Pioneer CX-3150 Service manual

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PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan

PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A. PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936

PIONEER CORPORATION 2005

ORDER NO.

CRT3495

DVD MECHANISM MODULE(MG4)

CX-3150

This service manual describes the operation of the DVD mechanism module incorporated in models

listed in the table below.

When performing repairs use this manual together with the speciﬁc manual for model under repair.

Model Service Manual DVD Mechanism Module

FX-MG9857DVZT/UC FX-MG9857DVZT-91/UC FX-MG9857DVZT/EW FX-MG9857DVZT-91/EW FX-MG9757DVZT/EW FX-MG9757DVZT-91/EW FX-MG9757DVZT/AU FX-MG9757DVZT-91/AU

CRT3494 CXK7402

CONTENTS

1. CIRCUIT DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . 2

2. MECHANISM OVER VIEW . . . . . . . . . . . . . . . . . . . . . . 19

3. DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4. HOW TO ASSEMBLE . . . . . . . . . . . . . . . . . . . . . . . . . . 37

K-ZZU. JULY 2005 Printed in Japan

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1. CIRCUIT DESCRIPTIONS

MN35103UB and MN35104UB are 1-chip LSI for DVD-Player. The connection of this LSI to the Driver IC, SDRAM, Flash-ROM, Audio-DAC, etc. can configure the DVD-Player System. This LSI contains Front End (SODC/FE) that performs RF signal /Servo /Decode processings, Back End (AV decoder/BE) that performs the video decode processing such as MPEG1/MPEG2/JPEG and audio decode processing such as DVD-Audio/AC-3/DTS/MP3, and the system controller (Siscon) for controlling the system. Front End part realizes the arithmetic processing of optical head signal and RF signal processing, the digital signal processing for DVD-ROM reproduction that conforms to DVD standards (16-8 Demodulation, Error correction), the digital signal processing for CD-DA/CD-ROM (Error correction), AV decoder transmission, servo control, spindle motor control and seek control. Please take note that, since (FEP) and (SODC) with DVD mecha-module (MS3) of CX-3016 are integrated into one chip at MN35103UB and MN35104UB, the waveforms of servo system on the front end which had previously appeared at MS3, i.e., the waveforms of FE, TE and AS, cannot be seen anymore.

1.1 Analog Block (MN35103UB, MN35104UB:IC1501)

1 Front End Part (MN35103UB, MN35104UB:IC1501)

The analog block for IC1501 generates the servo signals including focus and tracking, processes addition of RF signals, and controls the laser power of pickup. The servo system contains focus operation amp, focus offset adjustment circuit, 3-beam tracking operation amp, phase difference tracking detection circuit, tracking offset adjustment circuit, TE2 value-making circuit. Also, RF signal processing system contains the functions of AGC and equalizer.

1.1.1 APC Circuit

The optical output for the laser diode (LD) has large minus temperature characteristics. Therefore, the constant

optical output cannot be obtained when LD is driven by the constant current. APC circuit controls the electric current so as to provide constant output at the monitor diode (MD). MN35103UB and MN35104UB contain two types of APC circuits, one for DVD and another for CD. The LD electric current for DVD (CD) can be obtained by dividing the voltage measurements between DVDLD1 (CDLD1) and 5V by 15.6 (3.9 4=15.6 ). For DVD (CD), the results are approx. 26mA (44mA).

+5V

–

LDONCD

LDPOWER

Reg.

LDONDVD

0.17V

–

0.25V0.18V

–

LPCO2

LPC2

+5V

LPCO1

LPC1

0.59V 0.18V

0.5V

0.25V

0.22V

3.9Ω 3.9Ω 3.9Ω 3.9Ω

CDLD1

CDLD0

DVDLD1

DVDLD0

CN1101

78LD

78MD

65LD

65MD

CDLDDVD

PU unit

+5V

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1.1.2 FE Generation Circuit

Focus Error (FE) Generation Circuit

Each of input signals from B1 to B4 which had been quartered by PU within the analog block is input to IC 1501 passing through the resistance and becomes a signal of FE offset adjustment value. Then, the signal is AD-converted within the servo block and adds an offset cancel value to become FE, generating a signal of FE=(FE+)

CN1101

VIN5

VIN6

VIN7

VIN8

–

OFFSET ADJ

–

OFFSET ADJ

(FE-).

Analog block

–

x1 or x4

–

(B1+B3) and FE

1+(Pfbal/0x10000)

Pfepofs

1-(Pfbal/0x10000)

Pfenofs

Servo block

-=-

(B2+B4) after adding a focus

–

Dfesv

1.1.3 TE Generation Circuit

Trackings Error (TE) Generation Circuit

For DVD, TE is generated, with the application of a phase contrast method, from the phase difference of (B2+B4) and (B1+B3). For CD, TE is generated, with the application of a 3-beam method, by sending the signal to the variable amp set for the tracking offset adjustment via outer-attached resistance and then by AD-converting it to

–

VHALF

–

Analog block

6dB 15dB(3dB STEP)

0dB/12dB

–

OFFSET DAC

6dB 15dB(3dB STEP)

0dB/12dB

–

OFFSET DAC

Analog block

OFFSET ADJ

30kHz

–

x1 or x4

–

1+(Pfbal/0x10000)

Servo block

Pfepofs

1-(Pfbal/0x10000)

Pfenofs

1+(Pfbal/0x10000)

Pfepofs

1-(Pfbal/0x10000)

Pfenofs

–

Dfesv

Servo block

–

Dfesv

make the formula of TE=A

DVD (TE from phase difference)

CN1101

VIN1

VIN2

VIN3

VIN4

CD (3-beam TE)

CN1101

VIN9

20kΩ

VREFH

VIN10

VREFH

20kΩ

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1.2 Servo Block (MN35103UB, MN35104UB:IC1501)

Servo block performs focus, tracking, servo control for traverse, spindle motor control and seek control.

