Bose CD-20 Service Manual
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Bose CD-20 Service Manual

Bose CD-20 Service Manual

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Last updated 9/20/00
Includes S4, S5, S6, S8, and S9
Updated page 46 on 02/06/2001
Updated page 46, U2 on 9/19/01
Safety Information ............................................................................................................................ 2
Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 3
CD-20 Manual Revision Overview .................................................................................................. 3
Specifications ................................................................................................................................ 4-7
Theory of Operation .................................................................................................................... 8-13
Figure 1. CD-20 Block Diagram ..................................................................................................... 13
Disassembly/Assembly Procedures ....................................................................................... 14-15
Figure 2. Disassembly/Assembly View .......................................................................................... 16
Figure 3. Exploded View of Door ................................................................................................... 17
RC-20 Remote Disassembly/Assembly........................................................................................ 18
Figure 4. RC-20 Disassembly/Assembly View ............................................................................... 18
CD Mechanism Disassembly Procedures ............................................................................... 19-23
Test Procedures ........................................................................................................................ 24-28
Figure 5. Tuner Alignment Locations .............................................................................................. 28
Remote Control Alignment ............................................................................................................ 29
Figure 6. RC-20 Tuning Locations ................................................................................................. 29
Alignment Procedures .............................................................................................................. 30-31
Part List Notes ................................................................................................................................ 32
Main Part List .................................................................................................................................. 33
Figure 7. CD-20 Exploded View ..................................................................................................... 34
CD Mechanism Part List ................................................................................................................ 35
Figure 8. CD Mechanism Exploded View ....................................................................................... 36
Electrical Part List ..................................................................................................................... 37-48
Figure 9. RC-20 Remote Exploded View ....................................................................................... 48
RC-20 Remote Part List ................................................................................................................. 49
RC-20 Remote Electrical Part List ........................................................................................... 49-50
Packaging Part List ........................................................................................................................ 51
Figure 10. Packaging Exploded View ............................................................................................ 51
Accessory Part List ........................................................................................................................ 52
Figure 11. Accessory Packaging ................................................................................................... 52
IC Block Diagrams and Pinouts ............................................................................................... 53-55
CD Mechanism IC Block Diagrams .......................................................................................... 56-59
CD Mechanism IC Pin Configuration Tables .......................................................................... 60-66
CD Mechanism IC and Transistor Voltage Tables .................................................................. 67-68
CD Mechanism Troubleshooting ............................................................................................. 69-86
CD-20 Troubleshooting Waveforms ........................................................................................ 87-91
REV01-02 CHANGED MAGAZINE PART NUMBER
CAUTION: THE BOSE
VICEABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICE TO
WARRANTY SERVICE STATIONS OR FACTORY SERVICE.
Contents
®
MODEL 20 (CD-20) MUSIC CENTER CONTAINS NO USER-SER-
1

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  • Page 1: Table Of Contents

    CD Mechanism Troubleshooting ..................... 69-86 CD-20 Troubleshooting Waveforms ..................87-91 REV01-02 CHANGED MAGAZINE PART NUMBER CAUTION: THE BOSE ® MODEL 20 (CD-20) MUSIC CENTER CONTAINS NO USER-SER- VICEABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICE TO WARRANTY SERVICE STATIONS OR FACTORY SERVICE.

  • Page 2: Safety Information

    BOSE ® CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE.

  • Page 3: Electrostatic Discharge Sensitive (Esds) Device Handling

    CD-20 MANUAL REVISION OVERVIEW This service manual contains information about changes to the CD-20 PCB assemblies. It also includes the original service manual as well as the supplements (183884-S1, 183884-S2, 183884-S3) concerning the CD-20. The following PCB assemblies (as well as the original CD- 20 PCB) are covered by this service manual.

