LG TCH-800 User manual

- 1-1 -
❍SECTION 1. SUMMARY
• SERVICING PRECAUTIONS .......................................................................................................... 1-2
• ESD PRECAUTIONS....................................................................................................................... 1-3
• SPECIFICATIONS ........................................................................................................................... 1-4
❍SECTION 2. ELECTRICAL
• ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................. 2-1
• INTERNAL BLOCK DIAGRAM of ICs.............................................................................................. 2-7
• BLOCK DIAGRAM ......................................................................................................................... 2-23
• MAIN SCHEMATIC DIAGRAM ...................................................................................................... 2-25
• CDP SCHEMATIC DIAGRAM ....................................................................................................... 2-27
• PRINTED CIRCUIT DIAGRAM...................................................................................................... 2-29
❍SECTION 3. CABINET MAIN CHASSIS & MECHANISM
• EXPLODED VIEW ........................................................................................................................... 3-1
❍SECTION 4. REPLACEMENT PARTS LIST ................................................................... 4-1
[CONTENTS]

- 1-2 -
❏SERVICING PRECAUTIONS
➊Always disconnect the power source before:
1) Removing or reinstalling any component, circuit board, module or any other instrument assembly.
2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection.
3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in
an explosion hazard.
➋Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service
manual might be equipped.
❸Do not apply power to this instrument and or any of its electrical assemblies unless all solid-state
device heat sinks are correctly installed.
❹Always connect a test instrument’s ground lead to the instrument chassis ground before
connecting the test instrument positive lead. Always remove the test instrument ground lead last.
1) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing,
follow the printed or indicated service precautions and service materials.
2) The Components used in the unit have a specified conflammability and dielectric strength. When
replacing any components, use components which have the same ratings. Components marked in
the circuit diagram are important for safety or for the characteristics of the unit. Always replace with the
exact components.
3) An insulation tube or tape is sometimes used and some components are raised above the printed writing
board for safety. The internal wiring is sometimes clamped to prevent contact with heating components.
Install them as they were.
4) After servicing always check that the removed screws, components and wiring have been installed
correctly and that the portion around the service part has not been damaged. Further check the insulation
between the blades of attachment plug and accessible conductive parts.
SECTION 1. SUMMARY

- 1-3 -
❏ESD PRECAUTIONS
[Electrostatically Sensitive Devices (ESD)]
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such omponents
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are
integrated circuits and some field-effect transistors and semiconductor chip components. The following
techniques should be used to help reduce the incidence of component damage caused by static electricity.
1) Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain
off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and
wear a commercially available discharging wrist strap device, which should be removed for potential
shock reasons prior to applying power to the unit under test.
2) After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive
surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3) Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4) Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage ESD devices.
5) Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6) Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together
by conductive foam, aluminum foil or comparable conductive material).
7) Immediately before removing the protective material from the leads of a replacement ESD device, touch
the protective material to the chassis or circuit assembly into which the device will be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8) Minimize bodily motions when handling unpackaged replacement ESD devices. (Otherwise harmless
motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor
can generate static electricity sufficient to damage an ESD device).
[CAUTION. GRAPHIC SYMBOLS]
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL
TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE
OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT
MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO
ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY
INFORMATION IN SERVICE LITERATURE.

1. GENERAL
Power requirements ..................................................................................................................... DC12V~15V
Ground system ................................................................................................................................... Negative
Dimensions(W x H x D) ................................................................................................... 178 x 50 x 152.5mm
Weight .............................................................................................................................................. Net: 1.4kg
2. RADIO SECTION
FM AM(MW) LW(Optional)
Frequency range ................................. 65.0~74.0MHz(Optional), 522~1,620kHz 144~281kHz
87.5~108MHz (Optional:530~1,710kHz/
520~1,620kHz)
Intermediate frequency ....................... 10.7MHz 450kHz 450kHz
Usable sensitivity ................................ 10dBµV 33dBµV 38dBµV
Signal to noise ratio ............................ 60dB 50dB 50dB
3. COMPACT DISC SECTION
Frequency response..................................................................................................................... 40Hz~20kHz
Channel separation ...................................................................................................................... 50dB(1kHz)
Signal to noise ratio .................................................................................................................................. 60dB
4. AUDIO SECTION
Maximum output power ....................................................................................................................... 50W x 4
Frequency response ............................................................................................................ 40Hz to 14,000Hz
Speaker impedance ............................................................................................................... 4Ωx 4 or 8Ωx 4
Signal to noise ratio ................................................................................................................................. 60dB
NOTE: The design and specifications are subject to change without notice in the sourse of product
improvement.
❏SPECIFICATIONS
- 1-4 -

