Sharp CD-C491H (serv.man4) Service Manual ▷ View online
– 13 –
CD-C491H
Figure 13-1
Figure 13-2
Figure 13-3
Figure 13-4
Figure 13-5
Figure 13-6
(E2) x4
ø3 x10mm
ø3 x10mm
(D3) x4
ø3x10mm
ø3x10mm
(F1) x1
ø3 x10mm
ø3 x10mm
(D3) x8
ø3x8mm
ø3x8mm
(E2) x1
ø3x8mm
ø3x8mm
(G4) x2
ø3x10mm
ø3x10mm
(G4) x1
ø3x10mm
ø3x10mm
(G3) x2
(G1) x2
(D1) x1
(G2) x1
(G3) x1
(G3) x1
(G2) x2
Rear Panel
Main PWB
Tuner PWB
Dolby PWB
Front Panel
(D2) x1
(C4) x1
(D1) x1
(E1) x1
(J2)x3
ø3x10mm
ø3x10mm
(J2)x2
ø3x6mm
ø3x6mm
( L3 )x1
ø3x10mm
ø3x10mm
Front Panel
( J2 ) x1
ø3x8mm
ø3x8mm
( H2 ) x1
ø3x10mm
ø3x10mm
( J1 ) x2
( J1 ) x1
( H1 ) x1
Power Amp. PWB
(K1)x4
ø4x8mm
ø4x8mm
(K1)x1
ø3x10mm
ø3x10mm
(K1)x1
ø3x10mm
ø3x10mm
Power Supply PWB
(M1)x3
ø3x10mm
ø3x10mm
(P1)x6
ø3x10mm
ø3x10mm
(N1)x1
ø3x10mm
ø3x10mm
Open
Headphones
PWB
PWB
Display
PWB
PWB
(L1)x2
(L2)x1
Washer
Tape Mechanism
Cassette
Holder (Left/Right)
Holder (Left/Right)
Front Panel
CD Switch PWB
(L3)x12
ø3x10mm
ø3x10mm
( R1 ) x1
ø3 x10mm
ø3 x10mm
( R1 ) x1
ø3 x10mm
ø3 x10mm
( Q1 ) x1
ø3 x10mm
ø3 x10mm
Turntable
Disc Tray
( Q2 ) x1
( R2 ) x1
( R2 ) x1
CD Player Unit
( S1 ) x1
ø3 x10mm
ø3 x10mm
( S2 ) x2
( S2 ) x2
CD Player Unit
CD Servo PWB
CD-C491H
– 14 –
CP-C491
1
Front Speaker
1. Net .......................... (A1) x1
14-2
2. Baffle Board ........... (A2) x1
3. Screw ..................... (A3) x2
4. Screw ..................... (A4) x4
5. Screw ..................... (A5) x2
3. Screw ..................... (A3) x2
4. Screw ..................... (A4) x4
5. Screw ..................... (A5) x2
STEP
REMOVAL
PROCEDURE
FIGURE
CP-C491
Figure 14-2
CP-SW491
Figure 14-3
CP-SW491
1
Sub woofer
1. Net .......................... (A1) x1
14-3
2. Duct Panel ............. (A2) x1
3. Screw ..................... (A3) x4
3. Screw ..................... (A3) x4
STEP
REMOVAL
PROCEDURE
FIGURE
Note:
The center and rear speakers can be easily disassembled.
Therefore the disassembling method is not discribed.
For details refer to the disassembling drawing in the Parts
Guide.
The center and rear speakers can be easily disassembled.
Therefore the disassembling method is not discribed.
For details refer to the disassembling drawing in the Parts
Guide.
Be careful when installing the CD changer mechanism.
Install the CD changer mechanism on the CD player base after
the shift lever has been set in the highest position.
Install the CD changer mechanism on the CD player base after
the shift lever has been set in the highest position.
Figure 14-1
( A3 ) x4
ø4 x16mm
Net
( A1 ) x1
( A1 ) x1
( A2 ) x1
Screwdriver
Woofer
( T1 ) x4
ø3 x12mm
ø3 x12mm
( U1 ) x1
ø2.6 x10mm
ø2.6 x10mm
CD Changer
Mechanism
Mechanism
CD Mechanism
Shift Lever
CD Player Base
Screw driver
Woofer
Woofer
Net
(A1)x1
Baffle Board
(A2)x1
Tweeter
Tweeter
Super
Tweeter
(A5)x2
ø3x10mm
(A3)x2
ø3x10mm
(A4)x4
ø4x16mm
– 15 –
CD-C491H
How to remove the pickup (See Fig. 15-2)
1. Remove the screws (B1) x 2 pcs., to remove the shaft (B2).
2. Remove the stop washer (B3) x 1 pc., to remove the gear
2. Remove the stop washer (B3) x 1 pc., to remove the gear
(B4).
3. Remove the pickup.
Figure 15-2
REMOVING AND REINSTALLING THE MAIN PARTS
CD MECHANISM SECTION
Perform steps 1, 2, 3, 15, 16, 17, 18 and 19 of the disassembly
method to remove the CD mechanism.
method to remove the CD mechanism.
How to remove the loading motor
(See Fig. 15-1)
(See Fig. 15-1)
1. Remove the screws (A1) x 2 pcs., to remove the loading
motor.
Figure 15-1
( A1 ) x2
ø2.6 x5mm
ø2.6 x5mm
Loading/Up/
Down Motor
Down Motor
Motor
PWB
PWB
( B1 ) x2
ø2.6 x6mm
ø2.6 x6mm
Shaft
( B2 ) x1
( B2 ) x1
Stop Washer
( B3 ) x1
( B3 ) x1
Gear
( B4 ) x1
( B4 ) x1
CD Mechanism
Pickup
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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