  • Page 4: Specifications

    SPECIFICATIONS Physical Dimensions: 2.6"H x 15.5"W x 8"D (6.6 x 39.4 x 20.3 cm) Weight: 5.9 lbs. (2.7kg) Top Cover: Brushed aluminum finish Bottom Cover: Plastic, Black Display: Vacuum fluorescent Power Input: 5mm coaxial power jack Detachable power-pack, 12VAC, 1.6A Line Level Inputs: Tape, Aux, Video 1, Video 2 RCA Jack pairs...
  • Page 5 SPECIFICATIONS FM Tuner (per IHF-T-200) (continued) 50 dB Quieting Sensitivity; Mono: US: 15 dBf nominal/ 20 dBf limit EURO: 20 dBf nominal/ 25 dBf limit JAPAN: 20 dBf nominal/ 25 dBf limit Stereo: US: 37 dBf nominal/ 42 dBf limit EURO: 42 dBf nominal/ 47 dBf limit JAPAN: 37 dBf nominal/ 42 dBf limit Signal to Noise Ratio:...
  • Page 6 SPECIFICATIONS AM Tuner (per IHF-T-100) (continued) Signal to Noise Ratio: 50 dB nominal/ 45 dB limit at 100 dBµV/m Distortion: 1.0% nominal/ 2.0% limit at 100 dBµV/m Frequency Response: 40 Hz: -3 dB nominal/ -6 dB limit at 100 dBµV/m, 0 dB 2 kHz: -3 dB nominal/ -6 dB limit @ 400 Hz 60 dBuV/m ±...

  • Page 7: Specifications

    SPECIFICATIONS CD Player (continued) Defect Tracking (interruption): 1.0 mm nominal/ 0.8 mm limit ABEX Test Disk TCD-725R Defect Tracking (black dot): 1.0 mm nominal/ 0.8 mm limit ABEX Test Disk TCD 725R Defect Tracking (scratch): 1.6 mm nominal/ 1.0 mm limit ABEX Test Disk TCD-721R 75 µm nominal/ 65 µm limit Defect Tracking (finger print):...

  • Page 8: Theory Of Operation

    THEORY OF OPERATION 1.0 Overview The CD-20 is a self-contained CD player with a 6-disc changer, AM/FM tuner, preamplifier, and ® control center for use with Bose powered speaker systems. In addition to the two internal sources (CD and tuner), it allows for up to four external audio sources to be connected (Tape, Aux, Video 1 and Video 2).
  • Page 9 P7, P8 and P9. The CD-20 display is divided into 8 groups, each enabled by a separate grid line (G1 through G8). Each of these groups contains up to 15 icons. Each icon is enabled by a separate segment line (S1 through S15).
  • Page 10 Zone 2 fixed audio outputs. Output #3 from U101 (pins 16 and 17) is used for the CD-20’s left and right Tape output. The micro sees to it that this output nominally is connected to the same input source as the Zone 1 output.
  • Page 11 (as described above). The #2 output of the Zone 1 volume chip is used for CD-20’s Headphone output (the #2 output on the Zone 2 chip is not used). Anyone plugging in headphones would therefore hear the same source that was previously being played by the Zone 1 speakers.
  • Page 12 THEORY OF OPERATION 5.0 Tuner Electronics (continued) The signal from the AM loop antenna enters the unit through the 2.5 mm AM jack (J300) and is fed to the AM front end module (T302). This device contains an RF tuned section and the AM local oscillator tuner circuit.

  • Page 13: Theory Of Operation

    THEORY OF OPERATION Figure 1. CD-20 Block Diagram...

  • Page 14: Disassembly/Assembly Procedures

    Push the cover (1) down until it is fully (2) until it snaps into the base (9). seated. ® Note: Align the cover so that the BOSE 6.3 Redress the ribbon cable in the logo is in the left corner. channel at the rear of the superstructure (2).
  • Page 15 DISASSEMBLY/ASSEMBLY PROCEDURES 9. CD Mechanism Removal 14. PCB Assembly (Disassemble) 9.1 Perform procedure 5. 14.1 The power supply PCB (21) and the tuner PCB (22) are plugged into the main 9.2 Lift the CD mechanism (14) straight up PCB (23). Grasp the power supply PCB or from the base (9).

  • Page 16: Figure 2. Disassembly/Assembly View

    Figure 2. Disassembly/Assembly View...

  • Page 17: Figure 3. Exploded View Of Door

    HINGE FRONT VIEW HINGE HOLDER Figure 3. Exploded View of Door...

  • Page 18: Remote Disassembly/Assembly

    RC-20 REMOTE DISASSEMBLY/ASSEMBLY Note: Numbers in parentheses correspond 2.2 Press the top cover and bottom cover to the callouts in Figure 4. together until they snap into place. 1. Enclosure Disassembly 3. PCB Removal 1.1 Slide off the battery compartment door 3.1 Lift the PCB (1) straight up.

