BOSE CD-20 SM Schematic

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LIFESTYLE® MODEL 20

MUSIC CENTER

(CD-20)

1999 Bose Corporation

Service Manual

Part Number 183884 REV. 02

Last updated 9/20/00

REV01-02 CHANGED MAGAZINE PART NUMBER

Updated page 46 on 02/06/2001

Updated page 46, U2 on 9/19/01

Includes S4, S5, S6, S8, and S9

Contents

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

CAUTION: THE BOSE

MODEL 20 (CD-20) MUSIC CENTER CONTAINS NO USER-SERVICEABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICE TO WARRANTY SERVICE STATIONS OR FACTORY SERVICE.

SAFETY INFORMATION

1. Parts that have special safety characteristics are identified by the symbol on schematics or by special notes on the parts list. Use only replacement parts that

have critical characteristics recommended by the manufacturer.

2. Make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit before returning the unit

to the customer. Use the following checks to perform these measurements:

A. Leakage Current Hot Check-With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 “Leakage Current for Appliances” and Underwriters Laboratories (UL) 1492 (71). With the unit AC switch first in the ON position, then in the OFF position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the unit power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN

THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZ ARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.

B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and

connect a jumper wire between the two prongs of the plug. (2) Turn on the

power switch of the unit. (3) Measure the resistance with an ohmmeter be-

tween the jumpered AC plug and each exposed metallic cabinet part on the unit. When the exposed metallic part has a return path to the chassis, the reading should be between 1 and 5.2 Megohms. When there is no return path

to the chassis, the reading must be “infinite”. If it is not within the limits specified, there is the possibility of a shock hazard, and the unit must be repaired and re checked before it is returned to the customer.

PROPRIETARY INFORMATION

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF BOSE 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.

CORPORATION WHICH IS BEING FURNISHED ONLY FOR

ELECTROSTATIC DISCHARGE SENSITIVE (ESDS)

DEVICE HANDLING

This unit contains ESDS devices. We recommend the following precautions when repairing, replacing, or transporting ESDS devices:

• Perform work at an electrically grounded work station.

• Wear wrist straps that connect to the station or heel straps that connect to conductive floor mats.

• Avoid touching the leads or contacts of ESDS devices or PC boards even if properly grounded. Handle boards by the edges only.

• Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap or plastic trays.

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 CD20 PCB) are covered by this service manual. PCB part number 199827 (has a slight change to the AM circuit to enable the use of a new AM antenna), PCB part number 250736 (incorporates a new FM section).

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

Right=Red, Left=White

Line Level Outputs: Tape RCA Jack pair

Right=Red, Left=White

Zone 1: Miniature 8-pin DIN connector L/R fixed line level audio, L/R

variable line level audio, DC turn on signal, speaker command data out, audio ground, and data ground

Zone 2: Miniature 8-pin DIN connector L/R fixed line level audio, L/R

variable line level audio, DC turn on signal, speaker command data out, audio ground, and data ground

Serial Data Port: 3.5mm miniature stereo jack data out, data in, and ground Antenna Input: AM 2.5mm mono jack

FM, 75Ω USA/CSA "F" type

EURO "PAL" type JAPAN "F" type

Headphone Connector: 3.5mm stereo jack Variable level output

FM Tuner (per IHF-T-200)

Channel Spacing: US: 200 kHz

EURO: 50 kHz JAPAN: 100 kHz

Band Limits: US: 87.5 MHz-107.9 MHz

EURO: 87.50 MHz- 108.00 MHz JAPAN: 76.00 MHz-90.00 MHz

De-emphasis: U.S./ Military version: 75µs

EURO version: 50µs JAPAN version: 50µs

Usable Sensitivity: US: 12 dBf nominal/ 17 dBf limit

EURO: 17 dBf nominal/ 22 dBf limit JAPAN: 12 dBf nominal/ 17 dBf limit

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: Mono: 75 dB nominal/ 70 dB limit

Stereo: 65 dB nominal/ 60 dB limit

Harmonic Distortion: Mono: 0.2% nominal/ 1.0% limit

Stereo: 0.3% nominal/ 1.5% limit

Capture Ratio: 1.5 dB nominal/ 2.5 dB limit AM Rejection: 60 dB nominal/ 50 dB limit at 45 dBf Alternate Channel

Selectivity:

Image Rejection: US: 45 dB nominal/ 40 dB limit

RF Inter-modulation: 60 dB nominal/ 50 dB limit Sub-carrier Product Rejection: 55 dB nominal/ 45 dB limit Frequency Response: ± 0.5 dB nominal/ ± 1.5 dB limit 30 H z - 15 kHz Stereo Channel Separation: 40 dB nominal/ 25 dB limit at 1 kHz

US: 70 dB nominal/ 65 dB limit EURO: 75 dB nominal/ 70 dB limit JAPAN: 70 dB nominal/ 65 dB limit

EURO: 85 dB nominal/ 70 dB limit JAPAN: 45 dB nominal/ 40 dB limit

at 65 dBf US = ± 75 kHz deviation EURO = ± 40 kHz Deviation

at 65 dBf

at 45 dBf

Auto Stop Level: 32 dBf ± 3 dB Adjacent Channel Selectivity: 12 dB nominal/ 7 dB limit at 45 dBf

AM Tuner (per IHF-T-100)

Channel Spacing: US: 10 kHz

EURO: 9 kHz JAPAN: 9 kHz

Band Limits: US: 530 kHz - 1710 kHz

EURO: 522 kHz - 1611 kHz JAPAN: 522 kHz - 1629 kHz

Usable Sensitivity: 55 dBµV/m nominal/ 60 dBµV/m

limit

Alternate Channel Selectivity: 60 dB nominal/ 50 dB limit Adjacent Channel Selectivity: 45 dB nominal/ 35 dB limit Image Rejection Ratio: 40 dB nominal/ 30 dB limit

IHF standard test loop

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

2 kHz: -3 dB nominal/ -6 dB limit

Auto Stop Level: 60 dBuV/m ± 3 dB

Preamplifier

Input Impedance: AUX/ VIDEO 1, 2 = 33kΩ

TAPE = 48kΩ

Output Impedance: Zone 1, 2 =:220Ω

TAPE: = 220Ω

Output Voltage: FM: 0.6 Vrms

AM: 0.4 Vrms CD: 2.0 Vrms

Headphone Output: 31 mW ±2 dB 32Ω load, 1 Vrms Aux input

Maximum Output Level: 2.0 Vrms ± 2 dB 1 kHz, THD < .12% THD: .02% nominal/ .08% limit Output = 1 Vrms Frequency Response: ± 0.5 dB nominal/ ±1.0 dB limit 20 Hz- 20 kHz Signal to Noise Ratio: 115 dB nominal/ 100 dB Limit A-weighted, max volume

at 100 dBµV/m, 0 dB @ 400 Hz

±30%, 1 kHz, max volume ±40%, 1 kHz, max volume

±10%, 1 kHz, max volume

Mono/ 75 kHz dev. 30% mod., 100 dBuV/m ABEX TCD-782 TNO2

THD <0.15%

Channel Separation: 70 dB nominal/ 50 dB limit Switching "pops" and "clicks": 1 mV nominal/ 10 mV limit pk, max. vol. Muting, Zone 1 and 2 outputs: -100 dB nominal/ -90 dB limit

CD Player

Digital to Analog Process: 4X Over-sampling, dual one bit D/A Maximum Output Level: 2.0 V ± 2 dB THD + Noise: 0.03% nominal/ 0.12% limit at 1 kHz, 0 dB Signal to Noise Ratio: 90 dB nominal/ 85 dB limit A-weighted Channel Separation: 70 dB nominal/ 50 dB limit at 1 kHz Frequency Response: ± 0.5 dB nominal/ ± 1.0 dB limit 20 Hz - 20 kHz Low-level Linearity Error: 5.0 dB nominal/ 10.0 dB limit -90 dB Dynamic Range: 95 dB nominal/ 90 dB limit

SPECIFICATIONS

D 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 Defect Tracking (finger print): 75 µm nominal/ 65 µm limit ABEX Test Disk TCD-725R Defect Tracking (warped disc): 1.0 mm nominal/ 0.7 mm limit ABEX Test Disk TCD-732RA Defect Tracking (eccentric disc): 210 µm nominal/ 140 µm limit ABEX Test Disk TCD-714R Cueing Time: 2 sec nominal/ 3 sec limit Phillips TS4, TNO 1-15 De-emphasis Error: 5 kHz: -4.53 dB ± 2 dB

16 kHz: -9.04 dB ± 2 dB

Disc Access Time: 5 seconds nominal/15 seconds limit Any disc playing to any

other disc playing

Disc Unload Time: 5 seconds nominal/15 seconds limit Any disc playing or stopped

to ejected magazine

1.0 Overview

THEORY OF OPERATION

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 sources (CD and tuner), it allows for up to four external audio sources to be connected (Tape, Aux, Video 1 and Video 2). It uses an RF remote control, allowing it to be operated from different rooms within a house without the line-of-sight restrictions of an IR remote. No CE-1 type functionality has been included. All Smart Speaker data commands (i.e.-for AM-25P) have been implemented.

The CD-20 has two independent output zones, similar to CD-10, accessible through circular DIN connectors in the back of the product. This allows Zone 1 to play any of the six possible audio sources, while Zone 2 plays the same source (or any other audio source) simultaneously. The only restriction is that AM and FM cannot be played simultaneously (there is only one tuner source, usable in only AM or FM mode at a given time).

2.0 Power Supply Electronics (Schematic Diagram Sheet 1) The unit is powered by an external 12 VAC power supply capable of delivering 1.6 Amps RMS. D12, D1 and C3 form a positive half-wave rectifier that supplies voltage to the CD_VCC regu-

lator transistor Q10 (which powers the CD mechanism). Feedback components R23, D13 and R24 sample the CD output voltage, divide it down, and apply it to Q11's emitter. Q11 keeps Q10 turned on until the CD_VCC voltage reaches the desired level. Once CD_VCC reaches about 14.5 volts, Q10 goes linear and keeps the output voltage from going any higher. To disable the CD_VCC supply, the CD_RES line is set to +5V by the microprocessor, which turns Q1 and Q2 on. Q1 keeps Q11 turned off, while Q2 quickly shorts CD_VCC to ground (turning the CD mechanism off immediately).

powered speaker systems. In addition to the two internal

R2, D4 and C6 form a positive half-wave rectifier that supplies voltage to +5V regulator IC U1. The +5V circuit powers the microprocessor and EEPROM. The microprocessor monitors the DETECT line (via comparator U402) in case of a power failure.

D5 and C10 form a positive half-wave rectifier that supplies voltage to +10V regulator IC U2. The +10V supply powers all the audio circuitry, the tuner, and the enable lines for the external powered speakers.

C24, R28, R29 and C21 form a resistor/capacitor AC voltage divider that provides the 4.2 VAC for the VFD (display) filament. The -30 Vdc and -24 Vdc supplies are also for the VFD, and are generated using a negative voltage tripler. D6, D9, D7, C15, C23, and C18 form the tripler. R11 and zener diode D18 regulate the tripled voltage to -30V. The -24 Vdc supply is divided down from the -30 Vdc by R26, R12 and R14.

The enable lines (also referred to as +10V control lines) for the powered speakers (Z1_ENBL and Z2_ENBL) are powered by Q102 and Q104. Q101 and Q103 provide base turn-on current when the microprocessor sets Z1_ENBL or Z2_ENBL to +5V. The output of the enable lines is current-limited to less than 100 mA by R134 and R138. This protects against accidental shortcircuits in the speakers or their cables.

THEORY OF OPERATION

3.0 Control Electronics (schematic Diagram Sheet 3)

The audio circuits, tuner, CD mechanism, display, EEPROM, remote receiver, push buttons, and AC power status are all overseen by microprocessor (micro) U400. The micro is clocked by an 8 MHz ceramic resonator (X401) and is given a reset pulse by U403 (the reset IC). This occurs whenever the +5V power supply falls below about 4.75V and automatically at power-up.

The micro communicates with all three audio chips (U100, U101, and U102) using a three wire interface (clock, data and ground). In all three cases, the clock line is the ACLOCK line, port P35 on the micro. Depending on which chip is being addressed, the micro may use either the ADATA_1 or ADATA_2 lines to send the data. The data is sent in I2C format to all three chips. The micro sends commands to the audio chips whenever new input sources are selected, or the volume needs to change, or a zone needs to mute or unmute.

The micro changes AM and FM tuner stations by writing to the PLL (Phase-Locked Loop) chip U302. This information is sent using the same clock and data lines used for the audio chips (ACLOCK and ADATA_2). However, the PLL chip enable (PLL_CE) must also be high for the chip to receive the message. The micro can tell when a station is strong enough to stop seeking by monitoring the RF_SIG/ line from U300 (the LA1851 detector chip). The micro can then check to see if that same station is transmitting a valid carrier (in case an adjacent station was strong enough to fool it into stopping) by asserting the F_TEST line. The result of the frequency test is signaled to the micro by the RF_F_OK line.

The CD-20’s 6-disc CD mechanism is a complete (mechanical as well as electrical) assembly that is purchased as an OEM unit from FMS (Ford Mazda Sanyo). It comes with its own microprocessor-based controller PCB that is capable of many functions. The CD-20’s micro communicates with this PCB via a dedicated serial data bus (CD_BUS, micro port P12). The CD-20 micro (U400) sends control commands (play, pause, stop, skip forward, etc.) to the mechanism via the CD_BUS line, and receives disc, track, etc., information in the same way. The CD mechanism is enabled by U400 by dropping the CD_RES (CD reset) line and raising the CD_ENBL (CD enable) line. The appropriate control commands are then sent.

The micro controls the vacuum fluorescent display (VFD400) with its on-chip VFD driver. The driver scans the display’s grids and segments automatically using ports 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). Although icons appear to be lit constantly, in fact each is actually turning on and off at a rate too fast to see. Each of the 8 groups of icons are only enabled 1/8th of the time (first group 1, then group 2, etc., in a repeating sequence). The segment lines are used to select which icons should be lit as each icon group gets enabled. The 511 Ω series resistors are added to reduce scan currents that might interfere with AM tuner reception. All series resistors and inductors on the +5V, +10V, -24V and -30V power supply lines are similarly added to reduce tuner interference.

