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FM ALIGNMENT PROCEDURE
INSTRUMENTS:
*FM Signal Generator modulated with 100Hz at 100%.
* AC/DC VTVM and Oscilloscope.
NOTE: *Set Function Seelctor Switch to FM.
*Connect Signal Source to FM Antenna Terminals.
SIGNAL
CONNECT OUTPUT
STEP
FREQUENCY
STRENGTH
DIAL SETTING
METER TO
ADJUST
ADJUST FOR
1
2
3
4
5
6
7
8
9
10
STEP
1
2
STEP
1
2
Quiet Point on
Band
Same as Above
Near 98MHz
-1 dB of Limiter
Tune for Zero
Saturation
Volts DC at
R226 (47 k ohm)
Repeat Steps 2 and 3 until no further improvement is noticed
90MHz
Approx. 1 0µV
90MHz
106MHz
Approx. 10µV
106MHz
Repeat Steps 5 and 6 until no further improvement is noticed
90MHz
-3dB of Limiter
Tune for Zero
Saturation
Volts DC at
R226 (47 k ohm)
106MHz
Same as Above
Same as Above
Repeat Steps 8 and 9 until no further improvement is noticed
POWER AMPLIFIER IDLING ADJUSTMENT
INSTRUMENT: *DC VTVM.
NOTE: *Set Function Selector Switch to AUX.
Oscilloscope to
T201 Top and
Maximum Noise
R226 (47 k ohm)
Bottom
(on Front End)
Same as Above
T202 Top
Zero Volts DC
Oscilloscope to Tape
T202 Bottom
Maximum Symmetric
Out Jack
Output on
Oscilloscope
Oscilloscope to
L201 (OSC)
Zero Volts DC
R226 (47 k ohm)
(on Front End)
Same as Above
TC201 (OSC)
Zero Volts DC
(on Front End)
VTVM and
L202 (RF)
Maximum Output
Oscilloscope to
T203 (ANT)
Tape Out Jack
(on Front End)
Same as Above
TC202 (RF)
Maximum Output
TC203 (ANT)
(on Front End)
*Set Volume Control to minimum and set Tone/Balance controls to mid position.
*Set Stereo/Mono Switch to Stereo.
*Speaker Switch to ON.
*Connect 8 ohm (50W) resistor across left and right speaker terminals.
DC VOLTMETER
CONNECTION
ADJUST
ADJUST FOR
Across R428 Resistor
VR402
10mV±1mV
Across R427 Resistor
VR401
10mV±1mV
TUNING INDICATOR ADJUSTMENT
INSTRUMENT: *FM Signal Generator.
NOTE: *Set Function Selector Switch to FM.
*Connect Signal Source to FM Antenna Terminals.
SIGNAL
FREQUENCY
STRENGTH
DIAL SETTING
98MHz
1mV(60dB)
Tune for Zero
Volts DC at R226
(47 k ohm)
Same as Above
Same as Above
Same as Above
-4-
ADJUST
VR201
VR202
ADJUST FOR
Maximum Needle
Deflection on
Tuning Meter
To Indicate 9 on
Tuning Meter
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