ALIGNMENT PROCEDURES
STEP
1
2
3
4
5
6
7
8
9
10
STEP
1
STEP
1
2
3
AM
ALIGNMENT PROCEDURE
INSTRUMENTS:
*
AM
Signal Generator modulated with 400Hz at
30%.
*VTVM.
*
AM
Sweep Generator and Oscilloscope.
NOTE: *Set Function Selector Switch to
AM.
*Connect signal source to a placed
to
radiate signals into
AM
Antenna Loop Stick (L251
).
SIGNAL
CONNECT OUTPUT
SOURCE FREQUENCY
METER
TO
AM
Sweep
455kHz
VTVM
and
Generator Oscilloscope
to
R269 (4.7 k ohm)
Repeat Steps 1
through
3
for
best sensitivity
AM
Signal
600kHz
VTVM
and
Generator Oscilloscope
to
R269 (4.7 k ohm)
Same
as
Above
1600kHz
Same
as
Above
Repeat Steps 5 and 6
for
best dial accuracy
AM
Signal
600kHz
VTVM
and
Generator
Oscilloscope
to
R269 (4. 7 k ohm)
Same
as
Above
1600kHz
Same
as
Above
Repeat Steps 8 and 9
for
best sensitivity
MPX ADJUSTMENT
INSTRUMENTS:
*Frequency Counter.
*Signal Generator.
NOTE: *Set Function Selector Switch to
FM.
DIAL
SETTING ADJUST ADJUST FOR
Quiet Point
Near
1600kHz
600kHz
1600kHz
600kHz
1600kHz
T251
Maximum
and
Undistorted
Pattern on
T252
Oscilloscope
T253
\
L252
Maximum
Output
TC251
Maximum
Output
(on
Front
End)
L251
Maximum
Output
TC252
Maximum
Output
(on
Front
End)
For
Service
Manuals
Contact
MAURITRON
TECHNICAL
SERVICES
8 Cherry Tree Rd, Chinnor
Oxon
OX94QY
Tel:-
01844-351694
Fax:-
01844-352554
Email:-
enquiries@mauritron.oo.uk
*Connect Signal Source to
FM
Antenna Terminals.
SIGNAL
FREQUENCY
STRENGTH
DIAL
SETTING
98MHz
lmV
(60d8)
Tune
for
Volts
DC
(unmodulation)
at R226 (47 k ohm)
STEREO INDICATOR LAMP ADJUSTMENT
INSTRUMENT: *Stereo Signal Generator.
NOTE: *Set Function Selector Switch to
FM.
CONNECT OUTPUT
TO
Frequency Counter
to
LP205
*Connect Signal Source to
FM
Antenna Terminals.
SIGNAL
FREQUENCY
STRENGTH
DIAL
SETTING
OUTPUT
98MHz
50µV
(34d8)
Tune
for
Volts
DC
Stereo
Indicator
(Stereo Signal)
at R226 (47 k
ohm)
Lamp
ADJUST
VR301
ADJUST
VR302
Check
Pilot
level
that
Stereo
Indicator
lights
at
6%
of
pilot
level and
that
the
indicator
does
not
light
at
1
%.
Return
pilot
level
to
9%
and check Stereo Separation at 1 kHz,
100Hz
and
10
kHz.
-3-
ADJUST FOR
19kHz±50Hz
ADJUST FOR
Light
ON
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