CD-C420H - Sharp Audio Service Manual (repair manual). Page 10

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CD-C405W/CD-C420H/CP-C410/CP-C405/CP-SR421
– 10 –
MECHANISM SECTION
 Driving Force Check
Torque Meter
Specified Value
Play: TW-2412
Tape 1: Over 80 g
Tape 2: Over 80 g
 Torque Check
Torque Meter
Tape 2
Play: TW-2111
30 to 60 g. cm
30 to 60 g.cm
Fast forward: TW-2231
60 to 120 g.cm
Rewind: TW-2231
60 to 120 g.cm
Specified
Value
Adjusting
Point
Instrument
Connection
Test Tape
Tape
MTT-111
Volume in
3,000 
±
Speaker
speed
motor.
30 Hz
terminal
(Load
resistance:
8 ohms)
Specified Value
Tape 1
 Tape Speed
ADJUSTMENT
• 
 AM IF/RF (CD-C405W)
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna,
Output: TP302
*2. Input: Input is not connected,
Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
IF
450 kHz
1,602 kHz
T351
*1
Band
531 kHz
(fL): T302
*2
Coverage
1.1 
±
 0.1 V
Tracking
990 kHz
990 kHz
(fL): T302
*1
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
• 
 AM IF/RF (CD-C420H)
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna,
Output: TP302
*2. Input: Input is not connected,
Output: TP301
IF
450 kHz
1,620 kHz
T351
*1
Band
522 kHz
(fL): T302
*2
Coverage
1.1 
±
 0.1 V
Tracking
990 kHz
990 kHz
(fL): T302
*1
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
  Setting the Test Mode
Keeping the TUNING (DOWN) button and MEMORY 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.
1
87.50 MHz
6
522 kHz
2
108.00 MHz
7
1,620 kHz
3
90.00 MHz
8
603 kHz
4
106.00 MHz
9
1,404 kHz
5
98.00 MHz
10
990 kHz
11 ~ 40
Preset No.
FM
Preset No.
AM
Adjusting
Parts
Instrument
Connection
Frequency
Display
Frequency
98.00 MHz
98.00 MHz
VR351 *1
Input: SO301
(25 dB
µ
V)
Output: Speaker
   Terminal
 FM Mute Level
Signal generator: 1 kHz, 40 kHz dev. FM modulated.
*1. Adjust so that an output signal appears
TUNER PWB
AM BAND
COVERAGE fL
ANTENNA
TERMINAL
T351
L311
CNP301
T302
FE301
VR351
FM MUTE
LEVEL
AM IF
IC303
AM TRACKING
 fL
SO301
S0301
ANTENNA
TERMINAL
CD-C420H
CD-C405W
TP301
TP302
R331
Figure 10-1 ADJUSTMENT POINTS
TAPE MECHANISM
MM 1
Motor
Volume in motor
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