Pioneer CX-3283 User manual

ORDER NO.
PIONEER CORPORATION 1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, Japan
PIONEER ELECTRONICS (USA) 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
PIONEER CORPORATION
2011
2011 Printed in Japan
CX-3283
CRT4843
DVD MECHANISM MODULE (LS2)
CX-3283
K-ZZZ DEC.
-This service manual describes the operation of the DVD 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 Service manual DVD Mechanism Module
AVH-2400BT/XUEW5, AVH-2400BT/XUUW5, AVH-1400DVD/XUEW5 CRT4836 CXK8003
AVH-1400DVD/XUUW5
AVH-P1400DVD/XUUC, AVH-1450DVD/XMRC, AVH-1450DVD/XURD CRT4837 CXK8003
AVH-1450DVD/XMRI, AVH-1490DVD/XMID
AVH-P3400BH/XUUC, AVH-P2400BT/XUUC, AVH-2450BT/XMRC CRT4838 CXK8003
AVH-2450BT/XURD, AVH-2450BT/XMRI, AVH-2490BT/XMID
AVH-3400DVD/XUEW5, AVH-P3400DVD/XUUW5, AVH-P3450DVD/XURC CRT4839 CXK8002
AVH-P3450DVD/XURD, AVH-P3450DVD/XURI, AVH-P3490DVD/XUID,
AVH-P3450DVD/XMRC, AVH-P3450DVD/XMRI, AVH-P3490DVD/XMID
AVH-P4400BH/XUUC, AVH-4400BT/XUEW5, AVH-P4450BT/XURC CRT4840 CXK8002
AVH-P4450BT/XURD, AVH-P4450BT/XURI, AVH-P4490BT/XUID
DVH-340UB/XMEW5, DVH-340UB/XMUW5, DVH-345UB/XMRC CRT4842 CXK8001
DVH-345UB/XMRD, DVH-345UB/XMRI, DVH-3490UB/XMID
CONTENTS
1. CIRCUIT DESCRIPTION.......................................................................................................................................................2
2. MECHANISM DESCRIPTION .............................................................................................................................................15
3. DISASSEMBLY....................................................................................................................................................................21
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2CX-3283
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1. CIRCUIT DESCRIPTION
1.1 ANALOG BLOCK (MN2DS0018MA : IC1501)
MN2DS0018MA is a one-chip LSI for a DVD Player. By connecting the LSI with a driver IC, SDRAM, Flash-ROM, Audio-DAC
and so on, a DVD Player system can be established.
The LSI incorporates the Front End (SODC / FE) to process RF signals / servo / decode, AV decoder (Back End / BE) to
process video decode such as MPEG1 / MPEG2 / JPEG and audio decode such as Dolby Digital / DTS / MP3, and a system
controller to control the system.
The Front End part processes the optical head signal computing and RF signals, the digital signals to play DVD-ROM compliant
with the DVD format (16 - 8 demodulation, error correction), and the digital signals (error correction) for CD-DA / CD-ROM,
as well as conducts AV decoder forwarding, servo control, spindle motor control and seek control.
Please note that in this MN2DS0016AAUB, the servo-related waveforms in the Front End, such as FE, TE, and AS, cannot be
observed, as in the case of a DVD mechanism module (LS1) CX-3250.
FRONT END SECTION(MN2DS0018MA : IC1501)
The functions of the analog block are:
1. Reference supply circuit
2. Signal processing circuit for the SERVO system / DPD system
Gain switching amplifier and Low Pass Filter (LPF)
3. RF signal processing circuit
RF addition circuit, Inline circuit, Variable Gain Amplifier (VGA) circuit
4. Laser Power Control (LPC) circuit
5. A/D converter for SERVO (10 bit), DPD system comparator, PWM
1.1.1 APC Circuit
The optical output of a Laser Diode (LD) has large negative temperature characteristics.
Therefore, driving LD with constant current will not get you constant optical output.
