DOWNLOAD Sharp CD-DP900 (serv.man27) Service Manual ↓ Size: 4.32 MB | Pages: 76 in PDF or view online for FREE

– 53 –

FDO

SPDO

Stopped

µ

TE

DRF

Stopped

µ

The tracking servo is not activated.
Check the peripheral circuits at pins 14, 15 and 20 on IC1, and
CNS1A/B.

If the waveform shown in Figure 53-1 appears and soon after
NO DISC appears ?

A normal jump operation cannot be completed or the beginning of
the track cannot be found.
Check the around pin 20 on IC1.

"Initialization" is possible, but play is not possible ?

Data cannot be read. Check the VCO-PLL system.

"Initialization" is not possible.

Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.

The spin driver circuit is OK.

1. The turntable rotates a little ? (Waveform drawing

Figure 53-2)

Check around pin 22 on IC1, pins 15 and 16 on IC2, and CNS3A/B.

2. The turntable doesn't rotate.

No

Yes

No

Yes

Yes

No

– 54 –

DOUT

Stopped

µ

FDO

PDO2

PDO1

Stopped

µ

Is pin 52 (C2F) on IC1 "L" ?

Yes

No

There are too many error flags on a damaged disc which
makes error correction impossible.

Check again using a known good disc.

1. When playing at normal speed

Check the peripheral circuit at pin 39 (DOUT) on IC1 and
the waveform (Figure 54-2).

If OK, Check the unit.

When a disc is loaded, start play operation.

The HF waveform is normal, but the TOC data cannot be
read.

Check the PDO waveform. (Figure 54-1)

Check around pins 73~78 on IC1.

– 55 –

1

SLCO

Output

—

Control output.

2

SLCIST

Input

—

Resistor connection terminal for SLCO output current setting.

3

EFMIN

Input

—

RF signal input terminal.

4

RF

Output

—

RF signal monitor terminal.

5

RFVDD

Input

—

RF power terminal.

6

RFVSS

—

—

RF earth terminal. To be connected to 0 V.

7

FIN1

Input

—

A+C signal input terminal.

8

FIN2

Input

—

B+D signal input terminal.

9

TIN1

Input

—

E signal input terminal.

10

TIN2

Input

—

F signal input terminal.

11

VREF

Output

RFVDD/2

VREF voltage output terminal.

12

REF1

Input

—

Reference supply setting terminal.

13*

FE

Output

ZHI

FE signal monitor terminal.

14

TEC

Output

–

LPF capacitor connection terminal for TE signal.

15*

TE

Output

ZHI

TE signal monitor terminal.

16*

RFMON

Output

ZHI

RF internal signal monitor terminal.

17

JITTC

–

—

Capacitor connection terminal for jitter detection.

18

ADAVDD

Input

—

Power terminal for servo A/D, D/A.

19

ADAVSS

—

—

Earth terminal for serve A/D, D/A. To be connected to 0 V.

20

TDO

Output

ADAVDD/2

Output terminal for tracking control. D/A output.

21

FDO

Output

ADAVDD/2

Output terminal for focus control. D/A output.

22

SPDO

Output

ADAVDD/2

Output terminal for spindle control. D/A output.

23

SLDO

Output

ADAVDD/2

Output terminal for sled control. D/A output.

24*

GPDAC

Output

ADAVDD/2

Servo D/A general-purpose output terminal.

25

CONT4

Input/Output

Input Mode

General-purpose I/O terminal 4.

26

CONT5

Input/Output

Input Mode

General-purpose I/O terminal 5.

27*

SBCK/CONT6

Input/Output

Input Mode

General-purpose I/O terminal 6 or
Subcode reading clock input terminal.

28

SBCK/FG

Input

—

Subcode reading clock input terminal/FG signal input terminal/external
emphasis setting terminal. Terminal functions are set by commands. When
not used, connect to 0 V.

29*

DEFECT

Output

L

Defect terminal.

30*

V/*P

Output

H

Auto switching monitor output terminal for rough servo phase control. “H”:
rough servo, “L”: phase servo.

31*

FSEQ

Output

L

Sync signal detection output terminal.
The status changes to “H” when the sync signal detected in EFM and the
sync signal of internal generation are identified.

32*

MONI1

Output

L

Internal signal monitor terminal 1.

