Sharp CD-C605H (serv.man3) Service Manual ▷ View online
CD-C605H
– 33 –
• When the CD tray fails to open or close.
Is there following voltage input in specific state of IC701 pin 39?
Open state: 0V
Close state: 0V
Intermediate state between open state and close state: 4.3V
Intermediate state between open state and close state: 4.3V
Is H output to IC2 pin 24 or 25 for 7 seconds when the OPEN/
CLOSE button is pressed? IC3 is defective. Replace it.
CLOSE button is pressed? IC3 is defective. Replace it.
Is 4V output between IC3 pins 38 and 39 during operation
stated above?
stated above?
Check the loading motor (M3) and the loading mechanism.
Yes
Yes
Yes
No
No
IC2 defective.
No
Check the periphery of IC3.
IC3 defective.
OK
OK
Check the OPEN/CLOSE switch and the wiring from the
IC701 pin 39 to the OPEN/CLOSE switch.
IC701 pin 39 to the OPEN/CLOSE switch.
Check the wiring of the IC2 pins 24 and 25, IC3 pins 38 and 39.
• The CD function will not work.
The CD operating buttons 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 PICKUP IN switch position.
If the items mentioned above are OK, check the main
microcomputer IC701.
microcomputer IC701.
Yes
Yes
No
Is there following voltage input on the IC701 pin 41 in the
specific state?
specific state?
In other states: 4.3V
When the CD mechanism is moved up: 0V
• When turntable fails to move.
Check the MECHA UP switch and the wiring from the IC701
pin 41 to the MECHA UP switch.
pin 41 to the MECHA UP switch.
Is 4V output from the Q51 emitter during operation stated
above?
above?
Yes
Yes
Check the wiring of IC2 pin 27 and Q51 pin 2.
OK
No
No
Is L output from the IC2 pin 27 during SEC when the disc skip
switch is pressed?
switch is pressed?
Yes
Check turntable motor and turntable mechanism.
Check Q51 and the periphery.
IC2 defective.
CD-C605H
– 34 –
• Playback can only be performed when a disc is
loaded.
Is HF waveform normal (see the Fig. 34-2, Fig. 34-3)?
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.
of IC1 pins 41 and 42.
Check the spin system.
Figure 34-3
Figure 34-2
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 12 CLV+
10.0 V
IC2 12 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
Waveform in
case of normal
playback
case of normal
playback
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. 34-1?
Fig. 34-1?
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 IC3-CNP2.
Yes
Yes
Figure 34-1
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
Focus search is
performed two
times when play
operation is done
without disc.
performed two
times when play
operation is done
without disc.
HF
1.0V/DIV
0.5
1.0V/DIV
0.5
˚
sec/DIV(DC)
(When playing
back the disc)
back the disc)
CD-C605H
– 35 –
• 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, IC3 to CNP3.
pin 12 and pin 13, IC3 to CNP3.
Yes
• Checking the VCO-PLL system
Figure 35-2
Play operation is performed when disc exits.
Yes
Although HF waveform is normal, TOC data cannot be read.
Yes
Check PDO waveform (Fig. 35-2).
Abnormal
Check the IC1 pins 43 and 44, IC2 pins 3, 5, 7, 10, and 11.
• Although HF waveform is normal and the time
indication is normal, no sound is emitted.
Check IC2 pin 48 (EFLG).
Check IC2 pins 37, 40.
Check IC401 and POWER AMP. IC601.
Abnomal
Yes
Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
or less.
No
2
3
0.5s
1.00 V
IC2 3 PDO
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC1 16 FD
1.00 V
IC1 16 FD
As VCO frequency
is locked at 4.32 MHz,
voltage of PDO rises and
stabilizes.
is locked at 4.32 MHz,
voltage of PDO rises and
stabilizes.
Stop --> Play
• Check the tracking system.
Check waveform of IC1 pin 7 (TE).
Play is possible in
TEST mode.
TEST mode.
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.
35-1 appears, and no-disc
state appears soon.
35-1 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
Figure 35-1
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
The unit will be initialized
in Normal mode,but it will
not playback..
in Normal mode,but it will
not playback..
CD-C605H
– 36 –
IC1 VHiLA9241M/-1: Servo Amp. (LA9241M) (1/2)
1
FIN2
Connection pin for photodiode of pickup.
RF signal is generated through addition with FIN pin, and FE signal is generated through subtraction.
RF signal is generated through addition with FIN pin, and FE signal is generated through subtraction.
2
FIN1
Connection pin for photodiode of pickup.
3
E
Connection pin for photodiode of pickup. TE signal is generated through subtraction with F pin.
4
F
Connection pin for photodiode of pickup.
5
TB
Pin for input of DC component of TE signal.
6
TE-
Pin to connect gain setting resistor of TE signal to TE signal.
7
TE
TE signal output pin.
8
TESI
TES (Track error sense) comparator input pin. TE signal is band-passed and input.
9
SCI
Input pin for shock detection.
10
TH
Pin to set time constant of tracking gain.
11*
N.C.
No connect.
12
TD-
Pin to compose tracking phase compensation constant between TD and VR pins.
13
TD
Pin to set tracking phase compensation.
14
JP
Pin to set amplitude of tracking jump signal (kick pulse).
15
TO
Tracking control signal output pin.
16
FD
Focusing control signal output pin.
17
FD-
Pin to compose focusing phase compensation constant between FD and FA pins.
18
FA
Pin to compose focusing phase compensation constant between FD-/FA-pins.
19
FA-
Pin to compose focusing phase compensation constant between FA and FE pins.
20
FE
Output pin of FE signal.
21
FE-
Pin to connect gain setting resistor of FE signal across TE pin.
22
AGND
GND for analog signal.
23
SP
Single end output for CV+ and CV- pin input.
24
SPI
Spindle amplifier input.
25
SPG
Pin to connect gain setting resistor in the 12cm mode of spindle.
26
SP-
Pin to connect spindle phase compensation constant together with SPD pin.
27
SPO
Spindle control signal output pin.
28
SLEO
Pin to connect thread phase compensation constant.
29
SLD
Thread control signal output pin.
30
SL-
Input pin of thread feed signal from microcomputer.
31
SL+
Input pin of thread feed signal from microcomputer.
32
JP-
Input pin of tracking jump signal from DSP.
33
JP+
Input pin of tracking jump signal from DSP.
34
TGL
Input pin of tracking gain control signal from DSP. TGL = Gain low at "H"
35
TOFF
Input pin of tracking off control signal from DSP. TOFF = Off at "H"
36
TES
Output pin of TES signal to DSP.
37
HFL
(HIGH FREQUENCY LEVEL) is used to judge whether main beam is positioned on the bit or on the mirror.
38
SLOF
Thread servo off control input pin.
39
CV-
Pin to input CLV error signal from DSP.
40
CV+
Pin to input CLV error signal from DSP.
41
RFSM
RF output pin.
42
RFS-
Pin to set gain of RF and set 3T compensation constant together with RFSM pin.
43
SLC
(SLICE LEVEL CONTROL) is the output pin to control of the level of the data slice with RF waveform DSP.
44
SLI
Input pin to control the level of data slice with DSP.
45
DGND
GND pin in the digital system.
46
FSC
Output pin for focus search smoothening capacitor.
47
TBC
(Tracking Balance Control) Pin to set EF balance variable range.
48*
NC
No connect.
Pin No.
Port Name
Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
FUNCTION TABLE OF IC
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