Sony CDP-X5000 User manual

— 1 —
Model Name Using Similar Mechanism NEW
Base Unit Type BU-12A
Optical Pick-up Type KSS-274A/J-N
SPECIFICATIONS
MICROFILM
COMPACT DISC PLAYER
CDP-X5000
AEP Model
UK Model
E Model
Chinese Model
SERVICE MANUAL
General

— 2 —
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK !OR
DOTTED LINE WITH MARK ! ON THE SCHEMATIC
DIAGRAMS AND INTHE PARTS LIST ARE CRITICAL
TO SAFE OPERATION. REPLACE THESE COMPO-
NENTS WITH SONY PARTS WHOSE PART NUM-
BERS APPEAR AS SHOWN INTHIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
This caution
label is located
inside the unit.
TABLE OF CONTENTS
1. SERVICING NOTE ........................................................... 3
2. GENERAL ........................................................................... 4
3. DISASSEMBLY
3-1. Top Plate Assembly ............................................................. 8
3-2. Front Panel Assembly.......................................................... 8
3-3. Base Unit ............................................................................. 9
3-4. Back Panel ........................................................................... 9
4. ELECTRICAL BLOCK ADJUSTMENTS ............... 10
5. DIAGRAMS
5-1. Circuit Boards Location .................................................... 12
5-2. IC Pin Function
• IC101 Focus/Tracking/Sled/EFM Comparator
(CXD2515AQ )............................................................... 13
• IC201 System Control (CXP84124-043Q) ..................... 16
5-3. Printed Wiring Board — Servo, Panel Section —............. 20
5-4. Schematic Diagram — Servo, Panel Section — ............... 23
5-5. Schematic Diagram — Audio, Power Section — ............. 28
5-6. Printed Wiring Board — Audio, Power Section —........... 31
6. EXPLODED VIEWS
6-1. Top PlateAssembly Seciton .............................................. 37
6-2. Front Panel Section ........................................................... 38
6-3. Back Panel Section ............................................................ 39
6-4. Base Unit Section (BU-12A)............................................. 40
7. ELECTRICAL PARTS LIST ..................................... 41
The laser component in this product
is capable of emitting radiation
exceeding the limit for Class 1.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
ADVARSEL :USYNLIG LASERSTRÅLING VED ÅBNING NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE
FOR STRÅLING.
CAUTION :INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
VARO! :AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT-
TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
VARNING :OSYNLIG LASERSTRÅLING NÄR DENNA DEL ÄR ÖPP-
NAD OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.
VORSICHT : UNSICHTBARE LASERSTRAHLUNG, WENN
ABDECKUNG GE
Ö FFNET UND SICHEREITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
ADVARSEL :USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG
SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.

— 3 —
SECTION 1
SERVICING NOTE
NOTES ON HANDLINGTHE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-up
block. Therefore, when checking the laser diode emission, observe
from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION CHECK
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output three times.
WRITING OF FOCUS/TRACKING AUTO GAIN DATA
General CD palyers using digital servo ICs automatically adjust the
focus/tracking gain each time the disc is changed.
In this unit, the gain of the standard disc (YEDS-18) is written in the
non-volatile memory (IC203:X24C01S) of the servo board so that
the gain need not be re-adjusted when changing discs.
Therefore, if the servo board, IC203 of the servo board, or optical
pick-up has been replaced, be sure to write the auto gain data.
1. Connect TP (ADJ: Pin 3of CN515) to GND (Ground), and turn
ON the POWER switch.
2. Insert the test disc (YEDS-18). (The TOC data of the disc will be
read.)
This memorizes the auto gain data of the test disc.
Note:
• If the disc is replaced without turning OFF the power, the auto gain
data of the last disc inserted will be memorized.
• If the POWER switch is turned ON without connecting TP (ADJ)
to GND, the auto gain data will not be memorized when the disc is
inserted, and the data memorized the last time will be taken as the
focus/tracking data.
FLUORESCENT INDICATORTUBE FULL LIGHTING MODE
1. Connect TP (AFJ:Pin 2of CN515) to GND (Ground), and turn
ON the POWER switch.
2. The bridge check (check for short-circut between pins of the S
RAM (IC202 of the servo board)) is performed, and all the FL
tubes light up if there is no bridge.
3. When a key other than the p(stop) key is pressed, the correspond-
ing FL tubes lights up.
Each time the p(stop) key is pressed, all the FL tubes light up.
[SERVO BOARD] — Conductor Side —
CN514 CN513 CN515
IC104 IC105 IC102
IC202
ADJ
321 AFJ

