Pioneer CX-3268 Service manual

ORDER NO.

PIONEER CORPORATION 1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, 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 2010

CRT4534

DVD MECHANISM MODULE(MS7)

CX-3268

- 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

AVH-5200BT/XNEW5 CRT4536 CXK6900

AVH-P5200BT/XNUW5

AVH-5200DVD/XNEW5

AVH-P5200BT//XNUC CRT4537 CXK6900

AVH-P5250BT/XNRD

AVH-P5200DVD/XNUC

AVH-P5250DVD/XNRC

AVH-P5250DVD/XNRD

AVH-P5250DVD/XNRI

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

2. MECHANISM DESCRIPTIONS ......................................................................................................................17

3. DISASSEMBLY...............................................................................................................................................21

K-ZZZ. MAR. 2010 Printed in Japan

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1. CIRCUIT DESCRIPTIONS

DV5U Chip

(MN2DS0018MAUB : IC1501)

2.2 2.2 2.2 2.2

103

104

105

106

2.2 2.2 2.2 2.2

CDMPD

DVDMP

78 LD

(CD)

65 LD (DVD)

MN2DS0018MAUB is 1-chip LSI for DVD-Player. The DVD-Player system can be constructed by connecting this LSI with driver IC, SDRAM, Flash-ROM, and Audio-DAC etc. This LSI has the front end part (SODC / FE) for carrying out RF signal processing / servo processing / decode processing, the AV decoder part (backend / BE) for carrying out video decode processing of MPEG1 / MPEG2 / JPEG etc. and audio decode processing of DVD-Audio / Dolby Dijital2 / DTS / MP3 etc., and the system controller for controlling the system built-in. The front end part realizes various processing such as optical head signal arithmetic processing, RF signal processing, digital signal processing of DVD standard-compliant DVD-ROM play (16-8 demodulation, error correction), digital signal processing of CD-DA / CD-ROM (error correction), AV decoder transfer, servo control, spindle motor control, and seeking control. With MN2DS0018MAUB, the waveform of servo system of front end such as FE, TE, AS cannot be seen in a same way as DVD mechanism module (LS1) CX-3250. Keep it in mind.

1.1 Analog block (MN2DS0018MAUB : IC1501)

1 Front end part (MN2DS0018MAUB : IC1501)

The functions of analog block are as below:

1. Reference power supply circuit

2. SERVO system / DPD system signal processing circuit Gain switching amplifier and Low Pass Filter (LPF)

3. RF signal processing circuit RF adder circuit, in-lining circuit, Variable Gain Amplifier (VGA) circuit

4. Laser power control (LPC) circuit

5. A/D converter for SERVO (10bit), DPD system comparator, PWM

1.1.1 APC circuit The optical output of laser diode (LD) has a large negative temperature character. Consequently, if LD is driven at the rated current, a constant optical output cannot be obtained. APC circuit is the circuit for controlling the current so that the output becomes constant for the monitor diode (MD). MN2DS0018MAUB has two types of APC circuit for DVD and CD built-in. In case of DVD (CD), the LD current can be obtained by dividing the voltage measurement value between DVDLD1 (CDLD1) and 5 V by 8.8 ohm (2.2 ohm x 4 = 8.8 ohm). In case of DVD (CD), the LD current becomes approximately 45 mA (40 mA). The voltage difference between DVDLD1 (CDLD1) and 5 V will be 396 mV (352 mV).

PU unit

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1.1.2 FE generation circuit Focus error (FE) generation circuit

The signals FE1 and FE2 from PU are AD-converted in IC1501 and imported. Then, the differential is taken by taking the offset cancel into account and it becomes FE. FE = (FE1) - (FE2)

CN1101

FE2

FE1

FE2

116

115

After 10bit ADC

Offset cancel

Input AMP BufferLPF

VIN8

Gain switching

-6dB, 0dB, 9 5dB

VIN7

1+Pfbal0,1/0x0100

1-Pfbal0,1/0x0100

LPF

50k Hz

LPF

50k Hz

FE signal generation circuit

Fbal coarse adjustment value

DV5U Chip

G=0dB

Selector

DV5U Chip

AMP

Buffer AMP ADC drive AMP

Gain switching

3dB, 9dB

Gain switching 6/7.5/9/10.5/ 12/13.5/15/

16.5/18/19.5d

ADCSelector

ADC

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After 10bit ADC

CN1101

F+H_G+H

E+G_E+F

112

111

E+G_E+F

F+H_G+H

Gain switching

-6dB, 0dB,

LPF

50k Hz

LPFInput AMP

G=0dB

Buffer

LPF

50k Hz

Buffer AMP

Gain switching 3dB, 9dB

Gain switching 6/7.5/9/10.5/ 12/13.5/15/

16.5/18/19.5d

ADCSelector

Selector

ADC

AMP

DV5U Chip

TE signal generation circuit

1+Ptbal0,1/0x0100

1-Ptbal0,1/0x0100

Offset cancel

Tbal adjustment value

AMP

DV5U Chip

0.1uF

TE signal generation circuit

0.1uF

CN1101

LPF

Gain switching G=0,3,6,9,12,15dB

HPF

LPF

11.3M

/5.7M Hz

LPF

11.3M

/5.7M Hz

LPF

11.3M

/5.7M Hz

LPF

11.3M

/5.7M Hz

HPF

1MHz/2.5MHz/through

HPF

1MHz/2.5MHz/through

HPF

1MHz/2.5MHz/through

HPF

1MHz/2.5MHz/through

100

VIN3RF

VIN1RF

VIN4RF

VIN2RF

Gain switching

-6dB, 0dB, 3.5dB

Input AMP

CMP

DAC

CMP

DAC

DAC control

filter

DAC control

filter

DAC control

filter

DAC control

filter

Phase comparator

Phase

comparator

LPF (integrator)

AMP

F+H_G+H

E+G_E+F

1.1.3 TE generation circuit

• DVD (phase difference TE)

• CD (3-beam TE)

Tracking error (TE) generation circuit In case of DVD, the phase difference method is used for generating TE and TE is generated from the phase difference between (A+C) and (B+D). In case of CD, the AD conversion is carried out using 3-beam method after inserting it in the variable amplifier, and TE is generated based on the formula TE=(F+H_G+H)-(E+G_E+F).

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1.2 Servo block (MN2DS0018MAUB : IC1501)

The servo block carries out the servo control for focus, tracking, traverse, the control of spindle motor and seeking control.

1.2.1 Focus close

After the focus close command is issued, both of DVD and CD carry out the following processing.

1. Measurement and optimization of signal level

First, the lens of PU is driven in the direction vanishing from the disc, and next, it is driven in the direction coming close to the disc. Each signal level of FE, AS and RFENV is measured at the focusing point passing through this time, and for FE and AS, the level is optimized (1, 2 in the figure).

2. Focus leading-in

Next, the lens is driven in the direction vanishing from the disc and the leading-in level of FE and AS is detected, and then the focus loop filter is actuated and the focus is drawn (3 to 6).

3. Leading-in check

The leading-in is checked at AS and RFENV signal levels (6, 7). With the focus search in the test mode, the signal level of FE, AS, RFENV and the focus drive voltage can be checked.

1.2.2 Tracking close After the tracking close command is issued, both of DVD and CD carry out the following processing.

1. Tracking brake

A half cycle of the track cross is measured and if the cycle is within the specified range, the brake pulse is output. The output direction of the brake pulse is decided by the phase relationship between OFTR and TKC (signal that binarizes TE) signals. If the fact that the oscillation of lens to the disc is controlled is checked, the brake is terminated and the operation shifts to leading-in. If the leading-in condition is not realized within 10msec after the brake is output, the brake is terminated and the operation shifts to leading-in.

2. Tracking leading-in

The tracking drive hold processing by OFTR signal is carried out.

3. Leading-in check

Whether the number of track jumps within the specified period is within the specified number is checked. The leading-in check becomes time-out in 8.4msec and the retry is carried out by the command from the microcomputer.

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With this system, three methods; interval jump, multi-jump, and traverse seeking are selected according to the target track number.

1. Interval jump The detailed seeking can be carried out in order to execute the track jump for 1 track repeatedly and it is used when coming close to the target track or for seeking operation for the neighboring track.

2. Multi-jump The both edges of track cross signal TKC are counted and the track counting movement of specified number of tracks is carried out. The stepping motor is driven according to the number of jumps.

3. Traverse seeking The stepping motor is controlled by F/W. The track counting by TKC is not carried out, but the stepping motor is moved according to the number of jumps. In case of DVD, the seeking is carried out using the middle point servo by microcomputer while keeping the pickup to the middle point.

The jump switching setting common to DVD and CD is shown below Number of target movements, type of jump

1.2.3 Track jump

DVD 1~10 Interval jump 11~500 Multi-jump 501~878 Combination of multi-jump and interval jump 879~1756 Traverse seeking (short) 1757~ Traverse seeking (long)

CD 1~10 Interval jump 11~400 Multi-jump 401~780 Combination of multi-jump and interval jump 781~928 Traverse seeking (short) 929~ Traverse seeking (long) The waveform of the track jump is shown on the next page.

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Interval jump (1 track) DVD

Multi-jump (32 track) DVD

Inner circumference jumOuter circumference jump

Inner circumference jumpOuter circumference jump

Traverse seeking (900 track) A± and B± are measured by setting LPF of oscilloscope to 10 kHz

Inner circumference jumpOuter circumference jump

A±

B±

Traverse seeking (1000 track)

Inner circumference jumpOuter circumference jump

A±

B±

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The focus jump is the function corresponding to two layers on one surface or two layers on both surfaces. The nearest layer and the back layer seen from the object lens are called layer 0 (L0) and layer 1 (L1), respectively.