- 2-1 -
SECTION 2. ELECTRICAL
❏ELECTRICAL TROUBLESHOOTING GUIDE
(1) No Power
ANY KEY POWER ON
YES
YES
YES
YES
YES
YES
NO Check power supply circuitry.
Q505, Q506, IC201 Pin 39, Pin 87.
NO Check Loading supply circuitry.
Q401~ Q404, CW001 pin25,
IC201 pin44.
NO Check laser circuitry.
CDP P43: TR1, IC101, IC201, IC301
Check focusing circuitry.
CDP PCB: IC101, IC201, IC301.
Check DISC.
NO Check tracking servo circuitry.
CDP PCB : IC101, IC201, IC301.
NO Check audio circuitry.
IC201, IC302 CDP PCB: IC101, IC201.
Is power turned on?
DISC loading?
Does initial reading occur?
Can disc be played?
Is audio output supplied?
OK

- 2-2 -
(2) LCD light abnormal
ANY KEY POWER ON
(without DISC)
YES
NO Check voltage in the power
supply circuitry.
YES
Is u-com IC201 reset circuit
normal? Pin86
4.8V
0V
NO Power supply circuitry defective.
Q501, Q502, Q506, IC201
NO Reset circuit defective.
IC201, Q505, Q506.
YES
Is u-com IC201 Xin,Xout terminal
Pin 1,100 input?
OSC : 4.5MHz
NO
CT201, CC201, CC202 defective.
YES
Is u-com IC201 keyin Pin7 Pin45
0volt input?
NO CN201,front PCB pattern
defective.
YES
Is u-com IC201 Pin46, 47, 48
output waveform normal?
5V
NO IC201 pin46~48,front PCB
pattern defective.
Is IC701 com1, com2, com3
output waveform normal?
Display LCD connector defective.
5V
NO IC701 Surrounding circuit PCB
pattern defective.
Do display LCD then light?

- 2-3 -
(3) Initial reading is not carried out (with disc)
DISC loading?
YES
NO
NO
NO
NO
NO
NO
NO
NO
Is IC201 pin21 input waveform
normal?
IC201
pin21 open close
YES
Does laser light?
CDP PCB: CON1 pin14(LD)
YES
YES
YES YES
Is signal output at tracking
output IC501 Pin 53 (CDP PCB)?
Does IC201 Pin25(LKFS) GFS
as figure?
Disc initial reading damaged or
defective.
Disc defective.
Is rotation normal?
Is there any irregularity in
frequency?
YES
Is RF signal normal without
dropout?
NO
Check voltage in the power
supply circuitry .
Q505, R506, IC201 pin39, pin87
CDP PCB: IC301.
NO Leaf SW contact defective.
Connector defective.
Pattern short.
NO (A)
(B)
Does disc motor rotate?
Is RF wave output?
RF
Is tracking servo operating?
Is the lower envelope of RF
waveform flat?
Is signal output at TEO? Is signal output at IC101
Pin50 (CDP PCB)? IC501
(CDP PCB) defective.
Pattern defective.
Connector defective.
Pick-up defective.
IC502 (CDP PCB) defective.
NO
IC201(CDP PCB) defective.

- 2-4 -
(A) when laser does not light.
Is below signal “L” at IC101
Pin 70
(CDP PCB) ?
NO
NO
NO
NO NO
NO
NO
NO
YES
Slide motor defective.
Connector defective.
YES
IC301 defective.
IC101defective.
IC101 (CDP PCB) defective.
Surrounding circuitry defective
TR (CDP PCB) defective.
Connector defective.
Laser defective
Connector defective.
Laser defective
IC101,201 (CDP PCB) defective.
NO
NO
Reset SW defective
Connector defective.
NO
IC201 defective.
Has Pick-up returned to the
innermost position?
Does pick-up stop after having
moved to the innermost position?
IC201 Pin 25
Has laser power source returned
to the TR1 (CDP PCB) ?
(TR1 collector voltage about
2.2V)
Flow laser current?
Both voltage of TR1 (CDP PCB)
is about 1.0V?
NO
YES
R40 (CDP PCB)
R40 (CDP PCB)
Are data transferred from
IC201 Pin 27, 28, 37?
Is below signal output at IC201
Pin 26,27
(CDP PCB) ?
Are detect output input at IC101
Pin38
(CDP PCB) ?

