PIF/AFT/SIF/AGC
ADJUSTMENT (Continued)
SOUND DETECTOR
COIL: T1301
This coil (in IF unit) has been factory
preset (no adjustment is basically
needed).
1.
Connect
SSG
output to pin
(16)
of
IC1201.
l The probe in use should be a
75Q
DC cut
probe.
l
SSG
output level:
80dB
(5.5
MHz
CW)
2.
IFAGC:
Apply 4.5V DC to pin
(1)
of
IC1201.
3.
Connect DC voltmeter to pin
(9)
of
IC1201.
(Full scale:
1OV)
4.
AUDIO-MUTE ON:
Have pin
(4)
of IF unit grounded, and read the
value then available on the voltmeter
(VTVM).
It should be approx. 4.5V.
5.
AUDIO-MUTE OFF:
Remove the grounding at pin
(4)
of IF unit.
6.
Adjust T301 so that the voltmeter indicates the
same value as in step 4 above.
AUDIO MUTE CHECKING
1.
Receive “PAL COLOUR BAR” signal.
2.
Set the Sound control at maximum position.
3.
Stop reception of “PAL COLOUR BAR” signal.
(Pull out the antenna)
4.
Check that no output of
400
Hz signal is heard
from the speaker.
6
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