The APC circuit controls the current so that the output will be constant using a Monitor Diode (MD).
The MN2DS0018MA incorporates two types of APC circuits; one is for DVD and the other is for CD.
The LD current for a CD is calculated by dividing the measured voltage between CDLD1 and 5V by 15 ohm (3.9 ohm × 3 +
3.3 ohm = 15 ohm).
For a DVD, the current is calculated by dividing the measured voltage between DVDLD1 and 5V by 12 ohm (3.3 ohm × 2 +
2.7 ohm × 2 = 12 ohm).
The result will be about 50 mA (45 mA) for DVD (CD).
The potential difference between DVDLD1(CDLD1) and 5 V is set to approx. 600 mV(675 mV).
On this or later version of the DVD mechanism module, the Power adjustment circuit (which is the circuit from IMON to CDMP
and DVDMP) that adjusts the optical output of the LD is mounted on the mechanism module board. Therefore, it is required to
adjust power when the CRG mechanism (equipped with the PU unit) or the mechanism module board is replaced.
For details, refer to the Power Adjustment Specifications.
IC1501
MN2DS0018MA
CDL1
DVDL1
CDL0
DVDL0
CN1101
13:78LD
22:IMON
14:65LD
106:LPC02
105:CDMPD
104:LPC01
103:DVDMPD
PU Unit
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FE = (FE1) - (FE2)
After 10 bit ADC
21
20
FE2
FE1
CN1101
115
116
VIN7
VIN8 LPF
50k Hz
Input AMP LPF Buffer
LPF
50k Hz
G=0dB
Buffer AMP ADC drive AMP
Gain switching
6/7.5/9/10.5 dB
ADC
Selector
Selector
ADC
Gain switching
Gain switching
-6dB, 0dB, 9.5dB
FE1
FE2
FE signal generating circuit
+
-
1+Pfbal0,1/0x0100
1-Pfbal0,1/0x0100
Offset Cancel Fbal coarse
adjustment value FE
AMP
3dB 9dB
1.1.2 SPDL Circuit
For the SPDL motor for the DVD mechanism module, a brush motor which is used for the CD mechanism module is adopted
instead of a brushless motor which is used for the conventional DVD mechanism module.
The SPDL circuit to drive the brush motor is as shown below.
IC1501
MN2DS0018MA
66 MD 26 OPIN3-
25 OPOUT3
16 VO3-
15 VO3+
MOTOR
IC1251
MN2DS0018MA LSI
MN2DS0018MA LSI
1.1.3 FE Generating Circuit
Focus Error (FE) Generating Circuit
Signals FE1 and FE2 from PU will be AD converted and imported to IC1501. Then, taking the offset cancel into
consideration and taking the differential, FE is generated.
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4CX-3283
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CD(TE based on the three-beam method)
After 10 bit ADC
CN1101
F+H_G+H
E+G_E+F
10
11 111
112
E+G_E+F
F+H_G+H
Gain switching
-6dB, 0dB, 9.5dB
LPF
50k Hz
Input AMP LPF
G=0dB
Buffer
LPF
50k Hz
Buffer AMP
Gain switching
3dB, 9dB
Gain switching
6/7.5/9/10.5 dB
ADC
Selector
Selector ADC
AMP
MN2DS0018MA LSI
+
-
1+Ptbal0,1/0x0100
1-Ptbal0,1/0x0100
Offset Cancel Tbal adjustment value TE
AMP
MN2DS0018MA LSI
A
B
C
D
CN1101
16
17
18
19
98
99
VIN2RF
VIN4RF -6dB, 0dB, 3.5dB
LPF
11.3M
/5.7M Hz
Input AMP
gain switching
LPF Buffer gain
switching
G=0,3,6,9,12,15dB
VIN1RF
VIN3RF LPF
11.3M
/5.7M Hz
LPF
11.3M
/5.7M Hz
LPF
11.3M
/5.7M Hz
0.1uF
0.1uF
0.1uF
0.1uF
HPF
HPF
1MHz/2.5MHz/through
Phase comparator LPF (integrator)
D
++
TE signal generating circuit
TE
AMP
MN2DS0018MA LSI
DAC
CMP
Binary comparator
DAC
CMP
CMP
CMP
DAC
DAC
DAC
control filter
DAC
control filter
DAC
control filter
DAC
control filter
Phase
comparator
HPF
1MHz/2.5MHz/through
HPF
1MHz/2.5MHz/through
HPF
1MHz/2.5MHz/through
100
97
F+H_G+H
E+G_E+F
TE signal generating circuit
1.1.4 TE Generating Circuit
Tracking Error (TE) Generating Circuit
For DVD, using aphase difference method, TE is generated based on aphase difference between (A+C) and (B+D).