U401 is a 1k-bit (128 bytes x 8) EEPROM (Erasable, Programmable Memory) that stores the AM and FM station presets, RF remote House Code and background (self-test) information. Whenever a new preset is stored or erased by the user, information gets written to U401. The micro communicates with the EEPROM using a three wire interface that is identical (but separate) to the interface used for the audio chips. In this case, the clock line is the EE_CLK signal, port P03, and the data line is the EE_DATA signal, port P04. Although this data is also sent using the I2C format, the EEPROM is busy enough to have its own interface (rather than sharing the audio chip’s interface).

THEORY OF OPERATION

3.0 Control Electronics (continued)

The micro monitors messages from the RF remote control with input port P30 (RF_DATA). RF receiver module RR100 demodulates the signals received on the CD-20’s remote antenna (the digital ground conductor in the audio output cables) and converts it into a low-level AC signal. This signal is filtered and converted to TTL levels by one-half of comparator U402 before it is fed to the micro.

Key closures are detected by means of the micro’s on-chip A/D converter. When a console key is pressed, the voltage divider formed by R419 and R420 is changed by the switch being pushed. Specifically, a new resistor will be shunted across either R419 or R420. This increases or decreases the voltage at the micro sense lines, KEY_IN1, KEY_IN2 or KEY_IN3 (note that the keys are divided into 3 groups of 4 keys each). The micro examines these sense lines and determines which key is pressed based on the voltage it measures. If the micro measures a voltage of about 2.5 volts, it knows no key is pressed within that particular group of 4.

The AC power status is monitored by the micro using port P10, pin 1 of U400 (PFAIL/). When the AC input voltage to the wall transformer falls, its AC output voltage falls below the nominal 12V. When the voltage falls below a certain point (about 88 VAC in FM mode, about 93 VAC in CD mode), the DETECT line from the power supply (which monitors the raw DC input voltage to the +5V regulator, U1) causes comparator U402’s output to go low. This warns the micro that the power is failing, and it responds by shutting the system down (muting the speaker outputs, blanking the display, etc.). When AC power is OK, U402’s output (PFAIL/) is high.

4.0 Audio Electronics (Schematic Diagram Sheet 2) The CD-20 has 2 internal audio sources (CD and tuner) and four external sources (Tape, Aux,

Video 1 and Video 2). All of the sources get routed through audio matrix chip U101. This IC controls which zone(s) the sources will be connected to. The chip has three left and right outputs. One is used for Zone 1, two for Zone 2, and three for the tape outputs. The micro instructs the chip to connect each of the outputs to the correct input by using the clock and data lines as described above. If a zone is not active (or muted), the audio matrix chip may connect that output to an internal reference rather than one of the inputs for extra muting. The matrix has internal buffer amps, allowing its outputs to be used directly as the Zone 1 and 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. This means that any tape deck connected to the Tape outputs would record the same source that is being played on Zone 1. However, if the Tape input is selected for Zone 1, the Tape outputs are muted by the micro to prevent a feedback loop.

The first two matrix chip outputs (pins 12 through 15), as described, are then fed to Zone 1 and Zone 2 volume control ICs (U100 and U102 respectively). Each IC contains the volume-control cell, output-buffer cell and output mute cell for that particular zone. Volume settings, mute settings and output-buffer switching are all controlled by the micro using the ACLOCK, ADATA_1 (for Zone1) and ADATA_2 (for Zone2) lines. The final LR audio outputs (called the “adjustable outputs,” after volume control and muting) are pins 24 and 25. From here, the audio passes through DC blocking capacitors C114, C214, C124 and C224 (the volume control ICs run on a single +10V supply, so the audio has a 5 Vdc offset component) before running to output circular DIN connectors J101A and J101B.

THEORY OF OPERATION

4.0 Audio Electronics (continued)

Each of the volume control chips has two independently mutable outputs. The #1 outputs are used for the speakers (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. The microprocessor monitors the HP_SENSE line from the headphone jack to tell if headphones are plugged in. When they are, the micro mutes the #1 outputs from the Zone 1 volume chip (to the speakers), and unmutes the #2 outputs (to the headphones). The opposite occurs when headphones are unplugged. The headphone signals are buffered by U104 in order to drive the required 32 Ω loads.

Audio from the CD player typically contains a great deal of motor noise. This noise occurs because of ground conductor voltage drops on the ribbon cable connecting to the mechanism. To eliminate this motor noise, op-amp U103 has been configured as a differential amplifier. Any motor noise signals on the left and right audio lines are also on the ground reference line, pin 2 of the CD ribbon cable (pin 2 of connector J110). Therefore, U103 eliminates this commonmode component without affecting the actual audio (which is purely a differential-mode component). At the same time, U103 provides the necessary gain for the CD signal.

5.0 Tuner Electronics (Schematic Diagram Sheet 4) The FM antenna signal comes in through F connector J301 and enters the FM front-end

module (U301). U301 contains a tuned RF amplifier, the FM local oscillator, and the first mixer. The 10.7 MHz IF output signal appears on pin 4 and is passed through a 10.7 MHz ceramic filter (CF300). The filter's output is amplified by the first IF gain stage. This stage consists of Q307, Q308 and their associated components. The signal is then passed through a second ceramic filter (CF301), a second gain stage (Q309, Q310, etc.) and a third ceramic filter (CF302). These filter stages reject unwanted FM stations and noise.

The output of the final ceramic filter is fed into the main detector IC (U300). This device contains a second mixer, the FM detector, FM stereo MPX decoder, stop-level detection, as well as most of the AM circuitry. U300 further amplifies the IF signal and then performs FM detection using a double tuned quadrature detector formed by T303 and T304. T304 is adjusted for FM center frequency by adjusting it for 0 VDC between the AFC terminal (pin 4, U300) and the VREG terminal (pin 28, U300). T303 is adjusted for minimum distortion. (These two adjustments are interactive, so a few repetitions may be required.) The recovered audio appears on pin 8 of U300.

The recovered audio is filtered by C326 and the associated components and fed back into U300 on pin 9. U300 performs the FM stereo MPX decoding and outputs the decoded L and R channels (when FM is selected) on pins 14 and 15. The separation is controlled by the resistance from pin 12 to ground. The PLL decoder is clocked by 456 kHz resonator X300. The PLL loop filter components are connected to pin 11. The FM stop level is set by the variable resistance R349 on pin 30 and is nominally set to 33 dBf.

The signals are buffered and amplified by op-amp U303 and its associated components. Components R301, C302, R305, and C303 perform FM de-emphasis. MPX filters T301 and T300 remove any unwanted out-of-band signals.

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. The tuned output appears on pin 12 and is fed to the AM buffer FET transistor Q303. The buffered output is sent to pin 27 of U300 which contains the AM RF amplifier, mixer, IF amplifier, AM detector, and AM stop level detection. The AM stop level is set by the variable resistor R348 on pin 16 and is nominally set at 70 dBuV/m. The AM IF output signal appears on pin 26. This signal is filtered by the IF filter T306 and fed back into the chip on pin 24 for AM detection. The AM detected output appears on pin 5 where it is filtered by C327, R328 and C328. The filtered output is fed back into U300 on pin 6 where it is sent to the L and R outputs (when AM is selected), pins 14 and 15.

The AM and FM local oscillators are controlled by the PLL IC (U302). This device is instructed by the micro to select either AM or FM and to tune to a particular frequency. The PLL reference oscillator is clocked by a 7.2 MHz crystal (X301). This frequency is divided down to 400 kHz and then appears on pin 7. U302 divides down the Local Oscillator (LO) frequency and compares it to an internal reference frequency. An error signal from the comparison appears on pin

18. This error signal is integrated and filtered by Q304, Q305, and associated components. This produces the tuning voltage which appears at the collector of Q304.

The tuning voltage is filtered by R312, C316, R311, and C309 and fed to pin 14 of the AM front end (T302). Here it is used to vary the capacitance of 2 varactor diodes. The first diode adjusts the frequency of the AM local oscillator. The second tunes the AM RF input section to the desired frequency. Similarly, in FM mode, the tuning voltage is filtered by R316 and C321 and fed to the FM front end. As in the AM case, the FM front end uses this voltage to vary the LO frequency and to tune the RF input sections.

THEORY OF OPERATION

Figure 1. CD-20 Block Diagram

DISASSEMBLY/ASSEMBLY PROCEDURES

Note: Refer to Figures 2 and 3 for the

following procedures. Numbers in parentheses correspond to the item callouts in Figures 2 and 3.

1. Top Cover Removal

1.1 Grasp the cover (1) by the edges and

work it up to release the christmas tree fasteners from the superstructure (2). This might take some effort. Using a flatblade screwdriver may be helpful. Take care not to damage the top cover.

2. Top Cover Replacement

2.1 Align the cover's christmas tree fasten-

ers with the holes in the superstructure (2). Push the cover (1) down until it is fully seated. Note: Align the cover so that the BOSE logo is in the left corner.

3. Display Window Removal

3.1 Grasp the top edge of the display window (3) and pull it forward.

4. Display Window Replacement

5.4 Remove the three screws (4) from the

superstructure.

5.5 Place a flat-blade screwdriver into each of the four slots (5) on the superstructure and push away from the center of the unit to release the catches.

5.6 Lift the superstructure away from the base (9).

6. Superstructure Replacement

6.1 Lower the superstructure (2) onto the

base (9) and pull the ribbon cable through the large opening.

6.2 Push down on the superstructure (2) until it snaps into the base (9).

6.3 Redress the ribbon cable in the channel at the rear of the superstructure (2). Connect the cable to the PCB.

6.4 Replace the three screws (4) that secure the superstructure to the base.

6.5 Replace the door spring (7) to the superstructure and door assembly (8).

4.1 Align the display window (3) so the catches are facing up.

4.2 Align the display window with the LCD and press it into the superstructure (2).

5. Superstructure Removal

5.1 Perform procedures 1 and 3.

5.2 Remove the door spring (7) from the superstructure (2) and door assembly (8).

5.3 Remove the ribbon cable (6) from the

super structure and disconnect it from the PCB (18). Note: Make a note of how the ribbon cable was dressed in the rear channel of the superstructure.

6.6 Perform procedures 2 and 4.

7. Door Assembly Removal

Note: Refer to Figure 3 for the following

procedures.

7.1 Perform procedure 5.

7.2 Lift the door assembly (8) straight up.

8. Door Assembly Replacement

8.1 Lower the door assembly (8) into the

base (9) aligning the post (10) on the door assembly to the holes (11) in the base. Also rotate the hinge (12) on the left side of the door so that the groove fits into the slot on the hinge holder (13).

8.2 Perform procedure 6.

DISASSEMBLY/ASSEMBLY PROCEDURES

9. CD Mechanism Removal

9.1 Perform procedure 5.

9.2 Lift the CD mechanism (14) straight up

from the base (9).

10. CD Mechanism Replacement

10.1 With the opening of the CD mecha-

nism facing towards the front of the unit, lower the CD mechanism into the base (9) aligning the four grommets (15) with the four posts on the base (two not shown). Note: Make sure the four springs (16) are located on the four outer posts of the base.

10.2 Perform procedure 6.

11. Control Panel Removal

11.1 Perform procedure 5.

14. PCB Assembly (Disassemble)

14.1 The power supply PCB (21) and the

tuner PCB (22) are plugged into the main PCB (23). Grasp the power supply PCB or the tuner PCB and pull in an outward direction from the main PCB.

15. PCB Assembly (Assemble)

15.1 Connect the power supply (21) and

the tuner PCB (22) to the main PCB by plugging them into the main PCB (23) via connectors: J3 and J4 on the power supply PCB, J306 and 307 on the tuner PCB. Tabs on the tuner and power supply PCB lock into slots on the display PCB (24) to create a mechanical support.

16. PCB Assembly Replacement

11.2 Grasp the top edge of the control panel (17) and pull it forward.

12. Control Panel Replacement

12 1 Tilt the control panel (17) forward and

place it into the base (9) so that the lower edge of the control panel is in front of the catches on the base. Tilt the control panel towards the rear of the base until the control panel snaps into place.

13. PCB Assembly Removal

13.1 Perform procedure 5.

13.2 Grasp the PCB assembly (18) and lift

it straight up.

13.3 The RCA jack PCB (19) and the headphone PCB (20) are wired to the PCB assembly. Lift the RCA Jack PCB and the headphone PCB straight up.

16.1 While lowering the PCB assembly (18) into the base (9), angle it so that the RCA jacks protrude out the rear of the base.

16.2 Insert the RCA Jack PCB (19) into the holes in the base marked “TAPE IN, TAPE OUT”. The superstructure (2) will give mechanical support to the RCA Jacks.

16.3 Insert the headphone PCB (20) with connector J612 up, into the slot.

16.4 Redress all wires.

Note: When removing the PCB, make a

note of the wire dressing for reinstallation.

Figure 2. Disassembly/Assembly View

HINGE

Figure 3. Exploded View of Door

FRONT VIEW HINGE HOLDER

RC-20 REMOTE DISASSEMBLY/ASSEMBLY

Note: Numbers in parentheses correspond

to the callouts in Figure 4.

1. Enclosure Disassembly

1.1 Slide off the battery compartment door (5) and remove the batteries.

1.2 While holding the top cover (4) with one

hand, place your fingers from your other hand in the battery compartment and grasp the lower part of the bottom cover (3) with your finger tips.

1.3 With your finger tips in the battery compartment, first pull parallel to the unit then pull perpendicular.

1.4 With the catches released at the bottom, work your fingers up the sides to release the rest of the catches.

2. Enclosure Assembly

2.1 Lower the bottom cover (3) onto the top

cover (4) so that the bottom cover's lip fits over the top cover.

2.2 Press the top cover and bottom cover together until they snap into place.

3. PCB Removal

3.1 Lift the PCB (1) straight up. The

springs will come up with the PCB.

