Sony-CDP-CX235-Service-Manual电路原理图.pdf

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1、STraining Manual Circuit Description and Troubleshooting Course: A-122 CD Changer Models: CDP-CX235 CDP-CX270 CDP-CX335 CDP-CX400 CDP-CX450 RadioFans.CN 收音机爱 好者资料库 Sony Service Company A Division of Sony Electronics Inc 2000 All Rights Reserved Printed in U.S.A. S is a trademark of Sony Electronics

2、RadioFans.CN 收音机爱 好者资料库 Circuit Description and Troubleshooting: Models:CDP-CX235 CDP-CX270 CDP-CX335 CDP-CX400 CDP-CX450 Prepared by: National Training Department Sony Service Company A Division of Sony Electronics Inc. Course presented by _ Date_ Student Name _ Overall Block Diagram3 Information G

3、athering3 CD Playback3 Power Supply / Display5 Power Supply5 Fluorescent Display7 Power On11 AC Power Only11 Power ON11 Communications IC501 - IC70111 Communications IC501 - IC10113 Door Motor Drive15 Operation15 Drive15 Feedback15 Tray Table Positioning17 Tray Table Slots17 Light Sensors17 Table Mo

4、tor Drive19 Front Panel Rotary Encoder - Operation19 Direction of Rotation19 Tray Table Position Sensors19 Table of Contents Tray Table Motor Drive21 CD Location the remain- der IC501 will have to gather at power ON using the sensors and switches linked to the Door, Tray Table and Loading Motors. In

5、formation Gathering Pressing the power ON button causes IC501 to use “IC SW” to switch on regulator IC506. IC506 apples power to the BD board, which houses the optical assembly. D+5V is also applied to the LED in the door compart- ment to inform the user power is ON. After Syscon IC501 turns on powe

6、r, IC501 accesses its external memory IC. Data about the disc last loaded in the CD Mechanism is returned to IC501. The disc label information is output as data to the FL Display IC for display on the front panel fluorescent tube. If there was no label infor- mation, then just the discs number is di

7、splayed. Syscon now takes a series of steps to check the memory information: 1. Syscon activates the disc door motor to close the door if its corre- sponding switch indicates the door is open. 2. Next, Syscon checks the loading motor switch position to see if the CD Mechanism is in the chucked posit

8、ion (disc loaded). If chucked, IC501 will initiate disc PB to read its TOC. If unchucked, IC501 will drive the tray table motor, rotating its discs past the disc sensors. While the tray is rotating, the tray sensors inform IC501 of the disc slot location while the disc sensor tells IC501 if there is

9、 a disc present at that slot. The last disc played according to memory will be loaded and its TOC read (if present). Once Syscon IC501 is confident the tray table information is valid, IC501 turns the CD Changer control over to the user by accepting pushbutton commands. The user can use the front pa

10、nel controls to select another disc or play that one. When Syscon knows the loading motor is in the chucked posi- tion (loading motor switch), the CD can be played. CD Playback Syscon IC501 initiates CD play by sending data, clock and latch commu- nications to IC101 on the BD board. This causes IC10

11、1 to turn on the laser, focus, tracking and spindle servos that employ the laser diode, along with the focus coil, tracking coil, sled motor and spindle motor in the opti- cal assembly. Once these servos are operating, the disc information (RFO) is output. RFO is received by Servo Control IC101 whic

12、h: Converts the data back to the original modulation scheme (EFM). Error corrects the data (parity error correction). Reconstructs its original pattern (CIRC). Creates additional digital samples (oversampling) to reduce noise in the final analog audio. Converts the signal from digital to analog form

13、 (D/A Converter). Analog audio is output from IC101 to the rear panel jacks. 4 OVERALL BLOCK DIAGRAM (MODEL CDP-CX235)7/5/00 MUTE IC701 FL DISPLAY DRIVER MEMORY IC506REG /SW POWER SUPPLY IC501 SYSTEM CONTROL IC503 MOTOR DRIVER IC401 AUDIO AMP OPTICAL PICK-UP ASSEMBLY KSS213B RF AMP DIGITAL OPTICAL O

14、UTPUT FRONT PANEL BUTTONS FL DISPLAY TUBE A-FRFO ERROR SIGNAL FL DATA,CLK,LATCH DISC DOOR LIGHT AUDIO MUTE D+5V +7V RESET IC SW +11.5V SOURCE -13.5V SOURCE -28V SOURCE LINE OUT D OUT RESET FROM IC506 M M M DOOR TRAY LOADING +5V SOURCE DISPLAY BD. BD BOARD MAIN BD. JACK BD. TO BD BOARD L R 0A122 1251