— 4 —
SECTION 2
GENERAL
LOCATION OF PARTS AND CONTROLS
UNIT OPERATION BLOCK
456
78
1
2
3
REMOTE COMMANDER (RM-DX5000)
REAR PANEL
142 35
6
87
1LINE OUT
2DIGITAL OUT OPTICAL switch
3DIGITAL OUT COAXIAL switch
4DIGITAL OUT BALANCED switch
5AC IN (230V)
6DIGITAL OUT BALANCED
7DIGITAL OUT COAXIAL
8DIGITAL OUT OPTICAL
6
5
4
3
1
2
7
8
!º
!¡
9
!™
!£
!¢
!∞
!§
!¶
!•
!ª
@º
@¡
@™
1DISPLAY MODE button
2PLAY MODE buttons
CONTINUE button
SHUFFLE button
PROGRAM button
C.INDEX button
3Number buttons (1-20)
4CLEAR button
5>20 button
6CHECK button
7REPEAT button
8A˜B button
9·(play) button
!º =/+ (*AMS) buttons
!¡ C/c(index search) buttons
!™ TIME button
!£ MUSIC SCAN button
!¢ SPACE button
!∞ FADER button
!§ PEAK SEARCH button
!¶ ERASE button
!• FILE button
!ª p(stop) button
@º P(pause) button
@¡ 0/) (fast forward/
fast rewind) buttons
@™ 0/) SLOW buttons
1POWER switch
2Disc lid
30/) (fast forward/
fast rewind) buttons
4=/+ buttons (*AMS)
This section is extracted from
instruction manual.
5·(play) button/lamp
6P(pause)button/lamp
7p(stop)button
8Display window
*AMS is the abbreviation of Automatic Music Sensor.

— 5 —

— 6 —

— 7 —

— 8 —
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1.TOP PLATE ASSEMBLY
1 Connectors (CN207, CN208: SERVO board)
2 Two bolts (M3)
3 Two bolts (M3)
4 Front panel assembly
1 Four ornamental screws
2 Top plate assembly
3 Connector
(CN805: Display board)
3-2. FRONT PANEL ASSEMBLY

— 9 —
3-3. BASE UNIT
1 Connectors
(CN201, CN210: SERVO board)
2 Screw (B 3X8)
3 Ground wire
4 Four screws (B 2.6X6)
5 Boss (M) (Four pieces)
6 Base unit
Spring
3-4. BACK PANEL
1 Connectors
(CN305: A OUT board)
(CN502: CN508, CN509, CN512: AUDIO board)
2 Screw (B 3X8)
3 Ground wire
4 Two screws (B 3X6)
6 Back panel assembly
5 Three screws (BV 3X8)

— 10 —
SECTION 4
ELECTRICAL BLOCK ADJUSTMENTS
Note:
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent when
the signal level is low than specified value with the following
checks.
S Curve Check
Procedure :
1. Connect oscilloscope to test point TP (FE: CN210 !ºpin).
2. Connect between test point TP (FEI: IC101 @ªpin) and TP (VC:
CN210 !™pin) by lead wire.
3. Put disc (YEDS-18) in and turn Power switch on and actuate the
focus search.
4. Check the oscilloscope waveform (S-curve) is symmetrical be-
tweenA and B. And confirm peak to peak level within 3±1Vp-p.
S-curve waveform
5. After check, remove the lead wire connected in step 2.
Note : • Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF:CN215 1pin).
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
Note: A clear RF signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance Check
Procedure :
1. Connect test point TP (ADJ: CN515 3pin) to Ground and TP
(TEI: IC101 @¶pin) to TP (VC: CN210 !™pin) with a lead wire.
2. Connect oscillscope to test point TP (TE: CN210 !¡pin)
3. Turn Power switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
6. Remove the lead wire connected in step 1.
oscilloscope
oscilloscope
level : 1.2 Vp-p
VOLT/DIV : 200mV
TIME/DIV : 500ns
+0.25
–0.20
oscilloscope
SERVO board
symmetry
A
B
level: 3 ± 1 Vp-p
SERVO board
SERVO board
2. Turn Power switch on.
3. Put the disc (YEDS-18) in and playback.
Confirm that reading on frequency counter is 4.3218 MHz.
Setting of Focus/Tracking Auto Gain Data
Refer to “Writing of Focus/Tracking Auto gain data” on page 3.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point TP (PLK: CN513 4pin)
with lead wire.
frequency counter
TP (PLK)
TP (FE)
TP (VC)
TP (RF)
TP (VC)
TP (TE)
TP (VC)
symmetry
0Vdc
level : 2 ± 1Vp-p
SERVO board

