Harman Kardon HD-755 Service manual

The Harman Kardon

HD755

Model HD755 silver

COMPACT DISC PLAYER

Technical Manual

Standby

CONTENTS

1. LASER BEAM SAFETY PRECAUTIONS ............. 2

2. CONTROL AND FUNCTIONS ............................. 4

3. SPECIFICATIONS AND FEATURES ..................... 7

4. AUDIO CHARACTERISTICS TEST PROCEDURE

.............................................................................. 9

5. CIRCUIT DESCRIPTION ....................................11

6. CRITICAL I.C. SPECIFICATION ........................ 15

7. PART LIST ......................................................... 41

8. TROUBLE SHOOTING GUIDE .......................... 48

* Harman/ kardon continually strives to improve its products. The HD750 Compact Disc Player design and

specifications are subject to change and may differ from the published specifications and descriptions, but will always equal or exceed the original specifications unless otherwise stated.

9. BLOCK DIAGRAM ............................................. 54

10. SCHEMATIC DIAGRAMS .................................. 55

11. PCB LAYOUT ..................................................... 59

12. EXPLODED VIEW .............................................. 62

13. PACKING DRAWING ......................................... 63

DANGER: Invisible laser radiation when open and interlock failed or defeated.

AVOID DIRECT EXPOSURE TO BEAM.

Parts and Service Office 250 Crossways Park Dr., Woodbury, N.Y. 11797 1112-FL8350 P9603 1200 Printed in Hong Kong

LASER BEAM SAFETY PRECAUTIONS

CLASS 1 LASER PRODUCT

CAUTION Invisible laser radiation when the unit is open. Do not stare into beam.

CAUTION: USE OF ANY CONTROLS, ADJUSTMENT, OR PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

Do not look directly at the laser beam coming from the pickup or allow it to

HD755

strike against your skin.

This compact disc player uses a pickup that emits a laser beam. The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 1 foot away

from the pickup lens when the diode is turned on. Do not look directly at the laser beam.

CAUTION:

Using controls and adjustment, or doing procedures other than those specified herein, may result in hazardous radiation exposure.

SAFETY PRECAUTIONS

WARNING

To prevent fire or shock hazard, do not

HD755

This symbol is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

This symbol is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

Caution: To prevent electric shock do not use this

(polarized) plug with an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure.

Attention: Pour prevenir les chocs electriques ne pas

utiliser cetre fiche polarisee avec un prolongateur, une prise de courant ou une autre sortie de courant, sauf si les lames prevent etre inserees a fond-sans en laisser aucune partie a decouvert.

expose the unit to rain or moisture.

HANDLING LASER PICKUP

The laser diode in the optical system of this player can be damaged by electrostatic discharge from your clothes or your body. Proper electrostatic grounding for service personal is required during servicing.

BEFORE REPAIRING THE COMPACT DISC PLAYER

Preparation

Human Body Grounding: Many of the components used in this compact disc player, including the laser pickup, are sensitive to electrostatic discharge. Service personal should be grounded with an electrostatic armband (1 Mohm).

Caution: Static charge on clothing does not escape through a body grounding wrist band. Be careful not to contact the pickup or electrical components with your clothing.

Workbench and Tool Grounding: A properly-grounded electroconductive plate (1Mohm) or metal sheet should be fitted to the workbench surface. Tools and instruments (such as soldering irons and scopes) should be grounded to prevent AC

leakage.

Note: Laser diodes are so susceptible to damage from static electricity that, even if a static discharge does not ruin a diode, it can shorten its life or cause it to work improperly.

Front Panel Controls

HD755

Standby



Power Switch

Status Mode Indicator

Headphones Jack

Headphones Level Control

CD Drawer

3 4

12 11

Open/Close Button

Search Button

Skip Button

Stop Button

Play/Pause Button

Repeat Button

HDCD Indicator

Information Display

Remote Sensor Program Button

151617 9

16 17

Random Button Repeat Button



Power: Press this switch to apply power to

the HD750. Then the Status-Mode Indicator

will turn green, the Information Display

will illuminate and all trays will be checked automatically for discs. Press the switch again to turn the unit off;the Status-Mode Indicator

will turn amber,indicating that the unit is in Standby. When the HD750 is connected to a switched AC outlet,such as those found on the back of many audio products, and the AC outlet will be turned on,the unit will turn to Standby mode only.

