Sharp CD-BA160 (serv.man7) Service Manual ▷ View online
CD-BA160H/1700H
– 42 –
The tracking servo is not activated.
Check the peripheral circuits at pins 18 and 19 on IC1, pin 23 on
IC2, and CNS1A/B.
Check the peripheral circuits at pins 18 and 19 on IC1, pin 23 on
IC2, and CNS1A/B.
If the waveform shown in Figure 42-1 appears and soon after
NO DISC appears.
NO DISC appears.
(2) Tracking system check
Check the TE waveform at pin 18 on IC1.
A normal jump operation cannot be completed or the beginning of
the track cannot be found.
Check the around pin 23 on IC2.
the track cannot be found.
Check the around pin 23 on IC2.
"Initialization" is possible, but play is not possible.
Data cannot be read. Check the VCO-PLL system.
"Initialization" is not possible.
Figure 42-1
Figure 42-2
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
then try starting the play operation.
(3) Spin system check
The spin driver circuit is OK.
1. The turntable rotates a little. (Waveform drawing 42-2)
Check around pin 25 on IC2, pins 15 and 16 on IC3, and CNS3A/B.
2. The turntable doesn't rotate.
T
T
TE
DRF
Stopped
CH1=10V
DC 10:1
CH2=1V
DC 10:1
100ms/div
(100ms/div)
NORM:100kS/s
2
1
=Record Length=
Smoothing : ON
CH1 : 0.0V
CH2 : 0.00V
CH2 : 0.00V
Main : 100K
Zoom : 2K
Zoom : 2K
Mode : NORMAL
Type : EDGE CH1
Delay : 2.924ms
Hold off : 0.2us
Type : EDGE CH1
Delay : 2.924ms
Hold off : 0.2us
CH3 : 0.00V
CH4 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger=
=Filter=
=Offset=
T
T
FDO
SPDO
Stopped
CH1=200mV
DC 10:1
CH2=500mV
DC 10:1
500ms/div
1999/04/07 09:51:15
(500ms/div)
NORM:20kS/s
2
1
=Record Length=
Smoothing : ON
CH1 : 0.000V
CH2 : 0.000V
CH2 : 0.000V
Main : 100K
Zoom : 2K
Zoom : 2K
Mode : NORMAL
Type : EDGE CH2
Delay : 2.924ms
Hold off : 0.2us
Type : EDGE CH2
Delay : 2.924ms
Hold off : 0.2us
CH3 : 0.00V
CH4 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger=
=Filter=
=Offset=
Yes
No
Yes
No
Yes
No
– 43 –
CD-BA160H/1700H
Is pin 35 (C2F) on IC2 "L"?
Yes
No
The HF waveform is normal and the time is displayed
normally, but no sound is produced. Or the sound has
dropouts.
normally, but no sound is produced. Or the sound has
dropouts.
(5) Others
There are too many error flags on a damaged disc which
makes error correction impossible.
makes error correction impossible.
Check again using a known good disc.
1. When playing at normal speed
Check the peripheral circuit at pin 37 (DOUT) on IC2 and
the waveform (Figure 43-2).
the waveform (Figure 43-2).
If OK, Check the Unit.
When a disc is loaded, start play operation.
(4) PLL system check
The HF waveform is normal, but the TOC data cannot be
read.
read.
Check the PDO waveform. (Figure 43-1)
Check around pins 1~6 on IC2.
Figure 43-1
Figure 43-2
T
FDO
PDO2
PDO1
Stopped
CH1=500mV
DC 10:1
CH3=1V
DC 10:1
CH4=1V
DC 10:1
500ms/div
(500ms/div)
NORM:20kS/s
1
4
3
=Record Length=
Smoothing : ON
CH1 : 0.000V
CH2 : 0.0V
CH2 : 0.0V
Main : 100K
Zoom : 2K
Zoom : 2K
Mode : AUTO
Type : EDGE CH2
Delay : 0.0ns
Hold off : 0.2us
Type : EDGE CH2
Delay : 0.0ns
Hold off : 0.2us
CH3 : 0.00V
CH4 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500mV
v/DIV
500mV
1999/04/05 17:33:17
T
T
DOUT
Stopped
CH1=2V
DC 10:1
500ns/div
1999/04/07 09:25:28
(500ns/div)
NORM:200MS/s
1
=Record Length=
Smoothing : ON
CH1 : 0.00V
CH2 : 0.00V
CH2 : 0.00V
Main : 1K
Zoom : 100
Zoom : 100
Mode : NORMAL
Type : EDGE CH1
Delay : 2.887ms
Hold off : 0.2us
Type : EDGE CH1
Delay : 2.887ms
Hold off : 0.2us
CH3 : 0.00V
CH4 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger=
=Filter=
=Offset=
CD-BA160H/1700H
– 44 –
FUNCTION TABLE OF IC
Figure 44 BLOCK DIAGRAM OF IC
IC1 VHiLA9235M/-1: Servo Amp. (LA9235M)
IC2 VHiLC78641E-1: Servo/Signal Control (LC78641E)
REF
LA9235M
REF
REF
REF
REF
REF
REF
REF
REF
AGCON
ODRV
AGCON
ODRV
REF
REF
LPF
LPF
APC
ODRV
REF
REF
REF
REF
LPF
PH/BH
PH
BH
1
30
FIN1
VCC
2
29
FIN2
RFSW(NC)
3
TIN1
4
27
TIN4
RF
26 N/C
25 PH
24 BH
23 GND
5
REF1
15
16
TES1
14
TESTO(NC)
13
EFBL
12
AGON
11
ODRV
10
LDON
9
GND
8
LDD
7
PD
6
VREF
TEST(NC)
17 HFL
18 TE
19 TE-
20 FE
21 FE-
22 RFEV
28 RF-
1
PDO1
2
PDO2
3
VVSS
4
PCKIST
5
VVDD
6
FR
7
HFL
8
SLCIST
9
SLCO
10
EFMIN
