Sharp RG-375H Serviceanleitung Seite 12
375H(BK)
ERG-
FM IF/RF
ADJUSTMENT
SWITCH
FM
POSITION
SIGNAL
400 Hz. 30%, FM modulated
GENERATOR
TEST
FRE-
STEP
STAGE
QUENCY
1
10.7 MHz
2
Detec-
tion
3
Repeat stepb.l and 2 until no further
made.
• Band
87.4
4
coverage
5
Repeat
step 4 until
VCO
FREQUENCY
SIGNAL
400 Hz, 30%. FM modulated
GENERATOR
DIAL
FREQUENCY
POINTER
SETTING
FM mono position
98 MHzat60dB
98 MHz
FM
STEREO
SEPARATION
SWITCH
FM
POSITION
FM
STEREO
Main:
MODULATOR
Pilot:
SIGNAL
400 Hz. 22.5 kHz dev. (stereo signal)
GENERATOR
DIAL
FREQUENCY
POINTER
SETTING
98 MHz at
98 MHz
74 dB
ANSS
ADJUSTMENT
SWITCH
FM
POSITION
SIGNAL
400 Hz. 30%, FM modulated
GENERATOR
DIAL
FREQUENCY
POINTER
SETTING
19 kHz
108.0
• Make the electrolytic
mono
DIAL
ADJUST.
POINTER
MENT
SETTING
I. using a minus
T901
Lowest
frequency
2. Adjust for
TIOI
Adjust
improvement
MHz
Lowest
TC901
Adjust for
frequency
maximal
output.
no further
improvement
can be made.
ADJUSTMENT
(mono signal)
ADJUST.
REMARKS
MENT
FM stereo position
(unmodulated)
VR402
Adjust for 19 kHz ± 50 Hz.
ADJUSTMENT
stereo
1 kHz.
22.5 kHz dev.
19 kHz, 6.75 kHz dev.
ADJUST-
REMARKS
MENT
VR401
Adjust
for maximal
separation.
stereo
ADJUST-
REMARKS
MENT
MHz
L 101
Adjust for minimum
capacitor
C 158 shorted.
10.7MHz
FM Sweep Generator
REMARKS
driver, turn
the core of
T 101 counter-
clockwise
before taking
it out
of the
bobbin.
best
"IF"
curve.
for
best
S
curve.
can be
FM Signal
Generator
o
FM
stereo
Modulator
output
IF:
Detection:
Antenna
Socket
Speaker
0.022gF
unit
GND
Figure 12—
1 FM
IF
Figure 12—
2 FM
"IF"
CURVE
Figure 12
—3
FM
"S"
CURVE
vco:
Antenna
Socket
ANSS:
TPI
VCO: TP2 Voltmeter
ANSS:
unit
GND
GND
Figure 12—4 VCO/ANSS
FM
Signal
Antenna
Generator
Socket
unit
o
98 MHz
Dummy
(See Figure 14—1.)
Figure 12—5 SEPARATION/A.N.C.
TPI
Oscilloscope
Socket
GND
Electronic
TP3
o
Spa ker
Tern
inal
R-ch
Lech
GID
