Pioneer YPM-MG2196ZF Service Manual Download Page 53

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YPM-MG2196ZF

7.3.1 CIRCUIT DESCRIPTIONS

1 Preamplifier (UPC2572GS: IC101)

The preamplifier processes pickup output signals to

generate signals to be sent to the servo, demodulator,

and controller. The preamplifier with built-in photode-

tector converts signals from the pickup into intermedi-

ate voltage in the pickup. Then, addition is made in the

RF amplifier (IC101) to obtain RF, FE, TE, and TE zero

cross signals. The system consists of the UPC2572GS

and other components explained below. The system

uses a single power source (+5 V). Therefore, the refer-

ence voltage of IC101 and the reference voltage of the

power unit and servo circuit are REFOUT (+2.5 V). REFO

UT is obtained from REFOUT of servo LSI (IC201:

UPD63702GF) via a buffer, and is output from Pin 19 of

IC101. This REFOUT is used as reference for all mea-

surements.

Note:Do NOT short-circuit REFOUT and GND during

measurement.

X12

envelope

AGC

Detection

Phase detection

3T detection

Bottom

DC shift

Peak

Control

DC shift

Bottom

Peak

120k

Ω

DEFECT circuit

FE BAL

BAL

Vcc

Mirror circuit

FE BAL

APC

Vcc

FE-BAL

TE-BAL

ASY

EFM-OUT

C.DEF

DEFECT

RFOK

MIRR

3T-OUT

C.FE

FE-OUT

FE-

GND

TE-

TE-OUT1

TE-OUT2

DET-IN

DET-OUT

VREF-IN

VREF-OUT

LDON

Vcc

C2.3T

C1.3T

RF-

RF-OUT

RF-IN

C AGC

AGC-OUT

EFM-IN

HPF

BAL

EFM comparator

Control

Fig. 1 Block Diagram of UPC2572GS

1) Automatic Power Control (APC) circuit

Laser diode has negative temperature characteristics

with great optical output when the diode is driven with

constant current. Therefore, current must be controlled

by a monitor diode to ensure constant output. Thus

functions the APC circuit. LD current can be obtained by

measuring the voltage between LD1 and GND. The cur-

rent value is approximately 35 mA.

Vcc (5V)

UPC2572GS

Q101
2SD1664

C124
0.1

C101
(100

F/6.3V)

R101
10

Ω

LD1

R102
12

Ω

CONT

Q102 UMD2N

Ω

150k

Ω

16k

Ω

R112
2.2k

Ω

C104
0.33

Ω

2.5V

Pickup unit

Fig. 2 APC Circuit

Voltage between LD1 and GND(mv)

LD current(mA) =

Ω

+ 12

Ω

7.3 EXPLANATION

Summary of Contents for YPM-MG2196ZF

Page 1: ...CTRONIC CORPORATION 1999 K ZZS JUNE 1999 Printed in Japan ORDER NO CRT2389 CD PLAYER Service Manual FORD CONTENTS 1 SAFETY INFORMATION 2 2 EXPLODED VIEWS AND PARTS LIST 4 3 BLOCK DIAGRAM AND SCHEMATIC DIAGRAM 8 4 PCB CONNECTION DIAGRAM 18 5 ELECTRICAL PARTS LIST 30 6 ADJUSTMENT 33 7 GENERAL INFORMATION 36 7 1 DIAGNOSIS 36 7 1 1 TEST MODE 36 7 1 2 DISASSEMBLY 43 7 2 IC 49 7 3 EXPLANATION 53 7 3 1 C...

Page 2: ...As the ACC is turned on the disc indicator blinks in red 3 When the blinking is stopped the mechanism is ready for the transportation 4 Attach the Transportation Bracket CNC7878 Now you can transport it See the figure below This service manual is intended for qualified service technicians it is not meant for the casual do it yourselfer Qualified technicians have the necessary test equipment and to...

Page 3: ...3 YPM MG2196ZF ...