- 2-5 -
(B) when laser light.
Do lenses move up and down?
Insert disc and
in the case of
check of initial
leading.
Is RF(HF) signal waveform
output?
NO
NO
Is signal output at focus search
terminal? IC101 Pin48 (CDP PCB)
NO IC101
(CDP PCB) defective.
Is signal output at IC301
Pin1, 2 (CDP PCB) ?NO IC301 defective.
YES
YES
YES
Actuator short.
Connector short.
IC101 (CDP PCB) defective.
Connector short.
The waveform of RF(HF) is
below figure?
Amplitude
0.5~1.0v
NO
YES
IC101 (CDP PCB) defective.
TR1, IC101 (CDP PCB)
surrounding circuitry defective.
Is FOK signal output? RF(HF)
0.4V over OK.
FOK
NO
YES
IC101 (CDP PCB) defective.
Is FOK signal to IC201 Pin41?
(C)
FOK
NO
YES
Pattern defective.
YES

- 2-6 -
(C)
YES
NO IC101
(CDP PCB) defective.
Pick-up defective.
Connector defective.
Is FE1 signal output ?
IC501 Pin59
YES
NO IC101
(CDP PCB) defective.
Is FE1 signal output at IC101
(CDP PCB)
Pin31(ISTAT) ?
YES
NO Pattern defective between IC201
Pin 72, 73, 75, 76 (CDP PCB)
and IC201(Main).
Is SMON signal output by IC201
(CDP PCB) Pin73?
Is SMPO signal output by IC201
(CDP PCB) Pin75?
YES
NO IC101,305
(CDP PCB) defective.
Surrounding circuitry defective.
Has voltage at disc motor?
0v
YES
Disc motor defective.
CN101(CDP PCB) connector defective.
ISTAT
FE1

- 2-7 -
❏INTERNAL BLOCK DIAGRAM of ICs
■IC201 LC723764 (Micro-processor IC)
1) PORT ASSIGNMENT