Status-Mode Indicator: When the HD750 is in the On mode, this indicator will glow green. When the unit is off, the indicator will glow amber,indicating that the unit is still connected to AC power.

Headphones Jack: Connect a set of standard headphones to this jack for private listening.

Program Button: This button is used to

program the playback of a disc in a particular

program the playback of a disc in a particular order.

order.

Random Button: Press this button to

have all of the tracks played in a random order.

Repeat Button: Press this button once to

repeat only the tracfk currently being played. Press

it again to continually repeat all tracks on a disc.

Headphones Level Control: Turn this knob to increase or decrease the volume level for headphones connected to the HD750’s

Headphones Jack

level will not change the sound level for the unit’s main output,as that remains constant.

CD Drawer: This drawer holds the discs that will be played.Press the Open/Close button

to open the drawer so that discs may be

inserted.

Open/Close: Press this button to open or close the disc drawer. DO NOT push the drawer to close it or damage to the transport mechanism may result.

Search: Press one side of this button to search forward button to search backwards disc to locate a particular portion of the disc being played.

Skip: Press the right side of this button to move to the next track the button to move back to the previous track

‡ﬁ

on the disc being played.

Stop: Press this button to stop the disc currently being played. During programming functions, this button is also used to exit the pro-

gram mode.

.Note that changing this

—

or the other side of the

‚

ﬂ·

or the left side of

through a

Play/Pause Button:Press this button to start the playback of a CD.If the CD drawer is open,pressing this button will automatically close the drawer. When a disc is playing press this button once to momentarily stop a disc. When the button is pressed again, the disc will resume play at the point it was stopped.

Intro Button: Press this button to put the HD750 in teh Intro Scan mode. When you press the button, the unit will play the first 10 sec of each track on the disc, and then move to the next track. Press the button again to defeat the function and continue full play of the current track.

HDCD Indictaor: The LED will light automatically when a CD with HDCD encoding is playing. No further action is needed to enjoy the benefits of HDCD.

Information Display: This display provides details about the operation of the HD750.

Remote Sensor: The sensor behind this window receives commands from the remote control.Keep this area clear if you wish to use the HD750 with a remote control.

Important Note: When the unit is turned off

(to Standby), pressing any button on the front

panel will turn the unit on. When Play 5 10 on the front or on the remote is pressed, the unit will automatically turn on and start playing the disc actually loaded.

Rear Panel Connections

2 3 1 5

HD755



Digital Output



Audio Outputs



Remote Control Output



Digital Output: Connect this jack to the coaxial

digital input of an external digital-to-analog converter for direct access to the digital signals of HD750, DO NOT connect this jack to the standard audio inputs of any device.



Audiio Outputs: Connect these jacks to the CD audio inputs of your receiver, surround processor or preamplifier.



Remote Control Input



AC Power Cord



Remote Control Output: Connect this jack to the input of another compatible Harman Kardon remote controlled device to have the remote sensor on the HD750 provide signals to other products.



Remote Control Input: Connect the output of a remote infrared sensor or the remote control output of another compatible Harman Kardon product.This will enable the remote control system to operate even when the front panel Remote Sensor is blocked. It will also allow use of the HD750 with optional, external control systems.



AC Power Cord: Connect this plug to an AC outlet, if the outlet is switch controlled, make certain that the switch is in the ON position.

