & Sound A2/NICAM
Publicité
