Sharp CD-C470E (serv.man3) Service Manual ▷ View online
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
– 10 –
Figure 10-2
How to remove the pickup (See Fig. 10-2)
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.
REMOVING AND REINSTALLING THE MAIN PARTS
CD MECHANISM SECTION
Perform steps 1, 2, 3, 14 and 15 of the disassembly method
to remove the CD mechanism.
to remove the CD mechanism.
How to remove the turntable up/down motor
(See Fig. 10-1)
(See Fig. 10-1)
1. Remove the screws (A1) x 2 pcs., to remove the turntable
up/down motor.
Figure 10-1
( B1 ) x2
2.6 x6mm
2.6 x6mm
Shaft
( B2 ) x1
( B2 ) x1
Stop Washer
( B3 ) x1
( B3 ) x1
Gear
( B4 ) x1
( B4 ) x1
CD Mechanism
Pickup
( A1 ) x2
ø2 x5mm
ø2 x5mm
Turntable Up/Down Motor
– 11 –
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
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
ADJUSTMENT
Specified Value
Tape 1
• Tape Speed
fL: Low-range frequency
fH: High-renge frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
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
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 dB
µ
V)
Output: Speaker
Terminal
Terminal
Figure 11-1 ADJUSTMENT POINTS
TUNER SECTION
*1. Input: Antenna,
Output: TP302
*2. Input: Antenna,
Output: TP301
VRM1
TAPE
SPEED
SPEED
TAPE MECHANISM PWB
TUNER PWB
TP301
CNP301
SO301
ANTENNA
TERMINAL
ANTENNA
TERMINAL
FE301
TP302
R357
T351
T306
T305
T302
T301
VR351
AM IF
FM MUTE
LEVEL
LEVEL
MW BAND
COVERAGE
COVERAGE
MW
TRACKING
TRACKING
LW
TRACKING
TRACKING
LW BAND
COVERAGE
COVERAGE
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
– 12 –
TEST MODE
2
1
TO
TE
200 ms
1V/diV
IC 1 15
1V/diV
IC 1 15
200 ms
1V/diV
IC 1 7
1V/diV
IC 1 7
TRACKING/
ERROR
BARANCE
ADJUST
ERROR
BARANCE
ADJUST
Figure 12-2
Figure 12-3
2
1
10ms
0.50 V
IC1 20 FE
0.50 V
IC1 20 FE
10ms
0.50 V
IC1 7 TE
0.50 V
IC1 7 TE
Enlarged
View
View
TRACKING
OFF-SET
ADJUST
OFF-SET
ADJUST
Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
• Automatic adjustment item
1. Focus offset (Fig. 12-2)
2. Tracking offset (Fig. 12-3)
3. E/F balance (tracking error balance) (Fig. 12-4)
4. RF level AGC function (HF level: constant)
5. RF level automatic follow-up of the tracking gain
1. Focus offset (Fig. 12-2)
2. Tracking offset (Fig. 12-3)
3. E/F balance (tracking error balance) (Fig. 12-4)
4. RF level AGC function (HF level: constant)
5. RF level automatic follow-up of the tracking gain
This automatic adjustment is performed each time a disc is changed. Therefore,
each disc is played back using the optimal settings.
each disc is played back using the optimal settings.
CD SECTION
Figure 12-1
Note:
Only in STOP state it is possible to slide the pickup with the (
) or (
) key.
VOL. --- Last memory
BAL. --- CENTER
R.GEQ. --- FLAT
X-BAS --- OFF
BAL. --- CENTER
R.GEQ. --- FLAT
X-BAS --- OFF
Canceling method - POWER OFF
• Setting the test mode
Any one of test mode can be set by pressing several keys as follows.
<REC. PAUSE> + <CD> + <POWER> TEST: CD operation test
• TEST mode
Function — CD test mode
Any one of test mode can be set by pressing several keys as follows.
<REC. PAUSE> + <CD> + <POWER> TEST: CD operation test
• TEST mode
Function — CD test mode
Setting of TEST mode
Indication of CD TST mode (Fig. 12-1)
OPEN/CLOSE operation is manual operation.
The pickup can be moved by using the (
) or (
) key.
<MEMORY>
LASER ON
LASER ON
<PLAY> key input
Press <STOP> key.
Stop
TOC. IL is performed, and the ordinary PLAY is performed.
If the following key is pressed during PLAY, it is possible
to specify directly any Track No.
<Disc Number 1> key: Track 4
<Disc Number 2> key: Track 9
<Disc Number 3> key: Track 15
If the following key is pressed during PLAY, it is possible
to specify directly any Track No.
<Disc Number 1> key: Track 4
<Disc Number 2> key: Track 9
<Disc Number 3> key: Track 15
<MEMORY>
Tracking on the spot.
SERVO OFF PLAY
Tracking on the spot.
SERVO OFF PLAY
<MEMORY>
Tracking on the spot.