1.2.1 Focus Close

FODRV

Far from disc

Lens

Close to disc

RFENV

VHALF

Focal point

After issuing the focus close command, the following processes are taken for both DVD and CD.

1. Measure and optimize signal levels First drive PU lens far from the disc and then drive closer to the disc. At the focal point met in the process of this move, measure signal levels of FE, AS and RFENV respectively, and optimize their levels for FE and AS (1 & 2 in the above figure).

2. Focus closing

Next, drive the lens far from the disc again to detect the closing levels of FE and AS. Then activate focus loop filter for closing focus (3 6).

3. Check closing Check the closing with signal levels of AS and RFENV (6 & 7).

Focus search in test mode can check the signal levels and focus drive voltages for FE, AS and RFEV.

1.2.2 Tracking Close

After issuing the tracking close command, the following processes are taken for both DVD and CD.

1. Tracking brake Measure one half cycle of the tracking cross and if the cycle is within the range of designation, output the brake

pals. Output direction of brake pals is determined by the phase relations of OFTR and TKC (TE's binarization) signals. After confirming that the swing of lens against disc is controlled, the brake stops and the closing begins. If the closing condition is not met within 10msec. after outputting brake, the brake stops and the closing begins.

2. Tracking closing Process the tracking drive hold with OFTR signal.

3. Check closing Check whether or not the track jump does not exceed the designated number within the designated term. Closing check will be time-out at 20msec. Retry using a command from the microcomputer.

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1.2.3 Track Jump

The system selects from three types of methods; i.e. interval jump, multi jump and traverse seek, according to the target number of moving tracks.

1. Interval Jump The detailed seek is capable due to the execution of repetitive one-track jumps. It is used when approaching to the target track or seek-operating to an adjacent track.

2. Multi Jump It counts both edges of the track cross signal TKC and moves for designated number of track counts.

3. Traverse Seek It controls the movement speed by measuring the time of the track cross signal TKC and manages the vibration of pickup generated upon movement to the minimum.

Types of target number of moving jumps illustrating the jump switch setting for both DVD and CD.

DVD 1-10 Interval Jump 11-100 Multi Jump 101-500 Combination of Multi Jump and Interval Jump Over 501 Traverse Seek The waveforms of track jumps are shown in the next page.

CD 1-10 Interval Jump 11-32 Multi Jump 33-500 Combination of Multi Jump and Interval Jump Over 501 Traverse Seek

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Interval Jump (1 Track)

Outer Jump Inner Jump

Multi Jump (32 Track)

Outer Jump Inner Jump

Traverse Seek (501 Track)

Outer Jump Inner Jump

Traverse Seek (5000 Track)

Outer Jump Inner Jump

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(1 Layer)

(0 Layer)

object lens

L0 L1

L1 L0

A D

B C

1.2.4 Focus Jump

Focus jump is a function corresponding to the single-sided or both-sided two-layers. Seen from the object lens, a forward layer is called 0 Layer (L0) and a farther one is called 1 Layer (L1).

The flow of focus jump is shown below.

1. Open tracking at the layer during play.

2. Issue a command to execute jump to the target layer.

3. At the jumped layer, replay by closing the tracking.

Also, the processes when issuing a jump command are as follows.

1. Accelerate the lens to the target layer until FE signal detects the acceleration completion level for focus jump. However, if the time of acceleration time-out reaches before detecting the acceleration completion level, the acceleration will compulsively stop.

2. Move lens with inertia instead of outputting the drive voltage until FE signal detects the deceleration initiation level.

3. Decelerate lens for the duration from detection of the deceleration initiation level to the deceleration completion level. However, if the time of deceleration time-out reaches before detecting the deceleration completion level, the deceleration will compulsively stop.

The waveforms of focus jump are shown below.

The waveforms of focus jump

L0 L1

L1 L0

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1.3 Automatic Adjustment Function

This system totally automates the circuit adjustments.

The details of automatic adjustments are explained respectively as follows:

1.3.1 FE, TE, AS and Offset Cancel

Each of analog signals for FE, TE and AS generated at FEP is converted into a digital signal by A/D converter inside servo block. Offset cancel is a function to cancel the input offset of A/D converter when the power is on.

1.3.2 VCO Gain Adjustment (VARI Adjustment)

It has a function to absorb dispersion of VCO gains among LSI solid by learning and to automatically adjust VCO gains for the constant allocation. Lock VCO to 186- multiplied frequency against the input clock of crystal criteria, read Frequency Control Value (FCNT), and then adjust VARI register so that the value becomes equivalent to the target FCNT value.