For CD, using athree beam method, TE is generated based on the equation TE =(F+H_G+H)-(E+G_E+F) after going
into the variable amplifier and AD converted.
DVD (TE based on phase difference)
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1.2 SERVO BLOCK (MN2DS0018MA : IC1501)
The servo block performs servo control, spindle motor control and seek control for focus, tracking, and traverse.
1.2.1 Focus Close
For both DVD and CD, the processing sequence after issuing afocus close command will be:
1.2.2 Tracking Close
For both DVD and CD, the processing sequence after issuing atracking close command will be:
1. Tracking brake
Measuring a1/2 cycle of track cross, output abrake pulse if the cycle is within the specified range. In which direction
the brake pulse should be output is determined from the phase relation between OFTR and TKCsignals (binarized
signal of TE). Once it is confirmed that the swinging of the lens against the disc has been successfully controlled,
stop braking and start pulling in. If the pulling-in conditions are not fulfilled within 10 msec after brake is output, stop
braking and start pulling in.
2. Tracking pulling-in
Process the tracking drive hold with an OFTR signal.
3. Pulling-in check
Check that track jump is less than the specified number within the specified period. The pulling-in check will time out in
8.4 msec and be retried upon receiving acommand from the microprocessor.
AS
RFENV
Close to Disc
Lens
Away from Disc
Focusing Point
FE
FODRV VHALF
1. Measurement and optimization of asignal level
Drive the PU lens in the direction to get away from the disc first, and then drive it in the direction to get closer to the disc.
During the process, measure the signal levels of FE, AS, and RFENV when it passes the focusing point.
Optimizethe signal levels for FE and AS (See and in the figure).
2. Focus pulling-in
Next, drive the lens in the direction to get away from the disc and detect pulling-in level of FE and AS.
Then, activate the Focus Loop Filter to pull in the focus (-).
3. Pulling-in check
Check the focusing with the signal levels of AS and RFENV (and ).
Using atest mode focus search, you can check the signal levels of FE, AS, and RFENV as well as focus driving voltage.
12
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67
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Tracking-on process
1.2.3 Track Jump
The system selects atrack jump method according to the target number of tracks to move from the following three schemes:
Interval Jump, Multi Jump, and Traverse Seek.
1. Interval Jump
Detailed seek is possible because this scheme repeatedly performs track jump by 1track. This scheme is selected when
it is close to the target track or it conducts aseek operation to an adjacent track.
2. Multi Jump
It counts the both edges of aTrack Cross Signal TKCand moves by the specified number of track count.
It also drives the CRG motor according to the number of jump.
3. Traverse Seek
By counting the track according to the Track Cross Signal TKCand measuring the time of TKC, it controls the movement
speed and performs the seek operation. At the same time, it minimizes the vibration in the pick-up that will occur during
movement.
Here is the common jump switching setting between DVD and CD.
Types of jump according to target number of tracks to move
CDDVD
1-10 Interval Jump1-10 Interval Jump
11-100 Multi Jump11-500 Multi Jump
101-500 Combination of Multi Jump and Interval Jump501-1000 Combination of Multi Jump and Interval Jump
501-Traverse Seek1001-Traverse Seek
Here are the wavefoms of Track Jump.
