Pioneer CX-3016 Service manual

Model Service Manual DVD Mechanism Module AVH-P6500DVD/UC CRT3038 CXK6310 DVH-P5000MP/UC CRT3074 CXK6312 AVH-P7500DVD/UC CRT3039 CXK6300

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

PIONEER ELECTRONICS SERVICE 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

C PIONEER CORPORATION 2003

K-ZZU. APR. 2003 Printed in Japan

ORDER NO.

CRT3056

DVD MECHANISM MODULE(MS3)

CX-3016

- 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.

- The DVD mechanism MS3 has VIDEO-type and ROM-type models. This manual covers the operations

for both models.

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

2. MECHANISM DESCRIPTIONS.................................15

3. DISASSEMBLY .........................................................20

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CX-3016

1.1.1 APC circuit

The light output of laser diodes (LD) has largely negative thermal characteristics. If they are driven with a constant current, the laser power level will not be constant. The APC circuit is designed to control the current so that the laser power becomes constant through the monitor diode (MD). The IC AN8703FH contains two APC circuits, one for DVDs and the other for CDs. The LD current values for DVDs can be calculated by dividing the voltage between the DVDLD1 (or CDLD1 for CDs) and 5V line by 15.6 ohms (3.9 ohms x 4): approximately 26mA and 44mA for DVDs and CDs respectively.

1.Circuit descriptions

1.1 Front-end processor (FEP) section (AN8703FH: IC1101)

The IC1101 generates servo signals for focus and tracking operations, processes the RF signal, and controls the laser power of the pickup. For servo signal processing, the IC contains a focus operational amplifier, a focus balance adjustment circuit, a threebeam tracking operational amplifier, a phase-difference tracking detection circuit, a tracking balance adjustment circuit, and an envelope detection circuit. For the RF signal processing, the AGC and equalizer functions are contained in the IC.

+5V

For CD

For DVD

170mV

180mV

–

– +

LPC02

LPC2

LPC01

+5V

LPC1

3.9Ω 3.9Ω 3.9Ω

3.9Ω

CDLD0

3.9Ω

DVDLD0

CDLD1

DVDLD1

CN1101

78LD

78MD

65LD

65MD

CD LD

+5V

DVD LD

AN8703FH

PU UNIT

CX-3016

1.1.2 Focus error (FE) generating circuit

Focus error (FE) generating circuit

The signals B1 through B4, obtained by dividing the output in the pickup, are applied to the FE generating circuit. Inside the circuit, the (B1 + B3) and (B2 + B4) signals are generated via the internal resistors, fed into the variable amplifier for the focus balance adjustment, and finally the FE signal is generated by amplifying the {(B1 + B3) – (B2 + B4)} signal.

The pin numbers and names in the brackets are for CDs. The circuits for CDs and DVDs are identical, except for the input terminals of the signals B1 through B4.

CN1101

21 FEN

FEY FEX FE

117 AD0

22 FEOUT

VHALF

MNZS26EDCUB

57 VIN1

(49 VIN5)

58 VIN2

(50 VIN6)

59 VIN3

(51 VIN7)

60 VIN4

(52 VIN8)

AN8702 FH

G4 1+f

G4 1–f

–

Control

FBAL7

–

VHALF

1.65V

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CX-3016

1.1.3 Tracking error (TE) generating circuit

• CD (three-beam TE)

Tracking error (TE) generating circuit

For DVDs, the TE signal is generated by utilizing the phase difference between the (B2 + B4) and (B1 + B3) signals (the phase difference method). For CDs, the A and C signals are applied to the TE generating circuit via the external resistors. Inside the circuit the signals are fed to the variable amplifier for the tracking balance adjustment, and finally the TE signal is obtained by amplifying the (A – C) signal (the three-beam method).

· DVD (phase difference TE)

CN1101

VIN12

VIN11

AN8703FH

TBAL

TEOUT

TEY TEX TE

118 ADI

TBAL

TEN

VHALF

MNZS26EDCUB

VIN1 15

VIN2 13

VIN3

VIN4

TBAL

AN8703FH

Differential Phase Det.

TBAL

TEOUT

TEN

VHALF

118 ADI

TEY TEX TE

MNZS26EDCUB

CX-3016

After a focus close command is issued, the following procedures are performed irrespective of DVDs and CDs:

1. Measuring and optimizing the signal levels The pickup lens initially moves away from the disc, and then toward the disc. When the pickup lens passes the focal

point, the FE, AS and RFENV signal levels are measured to optimize the FE and AS signal levels (1 and 2 shown in the above diagram).