- 2-8 -
2) PORT DESCRIPTION
PIN ASSIGN NAME I/0 ACT DESCRIPTION
1 XIN I - 4.5 MHz CRYSTAL INPUT
2 TEST2 - - MCU TEST Port.Must be connected to GND.
3 VREG O - BYPASS-CONDENSER Connecting PORT.
4 VSSCPU Voltage Supplied PORT.(4.5V ~ 5.5V)
5 NC SI0/PG3 I/O - No connection
6 NC SO0/PG2 I/O - No connection
7 PDTHSW SCK0/PG1 I/O - Front Panel connecting Detection PORT.
Connection:LOW,/ Disconnection:HIGH
Will be ignored the Key data for 2sec after High ➞ Low.
8 PEJECTKEY PG0 I/O H CDP Model Disc EJECT Key Input PORT.
Logic Deck Model Tape EJECT KEY Input PORT.
9 LCD SI SI1/PF3 II/O I LCD &KEY DRIVER IC INTERFACE PORT.
10 LCD DO SO1/PF2 I/O O
11 LCD CLK SCK1/PF1 I/O O
12 LCD CE PF0 I/O O
13 SQDT SI2/PE3 I/O I SUBQ DATA INUT PIN.
14 PTEST SO2/PE2 I/O - TEST PORT
15 SQCK SCK2/PE1 I/O O SUBQ DATA SYNC CLOCK OUTPUT.
16 ISTAT PE0 I/O I ISTAT INPUT PIN
17 LKFS PD3 I/O -
18 W-LED PD2 I/O O WARING LED Output Port on the Front Panel-Off.
250ms->HIGH and then 750ms ➞ LOW,repeatly
19 T-PLSUP PD1/INT5 I/O I SEARCH(Right)ENCODER Switch Input PORT.
IOS1 7,1XXX IOS1 7,1000B IOS1 1,3H
20 E-PLSUP PD0/INT4 I/O I VOLUME(Left)ENCODER Switch Input Port.IOS1 8,XX1X
21 CDSENSER PC3 1/O H CDP DECK SENSER ON PORT.
22 CHUCK SW PC2 I CDP DISC Loading SW.LOW ➞ DISC IN,HIGH ➞ DISC OUT
23 S0 PC1 I CDP DISC LOAD SW.LOW ➞ DISC OUT,HIGH ➞ DISC IN
24 S1 PC0 I CDP DISC EJECT SW.LOW ➞ DISC OUT,HIGH ➞ DISC IN
25 XREST PB3 O - CDP LSI RESET OUTPUT PORT.
26 NC PB2 O -
27 MLT PB1 O - CDP LSI CONTROL DATA LATCH OUTPUT PORT.
28 MDATA PB0 O CDP LSI CONTROL DATA OUTPUT PORT.
29 OPTION IN PA3 I - OPTION DIODE MATRIX INPUT PORT.
30 OPTION IN PA2 I OPTION DIODE MATRIX INPUT PORT.
31 OPTION IN PA1 I OPTION DIODE MATRIX INPUT PORT.
32 OPTION IN PA0 I OPTION DIODE MATRIX INPUT PORT.
33 OPTION OUT PT1 O - OPTION DIODE MATRX OUTPUT PORT.
34 OPTION OUT PT0 O OPTION DIODE MATRX OUTPUT PORT.
35 OPTION OUT PS3 O OPTION DIODE MATRX OUTPUT PORT.
36 OPTION OUT PS2 O OPTION DIODE MATRX OUTPUT PORT.
37 MCK PS1 O CDP LSI CONTROL DATA CLOCK OUTPUT PORT.
38 TRCNT PS0 I - TRACK CONTROL INPUT PIN.
39 VDDPORT - - Voltage Supplied POR.(4.5V ~ 5.5V)
40 VSSPORT Voltage Supplied POR.(4.5V ~ 5.5V)
41 FOK PR3 I - FOCUS STATE INPUT :"H"=FOCUS O.K
42 MEJECT PR2 O H LOGIC DECK MAIN MOTOR CONROL PORT.
43 MLOAD PR1 O H LOGIC DECK MAIN MOTOR CONROL PORT.
44 CDP ON PR0 O H CDP DECK MAIN POWER ON/OFF PORT.
45 PANNEL PQ3 I H DETACHABLE ON/OFF INPUT PORT.
CONTACT ➞ LOW SEPARATE ➞ HIGH.
46 ECE PQ2 O - EVR IC INTERFACE PORT.
47 EDO PQ1 O EVR IC INTERFACE PORT.
48 ECLK PQ0 O EVR IC INTERFACE PORT.
49 POWER ON PP3 O H POWER CONTROL PORT.
POWER OFF ➞ LOW,POWER ON ➞ HIGH
50 TAPE IN PP2 I H TAPE INSERT DETECTION PORT.