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Multi Jump (by 32 tracks) for DVD
Traverse Seek (by 1001 track) for DVD
Traverse Seek (by 10000 track) for DVD
COP-COM
TD
TE
COP-COM
TD
TE
TE
TD
Interval Jump (by 1track) for DVD
Outward Jump
TE
TD
Inward Jump
Outward Jump Inward Jump
Outward Jump Inward Jump
Outward Jump Inward Jump
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8CX-3283
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1.3 AUTOMATIC ADJUSTMENT FUNCTION
B
AD
C
FD
FE
A
BC
D
1.2.4 Focus Jump
The function of Focus Jump is for single-sided or double-sided dual layers. The nearer layer from the Objective
Lens is called Layer 0 (L0) and the farther layer called Layer 1 (L1).
Focus Jump is conducted as follows:
1. Open the tracking in the layer currently played.
2. Issue a command to execute jump to the target layer.
3. Close the tracking in the layer after the jump and restart the play.
When a jump command is issued, the processing will be:
1. Accelerate the lens toward a target layer until an FE signal detects the Focus Jump Acceleration End Level.
If the acceleration time-out time is reached before detecting the Acceleration End Level, however, it will forcibly
end the acceleration.
2. Move the lens through inertia until an FE signal detects the Deceleration Start Level without outputting drive voltage.
3. Decelerate the lens once the Deceleration Start Level is detected until it detects the Deceleration End Level.
If the deceleration time-out time is reached before detecting the Deceleration End Level, however, it will forcibly end
the deceleration.
Here are the waveforms of Focus Jump.
Waveforms of Focus Jump
Objective Lens
The system automates all kinds of circuit adjustment.
The section describes how each automatic adjustment works.
1.3.1 Offset Cancel of VIN7, VIN8, VIN9, and VIN10
Each signal of VIN7 - 9, and 10 from PU will be converted to a digital signal by the AD converter in the servo block.
The Offset Cancel function cancels the input offset of the AD converter when turning the power on.
1.3.2 VCO Gain Adjustment (VARI Adjustment)
The system has the function to automatically adjust VCO gain so that it will be constant by absorbing the variations
from part to part through learning.
To do that, VCO is locked against the reference frequency for learning.
Then, it reads a Frequency Control Value (FCNT) and adjusts the VARI register so that the value will be equal to the
target FCNT value.
1.3.3 FE Normalization Adjustment
The function is to adjust the FE signal level so that the level measured during Focus Close will be 190LSB at the digital
equalizer input stage.
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1.4 CIRC BLOCK (MN2DS0018MA : IC1501)
1.5 DRC BLOCK (MN2DS0018MA : IC1501)
1.3.7 Tracking Balance (TBAL) Adjustment
The function is to vibrate the lens in the direction of track, and using the Newton-Raphson method,
search for the balancing point where DC offset will be zero and adjust it during Focus Close and Tracking Open.
1.3.5 DPD Amplitude Adjustment
The function is to adjust the gain at the analog stage so that the input signal of the DPD comparator of the TE generating
circuit of DVD will be constant.
1.3.6 Tracking Error Amplitude Learning
The function is to vibrate the lens in the direction of track and adjust the TE amplitude level so that it will be
190LSB at the digital equalizer input stage during Focus Close and Tracking Open.
1.3.8 OFTR Adjustment
The function is to adjust the binarization threshold level to binarize an OFTR signal.
1.3.4 Focus Balance (FBAL) Adjustment
The function is to adjust a focus position so that RFENV will be maximized during Focus Close, Tracking Open
and Tracking Close.
1.3.10 Focus Gain Adjustment / Tracking Gain Adjustment
The function is to adjust to the target gain intersection point by injecting disturbance into a Servo Loop during Tracking Close.
