Fm If/Rf Alignemimt; Fm Stereo Alignemnt; Dial Cord Stringing; Fm Dummy - Sharp GF-5454H Service Manual

• Set the signal generator to produce a signal of 400Hz, 30%,
FM modulated.
TEST FRE-
STEP BAND STA- QUEN-
GE CY
IF(As shown in Figure 13—1, make connection of instrument.)
10.7
1 FM IF
MHz
RF(As shown in Figure 13—2, make connection of instrument.)
87.3
2 FM
Band MHz
cover-
age
108.3
FM
3
MHz
88
4 FM
MHz
Track-
ing
5 FM
MHz
Repeat steps 2,3,4 and 5 until no further improvement
6
can be made.

FM STEREO ALIGNEMNT

Set the Band Selector Switch (SW1) to "FM" position and
FM Mode Selector Switch (SW104) to "stereo" position.
Before this adjustment, connect the anode side of Stereo
Indicator (D111) to GND.
As shown in Figures 13-3 and 13-4, make connection of
instrument.
DIAL
FREQUENCY
POINTER
un modulated

DIAL CORD STRINGING

1) Turn the drum fully clockwise and stretch its cord cover
the parts in the numerical order —as shown in Figure 13—5.
2) Turn the tuning control shaft fully counterclockwise, and
fix it with the pointer aligned with the zero (0) point on
the frame. See Figure 13—6.
"0" Point
Figure 13-6
4 turn
DIAL AD-
SET- REMARKS
JUST-
TING MENT
High Adjust for
T1
end of best "S"
T2
dial
Low
end of
L3
dial
High
Adjust for
end of TC2
maximum
dial
output
L2
MHz
TC1
MHz
ADJUST-
REMARKS
MENT
Adjust for
VR1
38 ± 0.15kHz
10.7 MHz,
FM SWEEP GENERATOR Rod Antenna
Figure
Figure 13—2
FM STEREO
SIGNAL GENERATOR Telescopic
————————— Rod Antenna
(See Figure 13-4)
DUMMY
R1
Z: Output impedance of signal generator
Figure 13-4 FM DUMMY
OSCILLOSCOPE "S" curve
13-1
EXT. SP
(J105. 1061
•R1 = 50 ohm
R2 - 50 ohm