  • Page 19: Cd Mechanism Disassembly Procedures

    CD MECHANISM DISASSEMBLY PROCEDURES 1. Main PCB Disassembly 1.1 Short the two pads on the ribbon cable coming from the pick up. 1.2 Unplug CN905. 1.3 Remove the four screws that secure the PCB to the chassis. 1.4 Lift the PCB up and remove the remain- ing connectors.
  • Page 20 CD MECHANISM DISASSEMBLY PROCEDURES Note: When installing the mount chassis (A173), line up the elevator shaft (A119) so that the lever (A55) is almost touching the eject lever (A45). The mount chassis should be at it's lowest position. 3. Elevator Motor Disassembly 3.1 Unplug the FPC (A104) from the PCB.
  • Page 21 CD MECHANISM DISASSEMBLY PROCEDURES 4. Feed Motor Disassembly 4.1 Remove the washer (A102) and then remove the DV middle gear (A81). 4.2 Remove the FPC from the feed motor with a soldering iron. 4.3 Remove the two screws (A94) that secure the feed motor (A89).
  • Page 22 CD MECHANISM DISASSEMBLY PROCEDURES 6. Lift Motor Disassembly 6.1 Perform procedure 3. 6.2 Remove the two DL springs (A228) that are located on both sides. The DL springs are black. 6.3 Remove the FPC from the lift motor (A154) with a soldering iron. 6.4 Grasp the unit where the DL springs were located and rotate the motor assem- bly section up.
  • Page 23 CD MECHANISM DISASSEMBLY PROCEDURES Note: When replacing the pickup, grease the main shaft and the U groove of the sub shaft. After securing the FPC, apply glue to the end opposite the screw. 8. Manual Magazine Ejection 8.1 With the disc clamped, rotate the lift motor worm gear (A148) 25 to 28 turns in the direction of the arrow to unclamp the disc.

  • Page 24: Test Procedures

    TEST PROCEDURES General Test Setup 2. Video Gain And Separation Test Use cable 184209 for fixed level tests. Use cable 183174 for adjustable level tests. 2.1 Apply a 2 Vrms, 1 kHz signal to the left The miniature switch number 8 on the VIDEO 1 input.
  • Page 25 TEST PROCEDURES 4. Volume Control Mute Test 7.3 While adjusting the volume up or down, the voltage at the tip should be ≥ .6 VDC. 4.1 Apply a 2 Vrms, 1 kHz signal to the AUX input. 8. FM Alignment 4.2 Set the volume control to maximum.
  • Page 26 TEST PROCEDURES 12.4 Tune the generator and the unit to 10. FM Stop Level Adjustment 1080 kHz. Adjust the brown slug of T302 Note: Do not perform the following test for for maximum output. PCB 250736. 12.5 Repeat steps 12.3 and 12.4 until 10.1 Inject an RF signal into the FM an- maximum output is obtained.
  • Page 27 TEST PROCEDURES 15. CD Tracking Ability 15.1 The test discs listed in the chart below should be played with no audible defects. 15.2 If the unit fails any of these tests, replace the CD mechanism assembly or proceed to the Alignment procedures. Disc Test Test Conditions...

  • Page 28: Test Procedures

    TEST PROCEDURES PCB 178335 PCB 199827 PCB 250736 Figure 5. Tuner Alignment Locations...

  • Page 29: Remote Control Alignment

    REMOTE CONTROL ALIGNMENT 1. Remote Control Tuning 1.1 Connect TP48A (BATT +) to TP47. 1.2 Connect TP48A (BAT +) to L1 (AM MOD). 1.3 Connect an oscilloscope probe to TP22. Connect the scope ground near TP22. Note: A x10 probe is recommended. 1.4 Rotating C14 360 degrees, you should see two points where the signal peaks.

  • Page 30: Alignment Procedures

    Perform these procedures in exact order! 1. FE Bias Alignment Figure 1. FE Bias Alignment 1.1 Connect the power pack to the CD-20 and leave the CD-20 in the OFF mode. Changer PCB 1.2 Connect a DC voltmeter to TP824 (FE TP705 out) and TP704 (1/2 Vcc).