SERVO ON PLAY
SERVO ON PLAY
STOP
2
0.1s
0.50 V
IC1 20 FE
0.50 V
IC1 20 FE
0.1s
0.50 V
IC1 7 TE
0.50 V
IC1 7 TE
1
FOCUS
OFF-SET
ADJUST
OFF-SET
ADJUST
TRACKING
OFF-SET
ADJUST
OFF-SET
ADJUST
Figure 12-4
IL is not performed.
<STOP>
– 13 –
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
SP out
L-ch
Input signal is output.
(SO901)
R-ch
Input signal is output.
(SO903) SP out C-ch
SP cut, no output
(SO902) SP out S-ch
Almost no output (only omitting component)
SP out
L-ch
Almost no output (only omitting component)
(SO901)
R-ch
Almost no output (only omitting component)
(SO903) SP out C-ch Input signal is output.
(SO902) SP out S-ch
Almost no output (only omitting component)
State of set Dolby Pro Logic
Dolby Pro Logic On mode
Output point
Bypass mode
Normal mode
Phantom mode
IC202
16 pin L-out
Output enabled state
Output enabled state
Output enabled state
15 pin R-out
Output enabled state
Output enabled state
Output enabled state
IC201
34pin C-out
No output
Output enabled state
No output
IC202
13pin S-out
No output
Output enabled state
Output enabled state
SP OUT
L-ch
Output enabled state
Output enabled state
Output enabled state
(SO901)
R-ch
Output enabled state
Output enabled state
Output enabled state
SP OUT C-ch
No output in MUTE (Q504) state
Output enabled state
No output in MUTE (Q504) state
(SO903)
SP OUT S-ch
No output in MUTE (Q503) state
Output enabled state
Output enabled state
(SO902)
EXPLANATION OF DOLBY SURROUND PRO LOGIC AND EVALUATION METHOD
Test tone output
• Pro Logic ON Normal mode
Press the remote control TEST TONE button.
• Pro Logic ON Normal mode
Press the remote control TEST TONE button.
→
Output of only L-ch
→
Output of only C-ch
↑
↓
Output of only S-ch
←
Output of only R-ch
The test tone (noise) is repeatedly output for output period
(2 sec).
In this case the following indication appears repeatedly.
(2 sec).
In this case the following indication appears repeatedly.
→
TEST
→
L-ch
→
C-ch
↑
↓
S-ch
←
R-ch
• Pro Logic ON Phantom mode
Press the remote control TEST TONE button.
Press the remote control TEST TONE button.
→
Output of only L-ch
→
Output of only R-ch
↑
↓
←
Output of only S-ch
The test tone (noise) is repeatedly output for output period
(2 sec).
(2 sec).
In this case the following indication appears repeatedly.
→
TEST
→
L-ch
→
R-ch
↑
↓
←
S-ch
←
Outline
• Namely, two speakers are connected in parallel to one
amplifier.
• In the Pro Logic BYPASS mode the amplifier for C-ch (center
channel) and the amplifier for S-ch (surround channel) are in
MUTE state. The SP output is cut.
MUTE state. The SP output is cut.
• In the normal mode of Pro Logic ON mode the amplifiers for
C-ch and S-ch are in operative state, so that the SP output
appears.
appears.
• In the Phantom mode of Pro Logic ON mode the amplifier for
C-ch is in MUTE state, so that the SP output is cut. The
amplifier for S-ch (surround) is in operative state, so that the
SP output appears
amplifier for S-ch (surround) is in operative state, so that the
SP output appears
•
State of element output and terminal output in specific mode
Relation between VIDEO IN input and output in Pro Logic
ON state
(1) L-ch/R-ch same phase input into VIDEO IN input jack in
ON state
(1) L-ch/R-ch same phase input into VIDEO IN input jack in
VIDEO Function mode
Output point
Normal mode
Output point
Phantom mode
(2) L-ch/R-ch reverse phase input into VIDEO IN input jack in
VIDEO Function mode
(Reverse phase: Phase difference between L and R is 180
°
)
Output point
Normal mode
SP out
L-ch
Almost no output (only omitting component)
(SO901)
R-ch
Almost no output (only omitting component)
(SO903) SP out C-ch
Almost no output (only omitting component)
(SO902) SP out S-ch
Input signal is output.
Output point
Phantom mode
SP out
L-ch
Almost no output (only omitting component)
(SO901)
R-ch
Almost no output (only omitting component)
(SO903) SP out C-ch
SP cut, no output
(SO902) SP out S-ch
Input signal is output.
• Accordingly, if you want to output signal waveform to C-ch SP
out, give the same phase input into L-ch/R-ch INPUT in the
Pro Logic Normal mode.
Pro Logic Normal mode.
If one of channels receives input, C-ch does not output. Only
L-ch or R-ch outputs.
• If you want to output signal waveform to S-ch SP out, you can
use either Normal mode or Phantom mode. However, 180
°
reverse phase input must be given to L-ch/R-ch INPUT.
Click on the first or last page to see other CD-C470E (serv.man3) service manuals if exist.