Sharp CD-C470E (serv.man3) Service Manual ▷ View online
– 45 –
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
• When the CD tray fails to open or close.
Is there following voltage input in specific state of IC801 pin 53?
Open state: 0V
Close state: 0V
Intermediate state between open state and close state: 5V
Intermediate state between open state and close state: 5V
Is H output to IC2 pin 24 or 25 for 7 seconds when the OPEN/
CLOSE key is pressed?IC91 is defective. Replace it.
CLOSE key is pressed?IC91 is defective. Replace it.
Is 4V output between IC91 pins 3 and 7 during operation
stated above?
stated above?
Check the loading motor (M1) and the loading mechanism.
Yes
Yes
Yes
No
No
IC2 defective.
No
Check the periphery of IC91.
IC91 defective.
OK
OK
Check the OPEN CLOSE SW and the wiring from the IC801
pin 53 to the OPEN CLOSE SW.
pin 53 to the OPEN CLOSE SW.
Check the wiring of the IC2 pins 24 and 25, IC91 pins 1 and 3.
• The CD function will not work.
The CD operating keys don't work.
Check the CD, DSP, power supply, and 16.93 MHz clock, and
reset terminal.
reset terminal.
Check the waveform of SCK, SO (DATA) and SI (COMM).
Yes
Yes
See if the pick-up is in the pick-up in PICKUP IN SW position.
If the items mentioned above are OK, check the main
microcomputer IC801.
microcomputer IC801.
Yes
Yes
No
Yes
No
• The CD operating keys work.
Check the Focus - HF system.
Playback can be performed without a disc.
Focus search OK
Does the pick-up move up and down twice?
Does the output waveform of IC1(16)(FD) match that shown in
Fig. 45?
Fig. 45?
Check the IC1(50)(CLK) line, 4MHz.
Check the microcomputer data on pins (51)(CL), (52)(DAT)
and (53)CE.
Check the microcomputer data on pins (51)(CL), (52)(DAT)
and (53)CE.
Check the area around IC5-CNP2.
Yes
Yes
Figure 45
Focus search is
performed two
times when play
operation is done
without disc.
performed two
times when play
operation is done
without disc.
0.5s
0.50 V
IC1 16 FD
0.50 V
IC1 16 FD
2
1
0.5s
0.50 V
IC1 7 TE
0.50 V
IC1 7 TE
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
– 46 –
• Playback can only be performed when a disc is
loaded.
Is HF waveform normal (see the Fig. 46-1, 2)?
Check the tracking system.
Is the Focus servo active? (Can you hear it working?)
Check the laser diode driver.
Check the area around IC1(16) - (21) (focus servo circuit).
Check the area around IC1(16) - (21) (focus servo circuit).
No
Yes
Yes
Yes
Does the DRF signal change from "L" to "H"?
No
Yes
If the disc is not turning, the DRF
should not change to "H".
should not change to "H".
Level is abnormal.
No
Yes
Waveform is unstable.
Check the spin system.
Yes
Check the periphery of
IC1 pins 41 and 42.
IC1 pins 41 and 42.
Check the spin system.
Figure 46-2
Figure 46-1
Waveform in case of
normal play-back
normal play-back
HF
1.0V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
1.0V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
3
2
1
1
4
0.5s
1.00 V
IC1 16 FD
1.00 V
IC1 16 FD
0.5s
10.0 V
IC2 13 CLV+
10.0 V
IC2 13 CLV+
0.5s
10.0 V
IC1 54 DRF
10.0 V
IC1 54 DRF
0.5s
2.00 V
IC1 7 TE
2.00 V
IC1 7 TE
• Check the tracking system.
Check waveform of IC1 pin 7 (TE).
Play is possible in
TEST mode.
TEST mode.
Although IL is possible,
play is impossible.
play is impossible.
Check the periphery
of IC 1 pin 14.
of IC 1 pin 14.
Normal jump is impeded,
and the program top
cannot be reached.
and the program top
cannot be reached.
Check the periphery of IC 1
pin 8 to pin 15, and IC 5 to
CNP2.
pin 8 to pin 15, and IC 5 to
CNP2.
The waveform shown in Fig.
46-3 appears, and no-disc
state appears soon.
46-3 appears, and no-disc
state appears soon.
Tracking servo is
inoperative.
inoperative.
Yes
Yes
Yes
Yes
Yes
Data cannot be read.
Check the VCO-PLL system.
Yes
3
4
5ms
1.00 V
IC1 7 TE
1.00 V
IC1 7 TE
5 ms
5.0 V
IC1 54 DRF
5.0 V
IC1 54 DRF
Figure 46-3
– 47 –
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
• Checking the spin system.
Yes
No
Play operation is performed without disc.
The turntable rotates a little.
The turntable fails to rotate or rotates at high speed.
Yes
The spin driver circuit is normal.
Check the periphery of IC1 pins 23 to 27, pin 39, and pin 40, IC2
pin 12 and pin 13, IC5 to CNP3.
pin 12 and pin 13, IC5 to CNP3.
Yes
• Checking the VCO-PLL system
Figure 47
Play operation is performed when disc exits.
Yes
Although HF waveform is normal, TOC data cannot be read.
Yes
Check PDO waveform (Fig. 47).