  • Page 31: Alignment Procedures

    Figure 5. Symmetrical Waveform labeled TE and connect the alignment fixture as shown in Figure 4. 4.3 Plug the CD-20 in and play track num- ber 1 of the A•Bex CD TCD-784. 4.4 Switch the CD-20 alignment fixture's oscillator to 2.15 kHz.

  • Page 32: Part List Notes

    6. This part is used on the 178335 PCB only. The 178335 PCB is the original PCB used on the CD-20. Most of the parts listed are common to all of the PCB variants. 7. This part is used on the European variant.

  • Page 33: Main Part List

    MAIN PART LIST (Refer to Figure 7) Item Description Part Q t y . Note Number Number COVER, TOP 180038 SCREW, TAPP, 6-13 X .875, PAN, XREC 187426-14 SUPERSTRUCTURE 182311 or 250257 PCB, ASSEMBLY 271911-101CK 1,4, 271911-101C or without BASE ASSY 183889-001 connector kit SPRING, MOUNTING, CD-MECH...

  • Page 34: Figure 7. Cd-20 Exploded View

    Figure 7. CD-20 Exploded View...

  • Page 35: Cd Mechanism Part List

    Note: The table above lists all the parts that are available for the CD changer mechanism portion of the CD-20. The part numbers that are not proceeded by a letter represent an assem- bly that is outlined in Figure 8. Part numbers that are preceded by a letter represent individual...

  • Page 36: Figure 8. Cd Mechanism Exploded View

    Figure 8. CD Mechanism Exploded View...