1.3.3 FE Normalization Adjustment

After A/D-converting FE signal level at servo block which was measured at focus close, adjust it to 190LSB at the digital equalizer input stage.

1.3.4 Spindle Gain Learning

Measure the duration from the halting state of spindle motor to the point reaching the fixed rotation speed for Gain adjustment. Then adjust in the way of absorbing torque dispersion on spindle motor.

1.3.5 Tracking Balance (TBAL) Adjustment

By applying Newton-Raphson method, search for a balanced point at which DC offset becomes 0 by vibrating

lens toward track direction at the time of the focus close and the tracking open.

1.3.6 Tracking Error Amplitude Learning

After vibrating lens toward track direction at the time of the focus close and the tracking open to A/D-convert the amplitude level to ADSC, adjust it to 190LSB at the digital equalizer input stage.

1.3.7 Focus Balance (FBAL) Adjustment

Adjust the focus position so that RFENV becomes maximum at the tracking close.

1.3.8 Focus Gain Adjustment and Tracking Gain Adjustment

Insert disturbance to servo loop at the tracking close and adjust to a target gain intersection.

1.3.9 AS Normalization Adjustment

After measuring AS signal levels for the designated number of samplings at the tracking close to A/D-convert by ADSC, the precise adjustment is made to set 64LSB at the digital equalizer input stage.

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All automatic adjustments can be confirmed by indicating their results at test mode.

List of Automatic Adjustment Coefficients

States

Power On

F Close

F Close (after TBAL)

T Close

Coefficients FE Offset TE Offset AS Offset Spindle Gain FE MAX FE MIN AS MAX FE Normalization TE MAX TE MIN TE Normalization F Gain T Gain AS Normalization

FBF0 0410 E8BA 1746 F96D 0693 0121 02E3 1D8B 547E BADE E7D3 10CB 3753 0125 02FE 1A7C 5ABC A544 E584 010C 0396 0100 0400 0100 0400 0128 03D0

DVD

FB5C 04A4 F740 08C0 F6B7 0949 0113 0447 1D5A 5663 A99D E2A6 12E2 45E4 0119 033D 0DB5 33D6 CC2A F24B 01D5 06F0

00EA 0364

Note: Coefficients are indicated in hexadecimal numbers.

All figures describe specifications at the production line. Disc applies DVD

REF-A1 for DVD and TCD-782 for CD.

1.4 CIRC Block (MN35103UB, MN35104UB:IC1501)

CIRC block contains digital signal processing function for CD-DA and CD-ROM (EFM demodulation and error correction), digital servo processing for spindle motor and 1-bit DA converter with digital filter (Differential OP amp output with secondary lowpass filter).

1.5 DRC Block (MN35103UB, MN35104UB:IC1501)

Digital Read Channel (DRC) provides A/D converter, adaptive equalization, bit-a-bit detector, digital PLL circuit, CPU interface and peripheral circuits for reading signals of optical disks.

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2 Back End Part

2.1 States of Power Supply

VD8V

VD5PU

BVC33

SRVDD33

VD5

F.E. Driver System DISC Detection LED

IC1001 AVCC, for 5V REG IC

IC1002 VCC, for 5V REG IC

IC2001 Changer CPU Power Supply

IC1651 SRAM Power Supply

IC1901 VCC33, for 3.3V REG IC

AVCC5(= 5.0V)

VCC5(= 5.0V)

VCC33(= 3.3V)

IC1851 DAC Q1551 Peripherals

F.E. System IC 1201 P.U Peripherals

IC 1501 AV CHIP etc.

VD5

2.2 States of Clock

Using 27MHz primary crystal (X1801), 27MHz buffer-out (VCLK & BECLK) audio clock (EXTCK & DACCLK [with 24M/33M/36M switches]) and F.E. part clock (MCK33) are produced with IC1801.

27MHz Crystal

IC1003

1.5V output DCDC converter

IC1801

Clock Generator

VCC15(= 1.5V)

States of Power Supply

BECLK

SO1 [24M]

AO1 [33M/36M]

EXTCK

MCK33

IC 1501 AV CHIP

IC1501 AVLSI 170Pin

IC 1802 selector

IC1501 AVLSI 172Pin

IC1501 92Pin F.E. Part Clock

DACCLK

IC1851 AUDIO DAC

VCC33

States of Clock

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2.3 Audio Circuit

The serial three lines of audio output from AVLSI is input to IC 1851 (Audio DAC) and the signal that had become analog audio is output from HOST I/F. For mute circuit, only AMUTE can be output at present, and Mute Tr is located at the product side.

Asfor6choutput,twokinds,2chrippingoutputtype,and6ch/2chrippingoutputcombinationtype,existbythe model.Itisdecidedbyproducttypeandspecification.

IEC958(Audiodigitaloutput)haswhatisequippedbythemodel,andthethingwhichisnotequipped.

CN1901 HOST I/F

SRCK IC1503 AVLSI

ADOUT0

LRCK

IC1851 Audio DAC

6ch-Multi channels are now unused.

IC1881 Buffer SW Ripping or 6ch digtal out

Audio Circuit

2.4 Video Circuit

Composite Video Signal is output from DAC circuit part in AVLSI. Output from HOST I/F via Buffer circuit.

