Read Sharp SD-CX1 (serv.man5) Service Manual online
SD-CX1H
– 24 –
ADJUSTMENT
fL: Low-range frequency
fH: High-range frequency
fH: High-range frequency
Signal generator: 400 Hz, 30%, AM modulated
• AM IF/RF
• Setting the Test Mode
When setting the tuner test mode, the frequencies are initialized
in the memory as shown in Table 24. Refer to the microcomputer
test mode function on pages 19 and 23.
If the initialization is executed, the frequencies registered by
the user are changed.
When setting the tuner test mode, the frequencies are initialized
in the memory as shown in Table 24. Refer to the microcomputer
test mode function on pages 19 and 23.
If the initialization is executed, the frequencies registered by
the user are changed.
• FM Mute Level
FM Signal oscillator Frequency 400 Hz, 22.5 kHz
FM Signal oscillator Frequency 400 Hz, 22.5 kHz
98.0 MHz
98.0 MHz
VR351
Input: SO301A
(30 dB)
Output: Headphones
terminal
terminal
TUNER SECTION
Adjusting Item
AM IF
T351 Indication of
IF wavefome 450 kHz
set must be 1,620 kHz
is set to max.
AM Band
fL: T306 (522 kHz)
fL: 1.3V
±
0.1V
Coverage (Voltage Set Display of 522 kHz
fH: 8.5V
±
1.3V
of TP302 VT line)
(fH is only check)
AM Tracking
fL: T302 (990 kHz)
Set output of
Headphones terminal
to maximum.
Headphones terminal
to maximum.
Adjusting object
Adjusting method
Adjusting
method
Adjusting
object
Adjusting object
Adjusting
method
P01
87.50 MHz
P06
522 kHz
P02
108.00 MHz
P07
1,620 kHz
P03
90.00 MHz
P08
603 kHz
P04
106.00 MHz
P09
1,404 kHz
P05
98.00 MHz
P10
990 kHz
Figure 24-1 AM IF/RF
GND
AM Loop Antenna
AM signal oscillator
Loop Antenna
IF: Headphones
Frequency cover: TP301
Frequency cover: TP301
Electric
Voltmeter
Voltmeter
UNIT
Figure 24-4 Output Offset Lelel
GND
SO301A
Headphones
Terminal
Terminal
UNIT
Electric
Voltmeter
Voltmeter
FM signal oscillator
Figure 24-2 FM Mute Level
Figure 24-3 ADJUSTMENT POINT
Preset.
memory
FM
frequency
AM
frequency
Preset.
memory
• To erase the registered broadcast stations
When exiting from the test mode, all preset data is erased.
When exiting from the test mode, all preset data is erased.
Table 24
1-BIT AMP. SECTION
1-bit amp. output offset voltage adjustment
Applying AC 100V, adjust the VRA100/101 so that the voltage
between + and - of the speaker output terminal (BIA110) is
within 0
between + and - of the speaker output terminal (BIA110) is
within 0
±
5mV.
BIA110
AC 230V
+
-
VR: 0
Input: AUX
Input: AUX
Output:
Speaker
Terminal
Speaker
Terminal
Electric
Voltmeter
Voltmeter
UNIT
Figure 24-5 ADJUSTMENT POINT
BIA110
LFA04
LFA05
LFA03
QA100
VRA100
ICA110
ICA100
LFA02
LFA01
VRA101
ICA111
ICA112
ICA104
QA101
LFA06
BIA111
BIA106
BIA112
ICA101
ICA102
ICA103
1 BIT AMP. PWB
OUTPUT OFFSET
L-CH
L-CH
OUTPUT OFFSET
R-CH
R-CH
SO301A
ANTENNA
TERMINAL
C393
FE301
IC302
CF302
IC303
CF352
BI302
VR351
T351
T302
T306
TUNER PWB
AM BAND
COVERAGE
COVERAGE
AM IF
FM MUTE
LEVEL
LEVEL
TP301
TP302
AM
GND
FM
AM
TRACKING fL
TRACKING fL
C368
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