15、 COIL and Turn on the LED at the disc door compartment. This also lets the user know the unit is ON. 2. +7V from pin 9 is used to: Power the focus/sled/tracking driver IC102; and Power the coils and motors on the BD board 3. XRST from pin 6 goes HIGH to: Unmute the analog audio output lines; and Ena

16、ble Servo Control IC101 and the focus/sled/tracking driver IC102 on the BD board. Communications IC501 IC701 At power On, the communications activity increases between IC501 and IC701. This is to provide constant update information to the display IC701. , ch3 ch2 ch1 CH1 5 00 V= CH2!5 00 V= 1 2 3 T

17、IC501 Activity at Power ON ChannelNameCN501/pin 1. FL Data1 2. FL CLK (Clock)2 3. FL LT (Latch)4 Time base = 50usec/div 12 POWER ON6 28 2000 IC501 SYSCON CXP84340-075Q 3765 18 19 58 50 48 49 4497 R732 DISPLAY BD. JOG BD. CN701/602CN601/501 PUSH BUTTONS POWER 63 62 61 5 7 6 2 6 9 4 1 8 10REG 7 1 2 4

18、18 20 19 32 31 TO BD. BOARD XRST TO IC101/3, IC102/15 C509 +5V C511 C508 POWER ON MUTE (MAIN BD.) Q325,Q327, Q425 DOOR LUMINATION D+5V SOURCE 4.8V + +7V SOURCE TO DRIVER IC102 (B BD.) MAIN BD. REG EN1 EN2 RESET VCC VCC VCC +5V IC506 LA5616 ICSW 4Vp-p +11.5V 50mVp-p X501 10MHz FL DATA FL CLK FL LT KE

19、Y 1 DATA CLK XLT IC101/PIN IC701/PIN CN502 CN501 +5V IC701 FL DRIVER (DISPLAY BD.) IC101 DSP (BD.BD.) 2A122 1242 2 13 Communications IC501 IC101 Communications from Syscon to Servo Control IC101 does not occur until the disc is chucked on the spindle motor and ready to play (after the loading motor

20、finishes chucking the disc). This communications is shown below: PM3394, FLUKE & PHILIPS ch3 ch2 ch1 CH1 5.00 V= CH2!5.00 V= CH3!5 00 V= CHP MTB1 00ms- 3 24dv ch3- 1 2 3 T IC501 Activity at CD Play ChannelNameCN502/pin 1. Data18 2. CLK (Clock)20 3. XLT (Latch)19 Time base = 1msec/div 14 POWER ON6 28

21、 2000 IC501 SYSCON CXP84340-075Q 3765 18 19 58 50 48 49 4497 R732 DISPLAY BD. JOG BD. CN701/602CN601/501 PUSH BUTTONS POWER 63 62 61 5 7 6 2 6 9 4 1 8 10REG 7 1 2 4 18 20 19 32 31 TO BD. BOARD XRST TO IC101/3, IC102/15 C509 +5V C511 C508 POWER ON MUTE (MAIN BD.) Q325,Q327, Q425 DOOR LUMINATION D+5V

22、SOURCE 4.8V + +7V SOURCE TO DRIVER IC102 (B BD.) MAIN BD. REG EN1 EN2 RESET VCC VCC VCC +5V IC506 LA5616 ICSW 4Vp-p +11.5V 50mVp-p X501 10MHz FL DATA FL CLK FL LT KEY 1 DATA CLK XLT IC101/PIN IC701/PIN CN502 CN501 +5V IC701 FL DRIVER (DISPLAY BD.) IC101 DSP (BD.BD.) 2A122 1242 2 15 Door Motor Drive

23、The sliding door in the model CDP-CX235 was an improved feature over the previous manual trap door that the user pulled down to access the disc tray table. The sliding door mechanism consists of a motor that drives a series of gears to slide the door on plastic tracks. The door motor stops turning w

24、hen the limit switch is toggled in the closed or open posi- tion. Operation Syscon IC501 controls the door movement. Only after the CD Changer is powered ON will IC501 respond to the OPEN/CLOSE Door button at the Key 2 input (IC501/pin 43). Pressing the door button causes IC501 to check the position

25、 of the door. S810, a 3-position switch, places one of three voltages at Syscon IC501/ pin 39 to indicate the door position. Door Position Feedback Door PositionLocationVoltage ClosedCN504/pin 12.5V Neutral (in-between)CN504/pin 15V OpenCN504/pin 10V A closed door will be driven open and vice versa.

