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Service
Manual
CD MECHANISM MODULE
CX-961
- 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-P90DAB/EW, 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 2000
Service Manual
CRT2556
CONTENTS
1. CIRCUIT DESCRIPTIONS ...........................................2
2. MECHANISM DESCRIPTIONS.................................15
3. DISASSEMBLY .........................................................17
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
CXK5301
K-ZZA. NOV. 2000 Printed in Japan
ORDER NO.
CRT2503
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Summary of Contents for Pioneer CX-961
- 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 2000 K-ZZA. NOV. 2000 Printed in Japan...
- Page 2 CX-961 1. CIRCUIT DESCRIPTIONS This unit is roughly divided into the preamplifier stage, servo unit, power supply unit and loading control unit. This LSI (large scale integrated circuit) implements eight automatic adjustments according to the combination of the preamplifier stage and servo unit used.
- Page 3 CX-961 1) Focus error amplifier unit This focus error amplifier outputs photodetector output (A + C) or (B + D) from pin 16 of IC201 (TA2150FN) via a differential amplifier and an error amplifier assuming (A + C - B -C) as an FE signal. The low frequency component of voltage FE is expressed as FE = (A + C - B - D) ×...
- Page 4 CX-961 3) RF amplifier unit The head amplifier LSI, TA2150FN, adds, amplifies and equalizes photodetector output (A+C) and (B+D), then outputs RF signal to the RFI pin. (This signal enables checking eye patterns.) Low frequency element contained in RFI voltage is formulated as follows: RFI = (A + B + C + D) ×...
- Page 5 CX-961 4) RFRP and RFCT signal circuit unit The RFCT signal which is the difference signal between the peak and bottom levels of the RF signal is generated through head amplifier (IC201). RFRP and RFCT can be monitored at TP203 (pin 20 of IC201 TA2150FN) and TP204 (pin 22 of IC201) respectively.
- Page 6 CX-961 6) APC circuit section A laser diode’s driving current must be controlled so that optical output could remain constant by using a monitoring diode, because optical output has high negative characteristics that causes a heat hang-up if the laser diode were driven at constant current.
- Page 7 CX-961 The operation of detecting an adjusted focus point and turning on the focus servo is called focus search. In a focus servo system, a lens needs to move to the FOCUS SERVO ON adjusted focus point to enable focus close.
- Page 8 CX-961 • Track jump A track jump is automatically performed with a microcomputer command using the LSI auto (automatic) sequence function. This system has one to 99 lens kick modes as the track jump used at search and the carriage move used in the jump exceeding 1,000 tracks.
- Page 9 CX-961 • Hysteresis operation IC401 IC301 TC9495FP BA5811FM Because the servo feed is deteriorated at setup and from track jump, hysteresis is operated to perform a servo TRACKING DIGITAL OUTPUT EQUALIZER EQUALIZER CIRCUIT feed to a stable servo loop. The hysteresis operation...
- Page 10 CX-961 • Simplified FG servo mode (2) Calculate voltage to be offset based on the value This simplified FG servo mode is used to maintain the read into earlier, and then assign the offset value to the number of disk rotations in the state of the approximate given location.
- Page 11 CX-961 RFRP SIGNAL FE SIGNAL IC301 TC9495FP RFRP 3) Focus or tracking AGC This adjustment automatically adjusts the servo loop BIAS ADJUSTMENT CIRCUIT PEAK DETECTION gain of focus or tracking AGC. DECISION BIAS WINDOW CIRCUIT The adjustment procedures are as follows: (1) Inject disturbance into the servo loop.
- Page 12 CX-961 7) Adjustment initial value (4) FE bias Standard value = 32, and the display is performed in a All automatic adjustments are basically performed unit of approximately 21.5 mV. assuming the previous adjustment value as an initial Example: For EF bias coefficient = 35, value so long as the microcomputer power supply is 35 - 32 = 3 3 x 21.5 mV = 64.5 MV...
- Page 13 CX-961 1.4 Power Supply Loading Unit This system power supply uses VD (8.3±0.5 V) supplied from the mother substrate. The VD supply destination is a 5-ch CD driver IC or 5 V regulator IC. The power supply used inside the system is the two systems of the above VD (drive system), and V+5 (control system).
- Page 14 CX-961 LOAD EJECTION OPERATING STATUS TRANSITION DIAGRAM LOADING 12cm CDLOAD CDEJET MOTOR STOP LOAD STOP 12 cm RECOGNITION CHECK CDLOAD CDEJET MOTOR STOP LOAD STOP 8 cm RECOGNITION CHECK EJECT 12cm CDLOAD CDEJET MOTOR STOP EJECT STOP CDLOAD CDEJET MOTOR...
- Page 15 CX-961 2. MECHANISM DESCRIPTIONS Carriage Motor Home SW Pickup(P8) - Configuration Core Unit Clamp SW Centering Arm R Centering Arm L Mechanical Unit Lock Arm - Loading operation 1. When a disk is inserted, the centering arm L or R rotates, and the loading motor starts when SW1 is switched from ON to OFF.
- Page 16 CX-961 1. The centering guide is supported on the shaft at the clamp arm rear part and the front part is energized to the bottom. 2. For an 8-cm disk, the disk is centered at the position where it runs against the centering guide front part as Centering Guide is, and clamp operation occours.
- Page 17 CX-961 3. DISASSEMBLY The numeral enclosed by a circle in the drawing indicates the order of removal. - How to hold the mechanical unit 1. Hold the top frame and main frame. 2. Do not hold the front of the top frame tightly because its strength is low.
- Page 18 CX-961 - How to remove the loading arm assy and spindle motor Spindle Loading Arm Assy Motor 1. Remove the E ring of the left fulcrum and remove the springs and loading arm assy. 2. Remove the connector of the spindle motor and remove the mounting three screws.
- Page 19 CX-961 - How to remove the carriage motor assy Core Unit 1. Remove the solder of the carriage motor lead wire. 2. Remove the grease cover screw and remove the grease cover. Grease Cover 3. After having removed the lead wire processing of the motor, remove the mounting screw of the carriage motor assy.