Remote Control Functions

HD755

16 15

11 10

9 8

7 6

Display Button

Numeric Controls

Clear Button

Search Buttons

Skip Buttons

Stop Button

Play Button

Program Button

Pause Button

Check Button

Time Button

Random Button

Repeat Button

A B Button Power On

15 16

Power Off Open/ Close Button

HD755

HD750 Preliminary Production Specification Version 0.1

GENERAL INFORMATION

1. Power Consumption Operating <18W; Standby <5W

2. Power Super 230V AC 50Hz

3. Dimensions 440 x 130 x 386mm

4. Product Outlook Refer to attached diagram

5. Remote Unit harman/kardon remote code

6. Compliance Requirement i EMC EN55013, EN61000-3-2, EN61000-3-3, EN55022 ii. CE (LVD EN60065)

iii. HDCD

7. Sound Processor HDCD

8. CD Servo System Digital Servo, Auto Alignment

AUDIO SPECIFICATION

HD755

Typical Limit

Output Level 1KHz 0dB (no HDCD) 1.0 Vrms +-1dB Output Level 1KHz 0dB (HDCD output) 2.0Vrms +- 2dB Frequency Response 20Hz~20KHz reference +0-1dB +0.5-1.5dB THD 1KHz 0dB (30KHz Filter) 0.006% 0.01% THD 1KHz 0dB (no any filter) 0.03% 0.08% THD 20Hz~20KHz 0dB (30KHz Filter) 0.04% 0.05% S/N 1KHz 0dB A-weighted (A Filter) 96dB 96dB Dynamic Range 95dB 95dB Channel Separation 1KHz 0dB(30KHz Filter) 94dB 90dB Channel Balance +-0.5dB +-1.5dB De-emphasis (5KHz,16KHz) +-0.5dB +-1.5dB

Headphone output specification under 32 ohm load

Maximum Headphone Output Level 1KHz 0dB 1.5Vp-p +-0.2V Frequency Response (20~20KHz) +-1dB +-1.5dB THD 20~20KHz 0dB (30KHz Filter) 0.1% 0.2%

Test Disc Specification

Typical Limit

Black Dot TCD 725B 1000um 600um

HD750 Preliminary Production Specification

Test Disc Specification

Typical Limit

Black Dot TCD 725B 1000um 600um Interruption MCD-131 900um 600um Finger print 75um 65um Vertical Deviation MCD-151 0.92mm 0.92mm Eccentricity TCD 712 140um 140um 8cm test disc TCD 783 Last Track Last Track Access Time 1st to last track YEDS18 4 sec 10 sec

HD755

Audio Characteristics Test Procedure

Test Equipment

1. 3346 CD Player Evaluating Filter x 2 (NF Electronic Instrument)

2. VP7722 Panasonic Audio Analyzer

3. Sony YEDS18 Test CD disc

Procedure

Equipment Setup

1. The audio output of the CD player under test is connected to the CD filter L

& R inputs.

2. The outputs from the filter are connected to the Audio Analyzer.

Check the output Voltage

1. Set the mode of the filter to ‘THRU’

HD755

2. Set the mode of Audio Analyzer to ‘LEVEL’ mode

3. Select track 2 of the test disc and play the CD disc

4. The output voltage and gain of the R & L channels are taken by pressing

the respective buttons on the control board of Audio Analyzer.

