Sharp SC-7700CDH - Tuner Section; AM IF Specifications; FM IF Specifications; FM Auto Scan DC Voltage;Distortion

|
§C-7700CDH
©
TUNER SECTION
fL: Low-range frequency
fH: High range frequency
- AM IF
Signal
generator:
400
Hz,
30%,
AM
modulated
Setting/
Test Stage Frequency
Adjusting
Parts
450
kHz
«|
1,611
kHz
|
L409
ie
L407:
Coverage
(AL)
MW
603
kHz
603
kHz
L405
(fL)
*
Tracking
1,404
kHz
|
1,404
kHz
|
TC401
{fH)
Instrument
Connection
Frequency
Display
L408:
Coverage (fL)
LW 162 kHz 162 kHz L406 (fL)
Tracking 261 kHz 261 kHz TC402 (fH)
*1. Input: Antenna
Output: Pin 12 of 1C401
*2. Input: —
Output: TP2
- FM IF
Signal
generator:
1
kHz,
40
kHz
dev.,
FM
modulated
Setting/
Adjusting
Parts
L410
Instrument
Connection
Test Stage | Frequency Frequency
Display
10.7 MHz | 108.0 MHz
*1. Input: Antenna
Output:
Pin
10
of
1C401
-
FM
Auto
Scan
DC
Voltage/Distortion
Signal
generator:
1
kHz,
40
kHz
dev.,
FM
modulated
Ecaauene
Frequency
Adjusting
Instrument
i
id
Display
Parts
Connection
Input: Antenna
Output: Both
sides of R429
98.0 MHz m
(60
a)
98.0
MHz
L410
*1
*1
Adjust
the
L410
so
that
voltmeter
reads
0
+
50
mV.
VR402:
Center
- FM Auto Stop Level
Signal
generator:
1
kHz,
40
kHz
dev.,
FM
modulated
Frequenc
Frequency
Adjusting
instrument
: i
Display
Parts
Connection
Input:
Antenna
98.0
MHz
-
*
Output:
*1
Adjust
the
VR402
so
that
speaker
output
is
appear.
Speaker output
GE NERATOR LOOP
FM ANTENNA ¢¢
TERMINAL ELECTRONIC
SPEAKER VOLIMETER
U
a ‘=
Figure
16-1
FM
AUTO
SCAN
DC
VOLTAGE/FM
AUTO
STOP
FM SIGNAL
GENERATOR
AM
TP2
ELECTRONIC
VOLTMETER
AM SIGNAL Test OOF,
Figure 16-2 AM AUTO STOP
R41
FM ANTENNA TERMINAL
FM ANTENNA TERMI] NAL
Z:QUTPUT IMPEDANCE OF SIGNAL GENERATOR
R1=112. 5 OHMS
Z=75 R2=75 OHMS
R3=150 OHMS
R1=125 OHMS
Z=50 R2=50 OHMS
R3=150 OHMS
Figure 16-3