Sharp CD-C1W Service Manual page 13

TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency Frequency
Test Stage
Display
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
*2. Input: Anetnna, Output: TP301
• FM RF
Signal generator: 1 kHz, 40 kHz dev, FM modulated
Test Stage Frequency Frequency
Display
Band — 87.5 kHz
Coverage
RF 98 MHz 98 MHz
10 - 30 dB
*1. Input: Antenna, Output: TP301
*2. Input: Anetnna, Output: Speaker Terminal
R357
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Setting/
Instrument
Adjusting
Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
(fL): T307 *2
2.0 ± 0.1V
(fH): TC305 *2
7.7 ± 0.2 V
(fL): T308 *2
2.1 ± 0.1V
(fH): TC304 *2
7.7 ± 0.2V
T302 *1
(fL): T303 *1
(fH): TC303 *1
(fL): T304 *1
(fH): TC302 *1
Setting/
Instrument
Adjusting
Connection
Parts
(fL): LT02 *1
3.7 ± 0.1 V
LT01 *2
TUNER PWB
SW1 Band
Coverage
fL fH
T351 VR351
T307 TC305
AM IF
FM Mute
Level
T308 TC304
IC303
TP302
fH fL
SW1
Tracking
Figure 13 ADJUSTMENT POINTS
– 13 –
• Setting the Test Mode
Keeping the PAUSE button and TUNER button pressed, turn
on POWER. 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 Preset
MW
No. No.
1 87.50 MHz 6 531 kHz
2 108.00 MHz 7 1,602 kHz
3 90.00 MHz 8 603 kHz
4 106.00 MHz 9 1,404 kHz
5 98.00 MHz 10 990 kHz
21 ~ 40
• FM Detection
Signal generator: 10.7 MHz, FM sweep
Frequency Frequency
Test Stage
Display
IF 10.7 MHz 98 MHz
*1. Input: Antenna, Output: TP301
*2. Input: Anetnna, Output: Speaker Terminal
• FM Mute Level
Signal generator: 1kHz, 40 kHz dev., FM modulated
Frequency Frequency
Display
98.00 MHz 98.00 MHz
(25 dBµV)
*1. Adjust so that an output signal appears.
FM Band
Coverage
FM IF FM RF
LT02
TT01
LT01
SW2 Tracking
fH fL
TP301
TC302 T304
TC303 T303
T302
T306
fH
SW1
MW
MW Band
Tracking
Tracking
Coverage
CD-C1W,CP-C1W
Preset
Preset
SW1 SW2
No.
No.
11 3.2 MHz 16 9.5 MHz
12 7.3 MHz 17 21.85MHz
13 3.9 MHz 18 11.65 MHz
14 7.1 MHz 19 21.45 MHz
15 5.06 MHz 20 15.1 MHz
Setting/
Instrument
Adjusting
Connection
Parts
TT01 *1
(Turn the
core of trans-
former TT01
fully counter-
clock wise)
Adjusting Instrument
Parts Connection
VR351 *1 Input: Antenna
Output: Speaker
Terminal
SO301
ANTENNA
TERMINAL
fL