1.3.9 AS Normalization Adjustment
The function is to fine-tune the AS signal level so that it will be 64 LSB at the digital equalizer input stage after measuring
the AS signal level by the specified number of sampling and A/D converting it at ADSC during Tracking Close.
All the automatic adjustment results can be checked on the display in a test mode.
List of Automatic Adjustment Coefficients
Caution: All coefficients are expressed in hexadecimal. The specification values for all production lines (during TP production) are used.
As for a disc used, it is TDV-582 for DVD and TCD-792 for CD.
VIN9 Offset
State
06B1 _ 08D3VIN10 Offset
F close
FEPP(FEMAX-FEMIN) 1D84 _ 6C08
AS MAX
FE Normalization Adjustment
F close (after TBAL) TEPP(TEMAX-TEMIN) 36B0 _ 80E8
Not specifiedTE Normalization Adjustment
T close
F Gain
T Gain
AS Normalization Adjustment
Power On VIN8 Offset
VIN7 Offset
-
DVD CD
Coefficient
05FB _ 0A17
05FB _ 0A17
-06B1 _ 08D3
2E18 _ A8CF
Not specified
Not specified
1235 _ 5B07
0100 _ 0400
0100 _ 0400
Not specified
The CIRC block incorporates the digital signal processing function for CD-DA and CD-ROM
(EFM demodulation and error correction) and the digital servo processing function for a Spindle Motor.
The Digital Read Channel (DRC) is equipped with A/D converter, Digital Equalizer (DEQ), Adaptive
equalizer, Viterbi detector, Digital PLL circuit, RISC interface, and peripheral circuits to read signals of an optical disc.
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1.6 POWER SUPPLY MAP
VD8(Driver)
8 V+/-0.4 V
VD8(Reg)
8 V+/-0.4 V
VDD5
5 V+/-0.4 V
1chip Driver(8 V)
5 V Reg(VCC5)
5.0 V+/-0.05 V
IC1002
S-1133B50-U5
LD
Photo IC
5 V Reg(AVCC5)
5.0 V+/-0.05 V
IC1003
S-1200B50-M5
ADAC
IC1801
PCM1753DBQ
3.3 Reg(VCC33)
3.3 V± 0.033 V
IC1004
NJM2885DL1-33
1.2 DC/DC(VCC12)
1.2 V± 0.015 V
IC1953
S-1135D12-A6
DVD1chip(3.3 V)
SDRAM
IC1480
M12L64164A-5TG2M
Flash-ROM 1 (Program)
IC1402
S99-50243D-K
Other
DVD1chip(1.2 V)
VD8V
HOST
Power Supply
mechanism inside
Power Supply
Pick UpUnit
CGY5100
1chip Driver
IC1251
BA5839FP
DVD LSI
IC1501
MN2DS0018MA
Supply
IC
Flash-ROM 2 (Data)
IC1401
S99-50243D-K
USB Circuit
IC1951
TC7SZU04FU
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1.7 CLOCK CIRCUIT
[Outline]
By connecting a 27 MHz crystal oscillator with DVD-LSI (IC1501), it generates and supplies DACCLK for
externally connected Audio-DAC in addition to the clock to be used in the LSI with the clock generator in DVD-LSI.
R1503
C1510
10 pF
1 Mohm
X1501
CSS1823
27 MHz
R1501
C1512
10 pF
156pin 155pin
OSCO OSCI
IC1501
DVD-LSI
MN2DS0018MA
IC1801
Audio-DAC
PCM1753DBQ
DACCLK
33.868 8 MHz or 36.864 MHz
220 ohm
R1508
1200 ohm
R1952
C1951
10 pF
1 Mohm
820 ohm
X1950
CSS1760
48 MHz
R1953
C1952
10 pF
50pin
USB_Clock
IC1501
DVD-LSI
MN2DS0018MA
IC1951
TC7SZU04
2pin(IN_A)
4pin(OUT_Y)
FU
[Outline of USB_Clock]
By connecting a 48 MHz crystal oscillator with DVD-LSI (IC1501), it generates and supplies the clock to be used
in the USB circuit with the clock generator in DVD-LSI (USB interface section).