— 11 —
Skew Adjustment
(Be sure to perform this adjustment when the optical pick-up or a
mechanical part of the optical pick-up has been replaced.)
1. Remove the top plate. (See 3. Disassembly/Top PlateAssembly)
2. Remove the eight screw (+B3X8) of the top plate and remove the
KEY board.
3. Connect the KEY board connector and the DISPLAY board con-
nector.
4. Remove the base unit. (Do not disconnect the connectors.)
(Refer to 3. Disassembly/Base Unit.)
5. Adjust with the unit placed sideways as shown in the figure.
6. Connect and oscilloscope to TP (RF: 1Pin of CN215).
7. While pressing the ±and ·buttons, press the POWER but-
ton. (The discrete open/close detection is turned OFF.)
8. Set a disk (YEDS-18) and press the ·button.
9. Rotate the adjustment screw with a Phillips screwdriver and ad-
just so that the oscilloscope waveform becomes clear.
Note: A clear RF signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform
level : 1.2 Vp-p
VOLT/DIV : 200mV
TIME/DIV : 500ns
+0.25
–0.20
Adjustment
screw
Base unit
KEY BOARD
10.After the adjustment, lock the adjustment screw.
[ SERVO BOARD ] — Conductor Side —
CN514
CN513 (ADJ)
(PLK)
CN515
IC101
CN215
CN210
6 4 1 3 1
(RF)
(FE)
(VC)
(TE)
29 (FEI)
27 (TEI)
1
12
10
2
11
1
Note: Hold the base
unit horizontally.

— 12 —
SECTION 5
DIAGRAMS
5-1. CIRCUIT BOARDS LOCATION
AC IN board
B OUT board
BSL board
AC SW board
DISPLAY board
AUDIO board
KEY board
S POWER board
OUT SW board
OPTICAL board
FLEXIBLE board
SERVO board
A OUT board
U OUT board

— 13 —
5-2. IC PIN FUNCTIONS
• IC101 FOCUS/TRACKING/SLED SERVO/EFM COMPARATOR (CXD2515AQ)
Pin Name
SRON
SRDR
SFON
TFDR
TRON
TRDR
TFON
FFDR
FRON
FRDR
FFON
VCOO
VCOI
TEST
DVss
TES2
TES3
PDO
VPCO
VCKI
AVD2
IGEN
AVS2
ADII
ADIO
RFDC
TE
SE
FE
VC
FILO
FILI
PCO
CLTV
AVS1
RFAC
BIAS
ASYI
ASYO
AVD1
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
I/O
O
O
O
O
O
O
O
O
O
O
O
O
I
I
–
I
I
O
O
I
–
I
–
I
O
I
I
I
I
I
O
I
O
I
–
I
I
I
O
–
Function
Sled drive output (Open)
Sled drive output
Sled drive output (Open)
Tracking drive output
Tracking drive output (Open)
Tracking drive output
Tracking drive output (Not used)
Focus drive output
Focus drive output (Open)
Focus drive output
Focus drive output (Open)
VCO output for analog EFM PLL (Open)
VCO output for analog EFM PLL (Connected to Ground)
TEST pin connected normally to Ground (Connected to Ground)
Digital Ground
TEST pin connected normally to Ground
TEST pin connected normally to Ground
Charge-pump output for analog EFM PLL (Open)
Charge-pump output for variable pitch PLL (Open)
Clock input from variable pitch external VCO (Connected to Ground)
Analog power supply
Power supply pin for operational amplifiers
Analog Ground
A/D converter input pin
OP amplifier output pin
RF signal input
Tracking error signal input
Sled error signal input
Focus error signal input
Center voltage input pin
Filter output for master PLL
Filter input for master PLL
Charge-pump output for master PLL
Control voltage input for masterVCO
Analog Ground
EFM signal input
Asymmetry circuit constant current input
Asymmetry comparate voltage input
EFM full swing output
Analog power supply
• Abbreviation
EFM: Eight to Fourteen Modulation
PLL: Phase Locked Loop