Abnormal
Check the IC1 pins 43 and 44, IC2 pins 3, 5, 7, 10, and 11.
Stop --> Play
As VCO freque-
ncy is locked at
4.32 M Hz, voltage
of PDO rises and
stabili- zes.
ncy is locked at
4.32 M Hz, voltage
of PDO rises and
stabili- zes.
2
3
0.5s
1.00 V
IC2 3 PDO
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC2 16 FD
1.00 V
IC2 16 FD
• Although HF waveform is normal and the time
indication is normal, no sound is emitted.
Check IC 2 pin 48 (EFLG).
Check IC2 pins 37, 40.
Check IC 501 and POWER AMP IC 901.
Abnomal
Yes
Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
or less.
No
CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
– 48 –
1
DEFI
Input
Input terminal of defect detection signal (DEF). (Connected to OV when not used.)
2
TAI
Input
For PLL
Input terminal for test. Pull-down resistor is integrated. Surely connected to 0V.
3
PDO
Output
Output terminal of phase comparison for external VCO control.
4
VVSS
—
Ground terminal for integrated VCO. Surely connected to 0V.
5
ISET
Input
Resistance connection terminal for current adjustment of PDO output.
6
VVDD
—
Power terminal for integrated VCO.
7
FR
Input
VCO frequency range adjustment.
8
VSS
—
Ground terminal of digital system. Surely connected to 0V.
9
EFMO
Output
For slice level control
EFM signal output terminal.
10
EFMIN
Input
EFM signal input terminal.
11
TEST2
Input
Input terminal for test. Pull-down resistor is integrated. Surely connected to 0V.
12
CLV+
Outout
Output for disk motor control. 3 values can be output with the commands.
13
CLV-
Output
Output for disk motor control. 3 values can be output with the commands.
14
V/P
Output
Monitor output terminal for automatic switch of rough servo/phase control.
"H" for rough servo, and "L" for phase servo.
"H" for rough servo, and "L" for phase servo.
15
HFL
Intput
Input terminal of track detection signal. Schmit input.
16
TES
Input
Input terminal of tracking error signal. Schmit input.
17
TOFF
Output
Tracking OFF output terminal.
18
TGL
Output
Output terminal for switch of tracking gain "L" increases the gain.
19
JP+
Output
Output for track jump control. 3 values can be output with the commands.
20
JP-
Output
Output for track jump control. 3 values can be output with the commands.
21*
PCK
Output
Clock monitor terminal for EFM data replay. 4,3218MHz as the phase clock.
22*
FSEQ
Output
Output terminal synchronous signal detection. "H" is output when synchronous signal detected
by EFM signal matches synchronous signal internally generated.
by EFM signal matches synchronous signal internally generated.
23
VDD
—
Power terminal of digital system.
24
CONT1
Input/Output
General purpose input/output terminal 1
25
CONT2
Input/Output
General purpose input/output terminal 2
26
CONT3
Input/Output
General purpose input/output terminal 3
27
CONT4
Input/Output
General purpose input/output terminal 4
28*
CONT5
Input/Output
General purpose input/output terminal 5
29*
EMPH
Output
Difference monitor terminal At "H", deemphasis disk is being replayed.
30*
C2F
Output
C2 flag output terminal.
31
DOUT
Output
Output terminal of digital OUTPUT. (EIAJ format)
32*
TEST3
Input
Input terminal for test. Pull-down resistor is integrated. Surely connected to 0V.
33
TEST4
Input
Input terminal for test. Pull-down resistor is integrated. Surely connected to 0V.
34*
N.C.
—
Terminal not used. Open during operation.
35*
MUTEL
Output
L channel 1 bit DAC
Mute output terminal for L channel.
36
LVDD
—
Power terminal for L channel.
37
LCHO
Output
L channel output terminal.
38
LVSS
—
Ground terminal for L channel Surely connected to 0V.
39
RVSS
—
R channel 1 bit DAC
Ground terminal for R channel Surely connected to 0V.
40
RCH0
Output
R channel output terminal.
41
RVDD
—
Power terminal for R channel.
42*
MUTER
Output
Mute output terminal for R channel.
43
XVDD
—
Power terminal for quartz oscillation.
44
XOUT
Output
Ground terminal of 16.9344 MHz quartz oscillator.
45
XIN
Input
Ground terminal of 16.9344 MHz quartz oscillator.
46
XVSS
—
Ground terminal for quartz oscillation. Surely connected to 0V.
47*
SBSY
Output
Output terminal of synchronous signal of subcode block.
48*
EFLG
Output
Correction monitor terminal of C1, C2, single and double.
FUNCTION TABLE OF IC
Pin No.
Function
Terminal Name
Input/Output
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Controlled with serial data command
from micro computer.
When not used, set it as the input terminal and
open it by connecting to 0V, or set it as the output
terminal and open it.
from micro computer.
When not used, set it as the input terminal and
open it by connecting to 0V, or set it as the output
terminal and open it.
IC2 VHiLC78623E-1:Servo/Signal Control(LC78623E) (1/2) (CD-C470H/C470E)
IC2 VHiLC78623D-1:Servo/Signal Control(LC78623D) (1/2) (CD-C480H)
IC2 VHiLC78623D-1:Servo/Signal Control(LC78623D) (1/2) (CD-C480H)
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