Near the disk

Away from the disk

Lens

VHALF

Focal point

RFENV

1.2 Optical disc controller (SODC) section (MNZS26EDCUB: IC1301)

The IC1301, an optical disc controller (SODC) for DVD-ROM/DVD players, is one of a signal processing LSI conforming to the DVD standards. This IC works as a servo controller for the focus, tracking and traverse operations, a spindle motor controller, a seek controller, a digital signal processor for DVD-ROM/RAM reproduction (8/6 demodulation and error correction), and a digital signal processor for CD-ROMs (error correction). In the DSC (Disc Servo Controller) employing an arithmetic processor as a core, analog circuits such as A/D and D/A converters and PLL, and digital circuits including a PWM converter and a cycle timer are contained. In the CIRC, a digital signal processor for CD-DA and CD-ROMs (EFM demodulation and error correction), a spindle motor digital servo processor, and a 1-bit D/A converter with a digital filter (with a secondary low-pass filter, differential OP amplifier output) are prepared. This LSI has easily realized a complete CD/DVD-ROM system.

1.2.1 Focus close

FODRV

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CX-3016

2. Focus closing Next, the pickup lens moves away from the disc to detect the focus closing levels for FE and AS signals. The focus

loop filter operates to close the focus loop (3 through 6 in the above diagram).

3. Verifying focus close completion The focus close completion is verified by observing the AS and RFENV signal levels (6 and 7 in the above diagram).

In the test mode, focus search is used to verify the FE, AS and RFENV signal levels and the focus drive voltage.

1.2.2 Tracking close

After a tracking-close command is issued, the following procedures are performed irrespective of DVDs and CDs:

1. Tracking brake A half cycle of the track-cross (TKC) signal is measured. If the measured cycle falls within the prescribed range, then a brake pulse signal is output. The direction of the brake pulse depends on the relation in phase between the OFTR signal and TKC signal (which is obtained by converting the TE signal into a binary signal). When it is confirmed that the stability in lens operation against the disc has been obtained, the brake pulse output will be terminated, and the operation will proceed to the track-closing mode. If it is not confirmed, the brake pulse output will be terminated 10msec. after the brake pulse signal is output, then the operation will automatically proceed to the track-closing mode.

2. Tracking closing The tracking drive-hold process is performed with the OFTR signal.

3. Verifying tracking close completion The success or failure in tracking close depends on the number of tracks that the pickup crosses within the prescribed period. That is, when the number is the prescribed one or less, the system senses that the tracking close is completed. The time limit for the tracking close verification process is 20msec. The retry operation will be carried out with the command from the microcomputer if the verification has not been completed within the time limit.

1.2.3 Track jump

This system performs track jumps by selecting the following three modes depending on the number of tracks to be skipped: Interval jump, multi jump and traverse jump.

1. Interval jump In this mode, a single-track jump is performed repeatedly. This mode is used for fine seek operation when the pickup has approached the target track or adjacent tracks are targeted.

2. Multi jump

This mode performs the pickup track-count movement by counting both edges of the TKC signal to jump the target number of tracks.

3. Traverse seek

In this mode, the time is measured with the TKC signal to control the pickup speed. During the movement of the pickup, its vibration is minimized.

The track-jump mode settings for DVDs and CDs are shown below:

Target number of tracks Track jump mode 1~10 Interval jump 11~100 Multi jump 101~500 Combination of multi jump and interval jump 501~ Traverse seek

The waveform in each of the track-jump modes is shown in the following pages.

CX-3016

Tracking–on process

Interval jump (one track)

Toward outer tracks Toward inner tracks

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CX-3016

Traverse seek (501 tracks)

Toward outer tracks Toward inner tracks

Multi jump (32 tracks)

Toward outer tracks Toward inner tracks

CO±

Traverse seek (5,000 tracks)

Toward outer tracks Toward inner tracks

CO±

CX-3016

1.2.4 Focus jump

Focus jump is used for single-sided, double-layered or double-sided, double-layered discs. The layer closest to the objective lens is called layer 0 (L0), and the other layer is layer 1 (L1).

Focus jump waveform

L0→L1 L1→L0

The waveforms in the focus jump mode are shown below:

(Layer 1)

(Layer 0)

Objective lens

L0 L1

L1 L0

The focus-jump operation flow is described below:

1. The tracking loop is unlocked on the layer that is being played.

2. A jump command is issued to jump to the targeted layer.

3. The tracking loop closes on the targeted layer and reproduction starts.

The detailed processes after a jump command is issued are as follows:

1. The pickup lens is accelerated towards the target layer until the FE signal detects the focus jump acceleration completion level. If the acceleration timeout occurs before the acceleration completion level is detected, the acceleration is forcibly terminated.

2. No drive voltage is applied until the FE signal detects the deceleration starting level, and the lens is kept moving by the inertia.

3. With the deceleration starting level detected, the lens starts decelerating, and continues it until the deceleration completion level is detected. If the deceleration timeout occurs before the deceleration completion level is detected, the deceleration is forcibly terminated.

+ 19 hidden pages

Pioneer CX-3016 Service manual

CONTENTS

1.Circuit descriptions