4. PCB Replacement

4.1 Lower the PCB (1) into the bottom

cover (3) so that the springs are in the battery compartment.

5. Pad Removal

5.1 The pad (2) is not secured. Grasp a

corner of the pad and lift it out.

6. Pad Replacement

6.1 Lower the pad (2) into the top cover

(4) so that the buttons line up with the holes in the top cover.

CATCHES

Figure 4. RC-20 Disassembly/Assembly View

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 remaining connectors.

2. Base Chassis Disassembly

2.1 Remove all the FPCs that connect the mount chassis (A173) to the main PCB.

2.2 Remove the front and rear elevator tension spring (A59).

2.3 Remove the two E-rings located in the rear (A238) and the two located in the front (A241). Remove the two E-rings located in

the front (A235) and the two located in the rear (A236). Remove the link cross bars

(A107) and (A111).

2.4 Remove the screw (A133) and the two

screws (A131) that mount the elevator unit and remove the elevator unit. Note: A133 is the screw that secures the plastic piece.

2.5 Remove the six screws (A61) that secure the top base chassis (A14).

2.6 Remove the two screws (A63) and the two screws (A64) that secures the rear base chassis (A22). Remove the spring that connects from the mount chassis to the base chassis. Note: Use caution when removing the mount chassis so that the washers, rollers, etc. that are mounted on the lift pin of the mount chassis are not lost. (Continued on the next page)

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.

3.2 Remove the screw (A133) that secures

the elevator unit. Note: A133 is the screw that secures the plastic piece.

3.3 Remove the two screws (A131) that secure the elevator unit to the base chassis and remove the elevator unit. Lift the elevator unit out through the bottom of the base chassis.

3.4 Remove the FPC (A104) from the motor (A127) terminal with a soldering iron.

3.5 Remove the screw (A130) that secures the elevator motor bracket (A115) to the elevator unit bracket.

3.6 Remove the two screws (A132) that secure the motor to the motor bracket.

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). Lift the motor up.

5. Loading Motor Disassembly

5.1 Unplug the FPCs (A104) and (A232).

5.2 Remove the four screws (A64) that

secure the base chassis side (A19) to the base chassis.

5.3 Remove the screw (A133) that secures the elevator unit to the chassis. Remove the base chassis side (A19). The elevator unit will be attached to the base chassis side.

5.4 Remove the two screws (A246) that secure the loading motor unit to the base chassis.

5.5 Remove the FPC (A232) that is connected to the motor terminal with a soldering iron.

5.6 Remove the two screws (A242) that secure the motor (A233) to the motor mount. Note: Assemble in the reverse order of the disassembly and make note of the following.

1. Make sure the front bend of the friction gear arm assembly (A197) is inserted in the square hole of the chassis mount

(A173).

2. Make sure that the PR cam roller (A223)

is fitted to the push cam rod (A215) and is inserted in the bend groove of the push rod

(A221).

3. The tightening torque of the motor

mounting screw (A242) is 1.5 to 2.0 kg-cm.

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 assembly section up. Remove the two screws (A157) that secure the motor bracket to the assembly. Note: Rotate the worm gear A148 until the disc rollers are in contact.

6.5 Remove the E-ring (A156) and the washer (A166) that secures the worm gear to the motor shaft.

6.6 Remove the screw (A158) that secures the motor to the motor bracket.

7. Pick Up Disassembly

7.1 Short the short pattern located on the

FPC (A1) with a soldering iron. Unplug the FPC (A1).

7.2 Remove the screw (A101) that secures the FPC to the chassis. Make note of the location of the FPC that is glued to the chassis.

7.3 Remove the two screws (A96) that secure the screw clip (A78), DV plate spring (A86) and DV spring holder (A76) to the pick up (A87).

7.4 Remove the screw (A97) that secures the switch spacer to the chassis.

7.5 Remove the two screws (A93) that secure the sub shaft (A73) of the pick up to the chassis. Lift the pick up out of the unit.

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.

8.2 With the disc unclamped, rotate the L wheel worm gear (A212) in the direction of the arrow to return the disc to the magazine. Note: If the disc comes in contact with the separator and can not be returned, push the edge of the disc up or down so that it returns without coming into contact with the separator of the magazine.

8.3 After returning the disc to the magazine, push the emergency eject plate (A51) with the tip of a screwdriver to remove the magazine.

TEST PROCEDURES

General Test Setup

Use cable 184209 for fixed level tests. Use cable 183174 for adjustable level tests. The miniature switch number 8 on the remote must be up to control ZONE 2.

For ZONE 1 and 2 variable tests, adjust the volume to max.

Terminate the Headphone output into 32Ω. Terminate all Audio outputs into 10KΩ. Terminate the serial output jack (tip and

ring) into 10kΩ (two resistors). See Figure 5 for adjustment locations.

1. Aux Gain and Separation Test

1.1 Apply a 2 Vrms, 1 kHz signal to the left

AUX input.

1.2 Ground the TAPE, VIDEO 1, VIDEO 2 and right AUX inputs.

1.3 Reference a dB meter to the applied signal.

1.4 Measure the gain according to the chart below.

Note: Repeat this test for the right channel.

OUTPUT MIN dB MAX dB

Zone 1 L Fixed -1.5 1.0

Zone 1 L Adjustable -1.5 1.0

Zone 2 L Fixed -1.5 1.0

Zone 2 L Adjustable -1.5 1.0

Tape L -1.5 1.0

Headphone L -- -50

Zone 1 R Fixed -- -50

Zone 1 R Adjustable -- -50

Zone 2 R Fixed -- -50

Zone 2 R Adjustable -- -50

Tape R -- -50

Headphone R -- -50

2. Video Gain And Separation Test

2.1 Apply a 2 Vrms, 1 kHz signal to the left

VIDEO 1 input.

2.2 Ground the TAPE, VIDEO 2, AUX and right VIDEO 1 inputs.

2.3 Reference a dB meter to the applied signal.

2.4 Measure the gain according to the following chart.

Note: Repeat this test for the right channel and VIDEO 2.

OUTPUT MIN DB MAX

Zone 1 L Fixed -1.5 1.0

Zone 1 R Fixed -- -50

Zone 2 L Fixed -1.5 1.0

Zone 2 R Fixed -- -50

Tape L -- -50

3. Tape Gain and Separation Test

3.1 Apply a 2 Vrms, 1 kHz signal to the left

TAPE input.

3.2 Ground the VIDEO 1, VIDEO 2, AUX and right TAPE inputs.

3.3 Reference a dB meter to the applied signal.

3.4 Measure the gain according to the chart below.

Note: Repeat this test for the right channel.

OUTPUT MIN dB MAX dB

Zone 1 L Fixed -1.5 1.0

Zone 2 L Fixed -1.5 1.0 Zone 1 R Fixed -- -50 Zone 2 R Fixed -- -50

TEST PROCEDURES

4. Volume Control Mute Test

4.1 Apply a 2 Vrms, 1 kHz signal to the

AUX input.

4.2 Set the volume control to maximum.

4.3 Reference a dB meter to ZONE 1

adjustable output.

4.4 Set the volume control to minimum and measure ZONE 1 output (should be ≤ -80 dB).

5. Distortion Test

5.1 Apply a 1 Vrms, 1 kHz signal to the

AUX input (Volume at full).

5.2 Measure the distortion at ZONE 1 and ZONE 2 (should be ≤ .05% A-weighting).

6. Frequency Response Test

6.1 Apply a 1 Vrms, 20Hz signal to the AUX

input (Volume at full).

6.2 Reference a dB meter to the applied signal.

7.3 While adjusting the volume up or down, the voltage at the tip should be ≥ .6 VDC.

8. FM Alignment

8.1 Select FM and tune to 98.1 MHz. Inject

an RF signal into the FM antenna terminals at 40 dBf, mono modulation, pilot off.

8.2 Front End Mixer Coil Adjustment: Connect a DC meter to U300, pin 25. Adjust the FM front end mixer coil for maximum DC voltage (should be within +0, -20 mV of peak value). Note: The front end mixer coil is located in the front end module (it is the only adjustable coil).

Note: Do not perform the following test for PCB 250736.

8.3 FM Detector Zero adjustment: Connect a DC meter to the positive (+) side of C315 and the positive (+) side of C313. Adjust T304 for 0 Vdc ± 110mV.

8.4 FM Distortion adjustment: Adjust T303 for minimum distortion (viewed at tape output).

6.3 Measure ZONE 1 and ZONE 2 output (should be ± 1 dB).

6.4 Apply a 1 Vrms, 20 kHz signal to the AUX input.

6.5 Reference a dB meter to the applied signal.

6.6 Measure ZONE 1 and ZONE 2 output (should be ± 1 dB).

7. Serial Data Interface Port

7.1 The voltage at the ring of the serial data

jack should be ≥ 4.5 VDC.

7.2 The voltage at the tip of the serial data jack should be ≤ 0.8 VDC.

8.5 FM distortion should be < .6%. If the distortion is out of spec, repeat 8.3 and

8.4. Recheck FM distortion.

9. FM Stereo Separation

9.1 Inject an RF signal into the FM antenna terminal at 65 dBf, L only modulation, pilot on.

9.2 Connect a dB meter to the left TAPE output. Reference the dB meter to this point.

9.3 Connect the dB meter to the right TAPE output. The output should be ≤ -25 dB.

TEST PROCEDURES

10. FM Stop Level Adjustment

Note: Do not perform the following test for

PCB 250736.

10.1 Inject an RF signal into the FM antenna ternimals at 25 dBf, L+R modulation, pilot off, set to 98.1 MHz.

10.2 Connect a DC meter to pin 21 of U300.

10.3 Rotate R439 counterclockwise until the voltage becomes less than 2.5V, then clockwise until the voltage becomes greater than 2.5V. The correct adjustment is when the voltage just becomes sightly greater than 2.5V.

10.4 Increase the RF generator to dBf and confirm that the voltage at pin 21 U300 is less than 2.5V.

11. FM Sensitivity / SNR

12.4 Tune the generator and the unit to

1080 kHz. Adjust the brown slug of T302 for maximum output.

12.5 Repeat steps 12.3 and 12.4 until maximum output is obtained.

13. AM Sensitivity

13.1 Inject an RF signal, 1080 kHz, at a

field strength of 70 dBu to the AM antenna terminals.

13.2 Connect a dB meter to the TAPE output and reference it to this point.

13.3 Remove the RF signal and measure the TAPE output (should be ≤ - 30 dB).

14. AM Stop Level adjustment

14.1 Inject an RF signal at a field strength

of 59 dBu to the AM antenna terminal.

11.1 Inject an RF signal into the FM antenna terminals at 42 dBf, L=R modulation, pilot on.

11.2 Connect a dB meter to the TAPE output. Reference the dB meter to this point.

11.3 Turn the modulation off and measure the output. The output should be ≤ -50 dB for US versions and ≤ -45 dB for European versions.

12. AM RMS

12.1 Inject an RF signal at a field strength

of 70 dBu into the AM antenna terminals.

12.2 Connect an AC meter to the tape output.

12.3 T une the generator and the unit t 630 kHz. Adjust the black slug of T302 for maximum output. The output should be ≥ 300 mVrms.

14.2 Connect a DC meter to pin 21 of U300.

14.3 Rotate R348 counterclockwise until the voltage becomes less than 2.5V, then clockwise until the voltage becomes greater than 2.5V. The correct adjustment is when the voltage just becomes slightly greater than 2.5 VDC.

14.4 Increase the generator output to 64 dBu and confirm the voltage at pin 21 of U300 is less than 2.5V.

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

ABEX test disc TCD-725A Defect tracking (void), 1.0 mm Track 6, 6 sec. ABEX test disc TCD-725A Defect tracking (black dot), .8 mm Track 9, 8 sec. ABEX test disc TCD-725A Defect tracking (finger print), 65 µm Track 13, 10 sec. ABEX test disc TCD-732R Defect tracking (warped disc), -1.0 mm First and last track, 6 sec. ABEX test disc TCD-713R Defect tracking (eccentric disc), 210 µm First and last track, 6 sec.

TEST PROCEDURES

PCB 178335

PCB 199827

PCB 250736

Figure 5. Tuner Alignment Locations

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.

Adjust C14 until the output at TP22 is peaked ( ≥ 6Vpp). It doesn't matter which peak you tune to.

1.5 TP19 should be 3 Vpp. TP20 should be 1 Vpp.

Figure 6. RC-20 Tuning Locations

ALIGNMENT PROCEDURES

Note: The CD changer must be placed into

a CD-20 music center for the following procedures. The CD changer cannot be operated by itself.

Equipment Needed

1. CD-20 Alignment Fixture (P/N: 191749)

2. Oscilloscope

3. DC Voltmeter

4. Test CD (A•Bex TCD-784) or equivalent. Note: Remove the solder from the location

ATSC before performing any alignments. Perform these procedures in exact order!

1. FE Bias Alignment

1.1 Connect the power pack to the CD-20

and leave the CD-20 in the OFF mode.

1.2 Connect a DC voltmeter to TP824 (FE out) and TP704 (1/2 Vcc). See Figure 1.

1.3 Adjust the potentiometer PT824 until the meter reads < 10mVdc.

2. Tracking Balance Alignment

TP601

Changer PCB

TP704

CN902

ATSC

TP824

PT824

CN903

Figure 1. FE Bias Alignment

Changer PCB

TP705

Sled

TP704

Track

PT823

TP822

CN902

DC Voltmeter

Oscilloscope

2.1 Insert the CD A•Bex TCD-784 and play track number seven.

2.2 Connect TP601 (TEST) to TP705 (GND). See Figure 2.

2.3 Remove the solder from the points labeled SLED and then TRACK.

2.4 Connect an oscilloscope to TP822 (+) and TP704 (-).

2.5 Adjust PT823 (T.BAL) until the wave form is symmetrical about 0VDC, V1=V2. See Figure 5.

2.6 After the adjustment is done, solder the points labeled TRACK and SLED. Remove the connection from TP601 (TEST) to TP705 (GRN).

