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Pioneer CX-3283 Service Manual Download Page 18

18

CX-3283

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A

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C

D

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F

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2.3  DISC CENTERING MECHANISM

1. The 12cm disc passes under the Guide Pin and the Centering Pin, and is centered at the back position of mechanism.

Guide Pin

Centering Pin

12cm disc

Centering Pin

Guide Pin

Guide Pin

http://www.Datasheet4U.com

Summary of Contents for CX-3283

Page 1: ...rvice manual DVD Mechanism Module AVH 2400BT XUEW5 AVH 2400BT XUUW5 AVH 1400DVD XUEW5 CRT4836 CXK8003 AVH 1400DVD XUUW5 AVH P1400DVD XUUC AVH 1450DVD XMRC AVH 1450DVD XURD CRT4837 CXK8003 AVH 1450DVD XMRI AVH 1490DVD XMID AVH P3400BH XUUC AVH P2400BT XUUC AVH 2450BT XMRC CRT4838 CXK8003 AVH 2450BT XURD AVH 2450BT XMRI AVH 2490BT XMID AVH 3400DVD XUEW5 AVH P3400DVD XUUW5 AVH P3450DVD XURC CRT4839 C...

Page 2: ...rcuit Inline circuit Variable Gain Amplifier VGA circuit 4 Laser Power Control LPC circuit 5 A D converter for SERVO 10 bit DPD system comparator PWM 1 1 1 APC Circuit The optical output of a Laser Diode LD has large negative temperature characteristics Therefore driving LD with constant current will not get you constant optical output The APC circuit controls the current so that the output will b...

Page 3: ... Circuit For the SPDL motor for the DVD mechanism module a brush motor which is used for the CD mechanism module is adopted instead of a brushless motor which is used for the conventional DVD mechanism module The SPDL circuit to drive the brush motor is as shown below IC1501 MN2DS0018MA 66 MD 26 OPIN3 25 OPOUT3 16 VO3 15 VO3 MOTOR IC1251 MN2DS0018MA LSI MN2DS0018MA LSI 1 1 3 FE Generating Circuit ...

Page 4: ...F 11 3M 5 7M Hz LPF 11 3M 5 7M Hz 0 1uF 0 1uF 0 1uF 0 1uF HPF HPF 1MHz 2 5MHz through Phase comparator LPF integrator D TE signal generating circuit TE AMP MN2DS0018MA LSI DAC CMP Binary comparator DAC CMP CMP CMP DAC DAC DAC control filter DAC control filter DAC control filter DAC control filter Phase comparator HPF 1MHz 2 5MHz through HPF 1MHz 2 5MHz through HPF 1MHz 2 5MHz through 100 97 F H_G ...

Page 5: ...n 2 Tracking pulling in Process the tracking drive hold with an OFTR signal 3 Pulling in check Check that track jump is less than the specified number within the specified period The pulling in check will time out in 8 4 msec and be retried upon receiving a command from the microprocessor AS RFENV Close to Disc Lens Away from Disc Focusing Point FE FODRV VHALF 1 Measurement and optimization of a s...

Page 6: ...d number of track count It also drives the CRG motor according to the number of jump 3 Traverse Seek By counting the track according to the Track Cross Signal TKC and measuring the time of TKC it controls the movement speed and performs the seek operation At the same time it minimizes the vibration in the pick up that will occur during movement Here is the common jump switching setting between DVD...

Page 7: ... Traverse Seek by 1001 track for DVD Traverse Seek by 10000 track for DVD COP COM TD TE COP COM TD TE TE TD Interval Jump by 1 track for DVD Outward Jump TE TD Inward Jump Outward Jump Inward Jump Outward Jump Inward Jump Outward Jump Inward Jump http www Datasheet4U com ...

Page 8: ... Deceleration End Level If the deceleration time out time is reached before detecting the Deceleration End Level however it will forcibly end the deceleration Here are the waveforms of Focus Jump Waveforms of Focus Jump Objective Lens The system automates all kinds of circuit adjustment The section describes how each automatic adjustment works 1 3 1 Offset Cancel of VIN7 VIN8 VIN9 and VIN10 Each s...

Page 9: ...S Normalization Adjustment The function is to fine tune the AS signal level so that it will be 64 LSB at the digital equalizer input stage after measuring the AS signal level by the specified number of sampling and A D converting it at ADSC during Tracking Close All the automatic adjustment results can be checked on the display in a test mode List of Automatic Adjustment Coefficients Caution All c...

Page 10: ... PCM1753DBQ 3 3 Reg VCC33 3 3 V 0 033 V IC1004 NJM2885DL1 33 1 2 DC DC VCC12 1 2 V 0 015 V IC1953 S 1135D12 A6 DVD1chip 3 3 V SDRAM IC1480 M12L64164A 5TG2M Flash ROM 1 Program IC1402 S99 50243D K Other DVD1chip 1 2 V VD8V HOST Power Supply mechanism inside Power Supply Pick Up Unit CGY5100 1chip Driver IC1251 BA5839FP DVD LSI IC1501 MN2DS0018MA Supply IC Flash ROM 2 Data IC1401 S99 50243D K USB Ci...

Page 11: ...1512 10 pF 156pin 155pin OSCO OSCI IC1501 DVD LSI MN2DS0018MA IC1801 Audio DAC PCM1753DBQ DACCLK 33 868 8 MHz or 36 864 MHz 220 ohm R1508 1200 ohm R1952 C1951 10 pF 1 Mohm 820 ohm X1950 CSS1760 48 MHz R1953 C1952 10 pF 50pin USB_Clock IC1501 DVD LSI MN2DS0018MA IC1951 TC7SZU04 2pin IN_A 4pin OUT_Y FU Outline of USB_Clock By connecting a 48 MHz crystal oscillator with DVD LSI IC1501 it generates an...

Page 12: ...ST IF connector CN1952 Analog Audio Signal Digital Audio Signal Zo 820 ohm AVCC5 Radio audio circuit 14 pin Lch Audio GND LS2 Mechanism module Audio DAC PCM1753 16 pin Rch 13 15 17 pin Audio GND fc 88 kHz MUTE Circuit AMUTE 23 pin 47 kohm or more 47 kohm or more IC1801 820 ohm R1804 C1804 R1803 C1803 C1802 C1801 4 7 uF 4 7 uF R1802 R1801 100 kohm 100 kohm CN1952 6 pin IECOUT CN1952 120 ohm 820 ohm...

Page 13: ...SDRAM Clock input for data input from SDRAM Outline This is the memory for implementing the AV decoding function of DVD LSI IC1501 It can be used in various ways from buffering the stream data before decoding and serving as a work area during decoding to storing the AV and output data after decoding SDRAM Design Data bus range 16 bit Operating frequency 121 5 MHz CAS latency 3 8 word burst forward...

Page 14: ... DVD LSI DV5 VCC33 CN1952 IC1501 R 1955 144pin LOUT 146pin ROUT R 1954 R1951 R1950 R1543 3 pin SDA R1544 2 pin RESET R1532 R 1527 R 1546 VCC33 VCC33 R 1535 VCC33 47pin I2C_SCL 46pin I2C_SDA 61pin CP_Reset LS2 Mechanism module 6 8 kohm 100 kohm 24 ohm 15 kohm 24 ohm 15 kohm 180 ohm 180 ohm 100 ohm 6 8 kohm 9 pin D 8 pin D 10 pin DGND 4 pin SCL D1901 RKZ6 8TKJ D1902 RKZ6 8TKJ http www Datasheet4U co...

Page 15: ...odel for AVN AVH One of four types of the upper case is shown below as an example The structure is as same as that of the model for DVH Load Carriage Motor mechanism module Upper Chassis Upper Case Rear Bracket Damper PU Unit DVD Core Unit Spindle Motor Front Bracket http www Datasheet4U com ...

Page 16: ...83 1 2 3 4 A B C D E F 1 2 3 4 The structure of the CRG mechanism is common regardless of the type of the Upper Case CRG mechanism Clamp Arm ASSY Roller Arm ASSY SW Arm Disc Guide ASSY http www Datasheet4U com ...

Page 17: ...s from OFF to ON When SW1 switched from OFF to ON the Load Carriage Motor starts and the Rubber Roller rotates 2 In the case of 12cm disc as SW Arm spreads widely SW1 switches from ON to OFF and the microcomputer judges that it is 12cm disc Rubber Roller Load Carriage Motor PU Unit SW Arm R DISC SW1 http www Datasheet4U com ...

Page 18: ...4 2 3 DISC CENTERING MECHANISM 1 The 12cm disc passes under the Guide Pin and the Centering Pin and is centered at the back position of mechanism Guide Pin Centering Pin 12cm disc Centering Pin Guide Pin Guide Pin http www Datasheet4U com ...

Page 19: ... when the Roller Arm turns the upper and bottom mechanism locks are released and clamp operation is completed 4 When the clamp operation is competed the control by the Cam on the Drive Lever is removed and the Switch Lock Arm turns When the Arm turns the Switch Idle Gear moves away from the Rack Drive Gear engages with the Feed Screw Drive Gear and the carriage operation starts 3 2 5 1 4 Jumping R...

Page 20: ... 1 When the Load Carriage Motor reverses and the Pick Up moves SW2 to the inner circumference beyond ON the eject operation stars in the inverse process of the above description 2 Eject completion of 12cm disc SW1 ON OFF ON OFF ON SW1 http www Datasheet4U com ...

Page 21: ...AVN AVH 1 Hold the designated parts within the dashed line of Upper Chassis and Front and Rear Bracket 2 Do not hold the areas within the solid line or the CRG mechanism Section or insert a foreign object Doing so may cause deformation Handling NG Handling OK http www Datasheet4U com ...

Page 22: ...nd Front and Rear Bracket 2 Do not hold the areas within the solid line or the CRG mechanism Section or insert a foreign object Doing so may cause deformation 3 Holding the lateral face of Upper Chassis may result in deformation So do not apply excessive force approximately 8 newtons and under Handling NG Handling OK http www Datasheet4U com ...

Page 23: ...D The mechanism is clamped and the PU moves to the outer circumference Note Do not apply the current when soldering of the CRG Motor Lead Wire is not removed IC and the PU may be damaged 3 Stop the motor when the PU reaches the intermediate circumference Note If the PU moves to the outermost circumference tooth jumping occurs There is no problem but prevent tooth jumping as much as possible Fig 1 ...

Page 24: ...Y up to the status of Fig 2 b Open lock status 4 Put a finger on A part of Fig 2 c and slide it in the direction of arrow Direction of play state 5 Push the Clamp Arm down Note When the CRG mechanism is returned to eject status install the Drive Gear after it is put to eject status by sliding the Drive Lever to prevent tooth break of the pinion of Drive Gear in the installation Joint Washer Drive ...

Page 25: ...e CRG Motor Lead Wire to make it eject status white wire 4V green wire GND 2 Hold the DVD CORE UNIT as shown in Fig 5 Be careful not to touch the SW Knob 3 Insert the DVD CORE UNIT into A hook and B hook simultaneously Fig 5 4 Push the DVD CORE UNIT down lightly and set it to the positioning dowel 5 Fix the DVD CORE UNIT with a screw while supporting C part with a finger as shown in the Fig 6 6 So...

Page 26: ...d the white wire one time Fig 2 3 Twist the red and black wires two and half turns Fig 3 4 Make sure that the wound red and black lead wires are located in the positions shown in Fig 4 and Fig 5 Fig 2 Fig 1 Fig 4 Upper limit Fig 6 Lower limit Fig 3 The tips red line and black line should be below the CORE UNIT surface The tips of wires should be above the top surface of Chassis They must not conta...

Page 27: ...de the bend Fig 3 Check that the Damper Shaft is located within the Centering Spring Fig 4 When assembling the CRG Mechanism create an empty clamp state according to 3 3 HOW TO CREATE EMPTY CLAMP STATUS MECHANISM MODULE MOTOR DRIVEN and press down the upper part of the Damper of the CRG Mechanism so that the Damper and the CRG Mechanism are firmly in engagement with each other Fig 5 Fixing Screw o...

Page 28: ...oller Transmission Side Gear Fig 2 Fig 1 Fixing Screw of Guide Bracket Disc Guide ASSY How to remove the Roller Transmission Side Gear 1 According to 3 10 HOW TO REMOVE THE CRG MECHANISM ASSY remove the CRG Mechanism ASSY Mechanism Eject status 2 Remove the Biasing Spring of Roller ASSY Fig 3 3 According to the items after Item 2 of 3 11 HOW TO REMOVE THE DISC GUIDE ASSY remove the Disc Guide ASSY...

Page 29: ...tly pushing A part 6 Remove the Left Biasing Spring of Clamp Arm 7 Furthermore hold the Clamp Arm ASSY up to 45 60 and slide to the left then it to remove Fig 1 How to install 1 Slide the Clamp Arm ASSY from the left and install to the support with it tipped 45 60 2 Tip the Clamp Arm ASSY to the position of Fig 3 position where it stops by contacting with the Chassis 3 Install the Left Biasing Spr...

Page 30: ...ke sure to install the Biasing Spring of Switch Idle Arm Do not reuse the Joint Washer of Drive Gear and Idle Arm due to snap fit structure When the CRG Motor is installed move to the center of mechanism to completely engage the gear a Align the support hole of Worm Wheel with the plate hole b Engage the Idle Gear with the Worm Wheel c Adjust the positioning while checking the external form of pla...

Page 31: ...arrow 1 first install B part Fig 2 install C part of the Drive Lever Fig 4 in the groove of Chassis side bend and finally install D part Fig 4 in the L shaped groove of Chassis And then slide the Drive Lever to the state of Fig 1 1 If A part Fig 3 is not moved sufficiently the Drive Lever cannot be engaged suitably In this case the Idle Gear may be on the position of red broken line Fig 5 so move ...

Page 32: ... remove it Return Spring of SW Arm Fig 1 Fig 2 Expand the Right SW Arm until it contacts this point Expand the Right SW Arm 1 According to 3 10 HOW TO REMOVE THE CRG MECHANISM ASSY remove the CRG Mechanism 2 Insert the flathead screwdriver under A part of plate which is joined with the Damper raise the plate and release the clinch 3 Similarly insert the flathead screwdriver under C part raise the ...

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