IC1501

AVLSI

Video DAC circuit part

COMP

AVCC5

Q1551 peripheral Video buffer circuit

MCKENA

RO MCKENA

GNDAU

COMPO

CN1881

CN1551

CN1901 HOST I/F

Video circuit

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2.5 SDRAM I/F

Communication I/F between AVLSI and memory to allocate MPEG stream data as a buffer. Capacity of SDRAM is 128Mbit. Note that XCSM, XWE, XCAS, XRAS, XCSM for IC1570 are renamed respectively to NCSM, NWE, NCAS, NRAS, NCSM for IC1501.

MA0 11 MDQ0 31 MCK XWE (NWE) XCAS (NCAS)

IC1570 SDRAM

XRAS (NRAS) XCSM (NCSM)

IC1501 AVLSI

DQM0 DQM1 DQM2 DQM3

SDRAM I/F

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3 MECHANISM CONTROL

- Overview

The combination of load/eject operation, camgear motor (operation mode) operation, elevation operation and clamp operation enables the operation as changer mechanism module.

3.1 Loading system

Disc position is detected with 3 switches attached to mechanism unit, photo, and LED, and load/eject is performed by driving an E/L motor. *E/L is abbreviation of Elevation/Loading. (MG4 mechanism shares a motor like G3 mechanism, unlike G2 or MG3 mechanism.)

3.1.1 Detect system

The 3 switches, photo and LED operate load start/load end, disc form detection and watching disc eject.

3.1.2 Drive system

Controlling an E/L motor by the control unit enables the following function:

Loading of disc Ejecting of disc

a) Drive system

It controls drive direction by output E/LFWD, E/LREV from the microcomputer (IC2001), and 3 values of drive voltage by Hi-Z/H/L of E/LVOL2.

LOADPHT

LOADSWR

LOADSWL

IN/SW

IC2001 98

E/LVOL1

(no use)

MECHANISM

CONTROLLER

730

At the time of loading E/L+<E/L- ; (E/LFWD; L, E/LREV; H) At the time of ejecting E/L+>E/L- ; (E/LFWD; H, E/LREV; L)

Drive voltage (E/LVOL2=Hi-Z) ; 7.9V Drive voltage (E/LVOL2=H) ; 7V Drive voltage (E/LVOL2=L) ; 4.8V

E/LFWD

E/LREV

E/LVOL2

VD5PU

IC1240

3+3ch

DRIVER

E/L+

E/L

MOTOR

E/L-

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b) Drive sequence

At the time of loading:

1 One of LOADPHT, LOADSWR, LOADSWL starts driving with H. 2 All of LOADPHT, LOADSWR, LOADSWL detect H at the same time. 3 Detecting H of INISW. 4 Detecting L of LOADSWR. 5 Detecting L of LOADSWL and stopping E/L motor.

LOADPHT

LOADSWR

LOADSWL

At the time of ejecting:

1 Starting driving H of LOADSWR. 2 Detecting L of INISW. 3 Detecting L of LOADSWL and after reverse brake (16ms), stopping E/L monitor.

INISW

LOADPHT

LOADSWR

LOADSWL

INISW

3.2 Elevation system

3.2.1 Detect system

It uses a linear position sensor (VR1), converts stage chassis level to voltage value and captures it by a microcomputer A/D to detect absolute position.

Detect circuit

Linear position sensor

VR1

ELVSNS

SWDVDD

VR11

ELVREF

GND

3.2.2 Drive system

Controlling an E/L motor by the control unit enables the following function. Elevation function

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a) Drive circuit

t controls drive direction by output E/LFWD, E/LREV from the microcomputer (IC2001), and 3 values of drive voltage by Hi-Z/H/L of E/LVOL2.

Driving upper direction E/L+>E/L- , (E/LFWD; H, E/LREV; L) Driving lower direction E/L+<E/L- , (E/LFWD; L, E/LREV; H)

Drive voltage ( E/LVOL2=Hi-Z) ; 7.9V

( E/LVOL2=H) ; 7V ( E/LVOL2=L) ; 4.8V

LOADPHT

LOADSWR

LOADSWL

IN/SW

IC2001 98

MECHANISM

CONTROLLER

730

E/LVOL1 E/LVOL2

(no use)

E/LFWD

E/LREV

VD5PU

IC1240

3+3ch

DRIVER

E/L+

E/L

MOTOR

E/L-

b) Drive sequence

1 Driving continuously to the position of brake start. 2 Detecting of passing the position of brake start and starting short brake. 3 Starting of driving pulse to reach OK range. After confirmation of entering OK range, it is completed.

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3.3 Camgear motor system

3.3.1 Detect system

It uses a rotary position sensor (VR2), converts a camgear rotation angle to voltage value and captures it by a microcomputer A/D to detect absolute position.

Detect circuit

SWDVDD

VR21

CAMREF

Rotary position sensor

VR2

GND

CAMSNS

3.3.2 Drive system

Controlling a cam gear motor by the control unit enables the following function:

Open/close of shutter Open /close of tray tab Division of tray Rotation operation of CRG chassis (moving to the play position) Release of mechanism lock Drive of eject arm

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a) Drive circuit

It controls drive direction by output CAMFWD and CAMREV from the microcomputer (IC2001), and two values of drive voltage by Hi-Z/H of CAMVOL.