- 2-9 -
PIN ASSIGN NAME I/0 ACT DESCRIPTION
51 MOTOR ON PP1 O H TAPE MAIN MOTOR ON PORT
52 TAPE ON PP0 O H TAPE ON PORT.
53 MO1 PO3 O H SUB MOTOR CONTROL PORT
54 MO2 PO2 O H SUB MOTOR CONTROL PORT
55 STAND-BY PO1 I H STAND-BY MODE DETECTOR PORT
56 MODE SW PO0 O - TAPE HEAD LOCATION CHECK PORT
57 REEL OUT PN3 I - TAPE REEL CHECK PORT
58 FF PN2 O H TAPE MUTE PORT
59 AMS PN1 I H AMS MUTE DETECTOR PORT
60 BEEP PN0/BEEP O - BEEP OUT PORT
61 MTL PM3 I METAL CHECK PORT
62 F/R PM2 O - TAPE HEAD DETECTOR PORT
63 PHONE IN PM1 I H PHONE MUTE REQUEST PORT
64 T-MUTE PM0 O H TEL MUTE PORT
65 A-MUTE PL3 O H AUDIO MUTE PORT
66 BAND1 PL2 O - RADIO BAND SELECTION PORT
67 BAND2 PL1 O RADIO BAND SELECTION PORT
68 IF REQUEST PL0 O H IF COUNT REQUESTPORT
69 NC PK3/INT3 No connection
70 SOSI PK2/INT2 O L OUTPUT OF SUBCODE SYNC SIGNAL PORT
71 RDS CLK PK1/INT1 I - RDS DATA CLOCK PORT
72 CDC IN PK0/INT0 I - CDC DATA IN PORT
73 CDC DATA PJ3 O - CDC COMMAND OUTPUT PORT
74 CDC ON PJ2 O - CDC ON PORT
75 NC PJ1 No connection
76 LO/DX PJ0 O L OCAL /DX MODE SELECTION PORT
77 LEVELMETER PI3/ADI7 I - EQ INPUT PORT
78 RDS DATA PI2/ADI6 I - RDS DATA INPUT PORT
79 E-PLSDN PI1/ADI5 I I VOLUME(LEFT)ENCODER SWITCH Input PORT.IOS1 8,XX1X
80 NC PI0/ADI4 No connection
81 T-PULSEDN VSSADC I - TUNER ENCODER Input Supplied Voltage Port.(4.5V ~5.5V)
82 SD PH3/ADI3 I H RADIO SD CHECK
82 T-PLSDN PH3/ADI3 I I SEARCH(Right)ENCODER Switch INPUT PORT.
IOS1 7,1XXX IOS1 7,1000B IOS1 1,3H
83 ST PH2/ADI2 I H RADIO STEREO CHECK PORT
84 SM PH1/ADI1 I H RADIO SM CHECK PORT
85 PH0/ADI0
86 /RESET I - SYSTEM RESET PORT.
87 ACC /HOLD I H ACC PORT
88 /SNS I - Voltage SENSE or INPUT PORT.
89 LCTR(IN) I - UNIVERSAL-COUNTER(Low-Freq)or INPUT PORT.
90 HCTR(IN) I - UNIVERSAL-COUNTER or INPUT PORT.
91 EO3(IN) I/O - 2ND PLL-CHARGE PUMP OUTPUT PORT or Common PORT.
92 SUBPD(IN) I/O - SUB-CHARGE PUMP OUTPUT PORT or Common PORT.
93 VDDPLL Voltage Supplied PORT.(4.5V °≠5.5V)
94 AMIN I - AM VCO INPUT PORT.
95 FMIN I - FM VCO INPUT PORT.
96 VSSPLL Voltage Supplied PORT.(4.5V °≠5.5V)
97 EO2 O - MAIN CHARGE PUMP OUTPUT PORT.
98 EO1 O - MAIN CHARGE PUMP OUTPUT PORT.
99 TEST1 - - MCU TEST PORT.Must be connected to GND.
100 XOUT O - 4.5 MHz CRYSTAL Connected PORT.

- 2-10 -
■IC301 LC75421M (Electronic Volume controller IC)
PORT ASSIGNMENT

- 2-11 -
■IC701 LD4104 (LCD Driver IC)
Block Diagram
Pin Diagram

- 2-12 -
■KB9223 (IC101 on CDP PCB: SSP)
OVERVIEW
The KB9223 is a 1-chip BICMOS integrated circuit to perform the func-
tion of RF AMP and Servo signal processor for compact disc player
application. It consist of blocks for RF signal processing, focus, tracking,
sled and spindle servo. Also this IC has adjustment free function and
embedded opamp for audio post filter.
FEATURES
• RF amplifier & RF equalizer
• Focus error amplifier & servo control
• Tracking error amplifier & Servo control
• Mirror & Defect detector circuit
• Focus OK detractor circuit
• APC(Auto Laser Power Control) circuit for constant laser power
• FE bias & focus servo offset adjustment free
• EF balance & tracking error gain adjustment free
• Embedded audio post filter
• The circuit for Interruption countermeasure
• Double speed play available
• Operating voltage range 5V
PIN CONFIGURATION
ORDERING INFORMATION
APPLICATIONS
• CD PLAYER
• Video-CD
RELATED PRODUCT
• KS9286 Data Processor
• KS9284 Data Processor
• KS9258D/KA9259D Motor Driver
Device Package Temp. Range
KB9223 80-QFP-1420C -20~+70ºC
#1
80-QFP-1420C