CN903

Figure 2. Tracking Balance Alignment

Changer PCB

TP701

TP704

CN902

CD-A

GND

V+

F 1.75kHz

T 2.15kHz

CD-B

POWER

SCOPE

CD20

ALIGNMENT

FIXTURE

PT821

TP823

TP824

1/2 V

CN903

Figure 3. Focus Gain Alignment

ALIGNMENT PROCEDURES

3. Focus Gain Alignment

3.1 Unplug the power pack from the CD-20

3.2 Remove the solder from the point

labeled FE and connect the CD-20 alignment fixture as shown in Figure 3.

3.3 Turn the CD-20 on and play track number one of the A•Bex CD TCD-784.

3.4 Switch the CD-20 alignment fixture's oscillator to 1.75 kHz.

3.5 Set the oscilloscope to the X-Y mode and connect CH2 of the oscilloscope to the "X" input and CH1 to the "Y" input of the alignment fixture.

3.6 Adjust PT821 (F. GAIN) for the best circle as viewed on the oscilloscope. See Figure 6.

4.7 After the adjustment is complete, solder the point labeled TE.

5. Alignment Completion.

5.1 Solder the point labeled ATSC.

5.2 Perform test procedure 1.

Changer PCB

TP701

TP704

TP821 TP822

PT822

CN902

CN903

1/2 V

V+

GND

F 1.75kHz

T 2.15kHz

CD-A

CD-B

POWER

SCOPE

CD20

ALIGNMENT

FIXTURE

3.7 After the adjustment is complete, solder the point labeled FE.

4. Tracking Gain Alignment

4.1 Unplug the power pack from the unit.

4.2 Remove the solder from the point

labeled TE and connect the alignment fixture as shown in Figure 4.

4.3 Plug the CD-20 in and play track number 1 of the A•Bex CD TCD-784.

4.4 Switch the CD-20 alignment fixture's oscillator to 2.15 kHz.

4.5 Set the oscilloscope to the X-Y mode. Connect CH2 of the oscilloscope to the "X" input and CH1 to the "Y" input of the alignment fixture.

Figure 4. Tracking Gain Alignment

Figure 5. Symmetrical Waveform

Oscilloscope

V1=V2

4.6 Adjust PT822 (T. GAIN) for the best circle as viewed on the oscilloscope. See Figure 6.

Figure 6. X-Y Mode Output

10mV/ Division

PART LIST NOTES

1. This part is not normally available from Customer Service. Approval from the Field Service

Manager is required before ordering.

2. The individual parts located on the PCBs are listed in the Electrical Parts Lists.

3. This part is critical for safety purposes. Failure to use a substitute replacement with

the same safety characteristics as the recommended replacement part might create shock, fire and or other hazards.

4. The PCB assembly 199831-101C has a change to the AM circuit and uses a new AM antenna part number 199824-002. The PCB assembly 250737-101C has a change to the FM circuit in addition to the AM changes on the 199831-101C PCB. When replacing an older PCB assembly with either one of the PCBs (199831-101C, 250737-101C) the new AM antenna part number 199824-002 must be used with the new PCB assemblies.

5. These parts are not used on the 250737-101C PCB assembly.

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.

8. This part is used on the Japan variant.

9. This part is used on the Dual voltage variant.

10. The PCB part numbers 178349-101C and 199831-101C are no longer available. They

have been replaced by PCB part number 250737-101C. When ordering a new PCB assembly, use part number 250737-101C and order the new AM antenna, part number 199842-002. Due to design changes in the Am section of the PCB 250737-101C it is important to use the new AM antenna, part number 199824-002, for proper impedance matching.

MAIN PART LIST

(Refer to Figure 7)

Item

Number

1 COVER, TOP 180038 1 2 SCREW, TAPP, 6-13 X .875, PAN, XREC 187426-14 3 3 SUPERSTRUCTURE 182311 or 250257 1 4 PCB, ASSEMBLY 271911-101CK 1 1,4,

5 BASE ASSY 183889-001 1 6 SPRING, MOUNTING, CD-MECH 184041 4 7 CONSOLE, CONTROL 178211 1 8 BUTTON TREE 178339 1

9 SHIELD, BUTTON, ESD 180035 1 10 LENS 178208 1 11 DOOR ASSY. 180037 1 12 BEZEL, CHANGER 178210 1 13 CLIP, SPRING 199801 4 14 ADAPTER, MOUNTING, RIGHT 187576 1 15 GROMMET, MOUNTING 178919 4 16 CD MECHANISM 271835-001K 1 17 ADAPTER, MOUNTING, LEFT 187577 1 18 BUTTON, EJECT 197922 1

--- VIEWSHIELD 181090 1

--- CLIP,SPRING, U TYPE 178173-01 1

-- - SPRING, DOOR RETURN 178340 1

-- - SCREW, #4-24, HI-LO, PAN, HD. 184042-04 2

--- TAPE, EMI TRACE 179277 1

-- - SCREW, THUMB, SHIPP'G, CD MECH 198583 3

-- - CLIP, GROUNDING 183893 1

-- - CLIP, CHRISTMAS TREE 179278 4

--- TAPE, FOAM, ADH BACKED, W/LINER 179265-06 1

--- TAPE, TRANSFER (3M F9465PC) 183301-25100 1

--- TAPE, FOAM 179265-01 1

--- TAPE, FOAM 179265-02 1

U301 TUNER, SHIELDED, EURO 179270 1 5, 7, U301 TUNER, SHIELDED 181081 1 5

U301 TUNER, FM, 88.5 TO 108 MHz 251054 1 U301 TUNER, EURO 184589 1 7 U301 TUNER, JAPAN 188466-001 1 8 VFD BRACKET, VFD DISPLAY 178922 1 VFD400 DISPLAY, VFD. 179281 1 RR100 RECEIVER, RF REMOTE, 27.145 MHZ 148588 1 5 RR100 RECEIVER, RF REMOTE, 27.145 MHZ 191401-001 1 RR100 RECEIVER, RF REMOTE, 47.280 MHZ 193053-001 1 7, 9

Description Part

Number

Qty. Note

Figure 7. CD-20 Exploded View

CD MECHANISM PART LIST

(Refer to Figure 8)

Item

Number

1 Assy, Base Top Comp. 189092 2 Assy, Base Center Comp. 189108 3 Assy, Bracket CD-CH Comp. 189159 4 Assy, Chassis CD Comp. 189199 5 Assy, Base Rear Comp. 189155 6 Assy, Shaft EV Comp. 189160 7 Assy, Base Front Comp. 189193 8 Assy, Frame EV Comp. 189149

9 Assy, Base Side Comp. 189112 10 Assy, Chassis Mount Comp. 189157 11 Assy, Bracket Loading Comp. 189156

A1 FPC PIC 189154 A104 As sy, FPC Elevator 189161 A153 FPC Lift 189153 A228 Spring Tension DL 189144 A232 FPC Loading 189152

CN906 Wire Assy, 8P, 555mm 189162 2

- Assy, PCB-W, Main 189163 1

Note: 1. This is the complete CD changer mechanism PCB.

2. This part is connected to the CD changer mechanism's PCB.

Description Part

Number

Note

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 assembly that is outlined in Figure 8. Part numbers that are preceded by a letter represent individual parts called out in Figure 8.

Figure 8. CD Mechanism Exploded View

ELECTRICAL PART LIST

Resistors

Reference Designator Description Part Number Note

R1 82 OHM, 2512, 1W, 5% 181895-82R0 R2 7.5 OHM, 2512, 1W, 5% 181895-7R5 R11 130 OHM, 2512, 1W, 5% 181895-1300 6 R12 910 OHM, 1206, 1/8W, 5% 124895-9115 R14 2.0K, 2512, 1W, 5% 181895-2001 6 R14 2.7K, 2512, 1W, 5% 181895-2701 R18 330 OHM, 0805, 1/10W, 5% 133626-3315 R19 330 OHM, 0805, 1/10W, 5% 133626-3315 R22 2.2K, 0805, 1/10W, 5% 133626-2225 R23 220 OHM, 1206, 1/8W, 5% 124895-2215 R24 220 OHM, 1206, 1/8W, 5% 124895-2215 R25 4.7K, 0805, 1/10W, 5% 133626-4725 R26 910 OHM, 1206, 1/8W, 5% 124895-9115 R27 10.0K, 0805, 1/10W, 5% 133626-1035 R100 1.00K, 0805, 1/10W, 1% 133625-1001 R101 100K, 0805, 1/10W, 1% 133625-1003 R102 1.00K, 0805, 1/10W, 1% 133625-1001 R103 100K, 0805, 1/10W, 1% 133625-1003 R104 1.00K, 0805, 1/10W, 1% 133625-1001 R105 100K, 0805, 1/10W, 1% 133625-1003 R108 150 OHM, 0805, 1/10W, 1% 133625-1500 R110 150 OHM, 0805, 1/10W, 1% 133625-1500 R111 100K, 0805, 1/10W, 1% 133625-1003 R112 150 OHM, 0805, 1/10W, 1% 133625-1500 R113 100K, 0805, 1/10W, 1% 133625-1003 R116 150 OHM, 0805, 1/10W, 1% 133625-1500 R117 100K, 0805, 1/10W, 1% 133625-1003 R118 150 OHM, 0805, 1/10W, 1% 133625-1500 R119 100K, 0805, 1/10W, 1% 133625-1003 R120 39 OHM, 0805, 1/10W, 5% 133626-3905 R121 1.00K, 0805, 1/10W, 5% 133626-1025 6 R121 10.0K, 0805, 1/10W, 5% 133626-1035 R122 1.00K, 0805, 1/10W, 5% 133626-1025 6 R123 15 OHM, 0805, 1/10W, 5% 133626-1505 R127 1.00K, 0805, 1/10W, 5% 133626-1025 R128 15 OHM, 0805, 1/10W, 5% 133626-1505 R129 750 OHM, 0805, 1/10W, 1% 133625-7500 R130 15 OHM, 0805, 1/10W, 5% 133626-1505 R131 4.7K, 0805, 1/10W, 5% 133626-4725 R132 4.7K, 0805, 1/10W, 5% 133626-4725 R133 3.90K, 0805, 1/10W, 5% 133626-3925 R134 10 OHM, 0805, 1/10W, 5% 133626-1005 R135 2.2K, 0805, 1/10W, 5% 133626-2225 R136 750 OHM, 0805, 1/10W, 1% 133625-7500 R137 3.90K, 0805, 1/10W, 5% 133626-3925 R138 10 OHM, 0805, 1/10W, 5% 133626-1005 R139 2.2K, 0805, 1/10W, 5% 133626-2225 R140 330 OHM, 0805, 1/10W, 5% 133626-3315 R141 330 OHM, 0805, 1/10W, 5% 133626-3315 R142 51.1K, 0805, 1/10W, 0.1% 181896-5112 R143 220 OHM, 0805, 1/10W, 5% 133626-2215 R144 16.9K, 0805, 1/10W, 0.1% 181896-1692 R145 51.1K, 0805, 1/10W, 0.1% 181896-5112 R146 16.9K, 0805, 1/10W, 0.1% 181896-1692

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% 133625-1003 R164 100K, 0805, 1/10W, 1% 133625-1003 R165 100K, 0805, 1/10W, 1% 133625-1003 R166 330 OHM, 0805, 1/10W, 5% 133626-3315 R200 1.00K, 0805, 1/10W, 1% 133625-1001 R201 100K, 0805, 1/10W, 1% 133625-1003 R202 1.00K, 0805, 1/10W, 1% 133625-1001 R203 100K, 0805, 1/10W, 1% 133625-1003 R204 1.00K, 0805, 1/10W, 1% 133625-1001 R205 100K, 0805, 1/10W, 1% 133625-1003 R208 150 OHM, 0805, 1/10W, 1% 133625-1500 R210 150 OHM, 0805, 1/10W, 1% 133625-1500 R211 100K, 0805, 1/10W, 1% 133625-1003 R212 150 OHM, 0805, 1/10W, 1% 133625-1500 R213 100K, 0805, 1/10W, 1% 133625-1003 R216 150 OHM, 0805, 1/10W, 1% 133625-1500 R217 100K, 0805, 1/10W, 1% 133625-1003 R218 150 OHM, 0805, 1/10W, 1% 133625-1500 R219 100K, 0805, 1/10W, 1% 133625-1003 R242 51.1K, 0805, 1/10W, 0.1% 181896-5112 R243 220 OHM, 0805, 1/10W, 5% 133626-2215 R244 16.9K, 0805, 1/10W, 0.1% 181896-1692 R252 4.7K, 0805, 1/10W, 5% 133626-4725 R262 100K, 0805, 1/10W, 1% 133625-1003 R263 100K, 0805, 1/10W, 1% 133625-1003 R264 100K, 0805, 1/10W, 1% 133625-1003 R300 5.6K, 0805, 1/10W, 5% 133626-5625 R301 24K, 0805, 1/10W, 5% 133626-2435 R302 10 OHM, 0805, 1/10W, 5% 133626-1005 R303 5.6K, 0805, 1/10W, 5% 133626-5625 R304 2.2K, 0805, 1/10W, 5% 133626-2225 R305 24K, 0805, 1/10W, 5% 133626-2435 R309 2.2K, 0805, 1/10W, 5% 133626-2225 R311 22K, 0805, 1/10W, 5% 133626-2235 R312 4.7K, 0805, 1/10W, 5% 133626-4725 R313 10.0K, 0805, 1/10W, 5% 133626-1035 R314 10 OHM, 0805, 1/10W, 5% 133626-1005 5 R314 100 OHM, 0805, 1/10W, 5% 133626-1015 R315 4.7K, 0805, 1/10W, 5% 133626-4725 R316 1.00K, 0805, 1/10W, 5% 133626-1025 R317 1.60K, 0805, 1/10W, 5% 133626-1625 R318 620 OHM, 0805, 1/10W, 5% 133626-6215 R319 22 OHM, 0805, 1/10W, 5% 133626-2205 R320 9.1K, 0805, 1/10W, 5% 133626-9125 R321 4.7K, 0805, 1/10W, 5% 133626-4725 6 R321 47.0K, 0805, 1/10W, 5% 133626-4735 R322 1.2K, 0805, 1/10W, 5% 133626-1225 R323 33 OHM, 1206, 1/8W, 5% 124895-3305 R324 3.3K, 0805, 1/10W, 5% 133626-3325

