Adjustment - Sharp XL-3000W Service Manual

TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency Frequency Display
AM IF 450 kHz 1,602 kHz
AM Band — 531 kHz
Coverage
AM 990 kHz 990 kHz
Tracking
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected,
• FM Detection
Signal generator: 10.7 MHz, FM sweep generator
Test Frequency Frequency
Display
Stage
FM IF 10.7 MHz 98.0 MHz
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Frequency
Frequency
Display
FM Band — 87.50 MHz
Coverage
FM RF 98.00 MHz 98.00 MHz
(10~30 db)
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal

ADJUSTMENT

Setting/
Instrument
Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
(fL): T302 *1
Output: TP301
Setting/
Instrument
Adjusting Connection
Parts
T304(Turn Input: Pin 1 of
the core of IC301
T304 fully
counter-
clockwise.)
Setting/ Instrument
Adjusting
Connection
Parts
(fL): L303 *1
3.4 ± 0.1 V
L302 *2
– 13 –
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
98.00 MHz 98.00 MHz
(25±1 dBµV)
*1. Adjust so that an output signal appears.
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
87.5 MHz 87.5 MHz
108 MHz 108 MHz
• Setting the Test Mode
Keeping the FF/FWD 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
1 87.50 MHz
2 108.00 MHz
3 98.00 MHz
4 90.20 MHz
5 106.00 MHz
TUNER PWB-A2
FM
75
SO301
OHMS GND
ANTENNA
TERMINAL
TP301
IC301
20
IC302
FM OSC. L303
FM Band
Coverage fL
VR351
FM Mute
Level
T351
AM IF
Figure 13-1 ADJUSTMENT POINTS
XL-3000W
Adjusting
Instrument
Parts
Connection
VR351*1 Input: SO301
Output: Speaker
Terminal
Check Point Instrument
Connection
3.4 V ± 0.1 V
TP301
7.8 V ± 1.0 V
TP301
Preset No. AM
6 531 kHz
7 1,602 kHz
8 990 kHz
9 612 kHz
10 1,404 kHz
AM
FM ANT.
FM RF
1
L302
T302
AM
T304
Tracking fL
FM IF
T306
AM Band
IC303
Coverage fL