The flow of the focus jump is shown below.

1. The tracking is opened on the layer that is being played.

2. A command is issued and the jump to the target layer is executed.

3. On the layer after the jump, the tracking is closed and the play is restarted.

The processing when the jump command is issued is shown below.

1. The lens is accelerated to the target layer until the FE signal detects the focus jump acceleration termination level. However, the acceleration timeout time passes before the acceleration termination level is detected, the acceleration is forcibly terminated.

2. The drive voltage is not output and the lens is moved through inertia until the FE signal detects the deceleration start level.

3. The lens is decelerated until the deceleration termination level is detected after the deceleration start level is detected. However, if the deceleration timeout time passes before the deceleration termination level is detected, the deceleration is forcibly terminated.

1.2.4 Focus jump

object lens

The waveform of the focus jump is shown below.

Focus jump waveform

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1.3 Automatic adjustment function

With this system, the circuit adjustment is fully automated. The content of each automatic adjustment is described below.

1.3.1 VIN1, VIN2, VIN3, VIN4, VIN7, VIN8, VIN9, and VIN10 offset cancels Each signal of VIN1 to 4, VIN7 to 10 output from PU is converted to the digital signal by AD converter in the servo block. The offset cancel is the function for cancelling the input offset of AD converter when the power is turned ON.

1.3.2 VCO gain adjustment (VARI adjustment) This system is equipped with the function for absorbing VCO gain variation between LSI individuals by learning and making an automatic adjustment so that VCO gain becomes constant. VCO is locked to the standard frequency for learning. The frequency controlling value (FCNT) is read and VARI register is adjusted so that this value becomes equivalent to the target FCNT value.

1.3.3 FE normalization adjustment The FE signal level measured when the focus is closed is adjusted to become 190LSB at the digital equalizer input stage

1.3.4 Focus balance (FBAL) adjustment When the focus is closed, tracking is opened, and the tracking is closed, the focus position is adjusted so that the RFENV is maximized.

1.3.5 DPD amplitude adjustment The gain at the analog stage is adjusted so that the input signal of DPD comparator of DVD's TE generation circuit becomes constant.

1.3.6 Tracking error amplitude learning When the focus is closed and the tracking is opened, the lens is oscillated in the direction of track and the amplitude level of TE is adjusted so that it becomes 190LSB at the digital equalizer input stage.

1.3.7 Tracking balance (TBAL) adjustment When the focus is closed and the tracking is opened, the lens is oscillated in the direction of track and the balance point where the DC offset becomes zero is found using Newton-Raphson method and an adjustment is made.

1.3.8 OFTR adjustment For the binarization of OFTR signal, the binarization threshold level is adjusted.

1.3.9 AS normalization adjustment When the tracking is closed, the AS signal level is measured by the number of specified samplings and A/D is carried out by ADSC, and then the accurate adjustment is carried out so that it becomes 64LSB at the digital equalizer input stage.

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List of automatic adjustment coefficient

1.4 CIRC block (MN2DS0018MAUB : IC1501)

CIRC block has the digital signal processing function (EFM demodulation and error correction) of CD-DA and CD-ROM and the digital servo processing function of the spindle motor built-in.

1.5 DRC block (MN2DS0018MAUB : IC1501)

The digital read channel (DRC) is equipped with A/D converter, digital equalizer (DEQ), adaptive equalizer, Viterbi detector, digital PLL circuit, RISC interface, and peripheral circuit for reading the signals of optical disc.

Note) The coefficient value is displayed in hexadecimal notation. The standard in the production line (when PP is

generated) is described for every item. Concerning the disc, TDV-582 and TCD-792 are used for DVD and CD, respectively.

1.3.10 Focus gain adjustment, tracking gain adjustment When the tracking is closed, the disturbance is implanted in the servo loop and it is adjusted to the target gain intersection point.

For all automatic adjustments, the adjustment result can be checked by displaying it in the test mode

Status coefficient DVD CD

Power ON

VIN1 offset 1600 ~ 2400 -

VIN2 offset 1600 ~ 2400 -

VIN3 offset 1600 ~ 2400 -

VIN4 offset 1600 ~ 2400 -

VIN7 offset 1700 ~ 2400 <-

VIN8 offset 1700 ~ 2400 <-

VIN9 offset - 1700 ~ 2400

VIN10 offset - 1700 ~ 2400

F close

FEPP (FEMAX-FEMIN) 1B1F ~ 717C 2A58 ~ B173

AS MAX No standard <-

FE normalization No standard <-

F close (after TBAL)

TEPP (TEMAX-TEMIN) 36B0 ~ 80E8 E42 ~ 6BCD

TE normalization No standard <-

T close

F gain 0100 ~ 0507 0100 ~ 0400

T gain 0100 ~ 0400 <-

AS normalization No standard <-

CX-3268

+ 22 hidden pages

Pioneer CX-3268 Service manual

- 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.

CONTENTS

1. CIRCUIT DESCRIPTIONS