ELECTRICAL PART LIST

Resistors (continued)

Reference Designator Description Part Number Note

R325 2.7K, 0805, 1/10W, 5% 133626-2725 5 R326 8.2K, 0805, 1/10W, 5% 133626-8225 5 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% 133626-1005 5 R330 51 OHM, 0805, 1/10W, 5% 133626-5105 R331 10.0K, 0805, 1/10W, 5% 133626-1035 5 R332 1.00K, 0805, 1/10W, 5% 133626-1025 R333 120 OHM, 0805, 1/10W, 5% 133626-1215 R334 330 OHM, 0805, 1/10W, 5% 133626-3325 5 R334 2.32K, 0805, 1/10W, 1% 133625-2321 R335 18.0K, 0805, 1/10W, 5% 133626-1835 5 R335 499 OHM, 0805, 1/10W, 1% 133625-4990 R336 390 OHM, 0805, 1/10W, 5% 133626-3915 6 R336 560 OHM, 0805, 1/10W, 5% 133626-5615 5 R336 2.32K, 0805, 1/10W, 1% 133625-2321 R337 330 OHM, 0805, 1/10W, 5% 133626-3325 5 R337 499 OHM, 0805, 1/10W, 1% 133625-4990 R338 22K, 0805, 1/10W, 5% 133626-2235 5 R338 330 OHM, 0805, 1/10W, 5% 133626-3315 R339 330 OHM, 0805, 1/10W, 5% 133626-3325 5 R339 2.32K, 0805, 1/10W, 1% 133625-2321 R340 18.0K, 0805, 1/10W, 5% 133626-1835 5 R341 390 OHM, 0805, 1/10W, 5% 133626-3915 6 R341 560 OHM, 0805, 1/10W, 5% 133626-5615 5 R342 330 OHM, 0805, 1/10W, 5% 133626-3325 5 R343 22K, 0805, 1/10W, 5% 133626-2235 5 R344 1.05K, 0805, 1/10W, 1% 133625-1051 R346 4.7K, 0805, 1/10W, 5% 133626-4725 R347 4.7K, 0805, 1/10W, 5% 133626-4725 R348 5K OHM, POT, RTRY, 30%, 1/2W 177494-203 6 R348 20K OHM, POT, RTRY, 30%, 1/2W 177494-502 R349 10K OHM, POT, RTRY, 30%, 1/2W 177494-103 6 R350 1.00K, 0805, 1/10W, 5% 133626-1025 R351 4.7K, 0805, 1/10W, 5% 133626-4725 R352 1.00K, 0805, 1/10W, 5% 133626-1025 R353 4.7K, 0805, 1/10W, 5% 133626-4725 6 R353 47.0K, 0805, 1/10W, 5% 133626-4735 R354 10.0K, 0805,1/10W, 5% 133626-1035 R355 6.80K, 0805, 1/10W, 5% 133626-6825 R357 10.0K, 0805,1/10W, 5% 133626-1035 5 R359 4.02K, 0805, 1/10W, 1% 133625-4021 R360 100 OHM, 0805, 1/10W, 5% 133626-1015 5 R360 2.32K, 0805, 1/10W, 1% 133625-2321 R361 100 OHM, 0805, 1/10W, 5% 133626-1015 5 R361 330 OHM, 0805, 1/10W, 5% 133626-3315 R362 100 OHM, 0805, 1/10W, 5% 133626-1015 5 R363 100 OHM, 0805, 1/10W, 5% 133626-1015 5 R401 100 OHM, 0805, 1/10W, 5% 133626-1015 R402 10.0K, 0805, 1/10W, 5% 133626-1035 R403 10.0K, 0805, 1/10W, 5% 133626-1035 R404 1.00K, 0805, 1/10W, 5% 133626-1025 R405 1.00K, 0805, 1/10W, 5% 133626-1025

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% 133626-1025 R413 1.00K, 0805, 1/10W, 5% 133626-1025 R414 2.7 OHM, 0805, 1/10W, 5% 133626-2R75 R415 100 OHM, 0805, 1/10W, 5% 133626-1015 R416 100 OHM, 0805, 1/10W, 5% 133626-1015 R417 2.7 OHM, 0805, 1/10W, 5% 133626-2R75 R418 2.7 OHM, 0805, 1/10W, 5% 133626-2R75 R419 1.00K, 0805, 1/10W, 5% 133626-1025 R420 1.00K, 0805, 1/10W, 5% 133626-1025 R421 43.2K, 0805, 1/10W, 1% 133625-4322 R422 43.2K, 0805, 1/10W, 1% 133625-4322 R423 10.0K, 0805, 1/10W, 5% 133626-1035 R424 10.0K, 0805, 1/10W, 5% 133626-1035 R425 10.0K, 0805, 1/10W, 5% 133626-1035 R426 10.0K, 0805, 1/10W, 5% 133626-1035 R428 1.00K, 0805, 1/10W, 5% 133626-1025 R429 1.00K, 0805, 1/10W, 5% 133626-1025 R430 10.0K, 0805, 1/10W, 5% 133626-1035 R431 10.0K, 0805, 1/10W, 5% 133626-1035 R432 43.2K, 0805, 1/10W, 1% 133625-4322 R433 511 OHM, 0805, 1/10W, 1% 133625-5110 R434 511 OHM, 0805, 1/10W, 1% 133625-5110 R435 100K, 0805, 1/10W, 1% 133625-1003 R436 33.0K, 0805, 1/10W, 5% 133626-3335 6 R436 4.7K, 0805, 1/10W, 5% 133626-4725 R437 33K, 0805, 1/10W, 5% 133626-3345 6 R438 30K, 0805, 1/10W, 5% 133626-3035 R439 10.0K, 0805, 1/10W, 5% 133626-1035 6 R439 1 MEG, 0805, 1/10W, 5% 133626-1055 R440 10.0K, 0805, 1/10W, 5% 133626-1035 6 R440 4.7K, 0805, 1/10W, 5% 133626-4725 R441 44.2K, 0805, 1/10W, 1% 133625-4422 R441 100K, 0805, 1/10W, 1% 133625-1003 6 R442 100K, 0805, 1/10W, 1% 133625-1003 R443 121K, 0805, 1/10W, 1% 133625-1213 R444 10.0K, 0805, 1/10W, 5% 133626-1035 R445 10.0K, 0805, 1/10W, 5% 133626-1035 R446 10.0K, 0805, 1/10W, 5% 133626-1035 R447 13K, 0805, 1/10W, 5% 133626-1335 8 R447 62.0K, 0805, 1/10W, 5% 133626-6235 6, 7 R447 7.5K, 0805, 1/10W, 5% 133626-7525 5, 9 R448 1.00K, 0805, 1/10W, 5% 133626-1025 R449 1.00K, 0805, 1/10W, 5% 133626-1025 R450 10.0K, 0805, 1/10W, 5% 133626-1035 R451 10.0K, 0805, 1/10W, 5% 133626-1035 R452 10.0K, 0805, 1/10W, 5% 133626-1035 R453 511 OHM, 0805, 1/10W, 1% 133625-5110 R454 511 OHM, 0805, 1/10W, 1% 133625-5110 R455 511 OHM, 0805, 1/10W, 1% 133625-5110

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 511 OHM, 0805, 1/10W, 1% 133625-5110 R462 511 OHM, 0805, 1/10W, 1% 133625-5110 R463 511 OHM, 0805, 1/10W, 1% 133625-5110 R464 511 OHM, 0805, 1/10W, 1% 133625-5110 R465 511 OHM, 0805, 1/10W, 1% 133625-5110 R466 511 OHM, 0805, 1/10W, 1% 133625-5110 R467 511 OHM, 0805, 1/10W, 1% 133625-5110 R468 511 OHM, 0805, 1/10W, 1% 133625-5110 R469 511 OHM, 0805, 1/10W, 1% 133625-5110 R470 511 OHM, 0805, 1/10W, 1% 133625-5110 R471 511 OHM, 0805, 1/10W, 1% 133625-5110 R472 511 OHM, 0805, 1/10W, 1% 133625-5110 R473 511 OHM, 0805, 1/10W, 1% 133625-5110 R474 511 OHM, 0805, 1/10W, 1% 133625-5110 R475 511 OHM, 0805, 1/10W, 1% 133625-5110 R476 1.00K, 0805, 1/10W, 5% 133626-1025 R477 1.00K, 0805, 1/10W, 5% 133626-1025 R500 1.00K, 0805, 1/10W, 1% 133625-1001 R501 1 MEG, 0805, 1/10W, 5% 133626-1055 R502 1.00K, 0805, 1/10W, 1% 133625-1001 R503 1 MEG, 0805, 1/10W, 5% 133626-1055 R504 100K, 0805, 1/10W, 1% 133625-1003 R505 100K, 0805, 1/10W, 1% 133625-1003 R700 43.2K, 0805, 1/10W, 1% 133625-4322 R701 43.2K, 0805, 1/10W, 1% 133625-4322 R702 43.2K, 0805, 1/10W, 1% 133625-4322 R703 43.2K, 0805, 1/10W, 1% 133625-4322 R704 43.2K, 0805, 1/10W, 1% 133625-4322 R705 43.2K, 0805, 1/10W, 1% 133625-4322 W300 JUMPER, CHIP, 0805 133627

Capacitors

Reference Designator Description Part Number Note

C1 .01uF, 100V, 20% 180630-103 C2 .01uF, 0805, X7R, 50V, 10% 133623-103 C3 470uF, EL, 85°C, 25V, 20% 149948-471E C4 .047uF, 0805, Z5U, 20% 148779-473 C5 .01uF, 0805, X7R, 50V, 10% 133623-103 C6 470uF, EL, 85°C, 25V, 20% 149948-471E C7 10uF, EL, 85°C, 25V, 20% 149947-100E C8 .01uF, 0805, X7R, 50V, 10% 133623-103 C10 2200uF, EL, 85°C, 25V, 20% 185929-222E C11 .01uF, 0805, X7R, 50V, 10% 133623-103 C12 .047uF, 0805, Z5U, 20% 148779-473 C13 .01uF, 0805, X7R, 50V, 10% 133623-103 C14 47uF, EL, 85°C, 25V, 20% 149948-470E C15 100uF, EL, 85°C, 50V, 20% 149948-101H 6 C15 470uF, EL, 85°C, 25V, 20% 149948-471E

ELECTRICAL PART LIST

Capacitors (continued)

Reference Designator Description Part Number Note

C16 .01uF, 0805, X7R, 50V, 10% 133623-103 C17 .01uF, 0805, X7R, 50V, 10% 133623-103 C18 100uF, EL, 85°C, 50V, 20% 149948-101H C19 .01uF, 0805, X7R, 50V, 10% 133623-103 C20 100uF, EL, 85°C, 50V, 20% 149948-101H C21 100uF, EL, 85°C, 50V, 20% 149948-101H C22 .01uF, 0805, X7R, 50V, 10% 133623-103 C23 47uF, EL, 85°C, 25V, 20% 149948-470E 6 C24 100uF, EL, 85°C, 50V, 20% 149948-101H C2 5 1000pF, 0805, COG, 50V, 5% 133622-102 C2 6 1000pF, 0805, COG, 50V, 5% 133622-102 C27 100uF, EL, 85°C, 50V, 20% 149948-101H C28 .01uF, 0805, X7R, 50V, 10% 133623-103 C29 .01uF, 0805, X7R, 50V, 10% 133623-103 C30 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C32 .01uF, 0805, X7R, 50V, 10% 133623-103 C33 .01uF, 0805, X7R, 50V, 10% 133623-103 C100 180pF, 0805, COG, 50V, 5% 133622-181 C101 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C102 180pF, 0805, COG, 50V, 5% 133622-181 C103 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C104 180pF, 0805, COG, 50V, 5% 133622-181 C105 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C107 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C108 10uF, EL, 85°C, 25V, 20% 149947-100E C110 10uF, EL, 85°C, 25V, 20% 149947-100E C111 1000pF, 0805, COG, 50V, 5% 133622-102 C112 .047uF, 0805, Z5U, 20% 148779-473 C114 10uF, EL, 85°C, 25V, 20% 149947-100E C115 1000pF, 0805, COG, 50V, 5% 133622-102 C116 1000uF, EL, 85°C, 16V, 20% 149948-102C C118 .047uF, 0805, Z5U, 20% 148779-473 C119 1000uF, EL, 85°C, 16V, 20% 149948-102C C120 .047uF, 0805, Z5U, 20% 148779-473 C122 10uF, EL, 85°C, 25V, 20% 149947-100E C123 1000pF, 0805, COG, 50V, 5% 133622-102 C124 10uF, EL, 85°C, 25V, 20% 149947-100E C125 1000pF, 0805, COG, 50V, 5% 133622-102 C126 .01uF, 0805, X7R, 50V, 10% 133623-103 C127 .01uF, 0805, X7R, 50V, 10% 133623-103 C128 .047uF, 0805, Z5U, 20% 148779-473 6 C129 .047uF, 0805, Z5U, 20% 148779-473 6 C130 470uF, EL, 85°C, 25V, 20% 149948-471E C131 2.2uF, 1206, Y5V, 16V, 80% 178212-225 C132 .01uF, 0805, X7R, 50V, 10% 133623-103 6 C132 100pF, 0805, COG, 50V, 5% 133622-101 C133 .01uF, 0805, X7R, 50V, 10% 133623-103 C134 .01uF, 0805, X7R, 50V, 10% 133623-103 C135 2.2uF, 1206, Y5V, 16V, 80% 178212-225 C136 2.2uF, 1206, Y5V, 16V, 80% 178212-225 C137 .047uF, 0805, Z5U, 20% 148779-473 C138 1000pF, 0805, COG, 50V, 5% 133622-102 C139 1000pF, 0805, COG, 50V, 5% 133622-102 C140 1000pF, 0805, COG, 50V, 5% 133622-102

