Pioneer CX-3250 Service manual

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 2009

CRT4300

DVD MECHANISM MODULE(LS1)

CX-3250

- 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

DVH-P4100UB/XN/EW5 CRT4256 CXK6800

DVH-P4100UB/XN/UW5

DVH-P4150UB/XN/RC CRT4282 CXK6800

DVH-P4150UB/XN/RD

DVH-P4150UB/XN/RI

DVH-P4190UB/XN/ID

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

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

3. DISASSEMBLY ...............................................................................................................................................22

K-ZZU. JAN. 2009 Printed in Japan

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1. CIRCUIT DESCRIPTIONS

1. Front end section (MN2DS0018MAUB : IC1501)

MN2DS0018MAUB is a 1 chip LSI for DVD-Player. A DVD-Player system can be constructed by connecting this LSI, driver IC, SDRAM, Flash-ROM, Audio-DAC, etc. This LSI includes a front end (SODC/FE) which executes RF signal processing, servo processing and decode processing, a AV decoder(back end/BE) which executes video decode processing such as MPEG1/MPEG2/JPEG and audio decode processing such as DVD-Audio/Dolby Digital /DTS/MP3, and a system controller which controls the system. The front end section realizes optical head signal computation processing and RF signal processing, digital signal processing (16-8 demodulation, error correction) for DVD-ROM playback according to the DVD specifications, digital signal processing of CD-DA/CD-ROM (error correction), AV decoder transfer, servo control, spindle motor control and seek control. In the case of MN2DS0018MAUB, the front end servo system waveforms, such as FE, TE and AS, are not observed as in the case of DVD mechanism module (MS5) CX-3212. Please pay attention.

1.1 Analog block (MN2DS0018MAUB : IC1501)

The functions of the analog block are as described below.

1. Reference power circuit

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

3. RF signal processing circuit RF adding circuit, circuit to make inline, Variable Gain Amplifier (VGA) circuit

4. Laser power control (LPC) circuit

5. A/D converter for SERVO (10 bit, DPD system-4ch),DPD converter, PWM

1.1.1 APC circuit

The optical output of the laser diode (LD) has a large negative temperature characteristic. Therefore, if the LD is driven by a constant current, a constant optical output cannot be obtained. APC circuit is a circuit to control the current so that the output at the monitor diode (MD) will be constant. MN2DS0016AAUB includes 2 types of APC circuit, one for DVD and the other for CD. The LD current can be obtained by dividing the measured voltage between DVDLD1 (CDLD1) and 5 V by 6 Ω (1.5 Ω x 4=6 Ω), in the case of DVD (CD). It will be approximately 50 mA (45 mA) in the case of DVD (CD). The potential difference between DVDLD1(CDLD1) and 5 V is set to approx. 300 mV(270 mV).

DV5U Chip

(MN2DS0018MAUB : IC1501)

CDMPD

DVDMPD

PU UNIT

106

105

104

103

CX-3250

5 678

ADC

ADC driving AMP

Buffer AMP

Selector

ADC

Selector

Gain switching

6/7.5/9/10.5/

12/13.5/15/

16.5/17/19.5 dB

Gain switching

3 dB, 9 dB

DV5U Chip

AMP

Gain switching

G=0 dB

LPF

50 k/100 kHz

-6 dB, 0 dB, 9.5 dB VIN7

115

FE1

Buffer

LPF

50 k/100 kHz

Input AMP

VIN8

116

FE = (FE1) - (FE2)

The signal from PU, FE1 and FE2, are AD converted inside IC1501 and captured. After that, a differential is obtained by taking the offset cancellation into consideration,

1.1.2 FE forming circuit

and FE is obtained.

Focus error (FE) forming circuit

CN1101

FE2

FE signal forming circuit

1+Pfbal0,1/0x0100

After 10 bit ADC

CX-3250

FE1

DV5U Chip

1-Pfbal0,1/0x0100

Fbal coarse adjustment value

Offset cancel

FE2

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1.1.3 TE forming circuit

Tracking error (TE) forming circuit

In the case of a DVD, the phase difference method is used for TE forming, and the TE is formed from the phase difference among (A+C) and (B+D).

In the case of a CD, 3 beam method is used, and after entering the signal into a variable amplifier, it is AD converted,

and a TE is formed by the equation of TE=(F+H_G+H)-(E+G_E+F).

DVD (phase difference TE)

CN1101

0.1 μF

VIN3RF

VIN1RF

VIN4RF

100

VIN2RF

Gain switching

–7.5 dB, 0 dB, 3.5 dB

LPF

11.3 M /5.7 MHz

Input AMP LPF

LPF

11.3 M /5.7 MHz

LPF

11.3 M /5.7 MHz

LPF

11.3 M /5.7 MHz

Buffer

Gain switching

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

HPF

DAC control

Filter

1 MHz/25 MHz

/Through

HPF

1 MHz/25 MHz

/Through

HPF

1 MHz/25 MHz

/Through

HPF

1 MHz/25 MHz

/Through

G=-1 dB

ADCAMP

DV5 Chip

Phase comparator

Phase

comparator

LPF (integrator)

TE signal forming circuit

AMP

DAC

DAC control

Filter

DAC

DAC control

Filter

DAC

DAC control

Filter

DAC

CX-3250

5 678

ADCSelector

AMP

Buffer AMP

Buffer

LPF

50 kHz

Selector ADC

G=0 dB

Gain switching

6/7.5/9/10.5/

12/13.5/15/

16.5/18/19.5 dB

Gain switching

3 dB, 9 dB

DV5U Chip

LPF

50 kHz

AMP

TE signal forming circuit

1+Ptbal0,1/0x0100

DV5U Chip

1-Ptbal0,1/0x0100

Input AMP

VIN9

CD (3 beam TE)

CN1101

112

F+H_G+

Gain switching

-6 dB, 0 dB, 9.5 dB VIN10

111

E+G_E+F

After 10 bit ADC

F+H_G+H

CX-3250

Offset cancel Tbal adjustment value

E+G_E+F

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1.2 Servo block (MN2DS0018MAUB : IC1501)

At the servo block, focusing, tracking, servo control of traverse, spindle motor control and seek control are performed.

1.2.1 Focus close

After issuing the focus close command, both the DVD and the CD will perform the following processing.

1. Measurement and optimization of the signal level. First the PU lens is driven in the direction getting away from the disc, then it is driven in the direction getting close to the disc. At this time, each signal level of FE, AS and RFENV are measured at the focused focal point that the lens passes, and the levels of FE and AS are optimized. (1 and 2 in the figure)

2. Focus adjustment Next, after detecting the drawing level of FE and AS by driving the lens away from the disc, the focus loop filter is activated and the focus is drawn. (3~6)

3. Confirmation of adjustment Confirm the drawing at the signal level of AS and RFENV. (6, 7) The signal levels of FE, AS and RFENV and the focus drive voltage can be checked by the focus search in the test mode.

1.2.2 Tracking close

After issuing the tracking close command, both the DVD and the CD will perform the following processing.

1. Tracking brake 1/2 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 determined by the phase relationship of the OFTR and the TKC (binary signal of TE) signals. When it is confirmed that the swinging of the lens against the disc has been controlled, braking will be stopped and enters into drawing. If the drawing conditions are not met within 10 msec, after the brake output, the brake will be ended and entered into drawing.

2. Tracking adjustment Tracking drive hold processing by the OFTR signal will be performed.

3. Confirmation of adjustment Checking is made that the number of track jumps within the specified period of time are at the designated numbers or less. The time out for confirmation of adjustment is 8.4 msec. and retry is performed by the command from the microcomputer.

Close to disc.

Lens

Late

Merging point

CX-3250

5 678

1.2.3 Track jump

In this system, one of the three methods, interval jump, multi jump or traverse seek, is selected depending on the number of target moving tracks.

1. Interval jump Detailed seek can be performed to execute repeated track jump of 1 track, and it is used when the target track gets close or at the time of seek operation to the adjacent track.

2. Multi jump Both edges of the track cross signal TKC are counted, and track count move of the designated number is executed. Furthermore, the CRG motor is driven according to the number of jumps.

3. Traverse seek Track count by TKC is performed, and I control movement speed and seek it. I minimize vibration of PU occurring for movement. It indicates the setting for jump switching common to DVD and CD. Types of target move number of jumps.

DVD

~10 Interval jump

~500 Multi jump

~1000 Combination of multi jump and interval jump

501

~ Traverse seek (short)

1001

Tracking-on process

~10 Interval jump

~100 Multi jump

~500 Combination of multi jump and interval jump

101

~ Traverse seek (short)

501 The waveform of track jump is shown on the next page.

CX-3250

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Interval jump (1 track) DVD

Outer peripheral jump Inner peripheral jump

Multi jump (32 track) DVD

Outer peripheral jump Inner peripheral jump

Traverse seek (1001 tracks) DVD

Outer peripheral jump Inner peripheral jump

Traverse seek (10 000 tracks)

Outer peripheral jump Inner peripheral jump

COP-COM

CX-3250

5 678

1.2.4 Focus jump

Focus jump is a function compatible to 2 layers on one side or 2 layers on both sides. Looking from the object lens, the layer close to the lens is called “layer 0” (L0) and the layer away from the lens is called “layer 1” (L1).

1.3 Auto adjustment function

All circuit adjustments are automated in this system. Details of each auto adjustment are explained below.

1.3.1 VIN7, VIN8, VIN9, VIN10 offset cancel

Each signal from VIN7,8, 9 and 10 output by PU is converted to a digital signal by the AD converter in the servo block. Offset cancel is a function to cancel input offset of the AD converter at the time of power ON.

1.3.2 VCO gain adjustment (VARI adjustment)

It has a function to absorb variation of VCO gain among individual LSI by learning so that auto adjustment is made to maintain the VCO gain at a certain level. VCO is locked against the reference frequency for learning. And, a frequency control value (FCNT) is read, and VARI register is adjusted so that the read value becomes the same as the target FCNT value.