26、 Drive Syscon IC501 applies an output voltage to pin 23 or pin 24 to drive the motor. The resultant positive or negative voltage is applied to the door motor. Door Motor Drive MovementIC501/pin 24IC501/pin 23IC503/pin 9 Door Opening4.7V0V-3.6V Door Closing0V4.8V+3.7V Feedback As the door moves, S810

27、 enters the neutral position and 5V is applied to IC501/pin 39. When the door reaches the end of travel the door toggles the S810 limit switch to the other end. IC501/pin 39 is lowered to either 2.5 or 0V. IC501 responds by stopping the motor voltage at pin 23 or 24 16 DOOR MOTOR DRIVE6 28 2000 72 4

28、339 24 23 12 1314 9 8 7 JOG BD. 3 2 4 1 12 M DOOR MOTOR BD. NEUTRAL CLOSE OPEN R807 S810 DOOR SW BD. S621 OPEN/ CLOSE DOOR M810 R543 R551 R554 R555 1.2 R556 1.2 R552 R558 C552 R620 R557 C551 D OUT CN601/501 D IN C620 -13.5V (-VCC) +11.5V (VCC) GND +5V KEY 2 DOOR SW. CN504/811 CN812/810 IC503 CXA1291

29、P 1/3 OUT 3 DR OUT DR IN IC501 SYSCON CXP84340 73 +5V 6 10 4 12 3A122 1243 + - DR-SW. +5V R553 17 Tray Table Positioning In order for the tray table to be positioned, two rows of slots are molded into the bottom of the rotating tray table forming rings. These slots mate with light sensors stationed

30、on the bottom of the CD Changer. The sen- sors feed back information to Syscon so it can determine the exact tray table position. Tray Table Slots At the bottom of the tray table, outer ring (#2) contains 200 equally spaced slots that look like teeth. Each slot consists of an empty area (gap) in the

31、 plastic ring that passes light and an equal width tooth that blocks the light. One ring #2 slot corresponds to one disc slot. Inner ring (#1) contains different spaced gaps. Ring 1s smallest gap is equal in width to one slot and one tooth pair in ring 2. Ring 1s largest gap is the width of ten of r

32、ing 2s slots and teeth (10 disc slots). Generally, the width of a gap is one for each group of 10 disc slots. Light Sensors Each light interrupt sensor forms a U channel. At one side of the sensor there is an infrared LED that shines light through the channel. At the other end is a phototransistor t

33、hat monitors this light. When light passes through the channel (light is received by the phototransistor), the electri- cal output is HIGH. When the channel is blocked, there is no electrical output. All three sensors are used to locate the tray position as the tray rotates. Sensor IC801 monitors th

34、e gaps in ring #1. Sensors IC802 and IC803 are both used to monitor the gaps in ring #2. IC802 and IC803 sensors are positioned off center to determine the center of the slot. This off center information is necessary so the tray can stop the CD exactly in front of the CD Mechanism each time. IC801s

35、sensor records Ring #1s gap width. These gaps increase as the number of disc slots increase. Therefore with a minimum rotation of the tray table, the home position can be calculated using the data from IC801 and one of the slot sensors like IC802. 18 TRAY TABLE POSITIONING6/29/00 2 SLOTS RING 1 RING

36、 2 TRAY TOP 1 SLOT 10 SLOTS (MAXIMUM) TRAY TOP RING 1 RING 2 RING 1 RING 2 IR LED LIGHT INTERRUPT SENSOR (OUTPUT IS HIGH WHEN LIGHT IS RECEIVED) PHOTO TRANSISTOR TABLE IC801 IC802IC803 SENSORS ON T.SEN BD. (TOP VIEW) TABLE BOTTOM VIEW 5A122 1246 19 Table Motor Drive Syscon IC501 drives the Discs Tra

37、y Table. IC501 receives information from three tray table position sensors and the front panel rotary encoder knob to determine where the tray is and where to stop. Front Panel Rotary Encoder Operation At the front panel there is a large knob that is used to select discs. The knob is connected to a