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 6 C145 1000uF, EL, 85°C, 16V, 20% 149948-102C C146 100pF, 0805, COG, 50V, 5% 133622-101 C200 180pF, 0805, COG, 50V, 5% 133622-181 C201 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C202 180pF, 0805, COG, 50V, 5% 133622-181 C203 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C204 180pF, 0805, COG, 50V, 5% 133622-181 C205 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C207 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C208 10uF, EL, 85°C, 25V, 20% 149947-100E C210 10uF, EL, 85°C, 25V, 20% 149947-100E C211 1000pF, 0805, COG, 50V, 5% 133622-102 C214 10uF, EL, 85°C, 25V, 20% 149947-100E C215 1000pF, 0805, COG, 50V, 5% 133622-102 C216 1000uF, EL, 85°C, 16V, 20% 149948-102C C222 10uF, EL, 85°C, 25V, 20% 149947-100E C223 1000pF, 0805, COG, 50V, 5% 133622-102 C224 10uF, EL, 85°C, 25V, 20% 149947-100E C225 1000pF, 0805, COG, 50V, 5% 133622-102 C234 2.2uF, 1206, Y5V, 16V, 80% 178212-225 C235 2.2uF, 1206, Y5V, 16V, 80% 178212-225 C239 1000pF, 0805, COG, 50V, 5% 133622-102 C240 1000pF, 0805, COG, 50V, 5% 133622-102 C241 180pF, 0805, COG, 50V, 5% 133622-181 C244 180pF, 0805, COG, 50V, 5% 133622-181 C246 100pF, 0805, COG, 50V, 5% 133622-101 C300 4.7uF, EL, 85°C, 50V, 20% 149948-4R7H C301 .047uF, 0805, Z5U, 20% 148779-473 C302 22pF, 0805, COG, 50V, 5% 133622-220 6, 7 C302 3300pF, 0805, X7R, 50V, 10% 133623-332 C303 22pF, 0805, COG, 50V, 5% 133622-220 6, 7 C303 3300pF, 0805, X7R, 50V, 10% 133623-332 C304 4.7uF, EL, 85°C, 50V, 20% 149948-4R7H C305 10pF, 0805, COG, 50V, 5% 133622-100 C309 .047uF, 0805, Z5U, 20% 148779-473 C311 9.1pF, 0805, 50V, 5% 133622-9R1 C312 .047uF, 0805, Z5U, 20% 148779-473 C313 220uF, EL, 85°C, 25V, 20% 149948-221E C314 .047uF, 0805, Z5U, 20% 148779-473 C315 1.0uF, EL, 85°C, 50V, 20% 149948-1R0H C316 .01uF, 0805, X7R, 50V, 10% 133623-103 C317 .047uF,.0805, Z5U, 20% 148779-473 C318 100uF, EL, 85°C, 25V, 20% 149948-101E C319 .01uF, 0805, X7R, 50V, 10% 133623-103 C320 2.2uF, EL, 85°C, 50V, 20% 149947-2R2H C321 1.0uF, EL, 85°C, 50V, 20% 149948-1R0H C322 .047uF, 0805, Z5U, 20% 148779-473 C323 1.0uF, EL, 85°C, 50V, 20% 149948-1R0H C324 470pF, 0805, COG, 50V, 5% 133622-471 6, 7

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% 133623-332 C328 .047uF, 0805, Z5U, 20% 148779-473 C329 1.0uF, EL, 85°C, 50V, 20% 149948-1R0H C330 .33uF, BOX, 85°C, 50V, 5% 137127-334 C331 .047uF, 0805, Z5U, 20% 148779-473 C332 47uF, EL, 85°C, 25V, 20% 149948-470E C333 .047uF, 0805, Z5U, 20% 148779-473 C334 180pF, 0805, COG, 50V, 5% 133622-181 C335 47uF, 85°C, 16V, EL, 20% 178198-470C C336 .047uF, 0805, Z5U, 20% 148779-473 C337 .047uF, 0805, Z5U, 20% 148779-473 5 C338 1000pF, 0805, COG, 50V, 5% 133622-102 C339 .047uF, 0805, Z5U, 20% 148779-473 C340 .047uF, 0805, Z5U, 20% 148779-473 C341 .047uF, 0805, Z5U, 20% 148779-473 5 C341 1000pF, 0805, COG, 50V, 5% 133622-102 C342 .047uF, 0805, Z5U, 20% 148779-473 5 C343 10uF, EL, 85°C, 25V, 20% 149947-100E C344 .047uF, 0805, Z5U, 20% 148779-473 C345 .047uF, 0805, Z5U, 20% 148779-473 C346 4.7uF, EL, 85°C, 50V, 20% 149948-4R7H C347 .01uF, 0805, X7R, 50V, 10% 133623-103 C348 100pF, 0805, COG, 50V, 5% 133622-101 C349 1000pF, 0805, COG, 50V, 5% 133622-102 C350 .047uF, 0805, Z5U, 20% 148779-473 C351 47uF, EL, 85°C, 25V, 20% 149948-470E C352 .047uF, 0805, Z5U, 20% 148779-473 C353 27pF, 0805, COG, 50V, 5% 133622-270 C354 33pF, 0805, COG, 50V, 5% 133622-330 C355 .047uF, 0805, Z5U, 20% 148779-473 C356 .01uF, 0805, X7R, 50V, 10% 133623-103 C357 1000pF, 0805, COG, 50V, 5% 133622-102 C358 180pF, 0805, COG, 50V, 5% 133622-181 C359 180pF, 0805, COG, 50V, 5% 133622-181 C360 .01uF, 0805, X7R, 50V, 10% 133623-103 C361 180pF, 0805, COG, 50V, 5% 133622-181 C362 .047uF, 0805, Z5U, 20% 148779-473 C363 180pF, 0805, COG, 50V, 5% 133622-181 C364 180pF, 0805, COG, 50V, 5% 133622-181 C401 1uF, 1206, Y5V, 16V, 80% 173383-105 C403 .01uF, 0805, X7R, 50V, 10% 133623-103 C404 .01uF, 0805, X7R, 50V, 10% 133623-103 C405 .01uF, 0805, X7R, 50V, 10% 133623-103 C406 .1uF, 1206, Y5V, 50V, 80% 138551-104 C407 .1uF, 1206, Y5V, 50V, 80% 138551-104 C408 .1uF, 1206, Y5V, 50V, 80% 138551-104 C410 180pF, 0805, COG, 50V, 5% 133622-181 C411 180pF, 0805, COG, 50V, 5% 133622-181 C412 180pF, 0805, COG, 50V, 5% 133622-181 C419 39pF, 0805, COG, 50V, 5% 133622-390

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% 173383-105 C434 .047uF, 0805, Z5U, 20% 148779-473 C435 1uF, 1206, Y5V, 16V, 80% 173383-105 C436 4.7uF, EL, 85°C, 50V, 20% 149948-4R7H 6 C436 1000pF, 0805, COG, 50V, 5% 133622-102 C438 100pF, 0805, COG, 50V, 5% 133622-101 C439 1000pF, 0805, COG, 50V, 5% 133622-102 C440 1000pF, 0805, COG, 50V, 5% 133622-102 C441 100pF, 0805, COG, 50V, 5% 133622-101 C442 100pF, 0805, COG, 50V, 5% 133622-101

Diodes

Reference Designator Description Part Number Note

D1 DO-214AA, SMT, S1G 178380-4 D4 DO-214AA, SMT, S1G 178380-4 D6 DO-214AA, SMT, S1G 178380-4 D7 DO-214AA, SMT, S1G 178380-4 D8 1N4751, ZENER, 30V, 1W 116995-4751B 5 D8 ZENER, PSM, 1W 187734-30RA D9 DO-214AA, SMT, S1G 178380-4 D10 BAV99, DUAL, SOT-23 147239 D11 BAV99, DUAL, SOT-23 147239 D12 DO-214AA, SMT, S1G 178380-4 D13 1N5232, ZENER, 5.6V, 225mW 135247-5232 D14 DO-214AA, SMT, S1G 178380-4 D15 DO-214AA, SMT, S1G 178380-4 D105 MMBD914LT1, SOT 148582 D106 MMBD914LT1, SOT 148582 D107 MMBD914LT1, SOT 148582 D108 MMBD914LT1, SOT 148582 D300 MMBD914LT1, SOT 148582 D301 MMBD914LT1, SOT 148582 D404 MMBD914LT1, SOT 148582

ELECTRICAL PART LIST

**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.

Transistors

Reference Designator Description Part Number Note

Q 1 MMBT3904, NPN, SOT 146819 Q 2 MMBT3904, NPN, SOT 146819 Q10 2SB1136, PNP, TO-126 129002 Q1 1 MMBT3904, NPN, SOT 146819 Q101 BPLR, N, 50V, 100mA, SOT23 258024 ** Q102 BPLR, P, 60V, 200mA, TO-92 119168 Q103 BPLR, N, 50V, 100mA, SOT23 258024 ** Q104 BPLR, P, 60V, 200mA, TO-92 119168 Q105 2SA1341, P, 50V 258025 *** Q106 BPLR, N, 50V, 100mA, SOT23 258024 ** Q302 2SA1341, P, 50V 258025 *** Q303 JFET, N, 20V, 20mA, TO-92 148590-E Q304 MMBT3904, NPN, SOT 146819 Q305 JFET, N, 4 0V, 6mA, TO-92 147561-3 Q307 BPLR, N, 30V, 30mA, TO-92 147565 5 Q307 BPLR, N, 25V, 30MA, SOT-23 187601-001 Q308 BPLR, N, 30V, 30mA, TO-92 147565 5 Q308 BPLR, N, 25V, 30MA, SOT-23 187601-001 Q309 BPLR, N, 30V, 30mA, TO-92 147565 5 Q310 BPLR, N, 30V, 30mA, TO-92 147565 5 Q311 BPLR, P, 40V, 200mA, SOT23 148596 Q312 BPLR, N, 50V, 100mA, SOT23 258024 **

Integrated Circuits

Reference Designator Description Part Number Note

U1 VOLT REG, 5V, POS 172942-05 U2 VOLT REG, 10V, POS 136664 4/1/02 U100 TDA7313, VOL CONT, DIP28/SO28 177983 U101 AUDIO MATRIX, SO28 177984-2 U102 TDA7313, VOL CONT, DIP28/SO28 177983 U103 NJN3404AM, OP AMP 181080 U104 NJM4556, OP AMP, DUAL, SO-8 148598 U300 LA1851, DIGITAL TUNER, DIP-30 146815 U302 PLL FREQ SYNTH, DIP-20 147527 U303 NJN3404AM, OP AMP 181080 U400 TMP87XX0, uC, QFP80 199455-001 U401 24C01A, EEPROM 184044 U402 LM393, DUAL COMPARITOR, SO-8 148584 U403 DS1233-10, RESET, VOLTAGE SPV 181016-10

Inductors

Reference Designator Description Part Number Note

L1 SMT, LEM4532, 10uH 178370-100 L2 CHIP, 0805, 400 OHMS 188587-401 L100 SMT, LM4532, 1uH 178370-1R0 L101 SMT, LEM4532, 10uH 178370-100 L101 SMT, LEM4532, 100uH 178370-101 6 L300 1000uH, 40A, .796 Hz 147563-102 6 L300 INDUCTOR, AXIAL, 10%, 1mH 147563-102 L301 SMT, LEM4532, 100uH 178370-101 5 L302 SMT, LEM4532, 100uH 178370-101 5 L303 SMT, LEM4532, 100uH 178370-101 L400 SMT, LEM4532, 100uH 178370-101 L600 SMT, LEM4532, 100uH 178370-101 L601 SMT, LEM4532, 100uH 178370-101

ELECTRICAL PART LIST

Transformers

Reference Designator Description Part Number Note

CF300 FILTER, CER., 10.7MHz, 280 kHz 253037-001 6 CF300 FILTER, CER., 10.7MHz, 230 kHz 253037-002 CF301 FILTER, CER., 10.7MHz, 280 kHz 253037-001 6 CF301 FILTER, CER., 10.7MHz, 230 kHz 253037-002 5 CF302 FILTER, CER., 10.7MHz, 280 kHz 253037-001 6 CF302 FILTER, CER., 10.7MHz, 230 kHz 253037-002 5 CF302 FILTER, CER., 10.7MHz, 180 kHz 253037-001 T300 FILTER, STEREO MPX 147236 T301 FILTER, STEREO MPX 147236 T302 MODULE, TUNING, AM, FRONT END 172972 T303 DETECTOR, FM 147557 5 T303 DETECTOR, FM 147234 T304 C OIL, FM, DETECTOR 147564 5 T305 114 kHz, FTZ, FILTER 147558 7 T306 COIL, AM IF, HIGH SELECTIVITY 148581

Connectors

Reference Designator Description Part Number Note

J1 CONN, DC POWER JACK 147540 J2 CONN, SERIAL 178356 J3 HEADER, LOW CURRENT 10 POLE 133224-10 J4 HEADER, LOW CURRENT 6 POLE 133224-06 J5 CONN, HEADER, 4 POS 184038-04 J100 CONN, HOUSING, PHONO, 6 POS 148766 J101 CONN, DUAL, DIN 178355 J103 CONN, HEADER, JST 10JQST 178368-10 J104 CONN, HEADER, JST 6JQST 178368-06 J106 CONN, HEADER, JST 10JQST 178368-10 J107 CONN, HEADER, JST 6JQST 178368-06 J108 CABLE, 15 COND, FLEX, 24AWG 178366-15 J109 CABLE, 15 COND, FLEX, 24AWG 178366-15 J110 CONNECTOR, HEADER, 8 PIN 180045-08 or 271914-08 11/03 J112 CABLE, RIBBON, 2.5 mm, 165 mm 178365-04165 J114 CABLE, 28AWG, RIBBON, 179 mm 178363-05179 J300 CONN, AM ANTENNA 179266 J301 CONN, F TYPE, THREADED 178354 5 J301 CONN, F TYPE, THREADED 250785 J301 CONN, FM, EURO, PAL. 250786 J301 CONN, FM, EURO, PAL. 179271 6 J306 HEADER, LOW CURRENT 10 POLE 133224-10 J307 HEADER, LOW CURRENT 6 POLE 133224-06 J410 CABLE, RIBBON, 2.0 mm, 245 mm 178364-05245 J500 CONN, RCA, SINGLE, WHT 178357-1 J501 CONN, RCA, SINGLE, RED 178357-2 J502 CONN, RCA, SINGLE, WHT 178357-1 J503 CONN, RCA, SINGLE, RED 178357-2 J514 CABLE, 28AWG, RIBBON, 179 mm 178363-05179 J601 JACK, HEADPHONE, PCB MNT. 148583 J612 CABLE, RIBBON, 2.5 mm, 165 mm 178365-04165 J710 CABLE, RIBBON, 2.0 mm, 245 mm 178364-05245