Page 4: ...4 YPM MG2196ZF 2 EXPLODED VIEWS AND PARTS LIST 2 1 CD MECHANISM ...

Page 5: ...onnector CDE5685 44 Connector CDE5686 45 Roller CLA3154 46 Roller CLA3157 47 Roller CLA3159 48 Roller CLA3160 49 Shaft CLA3179 50 Spacer CLA3194 51 Roller CLA3248 52 Bush CLA3353 53 Shaft CLA3469 54 Shaft CLA3693 55 Chassis CNA2067 56 Case CNB2335 57 Steer CNC7215 58 Steer CNC7216 59 Cam CNC7227 60 Holder CNC7235 61 Gear CNC7236 62 Gear CNC7238 63 Lever CNC7243 64 Lever CNC7244 65 Lever CNC7245 66...

Page 6: ...r CNM6345 139 Sheet CNM6414 140 PCB CNP4978 141 Ball CNR1189 142 Bearing CNR1423 143 Belt CNT1079 144 Holder CNV5037 145 Guide CNV5040 146 Clamper CNV5042 147 Rack CNV5111 148 Arm CNV5579 149 Holder CNV5759 150 Chassis Unit CXB2698 151 Arm Unit CXB2705 152 Motor Unit M4 Carriage CXB3178 153 Screw Unit CXB3179 154 Guide Unit CXB4417 155 Lever Unit CXB4450 156 157 CBL1444 158 Motor M5 Spindle CXM112...

Page 7: ...07 197 Chassis Unit CXB4315 198 Arm Unit CXB4953 199 Arm Unit CXB4954 200 Photo Transistor Q881 CPT231SXTD 201 Switch Max Detect CSN1052 202 Washer YE15FUC 203 PU Unit P8 Service CXX1312 204 LED D891 892 CL202IRXTU 205 Resistor R872 RS1 8S821J 206 Resistor R871 RS1 8S911J 207 Switch ELV S886 CSN1052 208 Switch Clamp S887 CSN1051 Mark No Description Part No ...

Page 8: ... PH2 MAXSW M LOADING MOTOR PH1 Q876 Q877 D891 D892 D883 Q881 S885 MAX DETECT PVD PH2 6 ELHOME CLAMP S886 ELV HOME S887 CLAMP DOORSW LOADSW MODESW MOTOR PCB A FORD PCB PCB UNIT C S867 DOOR S868 LOAD S866 MODE 11 10 11 10 2 1 2 1 3 9 7 5 3 9 7 5 DOORSW LOADSW MODESW CN801 CN802 CN873 1 3 4 1 3 4 2 1 1 1 1 2 3 1 2 3 LOAD MOTOR PCB PHOTO L PCB PCB UNIT A M2 Q1 M1 M3 8 3 4 2 1 9 10 11 12 14 4 3 1 3 5 6...

Page 9: ... DRIVER IC801 LB1836M 2 6 13 9 PVD Q802 Q801 LOAD VD SYSTEM CONTROLLER IC701 PD5467B 60 59 58 57 78 77 76 ELV1 ELV2 LO1 LO2 PH2 PH1 MAXSW LOAD ELHOME CLAMPSW ELHOME CLAMP 55 6 5 CG1 CG2 62 61 IC702 BA05SFP 2 1 4 VM V 5V 5V REGULATOR POWER 26 27 53 Q602 Q603 CD MUTE 56 IC503 PD4501B DIGITAL COMPRESSION 11 X701 28 29 EMPH CONT CDMUTE XIN XOUT VDD 3 8 17 18 VD DOORSW 2 LOADSW 17 MODESW 18 CN701 79 EL...

Page 10: ...OR DRIVER MOTOR DRIVER 5V REGULATOR RF AMP CD 4CH DRIVER DIGITAL SERVO PROCESSOR DIGITAL SIGNAL PROCESSOR A CD CORE UNIT B CN861 H CN873 A 3 2 CD CORE UNIT Note When ordering service parts be sure to refer to EXPLODED VIEWS AND PARTS LIST or ELECTRICAL PARTS LIST ...