1.3.3 FE normalization adjustment

FE signal level measured at the time of focus close is adjusted so that it will become 190LSB at the digital equalizer input stage.

Object lens

The waveform of the focus jump is shown below.

Focus jump waveform

The flow of the focus jump is shown below.

1. The tracking is opened by the layer being played back.

2. A command is issued to execute jump to the target layer.

3. The tracking is closed at the layer after the jump and the playback is resumed.

Incidentally, the process when the jump command is issued is as described below.

1. The lens is accelerated to the target layer until the FE signal detects the focus jump acceleration end level. Acceleration will be ended by force, however, if the time for acceleration timeout has elapsed before detecting the acceleration end level.

2. The drive voltage is not output until the FE signal detects the speed reduction start level, and the lens is moved by inertia.

3. The lens speed is reduced from detection of the speed reduction start level until detection of the speed reduction end level. Speed reduction will be ended by force, however, if the time for speed reduction timeout has elapsed before detecting the speed reduction end level.

CX-3250

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State

Power ON

F close

F close (after TBAL)

T close

Coefficient VIN7 offset VIN8 offset VIN9 offset

VIN10 offset

FEPP(FEMAX-FEMIN)

AS MAX

FE normalization

TEPP(TEMAX-TEMIN)

TE normalization

F gain T gain

AS normalization

DVD 05FB~0A17 05FB~0A17

1D84~6C08 No standard No standard 2328~59D8 No standard

0100~0400 0100~0400

No standard

0533~0B0C 0533~0B0C

2E18~A8CF

1E91~98D1

Note) Coefficient values are indicated in hexadecimals. In all cases, specifications at the production line are described. For discs, TDV-582 is used for DVD and TCD-792 is used for CD.

1.4 CIRC block (MN2DS0018MAUB : IC1501)

The CIRC block includes the digital signal processing function (EFM modulation and error correction) of CD-DA and CD-ROM and the digital servo processing function of the spindle motor.

1.5 DRC block (MN2DS0018MAUB : IC1501)

The digital read channel (DRC) is equipped with A/D converter, digital equalizer (DEQ), Adaptive filter, Viterbi detector, digital PLL circuit, RISC interface and periphery circuits for reading of signal on optical disc.

The list of auto adjustment coefficient

1.3.4 Focus balance (FBAL) adjustment

The focus position is adjusted so that the RFENV will be the maximum at the time of focus close tracking open and tracking close.

1.3.5 DPD amplitude adjustment

I perform the gain adjustment of the analog step so that the input signal of the DPD comparator of the TE generation circuit of the DVD becomes constant.

1.3.6 Learning of tracking error amplitude

At the time of focus close and tracking open, the lens is oscillated in the track direction and adjusted so that the TE amplitude level becomes 190 LSB at the digital equalizer input stage.

1.3.7 Tracking balance (TBAL) adjustment

At the time of focus close and tracking open, the lens is oscillated in the track direction and the balanced point where the DC offset becomes zero is searched and adjusted by using the Newton-Raphson method.

1.3.8 OFTR adjustment

The binary threshold level is adjusted to make the OFTR signal into a binary digit.

1.3.9 AS normalization adjustment

The AS signal level is measured for the designated number of samples at the time of track closing, and after A/D conversion at the ADSC, it is fine adjusted to become 64 LSB at the digital equalizer input stage.

1.3.10 Focus gain adjustment, tracking gain adjustment

At the time of tracking close, a disturbance is entered into the servo loop to adjust to the target gain intersection.

All auto adjustments can be confirmed by displaying the adjustment result in the test mode.

CX-3250

5 678

1.6 LS1 Power Supply Map

VD8(Driver)

8 V+/-0.4 V

VD8(Reg)

8 V+/-0.4 V

VDD5

5 V+/-0.4 V

1chip Driver(8 V)

5 V Reg(VCC5)

5.0 V +/-0.1 V IC1002 S-1133B50-U5

Photo IC

5 V Reg(AVCC5)

5.0 V +/-0.1 V IC1003 S-1200B50-M5

ADAC

IC1801 PCM1753DBQ

3.3 Reg(VCC33)

3.0 V<--->3.45 V IC1004 NJM2885DL1-33

1.2 DC/DC(VCC12)

1.08 V<---> 1.32 V IC1005 R1232D121B

DVD1chip(3.3 V)

SDRAM

IC1480 K4S641632N-LC75

Flash-ROM 1 (Program)

IC1402 S29AL016J70TFIC10H

Other

DVD1chip(1.2 V)

VD8V

HOST

Power Supply

Mecha inside

Power Supply

Pick Up Unit CGY5000

1chip Driver IC1201 BD8231EFV

DVD LSI IC1501 MN2DS0018MAUB

Supply

Flash-ROM 2 (Data)

IC1401 S29AL016J70TFIC10H

USB Circuit

IC1951 TC7SZU04FU

CX-3250

+ 25 hidden pages

Pioneer CX-3250 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