  • Page 37: Electrical Part List

    ELECTRICAL PART LIST Resistors Reference Designator Description Part Number Note 82 OHM, 2512, 1W, 5% 181895-82R0 7.5 OHM, 2512, 1W, 5% 181895-7R5 130 OHM, 2512, 1W, 5% 181895-1300 910 OHM, 1206, 1/8W, 5% 124895-9115 2.0K, 2512, 1W, 5% 181895-2001 2.7K, 2512, 1W, 5% 181895-2701 330 OHM, 0805, 1/10W, 5% 133626-3315...
  • Page 38 ELECTRICAL PART LIST Resistors (continued) Reference Designator Description Part Number Note R147 220 OHM, 0805, 1/10W, 5% 133626-2215 R148 10.0K, 0805, 1/10W, 5% 133626-1035 R152 4.7K, 0805, 1/10W, 5% 133626-4725 R161 100K, 0805, 1/10W, 1% 133625-1003 R162 100K, 0805, 1/10W, 1% 133625-1003 R163 100K, 0805, 1/10W, 1%...
  • Page 39 ELECTRICAL PART LIST Resistors (continued) Reference Designator Description Part Number Note R325 2.7K, 0805, 1/10W, 5% 133626-2725 R326 8.2K, 0805, 1/10W, 5% 133626-8225 R326 3.09K, 0805, 1/10W, 1% 133625-3091 R328 12K, 0805, 1/10W, 5% 133626-1235 R329 5.11K, 0805, 1/10W, 1% 133625-5111 R330 10 OHM, 0805, 1/10W, 5%...
  • Page 40 ELECTRICAL PART LIST Resistors (continued) Reference Designator Description Part Number Note R406 1.00K, 0805, 1/10W, 5% 133626-1025 R408 100 OHM, 0805, 1/10W, 5% 133626-1015 R409 1.00K, 0805, 1/10W, 5% 133626-1025 R410 10.0K, 0805, 1/10W, 5% 133626-1035 R411 1.00K, 0805, 1/10W, 5% 133626-1025 R412 1.00K, 0805, 1/10W, 5%...
  • Page 41 ELECTRICAL PART LIST Resistors (continued) Reference Designator Description Part Number Note R456 511 OHM, 0805, 1/10W, 1% 133625-5110 R457 511 OHM, 0805, 1/10W, 1% 133625-5110 R458 511 OHM, 0805, 1/10W, 1% 133625-5110 R459 511 OHM, 0805, 1/10W, 1% 133625-5110 R460 511 OHM, 0805, 1/10W, 1% 133625-5110 R461...
  • Page 42 ELECTRICAL PART LIST Capacitors (continued) Reference Designator Description Part Number Note .01uF, 0805, X7R, 50V, 10% 133623-103 .01uF, 0805, X7R, 50V, 10% 133623-103 100uF, EL, 85°C, 50V, 20% 149948-101H .01uF, 0805, X7R, 50V, 10% 133623-103 100uF, EL, 85°C, 50V, 20% 149948-101H 100uF, EL, 85°C, 50V, 20% 149948-101H...
  • Page 43 ELECTRICAL PART LIST Capacitors (continued) Reference Designator Description Part Number Note C141 180pF, 0805, COG, 50V, 5% 133622-181 C142 180pF, 0805, COG, 50V, 5% 133622-181 C143 1000pF, 0805, COG, 50V, 5% 133622-102 C144 180pF, 0805, COG, 50V, 5% 133622-181 C145 470uF, EL, 85°C, 25V, 20% 149948-471E C145...
  • Page 44 ELECTRICAL PART LIST Capacitors (continued) Reference Designator Description Part Number Note C324 39pF, 0805, COG, 50V, 5% 133622-390 C325 10uF, EL, 85°C, 25V, 20% 149947-100E C326 470pF, 0805, COG, 50V, 5% 133622-471 6, 7 C326 100pF, 0805, COG, 50V, 5% 133622-101 C327 3300pF, 0805, X7R, 50V, 10%...
  • Page 45 ELECTRICAL PART LIST Capacitors (continued) Reference Designator Description Part Number Note C420 39pF, 0805, COG, 50V, 5% 133622-390 C421 47uF, 85°C, 16V, EL, 20% 178198-470C C422 2.2uF, 1206, Y5V, 16V, 80% 178212-225 C423 .047uF, 0805, Z5U, 20% 148779-473 C432 .01uF, 0805, X7R, 50V, 10% 133623-103 C433 1uF, 1206, Y5V, 16V, 80%...
  • Page 46 **Q101, 103, 106 ans 312 part number 146817 changed to 258024. Use 146817 as an alternate 02/06/2001. *** Q105 and 302 part number 146818 changed to 258025. Use 146818 as an alternate 02/06/2001. ELECTRICAL PART LIST Transistors Reference Designator Description Part Number Note MMBT3904, NPN, SOT...
  • Page 47 ELECTRICAL PART LIST Transformers Reference Designator Description Part Number Note CF300 FILTER, CER., 10.7MHz, 280 kHz 253037-001 CF300 FILTER, CER., 10.7MHz, 230 kHz 253037-002 CF301 FILTER, CER., 10.7MHz, 280 kHz 253037-001 CF301 FILTER, CER., 10.7MHz, 230 kHz 253037-002 CF302 FILTER, CER., 10.7MHz, 280 kHz 253037-001 CF302 FILTER, CER., 10.7MHz, 230 kHz...
  • Page 48 ELECTRICAL PART LIST Switches Reference Designator Description Part Number Note S700 SWITCH, TACTILE DOME, 160gf 172999-02 S701 SWITCH, TACTILE DOME, 160gf 172999-02 S702 SWITCH, TACTILE DOME, 160gf 172999-02 S703 SWITCH, TACTILE DOME, 160gf 172999-02 S704 SWITCH, TACTILE DOME, 160gf 172999-02 S705 SWITCH, TACTILE DOME, 160gf 172999-02...

  • Page 49: Remote Part List

    RC-20 REMOTE PART LIST (Refer to Figure 9) Item Description Part Qty Per Note Number Number Assembly PCB Assembly 194386 1, 2 Pad, Switch, Remote, RC 20, 178379 Audio Cover, Bottom, Remote 146089 Control Cover, Top, Remote Control, 176190 Universal Door, Battery, Remote 146226 Control...

  • Page 50: Rc-20 Remote Electrical Part List

    RC-20 REMOTE ELECTRICAL PART LIST Capacitors Reference Designator Description Part Number Note 10 µF, 16v, 20% 177902-100C .047 µF, 50V, 20% 148779-473 100 pF, 50V, 5% 133622-101 100 pF, 50V, 5% 133622-101 .047 µF, 50V, 20% 148779-473 1000 pF, 50v, 5% 133622-102 .01 µF, 50V, 10% 133623-103...