Frequency Response

1. Set the mode of the filter to reference level mode.

2. Select the track 3, 4, 5, and 6 of the test disc and run it under ‘ Play’ mode.

3. Check the output of the R & L Channels

Total Harmonic Distortion

1. Set the mode of the filter to ‘DIST/CH-SP’ mode

2. Set the audio analyzer to ‘DIST’ mode.

3. Set the unit of the audio analyzer to ‘ %’ mode

4. Select the track 2, 4, and 5 on the test disc and run them under ‘ PLAY ’

mode

5. Check the % of each R & L channels

Signal to Noise Ratio

1. Set the mode of the filter to ‘ S/N’ mode

2. Play track 2 of the test disc

3. The unit of the audio analyzer is set to dB mode

4. Press the S/N key on the control panel of the audio analyzer

5. Play track 7

6. Measure the data of S/N ratio

Dynamic Range

1. Set the mode of the filter to ‘D-Range’ mode

2. Set the audio analyzer to ‘DIST’ Mode

3. Set the unit of the audio analyzer to ‘dB’ mode

4. Play track 17of the test disc

5. The dynamic range should be |A| + 60dB

HD755

Channel Separation

1. Set the mode of the filter to ‘DIST/CH-SP’ mode

2. Set the audio analyzer to ‘LEVEL’ mode

3. Play the tracks 8, 9, 10 & 11

4. The measured results is the difference between L & R channel

De-emphasis

1. Press the ‘THRU’ button of the CD filter

2. Play the track 2 of the test disc

3. Press the ‘Relative Level’ and make it ‘ ON’

4. Select the track 12 and 13 and measure the L & R channels value

FUNCTION DESCRIPTION

32312821302325

GCTRL

To Focus System

TBAL

Subtraction

R10

TENC8TEOUT

GCTRL

C15C5R5

REF1VREF2

R15

R14

TBAL

Tracking System

A B C D

HD755

PDIC

The tracking error output of E and F is given to Pin 25 (TEOUT). C8 is required for oscillation-proof. R10 is chosen such that TEOUT of Pin 25 become 1.4Vp-p.

During alignment procedure, the DSP IC (MN662790) will adjust the tracking balance voltage V

from Pin 31. V

TBAL

varies with reference to the center voltage V

TBAL

(=1.65 V)

REF2

within ±0.5 V.

The tracking gain will change according to the type of disc. For normal disc or CDR disc, V

is set to V

GCTRL

; for CDRW disc V

REF2

focus gain is changed too.

is set to V

GCTRL

- 0.75 V. At the same time, the

REF2

Focus System

3634282927

GCTRL

FBAL

Subtraction

FENC4FEOUT

GCTRL

C2C3R6

FBAL

35333

C35

C47

R27

R21

R20

A B C D

HD755

PDIC

The focus error output of A, B, C and D are given to Pin 27. C4 is required for oscillationproof. R7 is set such that FEOUT of Pin 27 becomes 1.46 Vp-p.

During alignment procedure, the DSP IC (MN662790) will adjust the focus balance voltage V

from Pin 30. V

FBAL

varies with reference to the center voltage V

FBAL

(=1.65 V) within

REF2

±0.5 V.

The focus gain will change according to the type of disc. For normal disc or CDR disc, V

is set to V

GCTRL

; for CDRW disc V

REF2

is set to V

GCTRL

- 0.75 V. At the same time, the

REF2

tracking gain is changed too.

RF, EQ, AGC

GCTRL

35333

C35

C47

R27

R21

R206EQ

AGC

8910

ENV

CC1

ARF

CC1

NRFDET

ENV

C29

C39

C28

C38

RFOUT

HD755

DETECTION

The signals A, B, C and D input from PDIC are composed into the RF signal by the RF Addition Amp, then output from RFOUT of Pin 5. This Amp is designed so that RFOUT is about 0.5 Vp-p for normal CD disc (about 0.4 Vp-p for CDR and 0.12 Vp-p for CDRW).

RF signal from Pin 5 is then input to the AGC block through the EQ block (the EQ characteristic is fixed for single speed operation in this design). It is then gain-controlled and output to Pin 10 ARF. The AGC block maintains the output level of ARF to about

1.0Vp-p for all types of disc. C38 connected to Pin 9 is for the AGC loop filter.

The RF Detection block detects the amplitude of the RF signal inputted from the EQ block. Inputted RF signal is detected after passing through a high-pass filter. Detection level is changed in accrodance with the voltage of GCTRL Pin 28.

The ENV detection block detects the fluctuation of the 3T-composition in the RF signal which is needed for focus balance adjustment. C39 connected to Pin 11 forms a filter for detecting the signal fluctuation. The ENV output signal from Pin 12 is filtered by C29.

19LD2

CC1

170mV

LASER UNIT

C33

R18Q1LDON

CC1

R/2

REF1

CC2

R/2

REF2

HD755

APC

The laser diode has large negative temperature characteristic in its optical output when driven with a constant current on laser diode. Therefore, the output on processing monitor photo diode, must be a controlled current for getting regular output power, thus the APC (Auto Power Control) circuit is composed.

Reference Power Supply

A reference power supply for servo is built-in. The current capacity of the reference supply is about 3 mA.