Driving CRG chassis to the outer direction (direction of EJECT position)

AM+>CAM-; (CAMFWD; H, CAMREV; L) Driving CRG chassis to the inner direction (direction of PLAY position)

CAM+<CAM-; (CAMFWD; L, CAMREV; H) Drive voltage CAMVOL=Hi-Z; 8V

CAMVOL=H; 7V

VR2

VR21

CAMSNS

CAMREF

IC2001 94

MECHANISM

CONTROLLER

CAMFWD

CAMREV

IC1240

3+3ch

DRIVER

CAM+

CAM-

CAMVOL

VD5PU

b) Drive sequence

1 Driving continuously to the position of brake start. 2 Detecting of passing the position of brake start and starting short brake or reverse brake. 3 Starting of driving pulse to reach OK range. After confirmation of entering OK range, it is completed.

CAMGEAR

MOTOR

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3.4 SPDL clamp system

3.4.1 Detect system

It is composed of two switches such as HOME switch used in servo system (S1) and CLAMP switch (S2) for checking a shutter of the tab inside it.

3.4.2 Drive system

It operates a pickup unit to move to inner side from normal replay position and moves clamp mechanism of a DISC.

a) Drive circuit

HOME

CLAMP

IC2001 91

MECHANISM

CONTROLLER

SD2

IC1501

CONTROL

SD1

SD0

VHALF

IC1240

3+3ch

DRIVER

CO-

CARRIAGE

MOTOR

CO+

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Cam gear motor

Elevation motor

Carriage motor Spindle motor

Tray separation operation Carriage mechanism assembly rotation operation Eject arm operation Shutter opening/closing operation Tray claw opening/closing operation Elevation operation Loading/ejection rollers rotation operation Search operation Disc clamp claw opening/closing operation Disc rotation operation

2. MECHANISM OVER VIEW

2.1 STRUCTURE OF MECHANISM AND OPERATION OF COMPONENTS

The mechanism consists of three blocks, i.e., a main chassis, which is the base of the entire mechanism, stage and tray. Various kinds of operations are performed according to how those blocks are positioned in relation to one another. The stage block consists of CRG, stage and loading unit; and the loading unit moves up and down with the stage block. The stage block is joined to the main chassis section with a stair and link lever. Sliding the stair moves the entire stage block moves up and down. Moving the link lever allows the CRG to rotate to play a disc. The tray block consists of six trays. Similarly to the stage block, the tray block moves up and down as the stair slides. To play the disc, the stage block moves toward the tray block at a location where the disc can be played. Then, the tray group is separated by the action of cylindrical cams, the CRG is inserted and the disc is clamped. To load or eject the disc, the stage block moves to its lower end. Then, the tray block moves the target disc to a location where the disc can be loaded or ejected. The tray group is separated by the action of cylindrical cams. Then, the disc is loaded or ejected.

To carry out the aforementioned operation, the mechanism is provided with four motors. The operations listed in the table below are carried out by using the motors as a motive power.

Cam gear motor

Elevation motor

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Carriage motor

Spindle motor

The operations carried out using the motors as a motive power are described below.

2.2 CAM GEAR MOTOR (OPERATION OF THE CAM)

The following five operations are carried out by using the rotary motions of the cam gear motor as a motive power.

a.Tray separation operation b.Tray claw opening/closing operation c.Carriage mechanism assembly rotation operation d.Eject arm operation e.Shutter opening/closing operation

Cam motor

Eject arm

Stage link lever

Cam gear

Cylindrical cam drive gear

Eject driving arm

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a.Tray separation operation

The rotary motion of the cam gear motor is transferred to the cylindrical cams by way of its cam. The tray is separated by rotations of the cylindrical cams. This makes a space into which the CRG is inserted when playing the disc. The mechanism of the cylindrical cams to separate the tray is as shown below.

In addition, the appearance of trays being separated at the time of loading or playing disc #3 is shown below as an example.

Cylindrical cam, green: It is mounted on the stage. It moves up and down in synchronous with the stage.

Cylindrical cam, yellow: It is mounted on the upper tray holder. It goes up-and-down in synchronous with the holder.

Cylindrical cam, red: It is fixed on

the chassis.

Cylindrical cam, green: Used to select a

target tray

Cylindrical cam, yellow: Used to support the

tray at the time of loading a disc

Cylindrical cam, red: Used to support the

tray at the time of playing a disc

3F ELEV O.K. (LOAD) Stage 1F Tray group 3F

DISC#3 LOAD Stage 1F Tray group 3F

3F ELEV O.K. (PLAY) Stage 3F Tray group 1F

DISC#3 PLAY Stage 3F Tray group 1F

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b.Tray claw opening/closing operation

To prevent a disc from dropping, each tray is provided with three claws for clamping the disc. When the

cylindrical cams rotate, the tray is separated and tray claws are simultaneously opened/closed.

Tray claw, right

Tray claw, left (2 pcs.)

c.Carriage mechanism assembly rotation operation

D stage link lever and CRG rotating lever are in mesh with each other. The CRG block rotates to travel to the disc playing position in synchronous with the stage link lever movements. The CRG block is fixed with the CRG lock arm and other components at the disc playing position.