Page 11: ...11 YPM MG2196ZF 5 6 7 8 5 6 7 8 D C B A A MUTE SHOCKPROOF CONTROL DRAM 8fs DF D A LPF DIGITAL COMPRESSION M ROLLER CESSOR CESSOR ...

Page 12: ...v 8 CH1 TEY 0 5V div 9 CH2 TIN 0 5V div Test mode 32 tracks jump FWD 0 5ms div 8 CH1 TEY 0 5V div 9 CH2 TIN 0 5V div Test mode Single jump FWD 0 5ms div 6 CH1 FEY 0 1V div 3 CH2 FIN 0 2V div Normal mode Play 20ms div 3 CH1 FIN 0 5V div 0 CH2 SIN 1V div Normal mode Focus close 0 5s div GND GND GND GND Waveforms 0 SIN 0 5V div 0 1s div Normal mode Play REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOU...

Page 13: ...en 2ms div 6 CH1 FEY 0 2V div 3 CH2 FIN 0 5V div Normal mode During AGC 1ms div EFM 1V div 2µs div Play 0 2s div Dout 2V div 5µs div Play LRCK 2V div 10µs div ADRMON 1V div 1s div Normal mode Starting play GND REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT REFOUT 1 CH1 RFO 1V div CH2 HOLD 5V div Normal mode The defect part passes 800µm 500µs div REFOUT R...

Page 14: ...5V div Test mode 100 tracks jump FWD 8 CH1 TEY 0 5V div 9 CH2 TIN 0 5V div Normal mode Play 10ms div 5ms div REFOUT REFOUT SCKO 2V div 500ns div Play REFOUT CH1 RCH 2V div CH2 LCH 2V div Normal mode PLAY 0dB 1kHz 200µs div AAGND AAGND REFOUT REFOUT ...

Page 15: ...75 ELV SENSE MOTOR PCB A M5 SPINDLE CXM1120 DISC INSERT DETECT M4 CARRIAGE CXB3178 MOTOR PCB B SIDE PCB B D C A BVD CONT1 VREF HOME PGND SIN COM COP VCC VCC E AGND F VREF 5VA AC PD FOP TOP FOM TOM SL 5VA LD CGM CGP ELM ELP PVD ELVSNS GND 3 3 MOTOR PCB A MOTOR PCB B SIDE PCB D B C ...

Page 16: ... 3 4 MOTOR PCB A MOTOR PCB B SIDE PCB K DETECT PCB UNIT C E PCB UNIT B F PCB UNIT A G CXB3177 LOAD MOTOR PCB LOADING J PHOTO L PCB Q876 Q877 S866 MODE S868 LOAD S867 DOOR I FORDSW PCB CSN1052 CSN1052 CSN1052 A CN869 H FORD PCB F E G H I J K ...

Page 17: ...17 YPM MG2196ZF ...

Page 18: ... CD CORE UNIT Capacitor Connector P C Board Chip Part SIDE A SIDE B SIDE A NOTE FOR PCB DIAGRAMS 1 The parts mounted on this PCB include all necessary parts for several destination For further information for respective destinations be sure to check with the schematic dia gram 2 Viewpoint of PCB diagrams A B ...

Page 19: ...19 1 2 3 4 1 2 3 4 D C B A SIDE B E E E E E E E E 16 1 5 8 9 A CD CORE UNIT A YPM MG2196ZF ...

Page 20: ...20 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A CN801 PU UNIT A C D 4 2 SIDE PCB B SIDE PCB SIDE A B ...

Page 21: ...21 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A C MOTOR PCB A 4 3 MOTOR PCB A M M 7 1 Q1 ELV SENSE M1 CAM GEAR M3 ELV C B CN862 ...

