Service Manuals, User Guides, Schematic Diagrams or docs for : Lafayette Audio LR-9090 Lafayette-LR-9090-Service-Manual
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R fO mt hi'ti (ompone ntr- lafayette IB-9090
-ffrodulor
Pages 33-42 Courtesy of LAFAYETTE MDIO ELECTRONIcs
AM ATIGNMENT-SELECTOR IN AM POSITION
Connect generator across loop f,ashioned of several turns of wire. Set volune at naxinun.
GENERATOR RADIO DIAL
INDICATOR ADJUST REMARKS
FREQUENCY SETTING
45Skt{z Tuning gang Output meter Adjust for maxirnum. Repeat until
40 0 -hert z ful 1y open across voice coil CF4 no further irnprovement is noted.
Modu I at ion
60 0kHz 6 00kt Iz il T4 Adjust for maximum.
1640k[{z 1640kllz il cr7, cr6 , T3 Adjust for maximum.
140OkHz 1400k1{z cr5 Adjust f or maximum. Repeat Alt al ignment
until no further improvement is noted.
FM IF ALIGNMENT USING FM SIGNAL GENERATOR-SELECTOR IN FM POSITION
High side of generator thru .001uF to Base FTR3.
Use 60-hertz, frequency-modulated signal, 450ktlz sweep.
Use 60-hertz sawtooth voltage in scope for horizontal deflection.
GENERATOR RADIO DIAL
INDICATOR ADJUST REMARKS
FREQUENCY SETTING
T0 "7MHz Po int of non- Vert input of T2 , FTs (1) Disconnect stabilizing capacitor
450kHz Sweep int erferenc e scope to T1, L3 Adjust for maximurn gain and symmetry
Junction of response similar to Fig. 1.
Re connect
I
Vert input of r1 (1) Adjust Tl for maximum amplitude
scope to posi- and straightness of line, similar to
tive end CzS Fig . 2.
FM RF ATIGNMENT.-SELECTOR IN FM POSITION
Connect generator across antenna terrninals with lz}-ohm carbon resistor 1n series with each 1ead.
Adjustment of coils by bending should not be attempted unless the coil l-s deformed or replaced.
GENERATOR RADIO DIAL REMARKS
INDICATOR ADJUST
FREQUENCY SETTING
108MFIz 108MHz DC probe of VTVM FT4 , FT3, .Adjust for maximum.
Modulated to positive end FTz, FTl
c25
88MHz 8 8lt4Hz cr4, cTs Ad just for maximum. Repeat FIvl RF steps
Modul.ated crz,cr1 unt i 1 no further improv ement i s not ed .
I 9kHz
Disconnect coupling Lytic CzS. Adjust RV4 for l9kHz +20H2 at TP4.
33
FM STEREO ADJUSTMENT
Tune receiver for a stereo signal. Adjust balance control for equal channel output. Adjust Separation
control RV3 for best separation.
Signa1 Strength
For Al'1 Tune strong AIvt station, adjust RV 2 for Maximum deflection
on Signal Meter Ml.
For FM Tune strong signal , adjust tuning for 0 on Tuning lr{eter Mz
and adjust RVI for Maximum deflection on Meter MI.
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