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1.8 AUDIO CIRCUIT
1.9 VIDEO CIRCUIT
[Outline]
(1)Analog Audio Signal
It converts the serial 3-wire digital output +DACCLK (audio clock) coming from DVD-LSI (IC1501)to
an Analog Audio Signal at Audio-DAC (IC1801)and output it from HOST IF connector (CN1901).
At the same time, it outputs an Analog MUTE Signal from DVD-LSI (IC1501)through HOST IF
connector (CN1901).
(2)Digital Audio Signal (IEC60958/IEC61937)
It outputs the Digital Audio Signal (IEC60958/IEC61937)coming from DVD-LSI (IC1501)through the
HOST IF connector (CN1952).
[Analog Audio Signal]
[Digital Audio Signal]
Zo=820 ohm
AVCC5
Radio audio circuit
14 pin
(Lch)
Audio GND
LS2 Mechanism module
Audio DAC
(PCM1753)
16 pin
(Rch)
13,15,17 pin
(Audio GND)
fc=88 kHz
MUTE
Circuit
AMUTE 23 pin
47 kohm or more
47 kohm or more
IC1801 820 ohm
R1804
C1804
R1803
C1803
C1802
C1801
4.7 uF
4.7 uF
R1802R1801
100 kohm
100 kohm
CN1952
6 pin
(IECOUT)
CN1952
120 ohm
820 ohm
1800 pF 1800 pF
R1504
152 pin
IC1501
DVD_LSI
VTL1126
L1511
[Outline]
It outputs a Composite Signal from DVD-LSI (IC1501) and finally outputs it from HOST IF (CN1901).
DVD LSI
(DV5)
VCC33
Zo=300 ohm
LPF & 75 ohm Video Driver
12 pin(CVBS)
11 pin
LS2 Mechanism module
(*1)
138pin : Composite
CN1952
IC1501200 ohm
100 ohm
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1.10 SDRAM I/F
SDRAM Interface
*Looking from DVD-LSI
Signal Name
MDQ[15:0]
MA[11:0]
BA[1:0]
NRAS
NCAS
NEW
NCS
DQM[0]
DQM[1]
MCK
MCKI
Bits
16
12
2
1
1
1
1
1
1
1
1
I/O
I/O
O
O
O
O
O
O
O
O
O
I
Description
Data bus for external SDRAM
SDRAM address
SDRAM bank address
RAS signal of SDRAM
CAS signal of SDRAM
Write enable signal of SDRAM
Chip select signal of SDRAM
Data mask 0of SDRAM
Data mask 1of SDRAM
Clock input to SDRAM
Clock input for data input from SDRAM
[Outline]
This is the memory for implementing the AV decoding function of DVD-LSI (IC1501).
It can be used in various ways from buffering the stream data before decoding and
serving as a work area during decoding, to storing the AV and output data after decoding.
SDRAM Design
Data bus range : 16 bit
Operating frequency : 121.5MHz
CAS latency =3
8word burst forwarding
Manual precharge
CAS before RAS refresh (Auto refresh)
Connection Structure of SDRAM
DVD-LSI SDRAM
IC1501 IC1480
MDQ[15:0]
MA[11:0]
BA[1:0]
NRAS
NCAS
NEW
DQM[1:0]
NCSM
MCK
MCKI
DQ[15:0]
A[11:0]
BA[1:0]
XRAS
XCAS
XWE
DQM[1:0]
XCS
CLK
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1.11 USB CIRCUIT
[Outline]
It inputs the D-/D+signals from HOST IF (CN1952) to DVD-LSI (IC1501).
For iPod, CP_RESET, SDA and SCL are also used for the iPod authentication.