33*

MONI2

Output

L

Internal signal monitor terminal 2.

34*

MONI3

Output

L

Internal signal monitor terminal 3.

35*

MONI4

Output

L

Internal signal monitor terminal 4.

36*

MONI5

Output

L

Internal signal monitor terminal 5.

37

VSS

—

—

Digital system earth terminal. To be connected to 0 V.

38

VDD

Input

—

Digital system power terminal.

39*

DOUT

Output

L

Digital OUT output terminal. (EIAJ format)

40

TEST

Input

L

Input terminal for test. To be connected to 0 V.

41

LVDD

Input

—

Power supply for Left channel.

42

LCHO

Output

LVDD/2

Left channel output.

43

LVSS

—

—

GND for Left channel. Must be connected to 0 V.

Controlled by commands from the
microcomputer. When not used, set
them as input terminals and connect
to 0 V, or set them as output
terminals and leave open.

In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.

Left channel

D/A converter

For slice level

control.

– 56 –

44

RVSS

—

—

GND for Right channel. Must be connected to 0 V.

45

RCHO

Output

LVDD /2

Right channel output.

46

RVDD

Input

—

Power supply for Right channel.

47

XVDD

Input

—

Power supply for crystal oscillator.

48

XOUT

Output

—

Connected for the 33.8688 MHz crystal oscillator ciement.

49

XIN

Input

—

50

FSX/16MIN

Input/Output

Input

7.35 kHz Synchronization signal monitor port.
or Clock input port for Digital filter & D/A

51

XVSS

—

—

Crystal

GND for crystal oscillator. Must be connected to 0 V.

Oscillator

52*

C2F

Output

H

C2 FLAG monitor port.

53*

EFLG

Output

L

C1, C2 error corrected  monitor port.

54*

16MOUT

Output

Clock

16.9344 MHz output port.

55

ASLRCK

Input

—

Word clock input port.
(If this port does not use, must be connect to 0 V.)

56

ASDACK

Input

—

Bit clock input port.
(If this port does not use, must be connect to 0 V.)

57

ASDFIN

Input

—

Left/Right channel data input port.
(If this port does not use, must be connect to 0 V.)

58*

LRCK

Output

L

Word clock output port.

59*

BCK

Output

L

Digital data

Bit clock output port.

60*

DATA

Output

L

Left/Right channel data output port.

61

CE

Input

—

Chip enable signal input port.

62

CL

Input

—

Microcomputer

Data transfer clock input port.

63

DI

Input

—

Interface

Data input port.

64

DO

Output

(H)

Data output port. (N-ch. open drain output.)

65

*WRQ

Output

H

Interruption signal output.

66

*RES

Input

—

Chip reset signal input port.
This port must be set LOW after first applied power on.

67

DRF

Output

L

Focus detection output port.

68

VDD5

Input

—

Power supply for Microprocessor.

69

VSS

—

—

GND for digital circuit. Must be connected to 0 V.

70

CONT3

Input/Output

Input

General purpose port 1.

71

CONT2

Input/Output

Input

General purpose port 2.

72*

CONT1

Input/Output

Input

General purpose port 3.

73

PDO1

Output

—

Internal VCO control phase comparator output port 1.

74

PDO2

Output

Input

Internal VCO control phase comparator output port 2.

75

VVSS

—

—

GND for internal VCO. Must be connected to 0 V.

76

PCKIST

Input

—

PDO output current adjustment resistor connection port.

77

VVDD

Input

—

Power supply for internal VCO.

78

FR

Input

—

VCO frequency range adjustment port.

79

LDS

Input

—

LASER power detected signal input port.

80

LDD

Output

—

LASER power control signal output port.

Right channel
D/A converter

Crystal

Oscillator

Anti-shock

Controlled with serial data command from micro-
computer. When not used, General purpose input/
output terminal 7. set it as the input terminal and open
it by connecting to 0 V, or set it as the output terminal
and open it.

PLL

In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.

Be sure to supply the same potential to each power terminal. (VVDD, ADAVDD, VDD, LVDD, RVDD, XVDD)
Terminal witch is controlled by the power terminal (VDD5 V) for a microcomputer interface :
CE (61 pin), CL (62 pin), DI (63 pin), DO (64 pin), WRQ (65 pin), RES (66 pin), DRF (67 pin)