Tuner Section - Sharp GX-CD5100W Service Manual

[3]TUNER SECTION

fL: Low-range frequency
fH: High-renge frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency
Test Stage Frequency
IF 450 kHz 1,602 kHz
MW Band — 531 kHz
Coverage
SW1 Band — 3.2 MHz
Coverage
SW1 Band — 7.3 MHz
Coverage
SW2 Band — 9.5 MHz
Coverage
SW2 Band — 21.85 MHz
Coverage
MW 990 kHz 990 kHz
Tracking
SW1 3.9 MHz 3.9 MHz
Tracking
SW1 7.1 MHz 7.1 MHz
Tracking
SW2 11.65 MHz 11.65 MHz
Tracking
SW2 21.45 MHz 21.45 MHz
Tracking
*1. Input: Antenna, Output: TP302
Antenna,
*2. Input: Output: TP301
• FM RF
Signal generator: 1 kHz, 40 kHz dev, FM modulated
Test Stage Frequency Frequency
Band — 87.5 kHz
Coverage
RF 98 MHz 98 MHz
10 - 30 dB
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal
TP302
Figure 2 MAIN PWB (BOTTOM VIEW)
Setting/
Instrument
Adjusting
Display
Connection
Parts
L311 *1
(fL): L312 *2
1.1 ± 0.1 V
(fL): L310 *2
2.2 ± 0.1V
(fH): TC304 *2
7.8 ± 0.2 V
(fL): L309 *2
2.1 ± 0.1V
(fH): TC303 *2
7.7 ± 0.2V
L303 *1
(fL): L302 *1
(fH): TC302 *1
(fL): L301 *1
(fH): TC301 *1
Setting/
Instrument
Display Adjusting
Connection
Parts
(fL): L315 *1
1.3 ± 0.1 V
L316 *2
• Setting the Test Mode
Keeping the T1(STOP) button and T2(STOP) button, pressed
TUNER button. Then, the frequency is initially set in the memory
as shown in Table. Call it with the PRESET button to use it for
adjustment and check of tuner circuit.
Preset FM
No.
1 87.50 MHz
2 108.00 MHz
3 90.00 MHz
4 106.00 MHz
5 98.00 MHz
21 ~ 40
• FM Detection
Signal generator: 10.7 MHz, FM sweep
Frequency Frequency
Test Stage
IF 10.7 MHz
*1. Input: Antenna, Output: TP301
*2. Input: Anetnna, Output: Speaker Terminal
• FM Mute Level
Signal generator: 1kHz, 40 kHz dev., FM modulated
Frequency
98.00 MHz 98.00 MHz
(25 dBm V)
*1. Adjust so that an output signal appears.
TUNER SECTION
TP301
SW1 BAND COVERAGE
fL
FM MUTE
LEVEL
fL fH
SW2 BAND COVERAGE
COVERAGE
Figure 1 ADJUSTMENT POINTS
2 – 2
Preset Preset
MW
SW1
No.
No.
6 531 kHz 11 3.2 MHz
7 1,602 kHz 12 7.3 MHz
8 603 kHz 13 3.9 MHz
9 1,404 kHz 14 7.1 MHz
10 990 kHz 15 5.06 MHz
* SPAN 50 kHz
Setting/
Display Adjusting
Parts
98 MHz L317
(Turn the
core of trans-
former
fully counter-
clock wise)
Adjusting
Frequency
Parts
Display
VR301 *1
FM BAND
FM IF FM RF
COVERAGE
SW2 TRACKING
fH fL
fH
MW TRACKING
MW BAND
fH fL
SW1 TRACKING
GX-CD5100W
Preset
SW2
No.
16 9.5 MHz
17 21.85 MHz
18 11.65 MHz
19 21.45 MHz
20 15.1 MHz
Instrument
Connection
*1
L317
Instrument
Connection
Input: Antenna
Output: Speaker
Terminal
TO
ROD ANTENNA
CNP301
ANTENNA
TERMINAL