REF1

= 1/2 V

= 2.5 V

CC1

= 1/2 V

REF2

where V

= 1.65 V

CC2

= 5 V and V

CC1

= 3.3 V

CC2

MN662790RSA1

Signal Processing LSI for CD Players

Overview

The MN662790RSA is a CD signal processing LSI that, on a single chip, combines optics servos for the CD player (focus, tracking, and traverse servos), digital signal processing (EFM demodulation and error correction), digital servo processing for the spindle motor, digital filter, and D/A converter, so thus covers all signal processing functions from the head's RF amplifier onward.

Features

(Optics servo)

Focus, tracking, and traverse servos Automatic adjustment functions for FO/TR gain, FO/TR offset, and FO/TR balance Built-in D/A converter for drive voltage output Built-in dropout countermeasures Anti-shock functions Built-in track cross counter Digital input pins Traverse speed detection function

(Digital Signal Processing)

Built-in DSL and PLL Frame synchronization detection, holding, and insertion Subcode data processing

Subcode Q data CRC check Built-in subcode Q data register

CIRC error detection and correction

C1 decoder: duplex error correction C2 decoder: triplex error correction Built-in 16-K bits of RAM for use in de-

interleaving

Audio data interpolation

Averaging or retention of previous values

Digital attenuation (–12 dB) Audio data peak level detection function Digital audio interface (EIAJ format) Audio data serial interface for input and output

(Audio circuits)

Digital filter using 8-fold oversampling Built-in D/A converter (1-bit D/A converter) Built-in differential operational amplifier (secondary low pass filter)

(Other)

Built-in playback pitch control function (normal speed only) (±13%) Support for quadruple-speed playback (digital servo and signal processing block only) Built-in support for jitter-free disc rotation synchronization playback Oscillator shutdown mode Power management mode Operating voltage 3.3 V for internal circuit; 5 V for

Applications

CD players

HD755

(Spindle Motor Servo)

CLV digital servo Switchable servo gain

MN662790RAS1

Pin Assignment

HD755

BYTCK/TVSTOP

CLDCK

FCLK

IPFLAG

FLAG CLVS

CRC

DEMPH

FLAG6/RESY

IOSEL

TEST

DD1

OUTL AV

SS1

OUTR

RSEL CSEL

PSEL

MSEL

SSEL

SS2AVDD2

VDDX2X1VSSSBCK

60595857565554535251504948474645444342

61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

12345678910111213141516171819

BCLK

LRCK

SS1

DD1

SRDATA

SUBC

VCOF2

MCLK

PCK

EFM

MLD

SENSE

MDATA

VCOF

PLLF

FLOCK

TLOCK

BLKCK

DSLF

SQCK

REF

DRF

SUBQ

DMUTE

ARF

WVEL

RST

STAT

PLAY

PLLF2

SMCK

PMCK

LDON

BDO

RFDET

TRCRS

OFT

VDET

RFENV

TBAL

FBAL

V 28 27 26 25 24 23 22 21

REF

FOD

TRD

KICK

ECS

ECM

TVD

TRV

(TOP VIEW)

QFS080-P-1414

MN662790RAS1

Block Diagram

SS2

DD2

LRCKIN/MSEL

BCLKIN/SSEL

SRDATEIN/PSEL

IOSEL

CLVS

CRC

SBCK SUBC

SSEL SQCK SUBQ

PCK

EFM

PLLF

PLLF2

DSLF

REF

DRF ARF

RSEL

PSEL

MLD

MCLK

VCOF

SMCK

FCLK

PMCK

CSEL

MSEL

X2 X1

STAT

13 62 56 55 68 69

80 14 15

53 52 48 41 47 45 46 44 76 78

9 7 8

54 49

19 63 20 77 79 59 58

BLKCK CLDCK

DEMPH

FLAG6/RESY

MDATA

CK384/EFM

VCOF2

DIGITAL

DEEMPHASIS

BUFFER

SUBCODE

DSL•PLL VCO

EFM DEMODULATION

SYNC INTERPOLATION

8 TIMES

OVER SAMPLING

DIGITAL FILTER

SUBCODE DEMODULATION

LOGICS

1 BIT DAC

16K

SRAM

CIRC ERROR CORRECTION

DEINTERLEAVE

VCO

INTERFACE

MICROCOMPUTER

TIMING

GENERATOR

PITCH CONTROL

A/D CONVERTER INPUT PORT

)