CRG rotation lever

CRG rotation arm

CRG lock arm

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d.Eject arm operation

At the time of ejecting a disc, the eject arm is rotated by the force transferred from the eject driving arm to push

the disc out.

e.Shutter opening/closing operation

ELEV 2 gear is slid by the force transferred from the eject driving arm. At the same time, the shutter, which

protects the disc insertion slot engaged with the ELEV 2 gear unit, opens/closes.

ELEV 2 gear unit : It slides by the force transferred from the eject driving arm.

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2.3 ELEVATION MOTOR

The following two operations are carried out using rotations of the elevation motor as a motive power.

a.Elevation operation b.Load/eject roller rotation

a.Elevation operation

Where the ELEV O.K. state, the stair is slid by rotations of the elevation motor. The stair is in mesh with the tray block and stage block. Therefore, the tray block and stage block move up and down in synchronous with the stair sliding.

The tray block and stage block change their positions among the following 11 ones according to a change in the stair position. The stair position is detected by the linear position sensor.

Stair position

1 2 3 4 5 6 7 8 9

Stage block

1F 1F 1F 1F 1F 1F 2F 3F 4F 5F 6F

Tray block

6F 5F 4F 3F 2F 1F 1F 1F 1F 1F 1F

When the stair is located at one of positions 1 to 6 the stage does not move up and down but stays at 1F. In this case, the tray group moves up and down to select a disc. To load or eject a disc, the stair should be located at one of those positions.

When the stair is located at one of positions 6 to - the tray group does not move up and down but stays at 1F. In this case, the stage moves up and down to select a disc. To play a disc, the stair should be located at one of those positions.

a.Elevation operation

When the stage is on its lowest layer, the roller drive gear joins the row of gears of the elevation motor. As a

result, the load/eject roller rotates as the elevation motor rotates. This draws/ejects a disc.

At the time of loading/ejecting a disc, the ELEV 2 gear slides to separate the row of gears which transfers the

stair force. Therefore the stair does not move.

Roller drive gear: It moves up and down simultaneously with the stage.

ELEV motor

ELEV 2 gear: It slides.

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2.4 CARRIAGE MOTOR AND SPINDLE MOTOR

When playing a disc, the spindle motor works to rotate the disc. Search operation is carried out by reducing the

rotating speed of the carriage motor with a worm and driving the feed screw.

At the time of playing, the disc is clamped with the three claws. The claws open to unclamp the disc when the support wheel mechanism shifts the pickup to the support wheel, or the claws close to clamp it for the search operation.

Pickup

Disc clamp claws (open)

Support wheel

Feed screw

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2.5 DETECTION OF A DISC BY SENSORS AT THE TIME LOADING

A disc is detected by a phototransistor, right and left load switches and INIT switch. Phototransistor: Light emitted by the LED mounted on the underside of the roller is reflected by the lighting conductor on the shutter. When the light is shielded by the disc, the phototransistor is brought to its Hi status. Load switch, right: It is mounted on the right side of the disc insertion slot. When the white resin lever is pressed to the right by the disc, the switch is brought to its Hi status. Load switch, left: It is mounted on the left side of the disc insertion slot. When the white resin lever is pressed to the left by the disc, the switch is brought to its Hi status. INIT switch: It is mounted at the right back of the stage. When the resin arm moves from its home position, the switch is brought to its Hi status.

INIT switch

Load switch

Phototransistor

The group of sensors recognizes the disc state as shown below.

Eject

Load

Photo

Detection switch, right

Detection switch, left

INIT SW

Loading starts

Loading completesEjection stops

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2.6 OPERATIONS OF THE MECHANISM

The following operations are described below based on the explanation of a series of combined operations of the

elements given above.

Initial operation of the mechanism

Loading operation

Ejection operation

Play operation

2.6.1 Initial operation of the mechanism

When the power is turned on, the mechanism starts initialization. It checks all trays starting from #6 for the

presence of discs. The mechanism recognizes the tray(s) which currently has a disc.

2.6.2 Loading operation

Operation sequence from the ELEV O.K. state to the loading of a disc is carried out as described below:

1 Tray into which a disc is to be ejected is selected by moving the tray group up and down by the elevation

operation.

2 Tray separation and shutter opening actions are taken simultaneously by the cam operation. 3 When the user inserts a disc into the selected tray, the phototransistor detects the inserted disc. 4 The disc is drawn inside by rotary motions of the roller. 5 The disc drawn into the predetermined position is detected.

2.6.3 Ejection operation

Operation sequence from the ELEV O.K. state to the ejection of a disc is carried out as described below:

1 Tray from which a disc is to be inserted is selected by moving the tray group up and down by the elevation

operation. The tray from which the disc is to be ejected moves to the disc insertion slot.

2 Tray separation and shutter opening actions are taken through the cam operation. Then, the eject arm

actuates to push the disc forward. At the same time, the roller starts rotating.

3 The disc is ejected by rotary motions of the roller. 4 It is detected that the user draws out the disc from the slot. 5 The steps 1 and 2 are carried out in reverse order by the cam operation. This closes the shutter.

