PIONEER CX-3078 - Service Manual Immediate Download

ORDER NO.

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 2004

CRT3257

DVD MECHANISM MODULE(MS-3V1)

CX-3078

This service manual describes the operation of the DVD mechanism modules

incorporated in the models listed below.

When performing repairs use this manual together with the specific manual for the

model under repair.

Model No.

Service Manual

DVD Mechanism Module

AVH-P6600DVD/UC

CRT3193

CXK6410

DVH-P5650/RC

CRT3264

CXK6414

K-ZZU. MAR. 2004 printed in Japan

CONTENTS

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

2. MECHANISM DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3. DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

CX-3078

1234

123

+5V

0.25V

0.5V

0.59V

0.18V

0.22V

CDLD0

CDLD1

CN1101

LPCO2

PU unit

LDONCD

LDPOWER

LDONDVD

LPC2

3.9

3.9 3.9 3.9

0.17V

0.25V

0.18V

+5V

DVDLD0

DVDLD1

LPCO1

LPC1

3.9

3.9 3.9 3.9

Reg.

78LD

DVD

78MD

65LD

65MD

1 Front End Part (MN35103UB, MN35104UB:IC1501)

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)

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).

1. CIRCUIT DESCRIPTIONS

CX-3078

678

OFFSET ADJ

1+(Pfbal/0x10000)

1-(Pfbal/0x10000)

Analog block

Servo block

FE+

Pfepofs

OFFSET ADJ

FE-

Pfenofs

1+(Pfbal/0x10000)

1-(Pfbal/0x10000)

1+(Pfbal/0x10000)

1-(Pfbal/0x10000)

VIN6

VIN7

VIN8

VIN5

CN1101

Dfesv

x1 or x4

OFFSET ADJ

Analog block

Servo block

TE+

Pfepofs

OFFSET ADJ

TE-

Pfenofs

VIN2

VIN3

VIN4

VIN1

CN1101

Dfesv

x1 or x4

OFFSET DAC

Analog block

Servo block

TE+

Pfepofs

OFFSET DAC

TE-

Pfenofs

VIN9

VREFH

20k

VHALF

CN1101

Dfesv

- 6dB 15dB(3dB STEP)

30kHz

0dB/12dB

VIN10

VREFH

20k

VHALF

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+= - (B1+B3) and FE- = - (B2+B4) after adding a focus

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+)- (FE- ).

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

make the formula of TE=A- C.

DVD (TE from phase difference)

CD (3-beam TE)

CX-3078

1234

123

1.2 Servo Block (MN35103UB, MN35104UB:IC1501)

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

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.

1.2.1 Focus Close

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.

Close to disc

Far from disc

Lens

VHALF

Focal point

RFENV

FODRV

CX-3078

678

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.

1-10 Interval Jump

11-32 Multi Jump

33-500 Combination of Multi Jump and Interval Jump

Over 501 Traverse Seek