Read Sharp CD-C491H (serv.man4) Service Manual online
CD-C491H
– 16 –
MECHANISM SECTION
•
Driving Force Check
Torque Meter
Specified Value
Play: TW-2412
Tape 1: Over 80 g
Tape 2: Over 80 g
Tape 2: Over 80 g
•
Torque Check
Torque Meter
Tape 2
Play: TW-2111
30 to 60 g. cm
30 to 100 g.cm
Fast forward: TW-2231
—
50 to 100 g.cm
Rewind: TW-2231
—
50 to 100 g.cm
Specified
Value
Adjusting
Point
Instrument
Connection
Test Tape
Normal
MTT-111
VRM1
3,000 ±
Speaker
speed
30 Hz
terminal
(Load
resistance:
8 ohms)
(Load
resistance:
8 ohms)
ADJUSTMENT
Specified Value
Tape 1
•
Tape Speed
Figure 16-2 ADJUSTMENT POINTS
Figure 16-1
•
AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna,
Output: TP302
*2. Input: Antenna,
Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
fH: High-renge frequency
IF
450 kHz
1,620 kHz
T351
*1
MW Band
—
522 kHz
(fL): T306
*2
Coverage
1.1 ± 0.1 V
MW
990 kHz
990 kHz
(fL): T302
*1
Tracking
LW Band
—
153 kHz
(fL): T305
*2
Coverage
1.5 ± 0.1 V
LW
225 kHz
225 kHz
(fL): T301
*1
Tracking
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
• FM
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
Manual. It is because the IF coil in the FM front end section
has been best adjusted in the factory so that its further
adjustment is not needed at the field. When replacing the
FM front end assembly, no adjustment is needed either.
has been best adjusted in the factory so that its further
adjustment is not needed at the field. When replacing the
FM front end assembly, no adjustment is needed either.
2: The parts in the FM front end section are prepared in a
complete unit, so you can't obtain each part individually
Adjusting
Parts
Instrument
Connection
Frequency
Display
Frequency
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Signal generator: 1 kHz, 40 kHz dev., FM modulated
98.00 MHz
98.00 MHz
VR351*
Input: Antenna
(25 dBµV)
Output: Speaker
Terminal
Terminal
VRM1
TAPE
SPEED
SPEED
FAS
SW
SW
SWM1
TAPE MECHANISM PWB
TP302
TP301
R336
R357
L354
T351
VR351
T306
T305
T302
T301
AM IF
IC303
FE301
FM MUTE
LEVEL
LEVEL
MW BAND
COVERAGE
COVERAGE
LW BAND
COVERAGE
COVERAGE
MW
TRACKING
TRACKING
LW
TRACKING
TRACKING
CNP303
TUNER PWB
SO301
FM ANTENNA
TERMINAL
FM ANTENNA
TERMINAL
CNP301
MW/LW
LOOP ANTENNA
TERMINAL
MW/LW
LOOP ANTENNA
TERMINAL
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