2.6.4 Play operation

Operation sequence from the ELEV O.K. state to the play state is carried out as described below:

1 The stage moves to the position of the tray which has the disc to be played by the ELEV operation. 2 Tray separation and CRG rotation actions are taken by the cam operation. 3 The disc is clamped.

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The aforementioned operation sequence is reversed to shift from the play state to the ELEV O.K. state.

Disc changing is carried out by shifting from the current play state to the ELEV O.K. state once, then shifting to the next play state. For example, to change the disc 1 to disc 6, the disc 1 play status is shifted to the ELEV O.K. status first, then the ELEV O.K. state is shifted to the disc 6 play state.

The mechanism state transition diagram is given below. Transition of the state of stage and tray group by the elevation operation is presented in vertical direction of the diagram. Transition of the state of tray separation and CRG position by the cam operation is presented in horizontal direction of the diagram. As shown in the diagram, the position of tray group and stage at the time of loading and ejection is same with that at the time of play only in the case of the disc 1.

Play position

Tray separation/CRG rotation

ELEV O.K. position

Vertical: ELEV operation Horizontal: Cam operation

6F Play height

ELEV operation:

STG elevation

Position detected by the linear position sensor

1F Play & loading height

Tray groups elevation

Cam operation: Position detection by the rotary position sensor

6F Loading height

Loading position

Eject position

Linear position sensor Rotary position sensor

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3. DISASSEMBLY

3.1 PREPARATION FOR REMOVAL

1 Place the mechanism in the ELEV O.K. state. 2 Eliminate static electricity with a wrist band, etc. 3 Carry out short-soldering. (There are two points to be short-soldered. It is enough to solder one of them.) 4 Slide the lock section of the connector to fix a flexible cable and remove a flexible cable. (2 points)

Short-soldering

Shield plate

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3.2 HOW TO REMOVE THE UPPER CASE

1 Remove poly washer. Remove the ELEV 4 gear. Once the ELEV 4 gear is removed, the stair can be slid as desired.

Stair

ELEV 4 gear

*In the illustration above, the ELEV 3 gear is removed. But the ELEV 3 gear is not required to be removed.

2 Manually slide the stair (clockwise) to raise the stage block to the uppermost floor.

3 Remove front right spring A. 4 Change the position of the back left spring B from the home position to a temporary position. (The hook at

the temporary position is fixed on the stage. This means that the stage needs to be raised to the uppermost floor to enable easy re-positioning of the spring.)

Arm

Spring B

Home position

Temporary position

Front

Spring A

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4 Manually slide the stair to lower the stage. 5 Remove four screws which are used to secure the upper case. Remove the upper case. 6 Lightly slide the snap-fitted top arm to remove it.

Top arm

This screw is not required to be removed.

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3.3 HOW TO REMOVE THE STAIR

1 Slide the stair in the direction for lowering the tray block until it will go no further. (See the photo shown below.)

2 Remove three stairs.

Direction of slide

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3.4 HOW TO REMOVE THE STAGE

1 Desolder the back right cam motor. Then, remove the flexible cable.

2 Draw out the stage block in vertical direction. 3 Lift up the triangular top plate in the vertical direction, then slide it away from you until it comes off. 4 Remove the tray and cylindrical cam from the stage.

Desolder this part.

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3.5 HOW TO REMOVE THE LOAD FRAME

1 Remove the springs from both sides of the roller. Remove the roller. 2 Desolder and remove the flexible cable. 3 Remove the screws which are used to secure the load frame at four points. Remove the load frame.

Note: Remove springs from metal plate hook, but not necessarily from the resin collar.

Screw

3.6 HOW TO REMOVE THE CRG (ONLY FOR REFERENCE SINCE THIS PROCEDURE IS HARD TO BE COVERED BY OUR SERVICE)

1 Slide the part with which the stage link lever is in mesh toward you. Turn the CRG to move it to the play

position.

2 Remove the resin part and springs. 3 Remove the CRG.

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3.7 HOW TO REMOVE THE ELEV MOTOR

1 Check that the ELEV3 gear is removed.

ELEV3

2 Remove the solder of two lines (red and white) on the rear side of main chassis.

3 Unscrew the three screws shown in the figure.

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4 Remove the resin part. At this time, it can be removed easily by applying edgewise pressure to the point shown in the figure using the straight slot screwdriver.

5 Pull out the gear shaft, and remove the gear.

6 Unscrew the two screws fixing the motor and remove the wire lead.

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4. HOW TO ASSEMBLE

4.1 CHECK BEFORE ASSEMBLING

Check the location of CAM gear of main chassis. As shown in the photo below, check that the hole of main chassis can be seen from the hole of cam (it is not necessary to match it perfectly).

Location of CAM gear

Check the location of stage lock arm of STG. It is not like as shown in the figure below, move the arm to the position of mark. In a similar way, for the white resin part, move the arm to the position as shown in the photo below.

Location of STG lock arm

Contacting

Positioning to the mark

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At this time, check the part pointed in the figure does not drop off the groove. When it is dropping off the groove, set it paying attention to the position shown in the photo below.

Location to attach the white resin

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4.2 ASSEMBLING THE ELEV MOTOR (When the ELEV motor is not removed, this step is not necessary)

Press the gear into motor, and attach the wire lead.