— 14 —
Pin Name
DVDD
ASYE
PSSL
WDCK
LRCK
DATA
BCLK
64DATA
64BCLK
64LRCK
GTOP
XUGF
XPLCK
GFS
PFCK
C2PO
XRAOF
MNT3
MNT2
MNT1
MNT0
XTAI
XTAO
XTSL
DVss
FSTI
FSTO
C4M
C16M
MD2
DOUT
EMPH
WFCK
SCOR
SBSO
EXCK
SUBQ
SQCK
MUTE
SENS
Pin No.
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
I/O
–
I
I
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
I
–
I
O
O
O
I
O
O
O
O
O
I
O
I
I
O
Function
Digital power supply
Asymmetry circuit ON/OFF (Connected to +5V)
Audio data output mode selection input (Connected to Ground)
48-bit slot D/A interface. Word clock. (Open)
48-bit slot D/A interface. LR clock.
DA 16 output when PSSL=1.48-bit slot serial data when PSSL=0
DA 15 output when PSSL=1.48-bit slot data when PSSL=0
DA 14 output when PSSL=1.64-bit slot data when PSSL=0 (Open)
DA 13 output when PSSL=1.64-bit slot data when PSSL=0 (Open)
DA 12 output when PSSL=1.64-bit slot data when PSSL=0 (Open)
DA 11 output when PSSL=1.GTOP output when PSSL=0 (Open)
DA 10 output when PSSL=1.XUGF output when PSSL=0 (Open)
DA 09 output when PSSL=1.XPLCK output when PSSL=0
DA 08 output when PSSL=1.GFS output when PSSL=0
DA 07 output when PSSL=1.RFCK output when PSSL=0
DA 06 output when PSSL=1.C2PO output when PSSL=0 (Open)
DA 05 output when PSSL=1.XRA0F output when PSSL=0 (Open)
DA 04 output when PSSL=1.MNT3 output when PSSL=0
DA 03 output when PSSL=1.MNT2 output when PSSL=0
DA 02 output when PSSL=1.MNT1 output when PSSL=0
DA 01 output when PSSL=1.MNT0 output when PSSL=0
X'tal oscillator circuit input
X'tal oscillator circuit output (Open)
X'tal selection input pin (Connected to Ground)
Digital Ground
2/3 divider output of pins 62, 63
2/3 divider output of pins 62, 63
4.2336 MHz output (Open)
16.9344 MHz output (Open)
Digital-out ON/OFF control pin
Digital-out output pin
Playback disc output in emphasis mode (Open)
WFCK output
Sub-code sync output
Sub-P through Sub-W serial output (Open)
Clock input for SBSO read-out (Ground)
Sub-Q 80-bit output
Clock input for SQSO read-out
Muting selection pin
SENS output
• Abbreviation
WFCK: Wirte Frame Clock

— 15 —
Pin Name
XRST
DIRC
SCLK
DFSW
ATSK
DATA
XLAT
CLOK
COUT
DVDD
MIRR
DFCT
FOK
FSW
MON
MDP
MDS
LOCK
SSTP
SFDR
Pin No.
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
I/O
I
I
I
I
I
I
I
I
O
–
O
O
O
O
O
O
O
O
I
O
• Abbreviation
GFS: Guard Frame Sync
Function
System reset
Used in 1-track jump mode (Connected to +5v)
SENS serial data read-out clock
Defect selection pin (Connected to Ground)
Input pin for anti-shock (Connected to Ground)
Serial data input, supplied from CPU
Latch input, supplied from CPU
Serial data transfer clock input, supplied from CPU
Numbers of track counted signal output (Open)
Digital power supply
Mirror signal output (Open)
Defect signal output (Open)
Focus OK output (Open)
Output to select spindle motor output filter (Open)
Output to control ON/OFF of spindle motor (Open)
Output to control spindle motor servo
Output to control spindle motor servo (Open)
GFS is sampled by 460 Hz. H when GFS is H (Open)
Input signal to detect disc inner most track
Sled drive output