(

PWM

)

(

PWM

DIGITAL

AUDIO

CLV

INTERPOLATION

SOFT MUTING

DIGITAL

SERVO CPU

SERVO TIMING GENERATOR

–

INTERFACE

SERVO

ATTENUATION

PEAK DETECT

AUTO CUE

D/A

OUTPUT

74 72

65 64

24 23

2 3 1

21 26 29 61 25 22 27 28 31

CONVERTER

30 12 11 42 40

PORT

43 10

OUTR

OUTL

SS1

DD1

FLAG IPFLAG

ECM PC

LRCK SRDATA BCLK DMUTE

TRV KICK V

REF

BYTCK/TRVSTOP ECS TVD TRD FOD TBAL FBAL TLOCK FLOCK PLAY LDON

WVEL SENSE

HD755

605745187132

SS1

DD1

RST

TEST

33TE34

RFENV

TRCRS

VDET

BDO

RFDET

OFT

MN662790RAS1

Pin Descriptions

Pin No. Symbol I/O Function Description

1 BCLK O SRDATA bit clock output. 2 LRCK O Left/right channel discrimination signal output. 3 SRDATA O Serial data output. 4DV 5DV 6 TX O Digital audio interface output signal. 7 MCLK I Microcomputer command clock input. (Data is latched at rising edge.) 8 MDATA I Microcomputer command data input.

9 MLD I Microcomputer command load signal input. "L" level: load. 10 SENSE O Sense signal output. (OFT, FESL, NACEND, NAJEND, SFG, and NWTEND) 11 FLOCK O During default operation, focus servo convergence signal.

12 TLOCK O During default operation, tracking servo convergence signal. "L" level:

13 BLKCK O Subcode block clock signal (f 14 SQCK I External clock input for subcode Q register 15 SUBQ O Subcode Q data output 16 DMUTE I Muting input. (Effective only for an output bit rate of 64 fs) "H" level: muting. 17 STAT O Status signal.

18 RST I Reset input. "L" level: reset. 19 SMCK O If MSEL is "H" level, 8.4672 MHz clock signal output.

20 CSEL O Oscillation frequency selection: "H" is 33.8688MHz; "L" is 16.9344MHz. 21 TRV O Traverse forced feed output. (tristate) 22 TVD O Traverse drive output. 23 PC O Spindle motor ON signal. "L" level: ON (default). 24 ECM O Spindle motor drive signal (forced mode output). (tristate) 25 ECS O Spindle motor drive signal (servo error signal output). (tristate) 26 KICK O Kick pulse output. (tristate) 27 TRD O Tracking drive output. 28 FOD O Focus drive output. 29 V

30 FBAL O Focus balance adjustment output. 31 TBAL O Tracking balance adjustment output. 32 FE I Focus error signal input. (analog input)

DD1

SS1

"L" level: convergence.

convergence.

REF

I Power supply for digital circuits. I Ground for digital circuits.

During command execution, direction detection output for external track counter.

During command execution, traverse speed control output.

=75 Hz)

BLKCK

(CRC, CLVS, TTSTOP, JCLVS, SQOK, FLAG6, SENSE, FLOCK, TLOCK, rpm data, and FCLV)

If MSEL is "L" level, 4.2336 MHz clock signal output

I Reference voltage for DA output (TVD, ECS, TRD, FOD, FBAL, and

TBAL).

HD755

MN662790RAS1

Pin Descriptions (continued)

Pin No. Symbol I/O Function Description

33 TE I Tracking error signal input. (analog input) 34 RFENV I RF envelope signal input. (analog input) 35 VDET I Vibration detection signal input. "H" level: vibration detected. 36 OFT I Offtrack signal input. "H" level: offtrack. 37 TRCRS I Track cross signal input. (analog input) 38 RFDET I RF detection signal input. "L" level: detected. 39 BDO I Dropout signal input. "H" level: dropout. 40 LDON O Laser ON signal output. "H" level: ON.

