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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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