Lafayette LR 3030 Service Manual

Page 1

8 10m! _modulor III-fl component/-
Pages 45-53 Courtesy of LAFAYETTE RADIO ELECTRONICS

ALIGNMENT INSTRUCTIONS

lafayette [II-3030

Maintain line voltage at 120V AC.
Use only enough generator output to obtain a suitable indication.
Suggested Alignment Tools:

GC ELECTRONICS:

CAUTION: Use isolation transformer or observe polarity when connecting test equipment.
Connect low sides of generator and indicator to ground unless specified otherwise.
Allow a 15-minute warm~up period.

FIG. I FIG. 7

AM ALIGNMENT-SELECTOR IN AM POSITION

Connect generator across loop fashioned of several turns of wire.

Set volume at maximum.

GENERATOR RADIO DIAL

FREQUENCY SETTING INDICATOR ADJUST REMARKS

4SSkHz Tuning gang Output meter (1) CF4 Adjust for maximum. Repeat until
400-hertz fully open across voice coil no further improvement is noted.
Modulation

600kHz 600kIIz T7 Adjust for maximum.

1640kHz 1640kIIz " CTS Adjust for maximum.

l400kHz 14001412 CT4 Adjust for maximum. Repeat AM alignment

until no further improvement is noted.

FM IF ALIGNMENT USING FM SIGNAL GENERATOR-SELECTOR IN FM POSITION

High side of generator thru .001uF to Junction of C4 and C5.
Use 60-hertz, frequency-modulated signal, 450kHz sweep.
Use 60-hertz sawtooth voltage in scope for horizontal deflection.

GENERATOR

RADIO DIAL

of 1C2.

FREQUENCY SETTING INDICATOR ADJUST REMARKS
10.7MHz Point of non- Vert input of (1) T5,
ASOkHz Sweep interference scope topin 1 Adjust for maximum gain and symmetry
of 1C1 with of response similar to Fig. l.
Detector Probe.
" " Vert input. of Adjust T6 for maximum amplitude
scope to P1 3 T6 and straightness of line, similar to

Fig. 2.

FM RF ALIGNMENT-SELECTOR IN FM

POSITION

Adjustment of

Connect generator across antenna terminals with
coils by bending should not be attempted unless

lZO-ohm carbon resistor in series with each lead.

the coil is deformed or replaced.

GENERATOR RADIO DIAL

FREQUENCY SETTING INDICATOR ADJUST REMARKS

88MHz AC probe of WW T3,TZ, Adjust for maximum.

Modulated 88MHz across speaker. T1

III/Iggyllzted 108MHz " gicn Adjust for maximum. Repeat FM RF steps

until no further improvement is noted.

(1) Before adjusting, vary generator frequency slightly. Maximum output indicates exact IF.

45

Page 2

FM STEREO ADJUSTMENT

Tune receiver for a stereo signal. Adjust balance control for equal channel output. Adjust Separation
control RVS for best separation.

FM STEREO ALIGNMENT USING AUDIO GENERATOR

Ground Pin 6 of 1C1, connect generator to Pin 2 of 1C2.

GENERATOR
FREQUENCY 'ND'CATOR ADJUST REMARKS
19km $111316 Frequency Counter to W4 Adjust for 19kHz 120m.

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