Sharp CD-JX20X(GY) - Tuner Section

TUNER SECTION
fl-:Low-range frequency
fH:High-range frequency
l AM IF/RF
Adjustment
Adjusting part Setting
IF CF3
[Optimize IF
waveform.
Frequency cover
fL:L2 (531 kHz) fL: 1.1 f 0.1 v
(Pin 6 of TUNl Vt
fH: 7.2 + 1.0 V
line voltage)
- 0.5 v
(fH needs only
check.)
Tracking
fL: L3 (603 kHz) Raise speaker
fH: TCl (1,404 kHz) terminal output up
to maximum.
l FM IF/RF
Test Stage
Detection
1 Adjusting point Specified
Value/adjusting
method
Tl (98 MHz, 60 dB)
0 * 30 m V(DC)
l FM Autostop Sensitivity
Signal oscillator Adjusting part
Mono 30 dB
VRI (98 MHz)
Adjusting method
Adjust to the place
where change from
3 V to 0 V occurred.
l VCO Frequency
Signal oscillator
Setting
Adjusting part
No modulation VU2
19 kHz + 100 Hz
l Adjusting signals
Frequency Modulation Modulation
Antenna input
frequency
/factor level
TI
FM monaural
98MHz
FM stereo
400Hz 225kHzdev 60dB
98MHz
1,OOOHz
*1
160dB
‘1Max. frequency deviation is 67.5 kHzdev in case of SSG
output mode MAIN.
Frequency deviation caused only by SSG pilot signal is 7.5
kHzdev.
ELECTRONIC
AM SIGNAL
BAR ANTENNA
IC2
VOLTMETER
GENERATOR
PIN12
UNIT
0
GND
LOOP ANTENNA
Figure 19-I AM IF
ELECTRON I C
CNP3
VOLTMETER
cl
0
0
Figure 19-2 FM IF
FM SIGNAL
ELECTRON I c
GENERATOR
ROD
:.
VOLTMEl-ER
ANTENNA
BOTti SIDE
-
“I
I
Figure 19-3 FM AUTO STOP SENS.
FM S IGNAL. A,,,;;;,,
GENERA rOli -
I
FREWNCY
COIJNTER
75onm
DUMMY
Figure 19-4 VCO FREQUENCY
AM TRACKING flj
1 TUNER PWE
STOP
SENS. -
AM FREQUENCY
COVERAGE fL
CNP3
Figure 19-5 ADJUSTMENT POINTS 1 FM DET. 1
-19-