38、rotary encoder switch on the jog board behind the knob. When the knob is turned to the next detent position, the display shows the information on the next disc in the tray. If that disc is desired, the same encoder button is pressed (“Enter”) and that disc is accessed. When the disc door is open, th

39、e rotary encoder rotates the tray to any disc slot position, permitting the user to load discs. The FL display tube dis- plays the same disc slot number marked on the tray at the opened door. With the door closed, the display tube shows the disc slot facing the CD Mechanism. Rotary Encoder rear view

40、 3 2 1 The rotary encoder switch is connected to Syscon at IC501/pins 42 and 43 respectively. At the encoder itself there are three contacts for the rotary encoder and two for the enter button. In the detent position, pin 1 is connected to pin 2 (ground). In the neutral position (in-between detents)

41、, pin 3 is connected to pin 2. Direction of Rotation The encoder is constructed so its direction from the detent position can be determined by IC501. In the detent position, pin 1 is grounded. In the neutral position, pin 3 is grounded. When turning the encoder knob in the CCW direction, both pins 1

42、 and 3 are momentarily grounded before pin 1 is ungrounded (“make before break”) in neutral. When turning the en- coder knob CW, both pins 1 and 3 are open circuited before pin 3 is grounded in neutral. This is how IC501 determines the direction the user has turned the knob and rotates the tray acco

43、rdingly. Tray Table Position Sensors Three sensors monitor the gaps in the tray tables rings to determine home position. Sensors IC802 and IC803 are used to determine the center of each disc slot. Sensors IC801 and the composite signal from IC802 and IC803 are used to determine where the tray is pos

44、itioned. For testing purposes, when the tray table is in a detent position, sensors IC802 and IC803 should output a HIGH at CN506/pins 1 and 2. Sensor IC801 outputs a HIGH when certain disc slot positions have been se- lected. The chart lists the disc positions IC801 will output a high in the curren

45、t 200 disc changers. With the door open, you can rotate rotary encoder and verify the disc positions in case the chassis has been bent or incorrectly aligned. Disc positions when IC801 Output = HIGH (CN506/4) Disc Positions (# displayed on the tray) Number of disc slots 10-188 30-399 50-6010 70-711

46、90-922 110-1133 130-1344 150-1555 170-1766 190-1977 Rotary Encoder knob Display Door Front Panel 20 TABLE MOTOR DRIVE7/5/00 1 4 5 2 3 511 R = 30.48k T IC801IC803IC802 4243 646362 21 22 5 6 4 RING 1 RING 2 RING 1 RING 2 RE601 KEY 3 KEY 2 DETENT 4.93 1.57 NEUTRAL 4.53 4.93 VOLTAGE TABLE RING 1 TABLE R

47、ING 2 TABLE RING 3 IC802 HOME R802 IC803 FLAG R803 IC802 FLAG R801 +5V FRONT PANEL DISC PB BUTTONS S611-S617 R612-R618 +5V R619 47k R624 MEMO SEARCH R625 INPUT S622 DOOR S621 DETECT N=NEUTRAL POSITION D=DETENT POSITION ROTARY ENCODER RE601 KEY 3 R622 KEY 3 IC802 IC803 INTERRUPT SENSOR LOCATIONS IC80

48、1 TOP VIEW T.SEN BD MAIN BD. CN506/801 CN807/507 T SENS BD. JOG BD. MOTOR BD. TABLE TRAY MOTOR R563 R564 R565 R566 R567 + - TBLL TS3TS2 TS1 IC501 SYSCON CXP84340 TBLR IC503 CXA1291P 2/3 M801 M R561 R562 CN601/501 TABLE BOTTOM 1 23 4 2 5 1 6 5 2 6 1 4A122 1244 KEY 2 67 WIPER NEUTRAL S623 21 Tray Tabl

49、e Motor Drive Syscon IC501 drives the motor that rotates the tray table. The following voltages output IC501 and IC503 to move the table in the direction viewed from the top. Tray Table Drive Voltages IC501/pinIC503/pinTable Movement2122654 Stop00000 CW03.270.44.455.37 CCW3.2700.0440.042-5.22 22 TABLE MOTOR DRIVE7/5/00 1 4 5 2 3 511 R = 30.48k T IC801IC803IC802 4243 646362 21 22 5 6 4 RING 1 RING 2 RING 1 RING 2 RE