Sharp GX-CD5100W, Service Manual

Page: 9 / 84

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