— 16 —
• IC201 System Control (CXD84124-043Q)
Pin Name
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
WE
LED-PLAY
LED-PAUSE
PLAY
SPDL-MUTE
DITHER MODE
VOL UP
VOL DOWN
BLK
D0
D1
D2
CLK
WR
SENSER SW
SENSER
LIMIT OUT
RESET
XTAL 1
XTAL 0
VSS
AVSS
AVREF
K0
K1
K2
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
O
O
O
O
O
O
O
O
I
I
I
I
O
–
–
–
–
–
I
I
I
Function
Output of address to S.REM (LH5160T4)
Output of write inable to S.REM
Not used (Open)
PLAY Lamp output “H”: ON
PAUSE Lamp output “H”: ON
Open
Drive IC MUTE output for spindle. “L”: ON
D/F dither mode control input
Headphone motor volume up output (Not used)
Headphone motor volume down output (Not used)
Blank output to fluorescent indicator tube driver. (LC7570E). When the indicator tube lights: “H”
Serial data output to fluorescent indicator tube driver. (LC7570E)
Clock output to fluorescent indicator tube driver. (LC7570E)
Latch output to fluorescent indicator tube driver. (LC7570E)
Senser powr supply ON/OFF control output for stabilizer detection (Not used)
Stabilizer detection input (Not used)
Sled out switch input “L”: SW ON
Microcomputer reset input
Oscillator connector pin (10 MHz)
Connected to Ground
Not used (Open)
A/D converter Ground
A/D converter reference voltage input (Connected to +5V)
Key data input (A/D input). When the key is not pressed: ”H” (Connected to +5V)
Key data input (A/D input). When the key is not pressed: ”H”
Key data input (A/D input). When the key is not pressed: ”H” (Connected to +5V)

— 17 —
Pin Name
K3
K4
K5
ADJ/AFJ
IN/OUT SW
SCLK
PRGL
CLK
SENSE
DATA
SQCK
SUBQ
TEST
SEL 1
SEL 0
RMIN
TIMER
TEST
TEST
SCOR
AMUTE
LDON
XLT
LOAD OUT
LOAD IN
DOUT
DMUTE
D0
D1
D2
D3
VDD
NC
D4
D5
D6
D7
A0
A1
A2
Pin No.
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
I/O
I
I
I
I
I
O
O
O
I
O
O
I
O
I
I
I
I
O
O
I
O
O
O
O
O
O
O
I/O
I/O
I/O
I/O
I
–
I/O
I/O
I/O
I/O
O
O
O
Function
Key data input (A/D input). When the key is not pressed: “H” (Connected to +5V)
Key data input (A/D input). When the key is not pressed: “H”
Model distinction (Connected to +5V)
Test mode input. The equipment is fixed at “H”
Disc lid Open/Close
Serial read out data read out clock output to CXD2515AQ
Program latch to digital filter
Serial data transfer clock output to CXD2515AQ, CXD8504M
SENSE signal input from CXD2515AQ
Serial data output to CXD2515AQ, CXD8504M
Sub code Q read out clock output to CXD2515AQ
Sub code Q data input from CXD2515AQ
Not used (Open)
Model distinction (Connected to Ground)
Remote contrl signal input
Not used (Connected to +5V)
Not used (Open)
Sub code sync input from CXD2515AQ. Start to read out the sub code receiving this signal
Analog mute output. “H” mute on
Laser diode ON/OFF control output “H”: ON
Serial data latch output to CXD2515AQ
Output to rotate loading motor in the loading out direction. “H”: OUT (Open)
Output to rotate loading motor in the loading in direction. “H”: IN (Open)
Digital output ON/OFF control output
Muting control output
Input and output of data signal with S. RAM (LH5160T4)
Power supply terminal (+5V)
Connected to +5V
Input and output of data signal with S. RAM (LH5160T4)
Address signal output to S. RAM (LH5160T4)

— 18 —
• Main Ports
!¶ SPINDLE MUTE
The disc must not move nor sway when the disc lid opens. These
problems however occur in the actual case due to the offset volt-
age generated and the voltage generated because of the positional
relation between the BSL coil and Hall element.
The BSL (IC104, IC105) driver is therefore muted while the lid is
open.
@¡ BLANK
This port is required because the display tube in this set static-
lights up and a dedicated screwdriver is required.
It is basically a RESET pin. But as problems will occur if used
also as RESET , timings are specially provided using the micro-
processor.