41 PLLF2 I/O PLL loop filter characteristic selection pin. 42 TOFS O Tracking offset adjustment or DSL balance output(D/A output). 43 WVEL O Double-speed status signal output. "H" level: double-speed. 44 ARF I RF signal input. 45 I

REF

46 DRF I DSL bias pin. 47 DSLF I/O DSL loop filter pin. 48 PLLF I/O PLL loop filter pin. 49 VCOF I/O VCO loop filter pin. 50 AV

51 AV

DD2

SS2

52 EFM O EFM signal output. EFM output when IOSEL is "H" level.

or CK384 •Crystal oscillator 16.9344-MHz clock output when I

53 PCK O PLL derived clock or DSL balance output. f

54 VCOF2 I/O VCO loop filter pin. 55 SUBC O Subcode serial output. 56 SBCK I Serial clock input for subcode serial output. 57 V

58 X1 I Crystal oscillator circuit input/output pins. f=16.9344 MHz, 33.8688 MHz. 59 X2 O Crystal oscillator circuit output/output pins. f=16.9344 MHz, 33.8688 MHz. 60 V

BYTCK or

TRVSTOP When IOSEL is "L" level, traverse stop signal output. "H" level: stop mode. 62 CLDCK O Subcode frame clock signal output pin. (f 63 FCLK O Crystal frame clock signal output. (f 64 IPFLAG O Interpolation flag signal output. "H" level: interpolation. 65 FLAG O Flag signal output.

I Reference current input pin.

I Power supply for analog circuits (DSL, PLL, D/A converter output, and A/D

converter).

I Ground for analog circuits (DSL, PLL, D/A converter output, and A/D

converter).

•OSEL is "L" level.

output from signal processing block. (During

•384 f

variable-pitch operation, this is the VCO clock.)

Commands permit switching among the above three outputs.

=4.3218 MHz.

PCK

or DSLB

I Ground for oscillator circuit.

I Oscillator circuit power supply.

When IOSEL is "H" level, byte clock signal output.

=7.35 kHz)

CLDCK

=7.35 kHz)

FCLK

HD755

MN662790RAS1

Pin Descriptions (continued)

Pin No. Symbol I/O Function Description

66 CLVS O Spindle servo phase synchronization signal output. "H" level: CLV. "L"

level: rough servo.

67 CRC O During default operation, subcode CRC check result output. "H" level: OK.

"L" level: no good.

During command execution, pulse output for external track counter. 68 DEMPH O De-emphasis detection signal output. "H" level: ON. 69 FLAG6 or O When IOSEL is "L" level, FLAG6 output, signal for resetting address of

RESY RAM for error correction de-interleave. "L" level: address reset.

When IOSEL is "H" level, RESY output, frame resynchronization signal.

"H" level: synchronized. "L" level: out of sync. 70 IOSEL I Mode selection pin 71 TEST I Test pin. Keep this at "H" level. 72 AV

73 OUTL O Left channel audio output. 74 AV

75 OUTR O Right channel audio output. 76 RSEL I RF signal polarity selection pin. "H" level: bright level is "H."

77 V

78 PSEL I When IOSEL is "H" level, test pin. Keep this at "L" level.

79 MSEL I When IOSEL is "H" level, frequency selection pin for SMCK pin output.

80 SSEL I When IOSEL is "H" level, SUBQ pin output mode selection pin.

DD1

SS1

CC5V

I Power supply for analog circuits. (common use for left and right channel

audio outputs.)

I Ground for analog circuits. (common use for left and right channel audio

outputs.)

"L" level: bright level is "L."

I 5-V power supply applied to pins for 5-V input.

When IOSEL is "L" level, SRDATA input.

"H" level: SMCK=8.4672 MHz

When IOSEL is "L" level, LRCK input.

"H" level: left channel data. "L" level: right channel data. SMCK output fixed at 4.2336 MHz.

"H" level: buffered subcode Q mode. "L" level: CLDCK synchronization mode.

When IOSEL is "L" level, BCKL input.

Buffered subcode Q mode.

HD755

+ 45 hidden pages