Page 22: ...22 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A D 4 4 MOTOR PCB B SPINDLE MOTOR M5 MOTOR PCB B D ...

Page 23: ...23 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A D M M4 CARRIAGE 1 12 B CN864 ...

Page 24: ...24 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A S887 CLAMP 11 1 1 7 S886 ELV I CN869 H 4 5 PCB UNIT B PCB UNIT A PCB UNIT B E E D891 D892 1 2 H PCB UNIT A F F ...

Page 25: ...25 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A M M2 LOADING 1 1 4 2 I M 4 6 LOAD MOTOR PCB LOAD MOTOR PCB G H J G ...

Page 26: ...26 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A 4 7 FORD PCB K A CN802 E F G 1 4 1 7 5 1 2 1 4 FORD PCB H H SIDE A SIDE B FORD PCB H ...

Page 27: ...27 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A PHOTO L PCB J K G 1 2 Q876 Q877 4 8 PHOTO L PCB PCB UNIT C 4 1 D883 S885 MAX DETECT Q881 PCB UNIT C K H J ...

Page 28: ...28 YPM MG2196ZF 1 2 3 4 1 2 3 4 D C B A LOAD DOOR MODE E 4 9 FORDSW PCB I FORDSW PCB I SIDE A ...

Page 29: ...29 YPM MG2196ZF 5 6 7 8 5 6 7 8 D C B A I FORDSW PCB I SIDE B ...

Page 30: ...8S100J R 102 RS1 8S120J R 104 RS1 16S822J R 105 RS1 16S682J R 106 RS1 16S183J R 107 RS1 16S822J R 108 RS1 16S333J R 109 RS1 16S683J R 110 RS1 16S134J R 111 RS1 16S273J R 112 RS1 16S222J R 113 RS1 16S103J R 114 RS1 16S103J R 115 RS1 16S102J R 116 RS1 16S163J R 117 RS1 16S163J R 120 RS1 16S101J R 121 RS1 16S101J R 125 RS1 16S0R0J R 201 RS1 16S104J R 202 RS1 16S473J R 203 RS1 16S332J R 204 RS1 16S752...

Page 31: ... 760 RS1 16S102J R 801 RS1 10S102J CAPACITORS C 101 CEV101M6R3 C 102 CKSQYB104K25 C 103 CEV470M6R3 C 104 CKSQYB334K16 C 105 CCSRCH240J50 C 106 CKSRYB222K50 C 107 CEV4R7M35 C 108 CKSRYB273K25 C 109 CCSRCH101J50 C 110 CKSQYB104K25 C 111 CKSRYB332K50 C 112 CKSQYB473K16 C 113 CKSRYB103K25 C 114 CKSRYB391K50 C 115 CCSRCH121J50 C 116 CKSRYB682K50 C 117 CKSRYB333K16 C 118 CKSQYB334K16 C 119 CKSQYB334K16 ...

Page 32: ...er Unit Name PCB Unit B S 886 Spring Switch ELV CSN1052 S 887 Spring Switch CLAMP CSN1051 Unit Number Unit Name PCB Unit C Q 881 Photo transistor CPT231SXTD D 883 Chip LED CL202IRXTU S 885 Spring Switch MAX DETECT CSN1052 Unit Number Unit Name Load Motor PCB M 2 Motor Unit LOADING CXB3177 Unit Number Unit Name Motor PCB A Q 1 Photo Interrupter RPI 221 M 1 Motor Unit CAM GEAR CXB3174 M 3 Motor Unit...

Page 33: ...PN DISC3 DISC4 F CLS F OPN DISC5 DISC6 JMPOFF C T TRK F KICK TRK R KICK FF REV DISC COMP ON OFF SCAN REG ON RANDOM SHUFFLE SHIP POS TESTIN COMMANDER ADDRESS DATA LENGTH STATUS 1 STATUS 2 MODE BIT 1 MINUTE SECOND TRACK NO DISC NO BIT 2 BIT 3 LCD DISPLAY Commander indication data for CD mechanism module control KEY YPM MG2196ZF KEY Connection Diagram 6 ADJUSTMENT ...

Page 34: ...the innermost track 3 Press key DISC3 to close focus the display should read 91 Press key DISC2 to implement the tracking balance adjustment the display should now read 81 Press key DISC3 4 times The display will change returning to 81 on the fourth press 4 As shown in the diagram above monitor the LPF outputs using the oscilloscope and check that the phase differ ence is within 75 Refer to the ph...

Page 35: ...35 YPM MG2196ZF Grating waveform Ech Xch 20mV div AC Fch Ych 20mV div AC 45 0 75 60 30 90 ...

Page 36: ...lectric or mechanical shocks are not be given to the system This model employs a photo transistor for detecting discs at their loading or ejection Thus if its outer case is removed during repair work and internal parts are exposed to light of strong intensity malfunctions including the following can result The eject button becomes inoperable during play Pressing the eject button does not eject a d...

Page 37: ...86 Switching must take place in the following sequence 4 F AGC Gain T AGC Gain F BIAS Setting AGC Gain Current value Initial value x 20 Single TR 4TR 10TR 32TR 100TR Single TR 3 Switching must take place in the following sequence It applies to the CRG Move and 100TR Jump alone Min Sec or Track No 5 Switching must take place in the following sequence F Cancel Display 6 Switching must take place in ...

Page 38: ... Type of motors selected Lower order of 1 State of DISC sensing phototransistor and switch 1 CAM motor 2 ELV motor 3 LOAD motor 4 CAM LOAD motor PH1 PH2 MAXSW Display L H L H L H L H L L H H L L H H L L L L H H H H 0 1 2 3 4 5 6 7 L H Phototransistor is OPEN and switch is ON Phototransistor is CLOSE and switch is OFF SEC 1 When ELV motor is selected ELV position is displayed 01 ELV at home positio...

Page 39: ...indication sequentially changes through 32 33 23 22 When the disc to be ejected is not identical with the disc being clamped select the DISC2 T OPN ELVMOTOR in the vicinity of where the display changes from 22 to 20 then match the elevation to the disc to be ejected according to the following procedures After selecting ELVMOTOR lower the elevation until the ELV position display becomes 01 1st disc...

Page 40: ... second taking place None 11 Setup started None 12 Spindle rotation None Focus search started 13 Waiting for focus close XSL L Focus close not available 10 Waiting for focus close FOK H Improper focus close When AGC has not been conducted 14 15 Waiting for focus close FOK H Improper focus close When AGC has already been conducted 16 17 Focus CLOSE Off focus Tracking OPEN 18 T BAL adjustment Off fo...

Page 41: ...de are indicated on BIT 3 CD Operation Error Mechanism FD on MODE 02 on BIT 3 Details for the error code are indicated on MINUITE and SECOND 3 Error Code List Electric code Error Contents Details and Cause 80 C HOME NG Carriage home position CRG doesn t move to inner track CRG doesn t move from inner track NG Home switch NG CRG unmovable 40 LOCK NG Spindle lock NG Spindle doesn t lock Spindle NG f...

Page 42: ... 8 seconds have elapsed before completing the EJECT operation An error will be indicated if the disc is still caught by the phototransistor after 4 seconds of forced eject 55 HOME SW ON after forced EJECT HOME SW was still at ON position after 4 seconds of forced eject 57 Phototransistor being caught When forced eject was employed for the Bup failure during loading or after forced EJECT ejection a...

Page 43: ...N863 and CN864 4 Remove the Tray holder and the Tray assy See above 5 Rotate the Cam gear motor until the positions of all holes E match then stop the motor The Carriage Mech assy will stop as shown in the Fig 3 When the positions of all holes match they will be completely covered by the Carriage mech assy To rotate the Cam Gear motor see How to remove the Tray assy 6 Unhook the spring A 7 Remove ...

Page 44: ...by sliding it 4 Remove the feed screw pressure spring D 5 Loosen the 2 screws Remove the feed screw holder E 6 Remove the belt 7 Remove the Pickup unit together with the feed screw Be careful not to lose the shaft holders at the both ends of the feed screw Be careful not to damage the 2 flexible PCBs for the Pickup and motor when separating them The flexi ble PCBs have been stuck each other with d...

Page 45: ... the Cover from the Side PCB See Fig 3 Disconnect the flexible PCBs from the connectors CN863 and CN864 See Fig 3 2 Disconnect the the flexible PCB Motor PCB A from the connector CN862 on the Side PCB 3 Disconnect the flexible PCB from the connector CN861 to the CD core unit 4 Loosen the 2 screws A Remove the Side PCB 5 Loosen the screw B Remove the flexible PCB hold er 6 De solder at the 4 portio...

Page 46: ...PCB See Fig 3 Disconnect the flexible PCBs from the connectors CN863 and CN864 See Fig 3 Disconnect the the flexible PCB Motor PCB A from the connector CN862 on the Side PCB See Fig 9 Loosen the 2 screws A Remove the Side PCB 2 Unhook the spring Remove the Door open lever 3 Loosen the 3 screws Remove the Photo L PCB PCB unit C and the frame 4 Remove the spring A Gear cover Motor bracket assy Front...

Page 47: ... Remove the Side PCB See Fig 9 Remove the Motor PCB A See Fig 9 Remove the Gear cover Fig 10 2 Unhook the Spring C Remove the Door open lever 3 Loosen the screws D E and F Remove the PCB C and D and the frame 4 Unhook the springs A and B 5 Pull out the Load arm assy right upward 6 Unhook the spring G Remove the belt large 7 Loosen the screw H Remove the Load arm assy Ford PCB Loading motor Loading...

Page 48: ... Remove the Mech lock junction lever and roller D Pay attention to the mounting direction 14 Remove the 2 E type washers A and 2 washers B 15 Remove the Elevation lever right 16 Remove the 2 rollers C Pay attention to the mounting direction 17 Remove the Mech lock lever right 18 Lift up the Stage mech assy to remove it Motor bracket assy Photo interrupter Front Mech lock junction lever Elevation l...

Page 49: ...l output 28 XIN I Crystal oscillating element connection pin 29 XOUT O Crystal oscillating element connection pin 30 VSS GND 31 37 NC3 9 O Key strobe output 38 CSEL I COMP select input 39 TESTIN I Test program mode input 40 DCLOSE I Door close sense input 41 WDSL O Data comparison designation output 42 XWIH I DRAM data white inhibit input 43 XEMP I DRAM data read inhibit input 44 CHDT I Data compa...

Page 50: ...ing monitor input 75 EREF I DRAM A D converter reference voltage input 76 77 PH1 2 I Disc photo sense input 78 MAXSW I MAX switch input 79 ELVSNS I ELV position sense input 80 TEMP I Temperature detector input 80 1 20 21 40 41 60 61 PD5467B IC s marked by are MOS type Be careful in handling them because they are very liable to be damaged by electrostatic induction ...

Page 51: ...ft Level shift Level shift BA5986FM MSM514400DP 60TS 26 25 24 22 VSS DQ4 DQ3 oe 23 cas 18 17 16 14 A8 A7 A6 A4 15 A5 1 2 3 5 4 9 10 11 13 12 DQ1 DQ2 we A9 ras A0 A1 A2 VCC A3 Timing Generator Column Address Buffers Timing Generator Column Decoders Write Clock Generator Internal Address Counter Refresh Control Clock Sense Amplifiers I O Selector Output Buffers Input Buffers Row Address Buffers Row ...

