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Service
Manual
MD MECHANISM MODULE
CX-683
NOTE:
- This Service Manual describes the operations of the MD mechanism module being used for the models
listed in the Table indicated below.
- Be sure to reference this service manual as well as the service manual prepared for respective models
must be referenced before implementing the repair work.
MODEL
MEH-P5100R/EW
CONTENTS
1. CIRCUIT DESCRIPTIONS ...........................................2
2. MECHANISM DESCRIPTIONS.................................12
3. DISASSEMBLY .........................................................15
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
CRT2445
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
ORDER NO.
CRT2441
MD MECHANISM MODULE
CXK3110
K-FZU. JAN. 2000 Printed in Japan
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Summary of Contents for Pioneer CX-683
- 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-FZU. JAN. 2000 Printed in Japan...
- Page 2 CX-683 1. CIRCUIT DESCRIPTIONS 1.1 RF AMPLIFIER BLOCK (CXA2523AR : IC101) This section works to process the output signals from the MD pickup to generate signals to be transferred to the next stage, namely, the DSP section (IC201). Respective photo-detector output signals A, B, C, D, E and F are I-V converted and processed inside the RF amplifier to become FE, TE and ADIP signals.
- Page 3 CX-683 1) APC (Automatic Power Control) Circuit Since laser diode (LD) has temperature characteristics, the APC circuit is provided to control current flow using the monitor diode so that the output may be kept at a constant level. LD current is determined by measuring voltage across V1 and 3VD.
- Page 4 CX-683 3) I-V, ADIP, ABCD and FE Amplifier Blocks They are used for I-V conversion of photo-detector signals (A to F pins) from the pickup. ADIP, FE and full quantity of light signals are generated from A to D signals, and TE signal is generated from E and F signals.
- Page 5 CX-683 4) TE and SE Amplifiers Side spot E and F signals are I-V converted, then entered to the EF balance adjusting amplifier. Then, after polarity of the tracking error signal is switched by the TE differential amplifier (TESW), the signal is conducted to the gain amplifier to generate TE signal.
- Page 6 CX-683 1.2 SIGNAL PROCESSOR BLOCK (CXD2655BR IC201) 1.2.1 SERVO BLOCK 1) Servo Block This block offers servo control over the focus, tracking, spindle and carriage. FE, TE and SE signals from the amplifier are A/D converted, equalized on D.F (digital filer) block, and then output to PWM.
- Page 7 CX-683 Tracking Servo System The system causes the microcomputer to issue the tracking close instruction to the IC, then switches the spindle control from the ofst drive to the CLV control. The close operation completes when the Disc address has been read after the spindle LOCK signal went high (Can be monitored on the mnt0 terminal when the mnt selector is set to 00).
- Page 8 CX-683 Track Jump Track jumps of 1T, 10T, 16T, 32T and fine search (up to 255T) are available thanks to the auto sequence function of LSI. (Other jumps are also available in the test mode, but users are advised not to try them.) Multiple TRK_rew jump (fwd is reversed-inversion.)
- Page 9 CX-683 **** You can display and check results of the adjustment from the test mode (display in hexadecimal, 2’s complement) "7F~0,FF~80" Conversion from hex to decimal ↓ Hexadecimal "127~0,-1~-128" Decimal 1) OFST adjustment Reference 00 (h) ⇒ Example 02 = VC 2*13mV = +26mV Result of the VC offset adjustment is +26mV, thus the circuit offset must be -26mV.
- Page 10 CX-683 1.3 POWER SUPPLY AND DRIVER BLOCK (BA5985FM: IC401) 1) Power supply Switched system power supplies MDVD and PVD (8.3V) from the mother board and backup system power supply VDD (5V) are used for this system (see the power supply system diagram).
- Page 11 CX-683 1.4 SCHEMATIC FLOW DIAGRAM FOR THE MODULE POWER (TEMPERATURE DETECTION) UPC2933T MDVD VD system 3.3V * typ40mA system 8.3V REG. 8.3 ± 0.5V Output voltage 3.3 ± 0.16V CXA2523AR VDsense 1.3A with built-in excess High : 9.9V RF·Amp current protector Low : 3.5V...
- Page 12 CX-683 2. MECHANISM DESCRIPTIONS 2.1 CARTRIDGE LOADING OPERATION The load switch is provided in front of the cartridge transfer rubber roller. The load switch is turned on after the cartridge is inserted. Turning this switch on will start rotation of the loading motor-driven rubber roller and, as the result, transfer of the cartridge is initiated.
- Page 13 CX-683 2.2 CLAMPING OPERATION The cartridge being transferred by the rubber roller pushes the resin lever shown in the figure. When pushed, the spur gear on the resin lever (they are molded integral) is engaged with the rotating gear, thereby moving the sheet metal lever fitted to the resin gear.
- Page 14 CX-683 Cartridge holder is driven to the clamping position by move of the sheet metal lever. Left side fitting pin of the cartridge holder. An internal view of the machine in the clamping operation. Arm for synchronizing the move of the left and right side sheet metal levers.
- Page 15 CX-683 3. DISASSEMBLY - Removing the PU Unit 1. Provide short solder in section A, then remove the connector. 2. Remove the two screws, then erect the board in the direction indicated by the white arrow head. 3. Remove the two screws and two springs.
- Page 16 CX-683 - Removing the Carriage Motor (2/2) 1. Remove the screw, then remove the Holder. 2. Remove the screw, remove the flat spring situated in the position indicated by the black arrow head, then drive out the Carriage Motor through the direction indicated by the white arrow head.