Sharp XL-3000V - Manual (Page 13)

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XL-3000V
ADJUSTMENT
TUNER SECTION
AM GND
FM
75
OHMS
ANTENNA
TERMINAL
SO301
T302
IC301
T306
T304
IC303
T351
L303
L302
VR351
TP301
FM Mute
Level
AM Band
Coverage fL
FM Band
Coverage fL
AM
Tracking fL
AM IF
FM IF
FM OSC.
FM ANT.
FM RF
IC302
20
TUNER PWB-A2
1
Adjusting
Parts
Display Frequency
• Setting the Test Mode
Keeping the FF/PRESET UP button and MEMORY/SET button
pressed, turn on ON/STAND-BY. Then, the frequency is
initially set in the memory as shown in Table. Call it with the
VOLUME UP/DOWN button to use it for adjustment and check
of tuner circuit.
Preset No. FM Preset No. AM
1 87.50 MHz 6 531 kHz
2 108.00 MHz 7 1,602 kHz
3 98.00 MHz 8 990 kHz
4 90.20 MHz 9 612 kHz
5 106.00 MHz 10 1,404 kHz
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
*1. Adjust so that an output signal appears.
Check Point Instrument
Connection
Display Frequency
87.5 MHz 87.5 MHz 3.4 V ± 0.1 V TP301
108 MHz 108 MHz 7.8 V
±
1.0 V TP301
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
98.00 MHz 98.00 MHz VR351*1 Input: SO301
(25
±
1 dB
µ
V) Output: Speaker
Terminal
Instrument
Connection
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected, Output: TP301
Frequency Frequency Display Setting/
Adjusting
Parts
Instrument
Connection
AM IF 450 kHz 1,602 kHz T351 *1
AM Band — 531 kHz (fL): T306 *2
Coverage 1.1 ± 0.1 V
AM 990 kHz 990 kHz (fL): T302 *1
Tracking
fL: Low-range frequency
fH: High-range frequency
Signal generator: 400 Hz, 30%, AM modulated
• AM IF/RF
Figure 13-1 ADJUSTMENT POINTS
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal
Frequency
FM Band — 87.50 MHz (fL): L303 *1
Coverage 3.4 ± 0.1 V
FM RF 98.00 MHz 98.00 MHz L302 *2
(10~30 db)
Signal generator: 1 kHz, 75 kHz dev., FM modulated
• FM RF
• FM Detection
Signal generator: 10.7 MHz, FM sweep generator
Display
Setting/
Adjusting
Parts
Instrument
Connection
Frequency
FM IF 10.7 MHz 98.0 MHz T304(Turn Input: Pin 1 of
the core of IC301
T304 fully
counter-
clockwise.)
Test
Stage
Frequency Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection