Harman Kardon HD750 User manual

Technical Manual
The Harman Kardon
Model HD750
COMPACT DISC PLAYER
DANGER: Invisible laser radiation when open and interlock failed or defeated.
AVOID DIRECT EXPOSURE TO BEAM.
CONTENTS
Parts and Service Office
250 Crossways Park Dr., Woodbury, N.Y. 11797
1112-FL8350 P9603 1200 Printed in Hong Kong
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
9. BLOCK DIAGRAM ............................................. 54
10. SCHEMATIC DIAGRAMS .................................. 55
11. PCB LAYOUT ..................................................... 59
12. EXPLODED VIEW .............................................. 62
13. PACKING DRAWING ......................................... 63
* 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.
8. TROUBLE SHOOTING GUIDE .......................... 48
Standby

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
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.
2
HD750

SAFETY PRECAUTIONS
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 consti-
tute 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, recep-
tacle 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 au-
tre sortie de courant, sauf si les lames prevent
etre inserees a fond-sans en laisser aucune
partie a decouvert.
HANDLING LASER PICKUP
The laser diode in the optical system of this player can be damaged by electrostatic discharge from
yourclothesoryourbody. Properelectrostaticgroundingforservicepersonalisrequiredduringservicing.
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.
WARNING
To prevent fire or shock hazard, do not
expose the unit to rain or moisture.
3
HD750

HD750
 Power:Press this switch to apply power to
the HD750.Then the Status-Mode Indicator
1 will turn green, the Information Display
C will illuminate and all trays will be checked
automatically for discs.Press the switch again to
turn the unit off;the Status-Mode Indicator
1 will turn amber,indicating that the unit is in
Standby.When the HD750 is connected to a
switchedAC outlet,such as those found on the
back of many audio products,and theAC outlet
will be turned on,the unit will turn to Standby
mode only.
1 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 toAC power.
2 Headphones Jack: Connect a set of stan-
dard headphones to this jack for private listening.
3 Headphones Level Control: Turn this knob
to increase or decrease the volume level for
headphones connected to the HD750’s
Headphones Jack
2 .Note that changing this
level will not change the sound level for the
unit’s main output,as that remains constant.
4 CD Drawer:This drawer holds the discs
that will be played.Press the Open/Close but-
ton
5 to open the drawer so that discs may be
inserted.
5 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 mecha-
nism may result.
6 Search: Press one side of this button to
search forward
— or the other side of the
button to search backwards
‚ through a
disc to locate a particular portion of the disc
being played.
7 Skip: Press the right side of this button to
move to the next track
fl· or the left side of
the button to move back to the previous track
‡fi on the disc being played.
8 Stop: Press this button to stop the disc cur-
rently being played. During programming
functions, this button is also used to exit the pro-
9 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.
A 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.
B 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.
C Information Display:This display
provides details about the operation of the
HD750.
D 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.
Front Panel Controls

1
2
3
4
5
6
7
8
9
A
B
C
D
Power Switch
Status Mode Indicator
Headphones Jack
Headphones Level Control
CD Drawer
Open/Close Button
Search Button
Skip Button
Stop Button
Play/Pause Button
Repeat Button
HDCD Indicator
Information Display
Remote Sensor
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.
gram mode.
Program Button:This button is used to
program the playback of a disc in a particular
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.
Random Button:Press this button to
have all of the tracks played in a random order.
Program Button:This button is used to
program the playback of a disc in a particular
order.
4
Standby
126
3 4 87
151617 9
10
13
14
12 11
5
15
16
17
15
16
17
Program Button
Random Button
Repeat Button

HD750
Rear Panel Connections





Digital Output
Audio Outputs
Remote Control Output
Remote Control Input
ACPowerCord
2315
4
 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.
 Audiio Outputs:Connectthese jacks to the CD
audio inputs of your receiver, surround processor or
preamplifier.
Digital Output: Connectthis 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.

 Remote Control Input: Connect the out-
put of a remote infrared sensor or the remote
control output of another compatible Harman
Kardon product.This will enable the remote con-
trol 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.
 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.
5

HD750
Remote Control Functions
1
3
4
5
2
6
7
8
9
11
10
12
13
14
15
16
17
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
Power Off
Open/ Close Button
1
3
4
5
2
6
7
8
9
11
10
12
13
14
15
16
17
6

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 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
7

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
HD750
8

HD750
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’
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
9

HD750
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
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
10

FUNCTION DESCRIPTION
Tracking System
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 VTBAL from Pin 31. VTBAL varies with reference to the center voltage VREF2 (=1.65 V)
within ±0.5 V.
The tracking gain will change according to the type of disc. For normal disc or CDR disc,
VGCTRL is set to VREF2; for CDRW disc VGCTRL is set to VREF2 - 0.75 V. At the same time, the
focus gain is changed too.
A B
C D
F
PDIC
E
32
31
28
21
30
23
25
24
GCTRL
To Focus System
TBAL
Subtraction
R10
TEN
C8
TEOUT
VGCTRL
C2
C15
C5
R5
VREF1
VREF2
R15
R14
VTBAL
11
HD750

Focus System
The focus error output of A, B, C and D are given to Pin 27. C4 is required for oscillation-
proof. 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
VFBAL from Pin 30. VFBAL varies with reference to the center voltage VREF2 (=1.65 V) within
±0.5 V.
The focus gain will change according to the type of disc. For normal disc or CDR disc,
VGCTRL is set to VREF2; for CDRW disc VGCTRL is set to VREF2 - 0.75 V. At the same time, the
tracking gain is changed too.
A B
C D
F
PDIC
E
36
34
28
29
27
26
GCTRL
FBAL
Subtraction
R7
FEN
C4
FEOUT
VGCTRL
C2
C3
R6
VFBAL
35
33
3
5
C35
C47
R27
R21
R20
12
HD750

RF, EQ, AGC
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.
36
34
GCTRL
VGCTRL
C2
35
33
3
5
C35
C47
R27
R21
R20
6
EQ
AGC
8
9
10
17
RF
DETECTION
ENV
DETECTION
11
12
VCC1
ARF
VCC1
NRFDET
ENV
28
C29
C39
C28
C38
RFOUT
13
HD750

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.
VREF1 = 1/2 VCC1 = 2.5 V
VREF2= 1/2 VCC2=1.65 V
where VCC1 = 5 V and VCC2 = 3.3 V
19
LD
2
1
VCC1
PD
170mV
LASER UNIT
C33
R18
Q1
LDON
20
R
VCC1
R
R/2
VREF1
22
R
VCC2
R
R/2
VREF2
14
HD750

HD750
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
(Spindle Motor Servo)
CLV digital servo
Switchable servo gain
MN662790RSA1
Signal Processing LSI for CD Players
(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 synchro-
nization playback
Oscillator shutdown mode
Power management mode
Operating voltage 3.3Vfor internal circuit; 5 V for
Applications
CD players
15

MN662790RAS1
Pin Assignment
QFS080-P-1414
(TOP VIEW)
BYTCK/TVSTOP
CLDCK
FCLK
IPFLAG
FLAG
CLVS
CRC
DEMPH
FLAG6/RESY
IOSEL
TEST
AVDD1
OUTL
AVSS1
OUTR
RSEL
CSEL
PSEL
MSEL
SSEL
VDD X2 X1 VSS SBCK SUBC VCOF2 PCK EFM AVSS2 AVDD2 VCOF PLLF DSLF DRF IREF ARF WVEL PLAY PLLF2
BCLK LRCK
SRDATA
DVDD1
DVSS1
TX
MCLK
MDATA
MLD
SENSE
FLOCK
TLOCK
BLKCK
SQCK SUBQ
DMUTE
STAT
RST
SMCK PMCK
LDON
BDO
RFDET
TRCRS
OFT
VDET
RFENV
TE
FE
TBAL
FBAL
VREF
FOD
TRD
KICK
ECS
ECM
PC
TVD
TRV
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
HD750
16

MN662790RAS1
Block Diagram
SERVO CPU
OUTPUT PORT
MICROCOMPUTER
INTERFACE
DSL•PLL VCO
60 57 4 5 18 71 32
RST
TEST
FE 33
TE 34
RFENV
37
TRCRS 35
VDET 39
BDO
38
RFDET
36
OFT
DIGITAL DEEMPHASIS
1 BIT DAC
LOGICS
8 TIMES OVER SAMPLING DIGITAL FILTER
EFM DEMODULATION SYNC INTERPOLATION SUBCODE DEMODULATION
CLV
SERVO
INTERPOLATION SOFT MUTING DIGITAL ATTENUATION PEAK DETECT AUTO CUE
DIGITAL AUDIO INTERFACE
CIRC ERROR CORRECTION DEINTERLEAVE 16K
SRAM
D/A CONVERTER
29 VREF
25
61
ECS
BYTCK/TRVSTOP
LDON
PLAY
FLOCK
TLOCK
40
42
11
12
26 KICK
21 TRV
16 DMUTE
1BCLK
3SRDATA
2LRCK
23 PC
24 ECM
6TX
64 IPFLAG
65 FLAG
22 TVD
27 TRD
28 FOD
31 TBAL
30 FBAL
43 WVEL
10 SENSE
STAT
X1
X2
MSEL
CSEL
PMCK
FCLK
SMCK
VCOF2
58
79
77
59
20
63
19
CK384/EFM 54
VCOF 49
MDATA 8
MCLK 7
MLD 9
17
44
46
45
47
41
52
76
78
RSEL
ARF
PSEL
DSLF
PLLF2
48
PLLF
62
13
67
66
55
56
68
15
14
80
CLDCK
BLKCK
SUBC
SBCK
FLAG6/RESY 69
DEMPH
CRC
CLVS
70
IOSEL
SRDATEIN/PSEL
BCLKIN/SSEL
LRCKIN/MSEL
EFM
53
PCK
SUBQ
SQCK
SSEL
IREF
DRF
75
73
PWM
(L)PWM
(R)
+
–
+
–
SUBCODE
BUFFER
51
50
AVDD2
AVSS2 OUTR
OUTL
74
72
A/D CONVERTER INPUT PORT SERVO
TIMING GENERATOR
TIMING GENERATOR PITCH CONTROL VCO
VDD
VSS
DVDD1
DVSS1
AVDD1
AVSS1
HD750
17

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
DD1 I Power supply for digital circuits.
5DV
SS1 I Ground for digital circuits.
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.
"L" level: convergence.
During command execution, direction detection output for external track
counter.
12 TLOCK O During default operation, tracking servo convergence signal. "L" level:
convergence.
During command execution, traverse speed control output.
13 BLKCK O Subcode block clock signal (fBLKCK=75 Hz)
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.
(CRC, CLVS, TTSTOP, JCLVS, SQOK, FLAG6, SENSE, FLOCK,
TLOCK, rpm data, and FCLV)
18 RST I Reset input. "L" level: reset.
19 SMCK O If MSEL is "H" level, 8.4672 MHz clock signal output.
If MSEL is "L" level, 4.2336 MHz clock signal output
20 CSEL OOscillation 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 VREF I Reference voltage for DA output (TVD, ECS, TRD, FOD, FBAL, and
TBAL).
30 FBAL O Focus balance adjustment output.
31 TBAL O Tracking balance adjustment output.
32 FE I Focus error signal input. (analog input)
HD750
18

MN662790RAS1
Pin Descriptions (continued)
Pin No. Symbol I/O Function Description
41 PLLF2 I/O PLL loop filter characteristic selection pin.
42 TOFS OTracking 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 IREF I Reference current input pin.
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 AVDD2 I Power supply for analog circuits (DSL, PLL, D/A converter output, and A/D
converter).
51 AVSS2 I Ground for analog circuits (DSL, PLL, D/A converter output, and A/D
converter).
52 EFM O EFM signal output. EFM output when IOSEL is "H" level.
or CK384 •Crystal oscillator 16.9344-MHz clock output when I
•OSEL is "L" level.
•384 fsoutput from signal processing block. (During
variable-pitch operation, this is the VCO clock.)
Commands permit switching among the above three outputs.
53 PCK O PLL derived clock or DSL balance output. fPCK =4.3218 MHz.
or DSLB
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 VSS I Ground for oscillator circuit.
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 VDD I Oscillator circuit power supply.
61 BYTCK or OWhen IOSEL is "H" level, byte clock signal output.
TRVSTOP When IOSEL is "L" level, traverse stop signal output. "H" level: stop mode.
62 CLDCK O Subcode frame clock signal output pin. (fCLDCK=7.35 kHz)
63 FCLK O Crystal frame clock signal output. (fFCLK=7.35 kHz)
64 IPFLAG O Interpolation flag signal output. "H" level: interpolation.
65 FLAG O Flag signal output.
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.
HD750
19

MN662790RAS1
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 AVDD1 I Power supply for analog circuits. (common use for left and right channel
audio outputs.)
73 OUTL O Left channel audio output.
74 AVSS1
IGround for analog circuits. (common use for left and right channel audio
outputs.)
75 OUTR O Right channel audio output.
76 RSEL I RF signal polarity selection pin. "H" level: bright level is "H."
"L" level: bright level is "L."
77 VCC5V I5-V power supply applied to pins for 5-V input.
78 PSEL I When IOSEL is "H" level, test pin. Keep this at "L" level.
When IOSEL is "L" level, SRDATA input.
79 MSEL I When IOSEL is "H" level, frequency selection pin for SMCK pin output.
"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.
80 SSEL I When IOSEL is "H" level, SUBQ pin output mode selection pin.
"H" level: buffered subcode Q mode.
"L" level: CLDCK synchronization mode.
When IOSEL is "L" level, BCKL input.
Buffered subcode Q mode.
Pin Descriptions (continued)
Pin No. Symbol I/O Function Description
HD750
20