  • Page 51: Packaging Part List

    PACKING, INSERT D/C CARD 188022 SCREW, SHIPPING, CD MECH. 198583 PACKING, TOP PAD, EPS 186424-001 PACKING, TRAY, EPS 186425-001 CARTON, D/C, CD-20 188020-001 BAG, MICROFOAM, 18 x 10.5 174591 MAGAZINE, 6 DISC 256261 REMOTE 178915 Figure 10. Packaging Exploded View...

  • Page 52: Accessory Part List

    ACCESSORY PART LIST Item Description Part Q t y . Note Number Number POWER PACK, 100V 178372 POWER SUPPLY, 120V 178371 POWER PACK, 220V, EURO 178375 POWER PACK, 230V, UK/SING. 251773 POWER PACK, 240, AUST. 178373 REMOTE 187700 MAGAZINE, 6 DISC 263040 10/01 PACKING TRAY...

  • Page 53: Ic Block Diagrams And Pinouts

    IC BLOCK DIAGRAMS AND PINOUTS U101 Part Number 177984-2...
  • Page 54 IC BLOCK DIAGRAMS AND PINOUTS U100, 102 Part Number 177938...

  • Page 55: Ic Block Diagrams And Pinouts

    IC BLOCK DIAGRAMS AND PINOUTS U302 Part Number 147527 U300 Part Number 146815...

  • Page 56: Cd Mechanism Ic Block Diagrams

    CD MECHANISM IC BLOCK DIAGRAMS IC 821 (CXA1782BQ) Servo Signal Processor RF Amplifier...
  • Page 57 CD MECHANISM IC BLOCK DIAGRAMS ATTN MODN TSTN LRCI Input Interface DCKI Filter Calculate Infinity Attenuation Zero Detect Calulate Block DFS1 XVSS DFS2 Timing Control MUTEO Noise Shaper PWM Data Calculate Generation Block Block RSTN XVDO DVSS DVDD AVDO4 AVDO1 18 19 21 22 IC 201 (SM5871AS) D/F and D/A Converter...
  • Page 58 CD MECHANISM IC BLOCK DIAGRAMS (8) Vcc ---- (4) Vss----- Start Cycle H.V. Generation Timining and Control (5) SDA Start Stop Logic Control Logic Load (6) SCL C Prom XDEC Word 32 X 32 Address Counter YDCC Dout Data Register D out IC 602 (X204C01SI) IC 861 (BA6398FP) CD Driver and +5V Regulator...
  • Page 59 CD MECHANISM IC BLOCK DIAGRAMS Basic Bit SEQ. Interval Buffer:16 Timer Program INTBT Counter SP (8) Port 0 P00-P03 Timer/Event Counter PT100/P20 P10-P13 Port 1 INTTO Bank Timer/Event Counter Port 2 P20-P23 PT01/P21 INTT1 P30-P33 Port 3 S1/PO3 Serial General Reg. SO/PO2 Interface _______...

  • Page 60: Cd Mechanism Ic Pin Configuration Tables

    CD MECHANISM IC PIN CONFIGURATION TABLES IC 201 (SM5871AS) D/F and D/A Converter Table I / O Terminal Description Name Crystal oscillator output XVss Clock ground CKSLN Clock frequency select input. Internal pull-up resistor Clock output TSTN Test input. This pin should be tied HIGH for normal operation.
  • Page 61 CD MECHANISM IC PIN CONFIGURATION TABLES IC 601 (uPD75116GF-K12) Microprocessor Table (continued) I / O Terminal Description Name TEMP Thermosensor input EJECTS Eject switch input ACCIN Acc ON/OFF input LOMP Loading motor output LOMN Loading motor output ELEVMN Elevator motor output ELEVMP Elevator motor output RESET LSI reset signal...
  • Page 62 CD MECHANISM IC PIN CONFIGURATION TABLES IC 601 (uPD75116GF-K12) Microprocessor Table (continued) I / O Terminal Description Name LIFTSW Lift switch input COMDO Correspondence data output Power supply of PROM writing Power supply (+5V) CDINOK CD mechanism in switch input CD+B Divider unit control signal Clock output for S-RAM data reading...
  • Page 63 CD MECHANISM IC PIN CONFIGURATION TABLES IC 801 (CXD2517Q) Digital Signal Processor Table I / O Terminal Description Name Focus OK input. Used for SENS output and the servo auto sequencer Spindle motor servo control Test Test pin. Normally GND. FILO Master PLL (slave=digital PLL) filter output.
  • Page 64 CD MECHANISM IC PIN CONFIGURATION TABLES IC 801 (CXD2517Q) Digital Signal Processor Table (continued) I / O Terminal Description Name SCOR Outputs high signal when either subcode sync S0 or S1 is detected. S Q S O SubQ 80-bit serial output. SQCK SQSO readout clock input.
  • Page 65 CD MECHANISM IC PIN CONFIGURATION TABLES IC 821 (CXA1782BQ) Servo Signal Processor RF Amplifier Table (continued) I / O Terminal Description Name TA_M Tracking amplifier negative input pin. TA_O Tracking drive output SL_P Sled amplifier non-inversed input. SL_M Sled amplifier negative input pin. SL_O Sled drive output.

