PIONEER CX 3183 Service Manual

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 2006

ORDER NO.

CRT3655

DVD MECHANISM MODULE(MS4)

CX-3183

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-P7800DVD/UC CRT3681 CXK6500

AVH-P7800DVD/RE CRT3682 CXK6500

CONTENTS

1. CIRCUIT DESCRIPTIONS(FE PART) . . . . . . . . . . . . . . . . . . . . . . . 2

2. CIRCUIT DESCRIPTIONS(BE PART) . . . . . . . . . . . . . . . . . . . . . . 11

3. MECHANISM DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4. DISASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

K-ZZU. MAY 2006 printed in Japan

1234

1. CIRCUIT DESCRIPTIONS(FE PART)

1 Front End Part (MN2DS09AAUB:IC1501)

MN2DS09AAUB 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/Dolby Dijital/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, The waveform of servo system on the front end, FE, TE and AS is not

seen in MN2DS09AAUB,like the DVD mecha-module (MS3V1) of CX-3078.

1.1 Analog Block (MN2DS09AAUB:IC1501)

An analog block becomes the following functions.

1.Standard power supply circuit

2.The servo system/ The DPD signal processing system circuit Gain change amplifier an Low pass filter(LPF)

3.RF signal processing system circuit RF addition circuit , Inline circuit and Variable Gain Amplifire(VGA) circuit

4.Laser power control (LPC) circuit

5.The A/D converter for servo (10bit, 5bit-4ch) , PWM

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). MN2DS09AAUB 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 6 Ω (1.5 Ω x 4=6 Ω ). For DVD (CD), the results are approx. 50 mA (45 mA). The potential difference between DVDLD1(CDLD1) and 5 V is set to approx. 300 mV (270 mV).

IC1501

CDLPCPOWON

DVDLPCPOWON

5 bit DAC

LPCOFS [4.0]

LPCADJMODE

amp1

Standard voltage

LPCPW[3.0]

amp2

DVD : 180 mV CD : 170 mV

126

125

124

123

LPCO2

LPC2

LPCO1

LPC1

+5 V

1.5 Ω 1.5 Ω 1.5 Ω 1.5 Ω

CDLD0

DVDLD0

CDLD1

DVDLD1

CN1101

78 LD

78 MD

65 LD

65 MD

CDLDDVD

PU Unit

+5 V MD

1234

CX-31832

1.1.2 FE Generation Circuit

Focus Error (FE) Generation Circuit

In IC1501 inside, the AD translation of the signals RF1 and RF2 from PU is carried out, and they are taken in. Then, offset cancellation is considered, differential is taken and it is set to FE.

FE = (FE1) - (FE2)

After 10bit ADC

FE2

VIN8

VIN7

VIN78

OFS[1:0]

VIN78 G

[1:0]

FE1

CN1101

LPF Fc=

50 kHz

Selector

Buffer

amplifier

ADC drive amplifier

MAX:2 V[P-P]

G=6/ 7.5/ 9/

10.5/ 12/13.5/ 15/ 16.5/ 17/

19.5 dB

10 bit

ADC

0 - AVDD

64 step

GAVIN5

G = 3/9 dB

Pvin7ofs

Dfepsv

1+ Pfbal0,1 / 0x0100

Pfe_g

FE1

FE2

GAVIN[4:0]

LPF Fc=

50 kHz

offset adj. 6 bit DAC

OFFVIN[5:0]

Pvin8ofs

Dfemsv

1- Pfbal0,1 / 0x0100

134

133

Offset is set up so that it may be settled in

input D range of 10 bit ADC

at the time of Max:2 V[P-P] typ:1.6 V[P-P].

Input D range

max 0-3.3 V

(It is dependent on

power supply voltage)

5678

CX-3183

1234

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

DVD (TE from phase difference)

CN1101

115

116

118

117

VIN1RF

VIN2RF

VIN3RF

VIN4RF

VIN1RFOUT

VIN2RFOUT

VIN3RFOUT

VIN4RFOUT

LPF

11.3 M/5.7 MHz

LPF

11.3 M/5.7 MHz

LPF

11.3 M/5.7 MHz

LPF

11.3 M/5.7 MHz

HPF

100 kHz

HPF

100 kHz

HPF

100 kHz

HPF

100 kHz

OFFVIN[5:0]

CD (3-beam TE)

offset adj. 6 bit DAC

DPDOUT1

DPDOUT2

DPDOUT3

DPDOUT4

0 - AVDD

64 step

5 bit

ADC

5 bit

ADC

DPD

5 bit

ADC

5 bit

ADC

Input D range

max 0-3.3 V

(It is dependent on

power supply voltage)

VIN10

F+H _G+H

E+G _F+H

CN1101

VIN9

134

133

VIN78

OFS[1:0]

VIN78 G

[1:0]

LPF Fc=

50 kHz

LPF Fc=

50 kHz

Selector

Buffer

amplifier

GAVIN5

G = 3/9 dB

ADC drive amplifier

MAX: 2 V[P-P]

G=6/ 7.5/ 9/

10.5/ 12/13.5/ 15/ 16.5/ 17/

19.5 dB

GAVIN[4:0]

Offset is set up so that it may be settled in

input D range of 10 bit ADC

at the time of Max:2 V[P-P] typ:1.6 V[P-P].

10 bit

ADC

CX-31834

1234

After 10bit ADC

Pvin9ofs

Dtepsv

1+ Ptbal0,1 / 0x0100

Pfe_g

E+G_E+F

F+H_G+H

Pvin10ofs

Dtemsv

1- Ptbal0,1 / 0x0100

1.2 Servo Block (MN2DS09AAUB:IC1501)

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

1.2.1 Focus Close

Far from disc

Close to disc

Lens

VHALF

Focal point

RFENV

FODRV

5678

CX-3183

1234

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.

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.

CX-31836

1234

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

5678

Tracking-on process

TKC

OFTR

TRDRV

Tracking brake

Tracking on

CLPTM

TROK_TM

Drive hold by OFTR

Tracking failure

detaction

V1 V2 V3

V2=V1 X TKCLP:L/256 V3=V2 X TKCLP:L/256

#In this case, int TKCLP:L=0 V2=0

V4 V5 V6

V5=V4 X TKCLP:H/256 V6=V5 X TKCLP:H/256

CX-3183

1234

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

CX-31838

1234

5678

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).

(1 Layer)

(0 Layer)

object lens

The waveforms of focus jump are shown below.

The waveforms of focus jump

L0 L1

L1 L0

L0 L1

B C

A D

L1 L0

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.

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 VIN7,VIN8,VIN9 and VIN10 Offset Cancel

Each of analog signals for VIN7, VIN8, VIN9 and VIN10 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 standard frequency for study, read Frequency Control Value (FCNT), and then adjust VARI register so that the value becomes equivalent to the target FCNT value.

CX-3183

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