Connect the white wire lead to the white mark side on bottom panel of motor.

Mark on bottom panel of motor

How to connect the wire lead

Fix the motor to the bracket with screws.

How to fix the bracket

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Fix the resin part to the main chassis.

Hook the tip of resin part

Insert this prong to the hole of resin

How to fix the resin part

Secure the three screws.

How to fix the ELEV motor unit

Solder the wire lead to the board on the rear side of main chassis, and fix it with tape.

tape

RD: red WH: white

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4.3 ASSEMBLING THE CAM MOTOR

Press the gear into motor, and fix it to the bracket with two screws. At this time, take care of the direction to fix the gear. Check the location of mark is as shown in the photo shown in lower right.

Mark

How to fix the motor

Attach the CAM gear, and fix the CAM motor unit with two screws.

Mark for attaching the motor

CAM gear

Location to attach the CAM gear

Location to attach the CAM motor unit

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4.4 ASSEMBLING THE STAGE UNIT

1 Prepare the tray. Pile the 6 trays so that the tray with steel plate is at the bottom.

Tray (6-pile)

2 Prepare the STG.

Attach the cylinder cam OUT to the stage. At this time, attach the black cylinder cam at the right back.

Location to attach the cylinder cam OUT

Rotate the matched cylinder cam and match the marks of STG and cam (for all cams).

Left back Right back

Left front

Location of mark of cylinder cam OUT

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3 From rear side of main chassis, insert the assembly jig to the cylinder cam gear (x3).

Assembly jig

GGF1538 x 3

After inserting the assembly jig

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4 Insert the cylinder cam IN (x3). At this time, set the key part of cylinder cam gear to the key groove of inside of cylinder cam IN. Match the tip of assembly jig to the depressed portion on the bottom panel of cylinder cam IN.

Key groove

Depressed portion

Key part

Cylinder cam IN Cylinder cam gear

5 Attaching the STG. At this time, as the right front part does not have a bracket, support it with something.

After attaching the STG

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At this time, check the three parts shown in the figure below fit. *Especially, for the right panel, take care so that the metallic bar protruding from the main chassis fits the both of stage link lever and white resin part.

Left front Right front *Right panel

* In this operation, take notice that the cylinder cam whose mark is matched in step 2 may jolt out of alignment. If it jolts out of alignment, reposition the key groove and mark.

6 Place the tray. At this time, the tray pin should be inserted to the location shown in the figure.

State of attached tray

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7 Insert the tray holder. Insert the tray holder to the tip of cylinder cam IN, and then slide it to forward and fix it. At this time, take notice that the black sheet on the rear side of tray holder sticks easily in the tray. Check it is properly set (3 parts) as shown in the figure at lower right.

Slide

Direction to slide the tray holder Tray holder rigid part

8 Pick up the main chassis slowly, and pull out the jig.

The STG unit is properly assembled

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4.5 FROM ATTACHING THE CASE ABOVE TO COMPLETION

1 Attach the front stair. Check that is properly set (5 parts) as shown in the figure below.

Next, slide the attached stair to left side slightly (figure below).

2 Attach the stair on left side safe. Check that is properly set (6 parts) as shown in the figure below.

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3 Attach the rear stair. Before attaching the rear stair, slide the Potentiometer on the rear panel to the location shown in the figure below.

Attach the stair. Check that the eight positions shown in the figure below are properly set.

* When attaching the front stair, fix the front side to the upper panel, and when attaching the left panel stair and rear panel stair, fix the side panel to the upper panel.

Slide the stair to the left.

Check the all stairs are fitted in the groove, and slide the stairs to the left.

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4 Solder the two cam motors.

5 Check the side panel flexible cable is not removed.

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6 Fit the shutter and upper case, and attach it to the mechanism unit.

Upper case

Shutter

* As shown in the figure below, it is easy to assemble the unit by fitting the right side opening

the shutter and right side after fitting the left side. The state of mechanism is recommended to be at 1F play position.

How to attach the upper case

Hook the detection lever of front to the rear side of front panel of shutter. * Push the detection lever to the left side lifting the left part of upper case.

Normal

Abnormal

Location of detection lever

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7 Secure the screws. Secure the four screws on the panels below.

Left panel

Rear panel

Right panel

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8 Lift the stage to the top floor by sliding it, and hook the spring at left back. Hook the spring which is temporarily hooked to the A part to B part.

Spring of left back part

* If failing to hook the spring, remove the STG again, and hook the spring again as shown in the photo below.

Left back part of stage frame

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9 Hook the right front spring. Hang the spring on the hook shown in the figure below.

Right front spring

0 Attach the top arm. As shown in the figure, attach it sliding it aside after insert it vertically from above.

A stage mechanism is lowered. (Since the stage mechanism has been raised with 8, a top arm is not attached unless it lowers.) As shown in the photo below, press it with a finger, and set it as shown in the right figure.

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! When the ELEV3 gear is removed, set it by pressing as shown below.

ELEV3 gear

Attach the ELEV4 gear, and fix it with poly washer.

@ Insert the two flexible cable as shown in the figure below, and slide and lock the claw, and then remove the short-soldering.

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CX-315054

Pioneer CX-3150 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual