Pioneer CX-683 Service Manual Download Page 11

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CX-683

VD system

8.3V

ADD system

3.3V

REG.

UPC2933T

BA5985FM

RF·Amp

MD·DSP

PU/ACT

CRG/SPDL
MOT

MD micro-
computer

LogicBuffer
/mute

Load/EJ
MOT

* typ40mA

CXA2523AR

CXD2655BR

PD5541B

TC7WH125FU*2

SlaveP-Bus

DRAM

MSM51V4400DP-70TK

MDVD
system

PVD system

DRIVER

8.3

0.5V

VDsense
High : 9.9V
Low : 3.5V

Software protecting operation

* 5V drive during plays is also available

TEMP sense
+82 to 87

R314 :

10k

9.1k

8.66k

Thermistor 82

Output voltage 3.3

0.16V

1.3A with built-in excess
current protector

Software protecting operation

1.4 SCHEMATIC FLOW DIAGRAM FOR THE MODULE POWER

(TEMPERATURE DETECTION)

Summary of Contents for CX-683

Page 1: ...AN 2000 Printed in Japan ORDER NO CRT2441 MD MECHANISM MODULE CX 683 Service Manual NOTE This Service Manual describes the operations of the MD mechanism module being used for the models listed in the Table indicated below Be sure to reference this service manual as well as the service manual prepared for respective models must be referenced before implementing the repair work CONTENTS 1 CIRCUIT D...

Page 2: ...he RF amplifier to become FE TE and ADIP signals Also I and J outputs which have been I V converted by the amplifier incorporating the photo detector inside the pickup are processed to become the RF signals and the PEAK and BOTM signals Meanwhile since this system is of the single power 3 3V specification the reference voltage for the servo signals is Vc 1 65V Vc is being output from this RF ampli...

Page 3: ...he data processing as well as control of the Premastered Disc playing spindle 1 APC Automatic Power Control Circuit Since laser diode LD has temperature characteristics the APC circuit is provided to control current flow using the monitor diode so that the output may be kept at a constant level LD current is determined by measuring voltage across V1 and 3VD The current value should be approximatel...

Page 4: ... is also used for generating FOK and defect detect signals The ADIP amplifier is used for generating ADIP signal that is present only on the Recordable Disc Addresses are already recorded on the Recordable Disc by wobbling FM signal that uses 22 05 KHz as the carrier In order to detect wobble elements noise elements of the signal are eliminated on the BPF then the signal is output to the ADFM via ...

Page 5: ...ically adjusts an EF balance resistance value so that level of SE signal becomes the same as the reference voltage Vc when the TRKG made is open The SE amplifier generates TE signal from the LPF then enters it into the signal processing LSI IC201 73 pins for digital equalizing Condition PTGR HLPT PremasterdDisc Pit High reflection 1 2 RecordableDisc Pit Low reflection 1 1 Groove Low reflection 2 1...

Page 6: ...the focus the actuator is driven up near to the Disc once then moved down As soon as up move is started the spindle is kicked for 252 ms then ofst drive is turned on Focus close is carried out when the following conditions are met 1 The actuator after having approached the Disc once is now moving away from it 2 FOK H Can be monitored on the mnt0 terminal when the mnt selector is set to 00 3 FZC Af...

Page 7: ...nitoring control signal TOP TOM E F RF amplifier Driver Pick up IC201 IC101 IC401 OFST EQ PWM TFDR 86pin TRDR 85pin A D SE CIN For monitoring control signal COP COM E F RF amplifier Driver Carriage Motor Pick up IC201 IC101 IC401 OFST EQ Move PWM SFDR 92pin SRDR 91pin M Timing Control Timing Control RF ADFG SIN For monitoring control signal SOP SOM RF amplifier Driver Spindle Motor Pick up IC201 I...

Page 8: ...atically carried out when the IC sends the command to the RF amplifier in response to the instruction from the microcomputer 3 Tracking balance EF B adjustment In this adjustment gain of E signal on the RF amplifier is varied so that TE signal may become evenly balanced against VC reference voltage 67 pin in terms of both plus and minus This adjustment is automatically carried out when the IC send...

Page 9: ...l is varied by 0 75dB against F signal 4 AGC adjustment Reference 30 h Variable gain volume can be computed based on difference from the reference Example 27 FACC 20log 27 h 30 h 1 8dB Variable gain volume is 1 8dB The same applies to the tracking too 5 Focus bias adjustment Reference 00 h Variable bias volume can be computed based on difference from the reference Example FA BIAS FA h 100 h 6 Volu...

Page 10: ...ed on the product 2 Driver block It is a linear driver used for driving 5 channels consisted of 1 channel on Load EJ system and 4 channels on actuator SPDL CRG system Forward reverse drive approximately 7 5V of the Load EJ system is implemented by the control signals MLOAD AND MEJCT from the MD microcomputer 4 channel system conducts binary PWM signal to the differential L P F then supplies it dri...

Page 11: ...veP Bus DRAM MSM51V4400DP 70TK MDVD system PVD system DRIVER 8 3 0 5V VDsense High 9 9V Low 3 5V Software protecting operation 5V drive during plays is also available TEMP sense 82 to 87 C R314 10k 9 1k 8 66k Thermistor 82 C 85 C 87 C Output voltage 3 3 0 16V 1 3A with built in excess current protector Software protecting operation 1 4 SCHEMATIC FLOW DIAGRAM FOR THE MODULE POWER TEMPERATURE DETECT...

Page 12: ...iven rubber roller and as the result transfer of the cartridge is initiated A view from the insertion port Load switch Normally off It is turned on only when the cartridge is inserted A view from the insertion port when the cartridge is inserted Arm It starts rotating when the cartridge is inserted An internal view of the machine When the cartridge is inserted Loading motor Rubber roller Eject swi...

Page 13: ... thereby moving the sheet metal lever fitted to the resin gear When the sheet metal lever is moved the cartridge holder fitted to the groove on the sheet metal lever is driven to the clamping position Cartridge being transferred Resin lever being pushed by transferring force of the rubber roller Cartridge starts pushing the resin lever Sheet metal lever Resin lever spur gear after engagement Resin...

Page 14: ...s ejected basically in the reverse order of loading Eject position is decided by the eject switch As this switch is turned off the loading motor is stopped and thus the cartridge eject operation is completed Left side sheet metal lever Shutter is opened or closed by the shutter spring that is screw fixed to the cartridge holder Right side sheet metal lever Arm for synchronizing the move of the lef...

Page 15: ...gs 4 Drive out the PU Unit through the direction indicated by the white arrow head Carriage Motor and Spindle Motor Removing the Loading Motor 1 2 1 Provide short solder in section A then remove the connector 2 Peel off solder in section B then remove the lead wire 3 Remove the two screws then dismount the MD Unit 4 Remove the connector situated in section C Note Before removing the Loading Motor ...

Page 16: ... along the outer perimeter Removing the Loading Motor 2 2 1 Peel off solder in the circled position then remove the Flexible PCB 2 Remove the four screws then dismount the Bracket 3 Remove the two screws then dismount the Motor Bracket 4 Remove the two screws then dismount the Loading Motor When replacement of the Loading Motor is complete apply 7V to the new Loading Motor with the chassis being a...

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Pioneer CX-683, Service Manual

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