Page 52: ...DCK WDCI LRCI 31 32 BCKI DATI 48 47 46 45 XOE XCAS D3 D2 44 43 42 41 D0 MCSL C176 VSS 40 39 XTLI D1 38 37 36 35 XTLO OSCE NC MCK 34 33 RFCK XROI 64 63 62 61 XEMP XWIH NC A4 60 59 58 57 A6 A7 A8 VDD 56 55 A3 A5 54 53 52 51 A2 A1 A0 A9 50 49 XWE XRAS Timing controller CPU interface VWA register CK generator WA generator RA generator Remain area calcurator S P P S Status controller Data comparator RA...

Page 53: ...8 27 26 25 24 23 22 21 20 X12 RF envelope AGC Detection X3 Phase detection 3T detection Bottom DC shift Peak Control DC shift Bottom Peak 120kΩ DEFECT circuit FE BAL FE BAL Vcc Mirror circuit FE BAL APC X2 Vcc FE BAL TE BAL ASY EFM OUT C DEF DEFECT RFOK MIRR 3T OUT C FE FE OUT FE GND TE TE OUT1 TE OUT2 DET IN DET OUT VREF IN VREF OUT LDON LD PD E F D B C A Vcc C2 3T C1 3T RF RF OUT RF IN C AGC AGC...

Page 54: ...tput from Pin 35 As signal level amplification is 2 5 Vp p around REFOUT 4 DFCT defect circuit DFCT signal detects mirror defect in discs and is output from Pin 33 The system outputs H when a mirror defect is detected If disc is soiled the system determines it as lack of mir ror Therefore the system inputs the DFCT signal out put to the HOLD terminal of servo LSI Focus and track ing servo drives c...

Page 55: ...tecting the zero cross point are as follows 1 To be used for counting tracks for carriage move and track jump 2 To be used for detecting the direction of lens move ment when tracking is closed To be used in the tracking brake circuit mentioned later The frequency range of TEC signal is from 500 Hz to 19 5 kHz Voltage TEC TE level x 4 In other words the TEC signal level is calculated as 6 Vp p This...

Page 56: ...luctuation signal from Pin 30 The resulting signal is obtained through L P F with a fc of 40 Hz This signal is used for automatic adjustment of FE bias MIRR COMP DC shift Peak AGC Bottom RFO Detection A 1 5V UPC2572GS Peak Bottom 4 31 RFIN B Z C RFO PEAK HOLD BOTTOM HOLD MIRROR 1 A 0 False MIRR caused by dirt True MIRR OFF TRACK Dirt etc B C Z Ø 3T OUT FE signal RFIN UPC2572GS C113 10nF FEY 3T det...

Page 57: ...iage and spindle are amplified in IC301 and BA5986FM and supplied to respective actuators and motors 1 Focus servo system The main equalizer of focus servo is located in the UPD63702AGF Fig 9 shows block diagram of the focus servo For the focus servo system the lens must be posi tioned within the focusing range in order to perform focus closing To achieve this the system moves the lens upward down...

Page 58: ...o focus closing The illustration shows when the system cannot perform focus closing S curve search voltage and actual lens behavior can be checked by pressing the Focus Close button when 01 is shown in Focus Mode Select in Test mode REFOUT FD LENS POSITION RELATIVE TO DISC NEAR FAR JUST FOCUSED SIN REFOUT Expanding around Just Focused Point REFOUT RFI FOK FEX FZD THRESHOLD LEVEL FZD INTERNAL SIGNA...

Page 59: ...the point of time when the set number is counted and stops the lens Thus track ing is closed and the system can continue normal play back To improve servo withdrawal during track jump the system sets the brake circuit to ON for 60 ms after brake pulse so that gain of the tracking servo can be increased FF REV in normal mode is made by continuously per forming single jump approximately ten times fa...

Page 60: ...lays the speed of the lens movement to stabilize withdrawal of the tracking servo The system judges sliding direction of track from TEC and MIRR signals as well as the relationship of their phase TEC TZC TEC SQUARED UP INTERNAL SIGNAL MIRR MIRR LATCHED AT TZC EDGES SWITCHING PULSE EQUALIZER OUTPUT SWITCHED DRIVE DIRECTION Note In the illustration the phase of equalizer output is shown as the same ...

