2.
MF/sound
adjustment
(Fig 7.3)
2.1
The M.F. sound modulator
a. For multi-system France
mono:
Connect a pattern generator
PM 5518) to the
tuner and adjust the generator to SECAM L with a
frequency of 47.25 MHz (SECAM L’). Adjust L
5080 to minimum picture distortion.
Adjust the pattern generator to PAL BG with a
frequency of 475.25 MHz.
Stereo:
Connect an oscilloscope to pin 17 of 7 100
3856). Using L 5104 adjust the amplitude of
the signal to its minimum value.
b. For Europe
stereo and East-European multi
system (BGDK) stereo.
Adjust the pattern generator to PAL BG with a
frequency of 475.25 MHz.
Connect an oscilloscope to pin 15 of IC 7 101
3857). Using L 5 104 adjust the amplitude of
the signal to its minimum value.
c. For NICAM
stereo.
Adjust the pattern generator to PAL BG with a
frequency of 475.25 MHz.
Connect an oscilloscope to pin 15 of IC 7 100
(TDA 3857). Using L 5103 adjust the amplitude of
the signal to its minimum value.
2 . 2
The FM sound modulator
a. For multi system France
+
mono UK.
Adjust the pattern generator to PAL BG with a
frequency of 475.25 MHz with stereo L= 3kHz
and R = 1
5.5 MHz
Connect an oscilloscope to pin 2 of M 24. Using L
5 105 adjust the amplitude to its maximum value.
5.74 MHz (only for stereo)
Connect
oscilloscope to pin 3 of M 23. Using L
5 103 adjust the amplitude to its maximum value.
b. For East-European multi system (BGDK).
6.5 MHz.
Adjust the pattern generator to SECAM DK with a
frequency of 475.25 MHz.
Connect an oscilloscope to pin 2 of M 24. Using
L
5 105 adjust the amplitude to its maximum value.
5.74 MHz (only for stereo)
Adjust the pattern generator to PAL BG with a
frequency of 475.25 MHz with stereo L= 3kHz
and R = 1
Connect an oscilloscope to pin 3 of M 23. Using
L 5103 adjust the amplitude to its maximum value.
c. For NICAM
NICAM I.
Adjust the pattern generator to PAL I with a
frequency of 475.25 MHz.
Select
sound.
Connect an oscilloscope to pin 7 of IC 7100
3857). Using L 5102 adjust the amplitude to
its maximum value.
NICAM BG.
Adjust the pattern generator to PAL
BG
with a
frequency of 475.25 MHz.
Select analoaue stereo sound with L= 3kHz and
R =
5.5 MHz.
Connect an oscilloscope to pin 7 of IC 7100
3857).
Using L 5 102 adjust the amplitude to its maximum
value.
l
5.74 MHz.
Connect an oscilloscope to pin 6 of IC 7100
3857).
Using L 5101 adjust the amplitude to its maximum
value.
2 . 3
AFC and picture demodulation:
Adjust the pattern generator to the system given in
the table below (PAL BGI and SECAM BGDK to
475.25 MHz, SECAM L’ to 47.25 MHz).
an oscilloscope to pin 3 of connector
G 29 and using L 5035 or L 5037 (see table) adjust
the amplitude to its minimum value.
Connect an oscilloscope to pin 11 of connector G
29 and using L 5036 or L 5038 (see table) adjust
to 2V D
C
.
S Y S T E M
Multi French
mono/stereo
I SECAM L’
Europe
stereo
I PAL BG
Europe
mono
I
Multi Eastern- Europe
stereo I SECAM K
Multi Eastern- Europe
mono
- -
UK mono
UK stereo
- -
PAL I
SECAM
BG
_ _
PAL
SECAM K
PAL I
2.4
If t
d i s
d i s
2.5
MF
4 7
s i g
2.6
Ste
B G
the
BG
PCS 59 758
GB
