Sharp QT-95H Serviceanleitung Seite 14

QT-95H(BK)
© CIRCUIT ADJUSTMENT (TUNER SECTION)
AM IF/RF ADJUSTMENT
Power: On
Volume Contro!: Maximum
Fonction Selector: Radio
a 400 Hz, S06 AM modulated :
a
TEST FRE-
STEP | STAGE | QUENCY |POINTER | |
MW IF (Set the band selector each to MW position.)
455 kHz | High |
For UK: | frequency
468 kHz
LW RF (Set the band selector switch to LW position.)
145 kHz | Lowest L10
frequency
SWITCH
POSITION
Adjust for
best "'IF'' curve.
Band
La
coverage
Highest Adjust for
frequency maximal
output.
170 kHz | 170 kHz /|L7 (LW)
Tracking
270 kHz | 270 kHz |TCS
Repeat steps 2, 3, 4 and 5 until no further improvement can
be made.
MW REF (Set the band selelctor switch to MW position.)
Lowest
Band frequency
coverage
Tracking
Highest Adjust for
frequency maximal
output.
600 kHz |L7 (MW)
a
Repeat steps 7, 8, 9 and oor until no further improvement
can be made.
SW RF (Set the band selector switch to SW position.)
Band
coverage
Tracking
16 MHz
Repeat steps 17 and 18 until no further improvement
can be made.
Lowest L8
frequency
Highest Adjust for
oy maximal
output.
— ®&
| | - Oscilloscope
Sweep
Test
|
IC2
Generator Loop Bar Antenna
Figure 22—1 AM IF
455 kHz
For UK: 468 kHz
Figure 22—2 AM IF CURVE
_ Electronic
Signal Test Voltmeter
Generator Loop '_ Bar Antenna
Figure 22—3 AM RF
Electronic
Signal Rod Antenna IC3 Voltmeter
Generator
Dummy
(See Figure 22-5)
Figure 22—4 SW RF
'—>. To Rod Antenna
C >
z —R = 30 ohms
Z=50 ohms ee
Z: Output impedance of signal generator
To Chassis GND
Figure 22—5 SW DUMMY
—22—