  • Page 66: Cd Mechanism Ic Pin Configuration Tables

    CD MECHANISM IC PIN CONFIGURATION TABLES IC 821 (CXA1782BQ) Servo Signal Processor RF Amplifier Table (continued) I / O Terminal Description Name I-V amplifier E gain adjustment. (When not using automatic balance adjustment) Tracking error amplifier output. E-F signal is output. LPFI Comparator input for balance adjustment.

  • Page 67: Cd Mechanism Ic And Transistor Voltage Tables

    CD MECHANISM IC AND TRANSISTOR VOLTAGE TABLES Condition: DC voltage at stop mode. Voltage readings from common ground are measured with a digital voltmeter. Pin\Xistor Q201 Q202 Q203 Q204 Q205 Q601 Q602 Q701 Q702 Q703 Q704 14.4 14.4 14.4 14.2 14.4 14.4 14.4...
  • Page 68 CD MECHANISM IC AND TRANSISTOR VOLTAGE TABLES IC801 12 13 16 17 2.5 2.5 NC NC 23 24 27 28 31 32 35 36 NC NC NC NC NC NC NC NC NC NC NC 42 43 46 47 50 51 54 55 NC NC 61 62...

  • Page 69: Cd Mechanism Troubleshooting

    CD MECHANISM TROUBLESHOOTING...
  • Page 70 CD MECHANISM TROUBLESHOOTING...
  • Page 71 TROUBLESHOOTING...
  • Page 72 CD MECHANISM TROUBLESHOOTING...
  • Page 73 CD MECHANISM TROUBLESHOOTING...
  • Page 74 CD MECHANISM TROUBLESHOOTING...
  • Page 75 CD MECHANISM TROUBLESHOOTING...
  • Page 76 CD MECHANISM TROUBLESHOOTING...
  • Page 77 CD MECHANISM TROUBLESHOOTING...
  • Page 78 CD MECHANISM TROUBLESHOOTING...
  • Page 79 CD MECHANISM TROUBLESHOOTING...
  • Page 80 CD MECHANISM TROUBLESHOOTING...
  • Page 81 CD MECHANISM TROUBLESHOOTING...
  • Page 82 CD MECHANISM TROUBLESHOOTING...
  • Page 83 CD MECHANISM TROUBLESHOOTING...
  • Page 84 CD MECHANISM TROUBLESHOOTING...
  • Page 85 CD MECHANISM TROUBLESHOOTING...
  • Page 86 CD MECHANISM TROUBLESHOOTING...

  • Page 87: Troubleshooting Waveforms

    CD-20 TROUBLESHOOTING WAVEFORMS...
  • Page 88 CD-20 TROUBLESHOOTING WAVEFORMS...
  • Page 89 CD-20 TROUBLESHOOTING WAVEFORMS...
  • Page 90 CD-20 TROUBLESHOOTING WAVEFORMS...

  • Page 91: Cd-20 Troubleshooting Waveforms

    CD-20 TROUBLESHOOTING WAVEFORMS...
  • Page 93 ® LIFESTYLE MODEL 20 MUSIC CENTER (CD-20) Service Manual © 1999 Bose Corporation Part Number 183884 REV. 02...
  • Page 94 SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE ® ® Bose Corporation The Mountain Framingham Massachusetts USA 01701 P/N 183884 REV. 02 09/99 FOR TECHNICAL ASSISTANCE OR PART ORDERS, CALL 1-800-367-4008...

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