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 S706 SWITCH, TACTILE DOME, 160gf 172999-02 S707 SWITCH, TACTILE DOME, 160gf 172999-02 S708 SWITCH, TACTILE DOME, 160gf 172999-02 S709 SWITCH, TACTILE DOME, 160gf 172999-02 S710 SWITCH, TACTILE DOME, 160gf 172999-02 S711 SWITCH, TACTILE DOME, 160gf 172999-02

Crystals

Reference Designator Description Part Number Note

X300 RESONATOR, CERAMIC, 456KHz 147233 X301 CRYSTAL, QUARTZ, 7.2MHz, 50PPM 147223 or 197680 11/02 X401 CRYSTAL, CERAMIC RESONATOR,

8MHz

175627

CATCHES

Figure 9. RC-20 Remote Exploded View

RC-20 REMOTE PART LIST

(Refer to Figure 9)

Item

Number

1 PCB Assembly 194386 1 1, 2 2 Pad, Switch, Remote, RC 20,

Audio

3 Cover, Bottom, Remote

Control

4 Cover, Top, Remote Control,

Universal

5 Door, Battery, Remote

Control

6 Contact, Battery, Cone 174001 1 7 Contact, Battery, Flat 174000 1 8 Contact, Battery, Cone/Flat 174002-01 1

9 Contact, Battery, Flat/Cone 174002-02 1 10 Spacer, Pad 173605 1 11 Polybag 144348 1

Description Part

Number

178379 1 146089 1 176190 1 146226 1

Qty Per

Assembly

RC-20 REMOTE ELECTRICAL PART LIST

Resistors

Note

Reference Designator Description Part Number Note

R1 200 k, 1/10W, 5% 133626-2045 R2 200 k, 1/10W, 5% 133626-2045 R3 200 k, 1/10W, 5% 133626-2045 R4 200 k, 1/10W, 5% 133626-2045 R5 200 k, 1/10W, 5% 133626-2045 R6 200 k, 1/10W, 5% 133626-2045 R7 200 k, 1/10W, 5% 133626-2045 R8 200 k, 1/10W, 5% 133626-2045 R9 430 OHM, 1/10W, 5% 133626-4315 R10 1.k, 1/10W, 5% 133626-1025 R11 47 OHM, 1/10W, 5% 133626-4705 R12 4.7 k, 1/10W, 5% 133626-4725 R13 100 k, 1/10W, 5% 133626-1045 R14 2.43 k, 1/10W, 1% 133625-2431 R15 4.7 k, 1/10W, 5% 133626-4725 R16 470 , 1/10W, 5% 133626-4715 R17 15 k, 1/10W, 5% 133626-1535 R18 5.6 k, 1/10W, 5% 133626-5625

RC-20 REMOTE ELECTRICAL PART LIST

Capacitors

Reference Designator Description Part Number Note

C 1 10 µF, 16v, 20% 177902-100C C 2 .047 µF, 50V, 20% 148779-473 C3 100 pF, 50V, 5% 133622-101 C4 100 pF, 50V, 5% 133622-101 C5 .047 µF, 50V, 20% 148779-473 C 6 1000 pF, 50v, 5% 133622-102 C 7 .01 µF, 50V, 10% 133623-103 C8 100 pF, 50V, 5% 133622-101 C9 56 pF, 50V, 5% 133622-560 C10 270 pF, 50V, 5% 133622-271 C11 .01 µF, 50V, 10% 133623-103 C13 22 pF, 50V, 5% 133622-220 C15 470 pF, 50V, 5% 133622-471 C16 470 pF, 50V, 5% 133622-471 C1 7 1000 pF, 50v, 5% 133622-102

Diodes

Reference Designator Description Part Number Note

D1 Switching, 75V, 200 mA 148582 D2 Switching, 75V, 200 mA 148582 D3 Switching, 75V, 200 mA 148582 D4 Dual, 75V, 300 mA 148774 D5 Dual, 75V, 300 mA 148774

Transistors

Reference Designator Description Part Number Note

Q1 Bipolar, P, 50V, 100 mA 146818 Q2 Bipolar, N, 50V, 100 mA 146817 Q3 Bipolar, P, 40V, 200 mA 148596 Q4 Bipolar, N, 30V, 30 mA 148781-4 Q5 Bipolar, N, 20V, 1.5 A 148780-7

Coils

Reference Designator Description Part Number Note

L1 10 µH, SMT, LEM4532 178370-100 L2 .22 µH, 10%, SMD 178336-R22K L3 10 µH, SMT, LEM4532 178370-100

Miscellaneous

Reference Designator Description Part Number Note

SW1 Switch, DIP, 8 CT, SMT 179280 U1 RC Transmitter 148784 X1 Resonator, Ceramic, 455 kHz 148782

PACKAGING PART LIST

Item

Number

1 PACKING, INSERT D/C CARD 188022 1

2 SCREW, SHIPPING, CD MECH. 198583 3

3 PACKING, TOP PAD, EPS 186424-001 1

4 PACKING, TRAY, EPS 186425-001 1

5 CARTON, D/C, CD-20 188020-001 1

-- - BAG, MICROFOAM, 18 x 10.5 174591 1

--- MAGAZINE, 6 DISC 256261 1

--- REMOTE 178915 1

Description Part

Number

Qty. Note

Figure 10. Packaging Exploded View

ACCESSORY PART LIST

Item

Number

1 POWER PACK, 100V

POWER SUPPLY, 120V POWER PACK, 220V, EURO POWER PACK, 230V, UK/SING. POWER PACK, 240, AUST.

Description Part

Number

178372 178371 178375 251773 178373

Qty. Note

2 REMOTE 187700 1 3 MAGAZINE, 6 DISC 263040 1 10/01 4 PACKING TRAY 190209-004 1 5 CARTON 190208-003 1 6 AM ANTENNA 199824-002 1 7 BATTERIES, AA 147538 3 8 LINE CORD, 120V

LINE CORD, 230V, EURO LINE CORD, 100V, JAPAN LINE CORD, 230V, UK/SING. LINE CORD, 240V, AUST.

9 ANTENNA, FM, DIPOLE, 75 OHM, F CONN

ANTENNA, FM, DIPOLE, PAL CONN

198603-001

148203 145316 134725 134726

148589 143185

Figure 11. Accessory Packaging

IC BLOCK DIAGRAMS AND PINOUTS

U101 Part Number 177984-2

IC BLOCK DIAGRAMS AND PINOUTS

U100, 102 Part Number 177938

IC BLOCK DIAGRAMS AND PINOUTS

U302 Part Number 147527

U300 Part Number 146815

CD MECHANISM IC BLOCK DIAGRAMS

IC 821 (CXA1782BQ) Servo Signal Processor RF Amplifier

CD MECHANISM IC BLOCK DIAGRAMS

Input Interface

Infinity

Zero Detect

Timing Control

Filter Calculate

Attenuation

Calulate

Block

Noise Shaper

Calculate

Block

PWM Data

Generation

Block

6 5

DIN

LRCI

ATTN

MODN

TSTN

CKO

XVSS

XTO

XTI

XVDO

AVDO4

AVSSI

LON

AVDO2

AVDO3

RON

AVSS2

22 23

16 17

DCKI

DFS1

DFS2

MUTEO

RSTN

DVSS

DVDD

AVDO1

L R

V+

V-

IC 203/204 (NJM4560M)

Operational Amplifier

IC 201 (SM5871AS) D/F and D/A Converter

Vcc

+ _

GND

INTERUPT SIGNAL

GENERATION BLOCK

RESET SIGNAL

GENERATION BLOCK

___

INT

_____

RESET

IC 604 (M62007FP)

(8) Vcc ---(4) Vss-----

(5) SDA

CD MECHANISM IC BLOCK DIAGRAMS

Start Cycle

Start Stop

Logic

Control

Logic

H.V. Generation

Timining

and Control

(6) SCL

Load

INC

Word

Address

XDEC

C Prom

32 X 32

Counter

YDCC

R/W

Dout

Data Register

D out

ACX

IC 602 (X204C01SI)

20 19

SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

LEVEL

9 10

IC 861 (BA6398FP) CD Driver and +5V Regulator

CD MECHANISM IC BLOCK DIAGRAMS

CONTROL

BLOCK

THERMAL

SHUT DOWN

CONTROL

BLOCK

Vcc

Vs2

Vs1

IN1

IN2

IN3

IN4

OUT3

OUT4

OUT1

OUT2

10U

Vcont

GND

PT100/P20

PT01/P21

PT1100-PT1103

T10

T11

S1/PO3

SO/PO2

_______

SCK/PO1

INTO/P10

INT1/P11

INT2/P12

INT3/P13

INT4/P00

Basic

Interval

Timer

INTBT

Timer/Event

Counter

=0 INTTO

Timer/Event

Counter

INTT1

Serial

Interface

INTS10

Interrupt

Control

Programmable

Threshold

Port = 0

Program

Counter

Rom

Program

Memory

4k-16k Bytes

Clock

Output

Control

F X/ 2

Decode Control

Clock

Divider

Bit SEQ.

Buffer:16

ALC

and

Clock

Generator

General Reg.

Data Memory

320/512 X 4 Bits

Stand By

Control

SP (8)

Bank

Ram

CPC Clock

Port 0

Port 1

Port 2

Port 3

Port 4

Port 5

Port 6

Port 7

Port 8

Port 9

Port 12

Port 13

P00-P03

P10-P13

P20-P23

P30-P33

P40-P43

P50-P53

P60-P63

P70-P73

P80-P83

P90-P93

P120-P123

P130-P133

Vss

PCL/P22

Vdd

IC 601 (uPD75118GF-K12) Microprocessor

____

Reset

Port 14

P140-P143

IC 862/863 (LB1836M)

CD MECHANISM IC PIN CONFIGURATION TABLES

IC 201 (SM5871AS) D/F and D/A Converter Table

Pin No.

10 I DIN Serial data input. Internal pull-up 11 I DFS1 De emphasis select input. Internal pull12 I DFS2 De emphasis select input. Internal pull13 O MUTEO Mute detect output

14 I RSTN Reset input. Internal pull-up resistor 15 _ DVSS Digital ground 16 _ DVDD 5V digital supply 17 _ AVDD1 Analog supply 1 18 O LO Left-channel positive PWM output 19 _ AVSS1 Analog ground 1 20 O LON Left-channel negative PWM output 21 _ AVDD2 Analog supply 2 22 _ AVDD3 Analog supply 3 23 O RON Right-channel negative PWM output 24 _ AVSS2 Analog ground 2 25 O RO Right-channel positive PWM output 26 _ AVDD4 Analog supply 4 27 _ XVDD Clock supply 28 1 XTI Crystal oscillator or external clock input

I/O Terminal

Name

1 O XTO Crystal oscillator output 2 - XVss Clock ground 3 I CKSLN Clock frequency select input. Internal

pull-up resistor 4 O CKO Clock output 5 I TSTN Test input. This pin should be tied

HIGH for normal operation. Internal pull-

up resistor 6 I MODN Mode select input. Internal pull-up

resistor 7 I ATTN Soft mute control input. Internal pull-up

resistor 8 I LRCI Data sample rate clock input. Internal

pull-up resistor 9 I BCKI Bit clock input. Internal pull-up resistor

resistor

up resistor

Description

IC 601 (uPD75116GF-K12) Microprocessor Table

Pin No.

1NC 2 I MODE Mode switch 3NC 4NC 5 O LIFTMC1 Lift motor output 6 O LIFTMC2 Lift motor output 7 I RES ET B System reset input 8 - X2 Ceramic oscillator connection terminal

9 - X1 Ceramic oscillator connection terminal

10 I LOADSWLoad switch input

I/O Terminal

Name

Description

for system clock for system clock

CD MECHANISM IC PIN CONFIGURATION TABLES

IC 601 (uPD75116GF-K12) Microprocessor Table (continued)

Pin No.

11 I TEMP Thermosensor input 12 I EJECTSWEject switch input

13 I ACCIN Acc ON/OFF input 14 O LOMP Loading motor output 15 O LOMN Loading motor output 16 O ELEVMN Elevator motor output 17 O ELEVMP Elevator motor output 18 O RESETOLSI reset signal

19 O CD_MUTEAudio output mute signal 20 NC

21 O DR8V + 8V Pow er supply ON/OFF signal 22 O COM_D

23 O CLOCK Serial clock output for CXD2517Q 24 O XLAT Data latch output for CXD2517Q 25 O LDON Laser diode control signal 26 - Vss GND 27 I STBYSTRTStand-by mode cancel signal input

28 I BATTERYBattery error input signal

I/O Terminal

Name

ATA

Description

Command output for CXD2517Q

29 I COMDINCorrespondence data input 30 I SCOR CXD2517Q Sub code frame sink input

31 NC 32 NC 33 I DISC 34 I H.POS

SW A 35 NC 36 NC 37 NC 38 NC 39 NC 40 NC 41 I SQSO CXD2517Q Sub code data input 42 NC 43 O SQCK Clock output for CXD2517Q sub code

44 I ROTDCTCElevator sensor input 45 NC

46 I FOK CXA1782BQ FOK signal input 47 I SENS CXA1782BQ SENS signal input 48 I TEST Test mode signal input 49 I MAGZ

50 I LIMIT

51 I LIFTSWBLift switch input

Home position sensor input

reading

Magazine switch input Limit switch input

CD MECHANISM IC PIN CONFIGURATION TABLES

IC 601 (uPD75116GF-K12) Microprocessor Table (continued)

Pin No.