DVD LSI
(DV5)
VCC33
CN1952
IC1501
R1955
144pin
(LOUT)
146pin
(ROUT)
R1954
R1951
R1950
R1543
3pin(SDA)
R1544
2pin(RESET)
R1532
R1527
R1546 VCC33
VCC33
R1535 VCC33
47pin
(I2C_SCL)
46pin
(I2C_SDA)
61pin
(CP_Reset)
LS2 Mechanism module
6.8kohm
100 kohm
24 ohm
15 kohm
24 ohm
15 kohm
180 ohm
180 ohm
100 ohm
6.8kohm
9pin(D-)
8pin(D+)
10 pin(DGND)
4pin(SCL)
D1901
RKZ6.8TKJ
D1902
RKZ6.8TKJ
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2. MECHANISM DESCRIPTION
2.1 OUTLINE
Model for DVH
Model for AVN/AVH
(One of four types of the upper case is shown below as
an example)
The structure is as same as that of the model for DVH
Load Carriage
Motor
mechanism module
Upper Chassis Upper Case
Rear Bracket Damper
PU Unit
DVD Core Unit Spindle Motor Front Bracket
http://www.Datasheet4U.com

16 CX-3283
12 3 4
A
B
C
D
E
F
12 3 4
The structure of the CRG mechanism is common regardless of the type of the Upper Case.
CRG mechanism
Clamp Arm ASSY
Roller Arm ASSY SW Arm Disc Guide ASSY
http://www.Datasheet4U.com

17
CX-3283
56 7 8
56 7 8
A
B
C
D
E
F
2.2 DISC LOADING OPERATION
1. When the disc is inserted, SW Arm R turns and SW1 switches from OFF to ON.
When SW1 switched from OFF to ON, the Load Carriage Motor starts and the Rubber Roller rotates.
2. In the case of 12cm disc, as SW Arm spreads widely, SW1 switches from ON to OFF, and the microcomputer judges
that it is 12cm disc.
Rubber Roller
Load Carriage Motor
PU Unit
SW Arm R
DISC
SW1
http://www.Datasheet4U.com

18 CX-3283
12 3 4
A
B
C
D
E
F
12 3 4
2.3 DISC CENTERING MECHANISM
1. The 12cm disc passes under the Guide Pin and the Centering Pin, and is centered at the back position of mechanism.
Guide Pin Centering Pin12cm disc
Centering Pin
Guide Pin Guide Pin
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19
CX-3283
56 7 8
56 7 8
A
B
C
D
E
F
2.4 CLAMP MECHANISM
1. When the 12cm disc is centered on the spindle, the Detection Arm drive.
2. The Detection Arm engages the Jumping Rack with the Rack Drive Gear.
3. The Drive Lever which is joined to the Jumping Rack slides and moves the Clamp Arm down. (The disc is clamped.)
Simultaneously, the Roller Arm turns and the Rubber Roller is disconnected from the disc.
And when the Roller Arm turns, the upper and bottom mechanism locks are released and clamp operation is completed.
4. When the clamp operation is competed, the control by the Cam on the Drive Lever is removed and the Switch Lock
Arm turns.
When the Arm turns, the Switch Idle Gear moves away from the Rack Drive Gear, engages with the Feed Screw
Drive Gear and the carriage operation starts.
3
2
5
1
4
Jumping Rack
Worm Wheel
Drive Lever
Feed Screw Gear
Switch Idle Gear
Rack Drive Gear
Feed Screw Drive Gear
Rubber Roller
Clamp Arm
Detection Arm
Switch Lock Arm
Switch Idle Arm
Roller Arm
http://www.Datasheet4U.com

20 CX-3283
12 3 4
A
B
C
D
E
F
12 3 4
2.5 EJECT OPERATION
1. When the Load Carriage Motor reverses and the Pick Up moves SW2 to the inner circumference
(beyond ON), the eject operation stars in the inverse process of the above description.
2. Eject completion of 12cm disc: SW1 ONOFFONOFFON
SW1
http://www.Datasheet4U.com