- 2-13 -
PIN DESCRIPTION
1 MCP Capacitor connection pin for mirror hold
2 DCB Capacitor connection pin for defect Bottom hold.
3 FRSH Capacitor connection pin for time constant to generate focus search waveform
4 DCC2 The input pin through capacitor of defect bottom hold output
5 DCC1 The output pin of defect bottom hold
6 FSET
The peak frequency setting pin for focus, tracking servo and cut off frequency CLV LPF
7 VDDA Analog ACC for servo part
8 VCCP VCC for post filter
9 GC2I Amplifier negative input pin for gain and low pass filtering of DAC output CH2
10 GC2O Amplifier output pin for gain and low pass filtering of DAC output CH2
11 CH2I The input pin for post filter channel2
12 CH2O The output pin for post filter channel2
13 CH1O The output pin for post filter channel1
14 CH1I The input pin for post filter channel1
15 GC1O Amplifier output pin for gain and low pass filtering of DAC output CH1
16 GC1I Amplifier negative input pin for gain and low pass filtering of DAC output CH1
17 RRC The pin for noise reduction of post filter bias
18 VSSP VSS for post filter
19 MUTEI The input pin for post filter muting control
20 ISET The input pin for current setting of focus search, track jump and sled kick voltage
21 VREG The output pin of regulator
22 WDCK The clock input pin for auto sequence
23 SMDP The input pin of CLV control output pin SMDP of DSP
24 SMON The input pin for spindle servo ON through SMON of DSP
25 SMEF The input pin of provide for an external LPF time constant
26 FLB Capacitor connection pin to perform rising low bandwidth of focus loop
27 FS3 The pin for high frequency gain change of focus loop with internal FS3 switch
28 FGD Reducing high frequency gain with capacitor between FS3 pin
29 LOCK Sled runaway prevention pin
30 TRCNT Track count output pin
31 ISTAT Internal status output pin
32 ASY The input pin for asymmetry control
33 EFM EFM comparator output pin
34 VSSA Analog VSS for servo part
35 MCK Micom clock input pin
PIN DESCRIPTION
Pin No. Symbol Description

- 2-14 -
PIN DESCRIPTION
Pin No.
36 MDATA Micom data input pin
37 MLT Micom data latch input pin
38 RESET Reset input pin
39 MIRROR The mirror output for test
40 FOK The output pin of focus OK comparator
41 SSTOP The pin for detection whether pick_up position is innermost or ton
42 SL+ The noninverting input pin of sled servo amplifier
43 SLO The output pin of sled servo amplifier
44 SL- The inverting input pin of sled servo amplifier
45 SPDL- The noninverting input pin of spindle servo amplifier
46 SPDLO The output pin of spindle servo amplifier
47 FE- The inverting input pin of focus servo amplifier
48 FEO The output pin of focus servo amplifier
49 TE- The inverting input pin of tracking servo amplifier
50 TEO The output pin of tracking servo amplifier
51 ATSC The input pin for Anti-shook detection
52 TZC The comparator input pin for tracking zero crossing detection
53 TE2 Tracking servo input pin
54 TE1 Tracking error amplifier output pin
55 LPFT The input pin of tracking error low pass filtering signal
56 DVDD The power supply pin for logic circuit
57 TDFCT The capacitor connection pin for tracking defect compensation
58 FE2 Focus servo input in
59 FE1 Focus error amplifier output pin
60 FDFCT The capacitor connection pin for focus defect compensation
61 TGU The capacitor connection pin for high frequency tracking gain switch
62 TG2
The pin for high frequency gain change of tracking servo loop with internal TG2 switch
63 FEBIAS Focus error bias voltage control pin
64 DVEE The DVEE pin for logic circuit
65 PD1 The negative input pin of RF I/V amplifier1(A+C signal)
66 PD2 The negative input pin of RF I/V amplifier2(B+D signal)
67 F The negative input pin of F I/V amplifier(F signal)
68 E The negative input pin of E I/V amplifier(E signal)
69 PD The input pin for APC
70 LD The output pin for APC
Symbol Description

- 2-15 -
PIN DESCRIPTION
BLOCK DIAGRAM
Pin No.
71 VR The output pin of(AVEE+AVCC)/2 voltage
72 VCC VCC for RF part
73 RF- RF summing amplifier inverting input pin
74 RFO RF summing amplifier output pin
75 IRF The input pin for AGC
76 EQO The output pin for AGC
77 RFI The input pin for EFM comparison
78 EQC The capacitor connection pin for AGC
79 EI Feedback input pin of E I/V amplifier EF Balance control
80 GND GND for RF part
Symbol Description

- 2-16 -