Page 61: ...hold level is set for equalizer output in the servo LSI and drive voltage is output from the servo LSI only when the equalizer out put level exceeds that level Thus power consumption is reduced Depending on eccentricity etc of disc the equalizer output voltage may cross the threshold level several times before the pickup unit as a whole starts operation At this time waveforms of drive voltage from...

Page 62: ...ronous status 4 Brake mode Mode to stop the spindle motor The microcomputer outputs brake voltage from the servo LSI Waveforms of EFM are monitored inside the LSI If the longest pattern of EFM exceeds speci fied intervals if the rotation speed adequately slowed down flag is activated in the LSI and the microcomputer turns brake voltage to OFF If no flag is activated after a specified time the micr...

Page 63: ... name TBAL of the servo LSI 4 The voltage output from the servo LSI is input to Pin 37 of the preamplifier IC101 UPC2572GS Pin 37 is a control voltage terminal of the TEVCA amplifier According to voltage input the system changes gain of Ech and Fch in the preamplifier and adjusts the tracking balance to make the upper and lower por tions of TE waveforms symmetric to REFOUT 4 FE bias automatic adju...

Page 64: ... can be displayed in Test mode for confirmation Display of coefficients in each automatic adjustment is as follows 1 FZD cancel TE OFST cancel T BAL and FE bias Reference 32 32 No adjustment was required Display is made in units of approximately 40 mV Example Coefficient of FZD cancel 35 35 32 3 3 x 40 mV 120 mV Corrected amount is approximately 120 mV Thus FE offset before adjustment is 120 mV 2 ...

Page 65: ...DP 60TS and reads and outputs the data at normal speed in synchronization with the internally generated FS system clock In order to write the DA data at double speed and to read out at normal speed the DRAM becomes full but when it reaches capacity it will tenta tively stop reading data The CD is in the pause mode during this time When an available area is created by data read out from the DRAM da...

Page 66: ... tray position d The Cam gear rotates counterclockwise to move the LOAD arms as shown in Fig 21 e The LOAD arms push the disc loaded on the tray and open the tray hooks f When a disc is inserted the disc interrupts the infrared LED light from the photo transistors and the Rubber roller starts rotating The photo transistors are connected in serial When the light is interrupted from either photo tra...

Page 67: ...ter 2 Elevation a The Cam gear rotates to the elevation OK position b The ELV motor rotates to slide the elevation lever via the gears c The 2 elevation levers left and right can synchronize their sliding via the joint arm d The shafts of the Stage Mech Assy engage with the stair like grooves in the elevation levers and the verti cal holes in the Main chassis via the rollers e When the elevation l...

Page 68: ...Clamp switch is turned ON Clamp UP lever Clamp arm Clamp UP roller Carriage Mech Assy Carriage drive shaft Carriage drive arm Clamp switch Fig 24 5 Disc Sense Initializing a The disc sense operation is to detect if or not a disc is loaded on the trays 1 to 6 b While a disc is inserted using the robber rollers the disc pushes the insertion completion switch via the arm to sense that a disc is loade...

Page 69: ...ion as indi cated by the arrow in Fig 25 to push the mechanism forward and downward d The Mech lock lever left is driven by the movement of the Mech lock lever via the Mech lock junction lever to push the Mechanism downward e The mechanism lock is released only in the disc clamp mode Mech lock lever Mech lock lever left Mech lock junction lever Mech lock lever right Fig 25 Door switch Door lever C...

Page 70: ...f the Stage lock lever right are pressed against the gear like portions of the chassis to lock the right side of the Stage mech assy d For the left side of the Stage mech assy in the mode described at the step d on 3 7 Mechanism lock the Mech lock junction lever is driven to move the Stage lock lever left e The 2 bent portions of the Stage lock lever left are pressed against the gear like portions...

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