52 I LIFTSWBLift switch input 53 I COMDOUTCorrespondence data output 54 NC

55 NC 56 NC 57 - Vp p Power supply of PROM writing 58 - Vdd Power supply (+5V) 59 I CDINOK CD mechanism in switch input 60 O CD+B Divider unit control signal 61 O SCL Clock output for S-RAM data reading

62 I/O SD A S-RAM data input/output 63 NC 64 NC

I/O Terminal

Name

and writhing

IC 861 (BA6398FP) CD Driver and +5V Regulator Table

Description

Pin No.

1 O OUT+ Focus amp output (-) 2 O OUT - Focus amp output (+) 3 I IN Focus amp input 4- NC 5 O TR-B Regulator control 6 O VREG OUT Regulator control 7 I MUTE Mute control terminal (L: Mute) 8 - Vss GND

9- NC 10 I IN Sled amp input 11 O OUT - Sled amp output (-) 12 O OUT + Sled amp output (+) 13 - Vss GND 14 O OP OUT Op amp output 15 I OP IN - Op amp input (-) 16 I OP IN + Op amp input (+) 17 O OUT + Spindle amp output (+) 18 O OUT - Spindle amp output (-) 19 I IN Spindle amp input 20 - NC 21 - Vcc +8V 22 - Vcc +8V 23 I VREF Bias amp input 24 - NC 25 I IN Tracking amp input 26 O OUT - Tracking amp output (-) 27 O OUT + Tracking amp output (+) 28 - Vss GND

I/O Terminal

Name

Description

CD MECHANISM IC PIN CONFIGURATION TABLES

IC 801 (CXD2517Q) Digital Signal Processor Table

Pin No.

1 I FOK Focus OK input. Used for SENS 2NC

3 O MDP Spindle motor servo control 4NC 5NC 6 I Test Test pin. Normally GND. 7 O FILO Master PLL (slave=digital PLL) filter

8 I FILI Master PLL filter input.

9 O PCO Master PLL charge pump output. 10 - Vs s GND. 11 - AVss Analog GND. 12 I CLTV Master VCO control voltage input. 13 - AVdd Analog power supply (+5). 14 I RF EFM signal input. 15 I BIAS Constant current input of asymmetry

16 I ASYI Asymmetry comparator voltage input. 17 O ASYO EFM full-swing output

18 I ASYE Low: asymmetry circuit off; 1 9 O WDCK D/A inter face. Word clock f=2fs

20 O LRCK D/A interface. LR clock f=fs 21 O PCMD D/A interface. Serial data (two's

22 O BCK D/A interface. Bit clock. 23 NC 24 NC 25 NC 26 - Vdd Power supply (+5V). 27 O GFS GFS output. 28 NC 29 NC 30 NC 31 NC 32 NC 33 NC 34 I XTAI 16.9344 MHz crystal oscillation circuit

35 NC 36 I XTSL Crystal selection input. Set low when

37 NC 38 NC 39 NC 40 O EMPH Outputs high signal when the

41 NC 42 - Vs s GND.

I/O Terminal

Name

Description

output and the servo auto sequencer

output.

circuit.

(low=Vss, high=Vdd) High: asymmetry circuit on.

complement, MSB first).

input, or 33.8688 MHz input.

the crystal is 16.93444 MHz, high when 33.8688 MHz.

playback disc has emphasis, low signal when no emphasis.

CD MECHANISM IC PIN CONFIGURATION TABLES

IC 801 (CXD2517Q) Digital Signal Processor Table (continued)

Pin No.

43 O SCOR Outputs high signal when either 44 NC

45 NC 46 O SQSO SubQ 80-bit serial output. 47 I SQCK SQSO readout clock input. 48 I Mute High: mute; low: release 49 O SENS SENS output to CPU. 50 I XRST System reset. Reset when low. 51 I Data Serial data input from CPU. 52 I XLAT Latch input from CPU. Serial data is

53 I CLOCK Serial input from SSP. 54 I SEIN Sense input from SSP. 55 I CNIN Track jump count signal input. 56 O DATO Serial data output to SSP. 57 O XLTO Serial data lat ch output to SP. Latched

58 - Vdd Power supply (+5V). 59 O CLKO Serial data transfer clock output to

60 I SPOA Microcomputer extended interface 61 I SPOB Microcomputer extended interface 62 I SPOC Microcomputer extended interface 63 I SPOD Microcomputer extended interface 64 NC

I/O Terminal

Name

Description

subcode sync S0 or S1 is detected.

latched at the falling edge.

at the falling edge.

SSP. (input A). (input B). (input C). (input D).

IC 821 (CXA1782BQ) Servo Signal Processor RF Amplifier Table

Pin No.

10 I TG2 External time constant setting pin for 11 I FSET High cut off frequency setting pin for

I/O Terminal

Name

1 I FEO Focus error amplifier output. Connected

internally to the FZC comparator input. 2 I FEI Focus error input. 3 I FDFCT Capacitor connection pin for defect time

constant. 4 I FGD Ground this pin through capacitor when

decreasing the focus servo high-

frequency gain. 5 I FLB External time constant setting pin for

increasing the focus servo low

frequency. 6 O FE_O Focus drive output. 7 I FE_M Focus amplifier negative input pin. 8 I SRCH External time constant setting pin for

generating focus servo wave form. 9 I TGU External time constant setting pin for

switching tacking high-frequency gain.

focus and tracking phase compensation

amplifier.

Description

CD MECHANISM IC PIN CONFIGURATION TABLES

IC 821 (CXA1782BQ) Servo Signal Processor RF Amplifier Table (continued)

Pin No.

12 I TA_M Tracking amplifier negative input pin. 13 O TA_O Tracking drive output 14 I SL_P Sled amplifier non-inversed input. 15 I SL_M Sled amplifier negative input pin. 16 O SL_O Sled drive output. 17 I ISET Setting pin for focus search, Track

18 NC 19 I CLK Serial data transfer clock input from

20 I XLT Latch input from CPU. 21 I DATA Serial data input from CPU. 22 I XRST Reset input; resets at low. 23 O C.OUT Track number count signal output.

24 O SENS Outputs FZC; DFCT.TZC. gain,

25 O FOK Focus OK comparator output.

26 O CC2 Input pin for the DEFECT bottom hold 27 I CC1 DEFECT bottom hold output.

28 I CB Connection pin for DEFECT bottom 29 I CP Connection pin for MIRR hold

30 I RF_I Input pin for the RF summing amplifier 31 O RF_O RF summing amplifier output. Eye 32 I RF_M RF summing amplifier inversed input.

33 O LD APC amplifier output. 34 I PHD APC amplifier input. 35 I PHD1 Rf I-V amplifier inversed input. Connect

36 I PHD2 RF I-V amplifier inversed input.

37 I FE_BIAS Bias adjustment of focus error amplifier. 38 I F F I-V and E I-V amplifier inversed input.

39 I E F I-V and E I-V amplifier inversed input.

I/O Terminal

Name

Description

jump, and sled kick current.

CPU. (no pull up resistance) (no pull up resistance) (no pull up resistance) (no pull up resistance)

balance and others according to the command from CPU.

(DC voltage: 10kΩ load resistance is connected)

output capacitance-coupled.

hold capacitor. capacitor. MIRR comparator non-

inversed input. output capacitance-coupled pattern check point. The RF amplifier gain is determined by

the resistance connected between this pin and RFO pin.

these pins to the photo diode A+C and B+C pins.

Connect these pins to the photo diode A+C and B+D pins.

Connect these pins to photo diodes F and E.

CD MECHANISM IC PIN CONFIGURATION TABLES

IC 821 (CXA1782BQ) Servo Signal Processor RF Amplifier Table (continued)

Pin No.

40 - EI I-V amplifier E gain adjustment. (When

41 NC 42 O TEO Tracking error amplifier output. E-F

43 I LPFI Comparator input for balance

44 I TEI Tracking error input. 45 I ATSC Window comparator input for ATSC

46 I TZC Tracking zero-crossing comparator 47 I TDFCT Capacitor connection pin for defect time 48 O VC (Vcc+Vee/2 DC voltage output.

I/O Terminal

Name

Description

not using automatic balance adjustment)

signal is output. adjustment. (input from TEO through

LPF)

detection. input. constant.

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

B 14.4 14.4 0 5 0 1.8 - 5.6 9.4 0 5

C 0 0 14.4 050514.2 14.4 14.4 0 E 0 0 14.4 0 0 0 4.9 5 8.8 14.4 0

Pin\Xistor Q851 Q852 Q853 Q861

B 0558.2

C 5 0.8 0 5 E 0558.8

IC201

Pin 12345678910111213141516171819

1.9 0 0 2.1 5 5 5 2.5 2.5 0 5 0

Pin 20 21 22 23 24 25 26 27 28

2.2 5 5 2.2 0 2.2 5 5 2.2

NC 4.7

0 4.8 5 2.2 0

Pin 12345678

IC203 3.9 3.9 3.9 0 3.5 3.5 3.9 7.9 IC204 3.9 3.9 3.9 0 3.5 3.5 3.9 7.9

IC601

Pin 12345678910111213141516171819

5 0/5

NC NC

0052.72.50004.6000055

Pin 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

5055004.154.60554.9055

NC NC

Pin 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

NC NC

0054.8500500/5*25 0 4.6

NC NC NC

Pin 58 59 60 61 62 63 64

5000055

Note *1 ID Code 1 .. 0V ID Code 2 .. 5V

*2 Pickup located utmost inside .. 0V

Pickup located otherwise .. 5V

Pin 12345678

IC602

NC NC NC

000

IC603 4.8 0.2 3.3 0 2.5 4.1 0 5 IC604 505

NC NC NC

CD MECHANISM IC AND TRANSISTOR VOLTAGE TABLES

IC801

Pin 12345678910111213141516171819

Pin 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

2.5 0 1.1

Pin 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

Pin 58 59 60 61 62 63 64

550000

Pin 12345

IC802

IC821

Pin 12345678910111213141516171819

2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 0 2.5 2.5 2.5 2.5 2.5 1.2 5 5

Pin 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

5050002.23.73.11.3303132333435363738

Pin 39 40 41 42 43 44 45 46 47 48

2.5 2.5 0 2.5 2.5 2.5 1.9 2.2 0.7 2.5

2.5

NC NC NC NC NC

2.1 0 2.5 5

005500002.502.52.55 50

NC NC

NC NC NC NC NC NC

055050550005

2.1

NC NC

IC861

Pin 12345678910111213141516171819

4.1 4.1 2.5

7.8 5 8.8 0

2.5 4.1 4.1 0 2.5 2.5 2.5 4.1 4.1 2.5

Pin 20 21 22 23 24 25 26 27 28

8.8 8.8 2.5

2.5 4.1 4.1 0

Pin 1234567891011121314

IC862 8.8 0 0 8.8 0 0 0 IC863 8.8 0 0 8.8 0 0 0

008.8000

8.8

CD MECHANISM TROUBLESHOOTING

TROUBLESHOOTING

CD MECHANISM TROUBLESHOOTING

CD-20 TROUBLESHOOTING WAVEFORMS

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

Lifestyle® Model 20 Music Center (CD-20) 183884-B5

CD will not play or the display is dim or both.

Symptom: CD changer will not operate or the display is dim.

Reason: Q10 or D8 or both have failed due to high line voltage.

Solution: Replace Q10 (2SB1142) with improved part, part number 129002 (2SB1136).

Replace D8 and add a 100 Ohm chip resistor (R28) part number 133626-1015 or any 1/8 to 1/4 Watt leaded 100 Ohm resistor to protect D8.

Refer to the schematic diagram and the PCB layout on the back of this bulletin. Use the service manual part number 183884 rev 01 for disassembly/assembly procedures.

Note: Both Q10 and D8 should be replaced regardless of the condition of the components.

DATE: 09/2000

ECN:28000

400uH

ORIGIN OF GNDD, TO GROUND CLIP

POWER JACK

(12VAC, 1.6A)

Q10

2SB1136

Q11

MMBT3904

Z11

R23

220,1/8W

Z12

D13

1N5232

5.6V

R24

220,1/8W

MMBT3904

10uH

10/25V

C14

47/25V

4.5VAC

-30V

R28

100

C19

C18

.01

100/50V

470/25V

+5V

R22

2.2K

MMBT3904

.01

7.5,5%

S1G

AC_IN

M13

.01/100V DISC

M14

.01

C32

.01

C33

D12

.01

C29

S1G

D15

.01

.01.01

C28C11

S1G

D14

C15

470/25V

Z10

C16

.01

DETECT

LM78M05

470/25V

D D

82,5%

L4810

C10

2200/25V

D D D

C27C24

100/50V100/50V

.01

C17

C22

S1G

C20

100/50V 100/50V

S1G

.047

C12

.047

ZENER

30V

CD_VCC

M19

+5V

R25

4.7K

+5V

.01

+10V

TUN+10V

C13

.01

R26

910,1/8W

R12

910,1/8W

R14

2.6K 1W

D 1

C21

CD-RES

TUN+10V

4.5VAC

-24V

-30V

SER_OUT

SER-IN

DETECT

+5V

CD_VCC

+10V

C30

2.2/50V

M20

M21

M15

M10

M17

M18

M16

-24V

TO AUDIO (TUNER)

FROM AUDIO (MICRO)

TO AUDIO (TUNER,CD)

TO AUDIO (MICRO)

FROM AUDIO (MICRO)

TO AUDIO (MICRO)

TO AUDIO (MICRO/TUNER)

TO AUDIO (CD)

TO AUDIO (MICRO)

TO AUDIO (MICRO,CD,SOLENOID)

Power Supply Schematic Diagram PCB 250737

Cut etch under C18

Remove C18

cut etch here

Resistor added to top side of PCB

add 100 Ohm resistor between C19 and C18

solder a chip resistor

across the cut etch

BOSE CD-20 SM Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual