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Pioneer CX-977 Service Manual
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Pioneer CX-977 Service Manual

Pioneer CX-977 Service Manual

Cd mechanism module
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Service
Manual
CD MECHANISM MODULE
CX-977
- This service manual describes the operation of the CD 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
DEH-P630/X1N/UC
DEH-P7300R/X1N/EW
DEH-P730/X1N/UC
DEH-P7350/X1N/ES
PIONEER CORPORATION
PIONEER ELECTRONICS SERVICE INC.
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 2001
Service Manual
CRT2648
CRT2649
CRT2650
CRT2651
CONTENTS
1. CIRCUIT DESCRIPTIONS ...........................................2
2. MECHANISM DESCRIPTIONS.................................26
3. DISASSEMBLY .........................................................28
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
CD Mechanism Module
CXK5500
K-ZZA. MAR. 2001 Printed in Japan
ORDER NO.
CRT2624

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Summary of Contents for Pioneer CX-977

  • Page 1 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 2001 K-ZZA. MAR. 2001 Printed in Japan...

  • Page 2: Circuit Descriptions

    CX-977 1. CIRCUIT DESCRIPTIONS From divisional viewpoint, the CX-977 is roughly divided into four sections, namely, Preamplifier, Servo, Power Supply and Loading Control. This LSI realizes eight types of automatic adjustments (controls) through cooperative work between Preamplifier and Servo unit.
  • Page 3 CX-977 1) Focus Error Amplifier unit In this sub-unit, outputs from the photo detector, namely, (A+C) and (B+D), are processed in the differential amplifier and further in the error amplifier, and then, (A+C-B-D) is output as FE signal from #16 pin of IC101 (TA2153FN).
  • Page 4 CX-977 3) RF Amplifier unit Outputs from the photo detector, namely, (A+C) and (B+D), are added up, amplified and equalized in the Head Amplifier LSI (TA2153FN). The processed-signals are output to RFI terminal as RF signals (These signals are used to check eye patterns).
  • Page 5 CX-977 Fig. 5: RFRP and RFCT circuit 5) SBAD Signal Circuit unit In this unit, outputs from the photo detector, namely, E and F are processed through the addition amplifier. That is, E and F are added together and (E+F) signal is output from #15 pin of IC101 (TA2153FN), as SBAD signal.
  • Page 6 CX-977 6) APC Circuit unit If a laser diode is driven at constant current, its optical output comes to have high level negative-characteristics, and this may cause it out-of-control drive because of the heat. So, driving current must be controlled, through use of a monitoring diode, so that optical output remains within the specific degree.
  • Page 7 CX-977 1.2 SERVO DSP (TC9495F2; IC201) 1) Focus Servo system The main equalizer of the Tracking Servo is comprised with a digital equalizer unit. Fig. 8 shows the block diagram of the Tracking Servo. Fig. 8: Block diagram of Focus Servo circuit...
  • Page 8 CX-977 A series of actions of detecting in-focus point and switching on the Focus Servo upon such detection are called "focus search." In Focus Servo system, the system needs to move the lens to in-focus point so that it performs "Focus Close."...
  • Page 9 CX-977 Fig. 9: Focus Search Timing The microcomputer monitors FOON signal while the system is performing focus search, and starts monitoring of FOK signal from the point when 40 ms has passed after FOON signal became active (The signal is active when the condition is "Servo ON."...
  • Page 10 Sequence function that the LSI has in it. The CX-977 has two types of track jump as those used for searching. Namely, the "Lens Kick" mode used for 1, 4, 10, 32 and 100 track, and the "Carriage Move" mode used for jumping of more than 1,000 tracks. Under Test mode, you can use, to check the track position, 1, 32 and 100 jump as Lens Kick jump and Carriage Move jump according to mode selection.
  • Page 11 CX-977 Fig. 11: Lens Kick...
  • Page 12 CX-977 • Carriage Move jump A Carriage Move jump is performed when the LSI receives a Carriage Move command from the microcomputer. Direction of move and number of tracks are specified by the command. When the LSI receives a Carriage Move command, it makes the Tracking Servo "Open,"...
  • Page 13 CX-977 • Hysteresis operations In certain operation, such as Setup or jump, servo-feed tends to be deteriorated during operations. Hysteresis is the operation to keep stable feed to servo-loop under such conditions. It acts in such manner that it holds a TE signal when each beam spot comes to off-track position, so that convergence of the Tracking Servo can be improved.
  • Page 14 CX-977 3) Carriage Servo system The Carriage Servo inputs low-frequency-component output (lens position information) of the tracking equalizer into the carriage equalizer, then, after it has earned certain amount of gain, it outputs a drive signals from the LSI. Further, such drive signals are applied to the carriage motor via the driver.
  • Page 15 CX-977 Fig. 15: Carriage signal waveform 4) Spindle Servo system Fig.16 shows the block diagram of the Spindle Servo. Fig. 16: Block diagram of the Spindle Servo circuit...
  • Page 16 CX-977 Spindle Servo has the following modes • CLV Servo mode This is the mode the system uses for such span as "after Focus Close and before it applies brake to the motor to stop the disk." Before Tracking Close and during normal Play, the system operates under this mode.
  • Page 17 1.3 AUTOMATIC ADJUSTMENT FUNCTION In this CX-977 system, all circuit adjustments are automatically performed in CD-LSI (IC201: TC9495F2). Adjustments are automatically performed every time a disk is inserted into the unit, or a CD mode is selected through the Source Key.
  • Page 18 CX-977 Servo Reference level is set as follows. In case offset adjustment is made, the level is set to: The level of TEI input (i.e. TF offset level) at "Servo = OFF." In case offset adjustment is not made, the level is equal to: Vref level.
  • Page 19 CX-977 3) Focus/Tracking AGC This is the control that automatically adjusts servo loop gain of the Focus Servo and Tracking Servo. The adjustment is performed in the following manner. (1) The system (microcomputer) injects a disturbance into servo loop. (2) Then, caused by such injection, error signals (FE and TE) are generated, and the system samples such error signals through BPF.
  • Page 20 CX-977 As to this FE Bias automatic adjustment, as similar to cases of automatic gain control, the system repeats a series of adjustments several times to maximize accuracy of adjustments. Fig. 20: FE Bias adjustment 5) RF Level automatic adjustment (RFAGC)
  • Page 21 CX-977 These adjustments are performed in the following timing. Just before the completion of Setup (i.e. just before "Play") After restoration of correct focus, in case focus point comes to out of focus. Fig. 21: RF level adjustment 6) Gain adjustment at Preamplifier-Stage This adjustment increases the gain of entire RFAMP (FE, TE and RE amp.) by +13 dB through the specific setting on...
  • Page 22 1.4 POWER SUPPLY AND LOADING CONTROL SECTION CX-977 uses power sources of two systems. One is the VD (8.3 ± 0.5V) supplied by the motherboard. This system of power source ("Drive system" power source) is supplied to the 4-CH CD Driver IC and the 5V Regulator IC. The second is V+5 power source ("Control system"...
  • Page 23 CX-977 Fig. 22: Block diagram of circuits in Power supply/Loading system CLCONT Loading Mode Carriage Mode Loading Mode Fig. 23: Switching of LOADING/CARRIAGE mode...
  • Page 24 CX-977 LOAD/EJECT actions are controlled through condition-changes of four switches, namely, the Clamp switch on the mechanical unit and three switches on the Control unit (Combination of ON/OFF conditions of each one of these 4 switches is called "status" as a whole). That is, DSCSNS voltage changes according to ON/OFF conditions of these switches, and controls are performed through such change of voltage.
  • Page 25 CX-977 LOAD EJECTION OPERATING STATUS TRANSITION DIAGRAM LOADING 12cm CLCONT LOEJ MOTOR STOP LOAD STOP 12cm RECOGNITION CHECK LOAD/CARRIAGE SWITCHING A or B CLCONT LOEJ MOTOR STOP LOAD STOP 8cm RECOGNITION CHECK DEAD ZONE LOAD/CARRIAGE SWITCHING EJECT 12cm CLCONT LOEJ...

  • Page 26: Mechanism Descriptions

    CX-977 2. MECHANISM DESCRIPTIONS - Loading actions 1. When a disk is inserted, SW Arm L and R rotate. Due to the rotation of Arm L, SW1 is switched from ON to OFF and the Load Carriage Motor starts. 2. If the disk is 12cm-disk, when it is carried to the position shown with the dotted line in the drawing, SW 3 switches to ON due to such rotation of Arm L.
  • Page 27 CX-977 - Clamp actions 1. When centering of 12 or 8cm-disk onto the Spindle is completed, the Detection Arm starts driving. 2. Then, the Detection Arm, via the Detection Reversion Arm, triggers driving of the Plunging Rack, which is on the Mode Switching Arm unit, in order to engage the rack with the 2-Stage Gear.
  • Page 28 CX-977 3. DISASSEMBLY - How to hold the Mechanical Unit 1. Hold the top and bottom frame. 2. Do not squeeze top frame's front portion too tight, because it is fragile. Do not squeeze. - How to remove the Top and Bottom Frame 1.
  • Page 29 CX-977 - How to remove the Control Unit 1. Give jumper-solder treatment to the Flexible Wire of Jumper-Solder the Pickup unit, then remove the wire from the Connector. Control Unit 2. Remove all 4 points of solder-treatment on the Lead Wire.
  • Page 30 CX-977 - How to remove the Load Carriage Motor Assy 1. Unscrew the screw (1 piece). 2. Remove the Load Carriage Motor Assy. Load Carriage Motor Assy Grease Application - How to remove the Clamp Arm Assy Clamp-Up Lever 1. Unlock springs (3 pieces).