11
(NC)JITTV
12
JITTC
13
BH
14
PH(RFENV)
15
FE
16
TE
25
SPDO
26
SLDO
27
FG(D_Vref)
28
LASER
29
CONT1
30
CONT2
CONT3
CONT4
CONT5
31
32
33
34
(NC)PCK
35
(NC)C2F
36
VDD
37
DOUT
38
(NC)FSX
39
(NC)EFLG
40
TEST
EFMO(NC)
DEFECT(NC)
FSEQ(NC)
V/P(NC)
CONT7
CONT6
VSS
VDD5V
DEF
RES
WRQ
INT
DO
DI
CL
CE
17
VREF
18
ADAVDD
19
ADAVSS
20
(NC)PHREF
21
(NC)BHREF
22
TBLO
23
TDO
24
FDO
SBCK
PW(NC)
SBSY(NC)
SFSY(NC)
16M(NC)
DATA(NC)
DATACK(NC)
LRSY(NC)
ASDACK
ASLRCK
ASDFIN
XVSS
XOUT
XIN
XVDD
RVDD
RCHO
RVSS
LVSS
LCHO
LVDD
MUTER(NC)
MUTEL(NC)
EMPH(NC)
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
61
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
LC78641E
(NC)
– 45 –
CD-BA160H/1700H
IC2 VHiLC78641E-1: Servo/Signal Control (LC78641E) (1/2)
1
PDO1
Output
–
For PULL
Phase-comparison output terminal for built-in VOC control.
2
PDO2
Output
–
Phase-comparison output terminal for built-in VOC control.
Rough servo : OFF, phase servo : ON.
Rough servo : OFF, phase servo : ON.
3
VVSS
–
–
Ground terminal for built-in VCO.
4
PCKIST
AI
–
Resistor terminal for setting the PDO output current.
5
VVDD
–
–
Power terminal for built-in VCO.
6
FR
AI
–
Resistor terminal for setting the VCO frequency range.
7
HFL
Input
–
Mirror detection signal input terminal.
8
SLCIST
AI
–
For slice level control
Resistance connection terminal for current adjustment of
SLCO output.
SLCO output.
9
SLCO
Output
–
Control output.
10
EFMIN
Input
–
EFM signal input terminal.
11*
JITTV
Output
Unfixed
Jitter detection/monitor terminal.
12
JITTC
Output
–
Jitter detection/adjustment terminal.
13
BH
Input
–
BH signal input terminal. A/D input.
14
PH(RFENV)
Input
–
PH signal or RFENV signal input terminal. A/D input.
15
FE
Input
–
FE signal input terminal. A/D input.
16
TE
Input
–
TE signal input terminal. A/D input.
17
VREF
Input
–
VREF signal input terminal. A/D input.
18
ADAVDD
–
–
AD for servo, D/A power terminal.
19
ADAVSS
–
–
AD for servo, D/A ground terminal.
20*
PHREF
Output
(1/2VDD)
PH reference output terminal. D/A output.
21*
BHREF
Output
(1/2VDD)
BH reference output terminal. D/A output.
22
TBLO
Output
(1/2VDD)
Output terminal for tracking balance. D/A output.
23
TDO
Output
(1/2VDD)
Output terminal for tracking control. D/A output.
24
FDO
Output
(1/2VDD)
Output terminal for focus control. D/A output.
25
SPDO
Output
(1/2VDD)
Output terminal for spindle control. D/A output.
26
SLDO
Output
(1/2VDD)
Output terminal for sled control. D/A output.
27*
FG
Input
–
FG signal input terminal. (When not used,connect to 0V)
28
LASER
Output
L
LASER ON/OFF control terminal.
29
CONT1
In/Output
Input mode
General purpose input/output terminal 1.
Controlled with serial data command
30
CONT2
In/Output
Input mode
General purpose input/output terminal 2.
from microcomputer. When not used,
31
CONT3
In/Output
Input mode
General purpose input/output terminal 3.
set it as the input terminal and
32
CONT4
In/Output
Input mode
General purpose input/output terminal 4.
open it by connecting to 0V, or set it
33
CONT5
In/Output
Input mode
General purpose input/output terminal 5.
as the output terminal and open it.
34*
PCK
Output
H
Clock monitor terminal for EFM data replay. 4.3218MHz as phase clock.
35*
C2F
Output
H
C2 flag output terminal.
36
VDD
–
–
Power terminal of digital system.
37
DOUT
Output
L
Output terminal of digital OUT. (EIAJ format)
38*
FSX
Output
L
Output terminal of synchronous signal of 7.35kHz divided from quartz oscillation.
39*
EFLG
Output
L
C1,C2 correct monitor terminal.
40
TEST
Input
–
Input terminal for test. Surely connected to 0V.
41*
EMPH
In/Output
Input mode
Emphasis terminal. After resetting, it is configured as an input terminal. It can be controlled
from the outside. It is also becomes a emphasis monitor terminal under command control.
from the outside. It is also becomes a emphasis monitor terminal under command control.
42*
MUTEL
Output
H
Mute output terminal for L channel.
43*
MUTER
Output
H
Mute output terminal for R channel.
Pin No.
Function
Terminal Name Input/Output Setting in Reset
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
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