Sharp GF-575H - Fm Stereo Indicator; Lighting Level

FM IF/RF ALIGNMENT
@ Set the Band selector switch SW1 to FM position.
@ Set the FM mode/FM muting switch SW105 to stereo/off position.
SIGNAL GENERATOR RECEIVER
TEST
(Refer to Figure 26-9)
STEP
|
BAND
ADJUSTMENT
STAGE
CONNECTION
TO
INPUT
SIGNEL
DIAL
SETTING
RECEIVER
FREQUENCY
iF
Refer
to
Figure
264.
|
Exactly
10.7MHz.
High
end
of
dial.
Adjust
for
best
Adjust
the
FM
1
FM
See
({Unmodulated)
(minimum
capacity)
“S"
curve.
IF
transformers
1.
(T1)
Note
B
2. (T2)
;
Refer
to
Figures
26-5
|
Exactly
87.3MHz.
Low
end
of
dial.
;
Adjust
for
Adjust
the
FM
local
and
26-6.
pcahe
FM
{maximum
capacity)
Dee!
osciliator
coil
(L4).
modu
output.
EM
Shee
;
;
:
;
Same
as
step
2.
coat
salitti
Aiea
of
dial.
Same
as
step
2.
Adjust
the
FM
local
z
f
minumum:
capacity,
oscillator
trimmer
(C19).
L
modulated)
--—-
+—..
Same
as
step
2.
Exactly
88MHz.
88MHz.
Same
as
step
2.
Adjust
the
FM
4
(400Hz,
30%,
FM
RF
coils
(L2,
L3).
modulated)
t———
FM
_
|
Tracking
}/—
—_|—
is
eee
Same
as
step
2.
Exactly
108MHz.
108MHz.
Same
as
step
2.
Adjust
the
FM
5
(400Hz,
30%,
FM
RF
trimmer
(C4).
modulated}
6
FM
Repeat
steps
2,
3,
4
and
5
until
no
further
improvement
can
be
made.
| Color Mark
Color Mark
There are 5 kinds of ceramic filters (CF1, CF2) available
with this unit and they are given color indication as 1. Input
tabulated right to differentiate the central frequency from 2 SNe
3. Output
one to another among them. When using them, be sure to
make the two of the same type a pair.
When other ceramic filters than the one (red) having the
central frequency of 10.7 MHz are used, note that a marker
30h '
|D | Black: [| 10.64MHz +30kHz
+
(10.7 MHz) of FM sweep generator, if used, will be deviated rahe B | Blue: | eliacesesaal
— therefore, adjust the generator by putting off the requency | A | Red: [10.7 z z
marker. (fo) 10.73MHz +30kHz
White: 10.76MHz +30kHz
FM STEREO ALIGNMENT
@ Set the function selector switch SW102 to radio position and FM mode/FM muting switch SW105 to stereo/on position.
RECEIVER
SIGNAL GENERATOR
STEP CONNECTION TO INPUT SIGNAL
RECEIVER FREQUENCY
Refer to Figures 26-6 Exactly 98MHz (54dB)
and 26-7. unmodulated.
ADJUSTMENT
DIAL SETTING REMARKS
Adjust for 19
+0.1kHz.
Turn the FM muting sensitivity adjust-
ing semi-variabte resistor (R21) fully
counterclockwise. Adjust the semi-
variable resistor (R27)
FM STEREO INDICATOR LIGHTING LEVEL ALIGNMENT
® Set the function selector switch SW102 to radio position and FM mode/FM muting switch SW105 to stereo/on position.
SIGNAL GENERATOR
CONNECTION TO INPUT SIGNAL
RECEIVER FREQUENCY
Exactly 98MHz
(20dB). (19kHz,
10%, FM
modulated)
RECEIVER
STEP | BAND ADJUSTMENT
DIAL SETTING REMARKS
Adjust the semi-variable
resistor (R21).
98MHz Adjust so that
the indicator
starts lighting.
Refer to Figures 26-6
and 26-8.
Stereo
—23—