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Pioneer CX-692 Service Manual

Dvd/cd mechanism unit
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Service
Manual
DVD/CD MECHANISM UNIT
CX-692
- This service manual describes the operation of the DVD/CD mechanism incorporated in models listed
in the table below.
- When performing repairs use this manual together with the specific manual for model under repair.
Model
XDV-P9/UC,EW,ES/RC,ES/RD
PIONEER CORPORATION
PIONEER ELECTRONICS SERVICE INC.
PIONEER EUROPE N.V.
Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2000
Service Manual
CRT2511
CONTENTS
1. CIRCUIT DESCRIPTIONS ...........................................2
2. DISASSEMBLY .........................................................20
3. MECHANISM DESCRIPTIONS.................................24
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
DVD/CD Mechanism Unit
CXK7010
K-ZZS. MAY 2000 Printed in Japan
ORDER NO.
CRT2533

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Summary of Contents for Pioneer CX-692

  • Page 1 PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A. PIONEER EUROPE N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936 C PIONEER CORPORATION 2000 K-ZZS. MAY 2000 Printed in Japan...

  • Page 2: Circuit Description

    CX-692 1. Circuit Description 1.1 APC circuit APC (Automatic Power Control) circuit [Fig. 1 CD and Fig. 2 DVD] Since the optical output of laser beam diodes carries a transistor, the LD current can be found out and such large negatived temperature characteristic, necessary current value should be within ±20% of the value...
  • Page 3 CX-692 1.2 FOCUS-JUMPING CIRCUIT Focus-jumping function is a function conforming to single side 2-layer discs or double-side 2 layer discs. Fig. 3 below shows the basic movement sequence. Viewing through the objective lens, the layer on this side is called Layer 0 (L0) and the layer on the far side is called the Layer 1 (L1).
  • Page 4 CX-692 Focus-jumping circuit IC401 Normal state IC304 BA6797FM While focus-jumping is in progress Q401 Q402 IC402 NJM2904M Fig. 4 Described below are the explanations of the basic movements. When the focus-jumping command is issued from the mechanism controller (IC501:PD5511A), the input to the...
  • Page 5 CX-692 1.3 FOCUS ERROR AMPLIFIER IC401 IC103 IC105 NJM3404AM Fig. 5 Under normal CD settings: F-GAIN = 0.5dB, FE-GAIN = 3.0dB Under normal DVD settings: F-GAIN = -4.5dB, FE-GAIN = 6.0dB 1.4 TRACKING ERROR SIGNAL GENERATING CIRCUIT Tracking error signals are being formed by amplifying the RFA...
  • Page 6 CX-692 1.5 SERVO SYSTEMS 1.5.1 FOCUSING SERVO SYSTEM The main equalizer for the focusing servo system is When the SBAD stays beyond the SBREF level being provided inside the servo DSP (IC401:TC9461F). continuously for 32mS after focus closing, the servo LSI Fig.
  • Page 7 CX-692 1) Focus searching R=100kΩ Monitor ± C= 0.016µF Relative distance between Focusing point the lens and the disc Near ECR(Reference voltage at 2.5V) 2) Focus closeing STANDBY Normally,focus closing is made at this point Offsetting (Reference voltage at 2.1V)
  • Page 8 CX-692 1.5.2 TRACKING SERVO SYSTEM RF AMP IC103 TA1254AF TE IC IC106,109 P1TN TC7WU04FU IC107 P1TP PA0065AM IC108 NJM3404AM VR21 VR21 VR25 T.BAL CIRCUIT T ACT. SERVO DSP IC401 TC9461F VR21 DRIVER IC304 BA6797FM Fig. 9 The main equalizer for the tracking servo system is being provided inside the TC9461F(IC401).
  • Page 9 CX-692 Lens kick mode jumping track counting is being made in observation of the RFRP The lens kick mode jumping is being executed by the signals. Also, the jumping direction is being detected lens kick command being issued by the phases of the RFRP and the TEZ1.
  • Page 10 CX-692 Feed kick mode jumping Thus, the speed is being lowered just before a jump is The feed kick mode jumping is being executed by the finished to facilitate taking-in action by the servo when feed kick command being issued the jump has been finished.
  • Page 11 CX-692 Regarding the hysteresis movements Outer peripheral direction Inner peripheral direction TE signals RFRP signals TE signals after holding Fig. 12 The hysteresis movement starts when a search is finished (especially, when a feed kicking is finished) and the hysteresis movements work to hold the tracking...
  • Page 12 CX-692 1.5.3 CARRIAGE SERVO outputted from the servo DSP only when the equalizer output level exceeds the threshold level. To drive the carriage servo, the outputs from the The above movement works to suppress the power tracking equalizer will be input into the carriage consumption.
  • Page 13 CX-692 TRACKING DRIVE (LOW FREQUENCY) LENS POSITION DRIVE ON/OFF THRESHOLD CRG DRIVE (INSIDE TC9461F) CRG MOTOR VOLTAGE CRG moved at these point Fig. 14...
  • Page 14 CX-692 1.5.4 SPINDLE SERVO SYSTEM * Spindle lock Spindle lock is a movement to shift from roughing servo to the speed/phase servo. The RLOCK and FLOCK Fig. 15 shows the block diagram of the spindle servo being generated from the demodulator section are system when the DVD is being driven.
  • Page 15 CX-692 DVD SPDL IC701 PD4995A 8cm/12cm spindle gain changeover switch 8cm:OFF , 12cm:ON FPWM IC351 PPWM TC4S66F VPWM RERR IC353(2/2) IC353(1/2) MC33202D MC33202D 1.65V 1.65V Spindle servo changeover switch SPINDLE SPDL MOTOR DRIVER IC301 TC4W53F IC352 1.65V 2.5V MC33202D CD SPDL...
  • Page 16 CX-692 1.5.5 LCD TILT SERVO With the DVD playing back system, since the SKEW margin is narrow, upto ±0.6[DEG.] SKEW will become the playing back range without SKEW compensation. The LCD tilt servo will make it possible to play back upto ±1.0[DEG.] SKEW.
  • Page 17 CX-692 DISC IC401 SERVO DSP PICKUP UNIT TC9461F IC103 B1 - B4 RFRP DETECTOR RF AMP TA1254AF THERMISTOR RFGC data such as of the BUS0 - BUS3 The amplitudes of the CH1 and CH3 are varied TEMP A/DC LCDTLT LCD drive...

  • Page 18: Mechanism Operation

    CX-692 1.6 POWER SUPPLY UNIT CONFIGU- 1.7 MECHANISM OPERATION RATION 1) Elevation Operation The microcomputer determines the present elevation The power supply unit of this system consists of position from the voltage value (EPVO) obtained from EVREF(5V). the potential divider VR301.
  • Page 19 CX-692 3) 0.6mm UP/DOWN Operation In order to secure clearance with the neighboring disc ELV Motor Tray Motor l1,l3 the stage mechanism is driven down by the ELV motor Forward Brake (M4) when clamping is complete. The microcomputer Reverse Stand-by...
  • Page 20 CX-692 2. DISASSEMBLY Precautions when making servicing works DVD/CD mechanism unit 1) Since the upper surface of the arrowed magazine slot in the DVD/CD mechanism unit can be deformed comparatively easily, do not hold this section when making servicing work. (Refer to Fig. 21.) 2) The stage mechanism projects downward beyond the low end of the chassis when it is reset.
  • Page 21 CX-692 Removing the carriage motor assembly 1. Remove the screw A from the PCB. Carriage motor assy 2. Disconnect the leads at the soldered sections. 3. Lifting the PCB paying attention not to cut the PCB, Soldered section unscrew the three screws B to remove the carriage motor assembly.
  • Page 22 CX-692 Removing the spindle motor assembly (Fig. 26,27) 1. Similar to the removal procedures for the tray motor assembly, operate the front lever to move the stage mechanism to the left end marking on the front lever. (This will be the first stage.)
  • Page 23 CX-692 Removing the stage mechanism (Fig. 28) 1. Remove the dual gears. 2. Unscrew the two screws J to remove the rack. 3. Remove the torsion spring from the magazine lock arm. 4. Move the front lever as far as it goes toward the direction where the stage mechanism descends, the front lever and the rear lever will come off altogether.
  • Page 24 CX-692 3. MECHANISM DESCRIPTIONS - Inserting the Magazine 1. Inserting the magazine while countering the spring force of the EJECT lever , the lock arm will slide along the groove on the reverse side of the magazine and lock into place(due to the torsion spring on the reverse side of the lock arm).
  • Page 25 CX-692 - Operation from the Tray Dispenser to the Clamp When the loading motor drives the cam gear, the tray is pulled out by the tray extending arm which moves along the gear cam, and clamping is performed by sliding the clamp lever.
  • Page 26 CX-692 - Stabilizing the Elevation Rattle During clamping, the clamp lever slides and moves the carriage chassis. At the some time, the stopper of the clamp lever enters the stopper of the frame, controlling the up and down motion of the stage section.
  • Page 27 CX-692 - Disc Detection DSP switch(S851) is turned ON and OFF by the DSP switch lever driven by the cam gear which controls the tray extending motion. The photo sensor is timed with this ON and OFF status, detecting the existence and non-existence of the disc as well as the type of disc.
  • Page 28 CX-692 - Over-extension Prevention Structure of the Tray In standby mode the stoppers are maintained in a neutral position by the upper and lower springs. When the tray is being dispensed the stoppers are pushed apart by their tapers. In this condition, even if an impact force is applied and the tray is pushed outward, the tray does not actually get dispensed due to the straight section of the stopper.
  • Page 29 CX-692 - Lubrication points (1) Around the pickup assy -> Use HP-300(Dow Corning) for all points. Carriage motor Gear section Feed screw thread Feed screw tip Feed screw tip Main shaft Pickup Unit Sub guide shaft Fig. 37 (2) Slide section with clamp ball...