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SG-290H/HB
©
ADJUSTMENT OF TUNER CIRCUIT
FM
iF/RF
ADJUSTMENT
@
Set the function selector switch at FM position.
@
Set the signal generator to produce a signal of 1kHz, 40kHz dev.,
FM modulated.
@
8Sefore the adjustment, loosen the core of T203 by about 1mm.
FRE-
DIAL
QUEN-
| POINTER
cY
SETTING
AD-
JUST-
MENT
TEST
STAGE
REMARKS
IF (Connect instruments as shown in Fig.10—1.}
Adjust
for
best
"IF"
T101
Curve
High
frequency
10.7MHz
Adjust
for best
"S"
T203
Curve
tion
Repeat steps 1 and 2 until no further improvement can be made.
RF (Connect instruments as shown in Fig.10—4.)
Lowest
li
87.35MHZ | ecuency
L103
Band
coverage
Highest
108.30MHz
frequency
TC103
Adjust
for
output.
maximal
L101,
L102
Tune to
90MHz
90MHz
Tracking
r
3
Tune to
VO6MHz | so6MHz
TC101
TC102
Repeat steps 4, 5 and 6, 7 until no further improvement can be made.
VCO
FREQUENCY
ADJUSTMENT
©
Connect instruments as shown in Fig.10—5.
©
Set the function selector switch at FM stereo position.
FM modulated (mono signal).
DIAL
POINTER
SETTING
ADJUST-
FREQUENCY
MENT
REMARKS
* Tune to
98MHz
Adjust for
19 kHz +
25 Hz
98MHz at 60dB
VR301
+
After tuning the set to 98 MHz, perform the adjustment with the FM signal
generator unmodulated.
FM Signal
generator
FM External
Antenna Socket
Frequency counter
TP301@
TP301 @)
Ground
Figure 10-5 VCO FREQUENCY ADJUSTMENT
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C4
Figure 10-6
ADJUSTMENT POINTS (DECK)
-10-
Oscilloscope
Sweep
generator
FM External
Antenna
Socket
TP201 @
Ground
Figure 10-1 FM IF ADJUSTMENT
10.7 MHz
10.7 MHz
Figure 10-2
;
FM
"IF"? CURVE
Figure
10-3
FM "S" CURVE
Electronic
FM Signal
voltmeter
generator
FM External Antenna
Socket
TP201(1)
TP201@)
Ground
Figure 10-4 FM RF ADJUSTMENT
AM
FM
EX
ANT. SOCKET
%,
Cc
Teel
*G
L205 L204
aed
®
Tc203
| |TCIO3
TCloz TCIOI
TC201 KX} TC202
L202(A)
L202(B)
Figure 10-7 ADJUSTMENT POINTS
(TUNER)
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