Aiwa CXBK-33 Service manual

CX-BK33

SERVICE MANUAL

Ver 1.0 2004.05

• CX-BK33 is the amplifier, CD player, tape deck and tuner section in BMZ-K33.

Model Name Using Similar Mechanism NEW

CD Section

TAPE Section

CD Mechanism Type CDM69BV-30CBD64NS Base Unit Name BU-30CBD64NS Optical Pick-up Name A-MAX.3 Model Name Using Similar Mechanism CX-BK1 Tape Transport Mechanism T ype CMAL1Z241A

AEP Model

UK Model

E Model

Amplifier section European models:

DIN power output (rated): 100 + 100 W

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

120 + 120 W (6 ohms at 1 kHz, 10% THD)

Music power output (reference):

235 + 235 watts (6 ohms at 1kHz, 10% THD)

Other models:

The following measured at 120, 220 – 230, 240 V AC, 50/60 Hz DIN power output (rated): 140 + 140 W

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

180 + 180 W (6 ohms at 1 kHz, 10%

THD) Inputs MD (AUX) IN L/R (phono jacks):

Sensitivity 1 V,

impedance 47 kilohms LINE IN AUDIO L/R (phono jacks):

Vo ltage 250 mV,

impedance 47 kilohms LINE IN VIDEO (phono jack):

1Vp-p, 75 ohms MIC (phone jack) (Latin American model only):

Sensitivity 1 mV,

impedance 10 kilohms

SPECIFICATIONS

Outputs PHONES (stereo min i ja ck):

Accepts headphones with an impedance of 32 ohms or more

SPEAKER: Accepts impedance of

6 ohms

MD (AUX) OUT L/R (phono jacks):

Voltage 250 mV, impedance 1 kilohm

VIDEO OUT (phono jack):

Max. output level 1Vp-p, unbalanced, Sync negative, load impedance 75 ohms

DIGITAL OUT (European and Russian models only):

Sampling frequencies:

44.1 kHz Wavelength: 660nm

CD player section

System Compact disc and digital

audio system

Laser Semiconductor laser

(λ=795 nm) Emission duration:

continuous Frequency response 2 Hz – 20 kHz Signal-to-noise ratio More than 90 dB Dynamic range More than 90 dB

COMPACT DISC DECK RECEIVER

Tape deck section

Recording system 4-track 2-channel stereo Frequency response 100 – 10,000 Hz, using

Sony TYPE I cassettes

Tuner section

FM stereo, FM/AM superheter odyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz

(50-kHz step) Antenna FM lead antenna Antenna terminals 75 ohms unbalanced Intermediate frequency 10.7 MHz

AM tuner section

Tuning range European models:

531 – 1,602 kHz

(with the tuning interval

set at 9 kHz) Other models: 530 – 1,710 kHz

(with the tuning interval

set at 10 kHz)

531 – 1,710 kHz

(with the tuning interval

set at 9 kHz) Antenna AM loop antenna, external

antenna terminal Intermediate frequency 450 kHz

– Continued on next page –

9-877-873-01

Sony Corporation

Home Audio Company Published by Sony Engineering Corporation

CX-BK33

General

Power requirements European models:

230 V AC, 50/60 Hz

Other models: 120, 220 – 230, 240 V AC,

50/60 Hz Adjustable with voltage

selector Power consumption European models:

130 W

0.3 W (in Power Saving

mode) Other models: 155 W

0.3 W (in Power Saving

mode) Dimensions (w/h/d) incl. projecting parts and controls Amplifier/Tuner/Tape/CD section:

Approx. 207 × 391 ×

439 mm Mass European models:

Approx. 9.0 kg Other models: Approx. 10.3 kg

Design and specifications are subject to change without notice

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 °C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 °C. Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity Unleaded solder is more viscou-s (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc.

• Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

The following caution labe l is located inside the apparatus.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

CX-BK33

Playable discs

You can play back the following discs on this system. Other discs cannot be played back.

List of playable discs

Format of discs Disc logo

Audio CDs

CD-R/CD-RW (audio data/MP3 file

Discs that this system cannot play

•An 8 cm disc

•An 8 cm disc converted to a standard disc using an adaptor

•CD-ROMs

•CD-Rs/CD-RWs other than those recorded in the following formats: –music CD format –MP3 format that conforms to ISO9660

Level 1/Level 2, Joliet or Multi Session

•A disc that has a non-standard shap e ( e.g., card, heart).

•A disc with paper or sticke rs on it.

•A disc that has the adhesive, cellophane tape, or a sticker s till left on it.

ISO9660 Format The most common international standard for the logical format of files and folders on a CD- ROM . There are several specification leve ls. In Level 1, file names must be in the 8.3 format (no more than eight characters in the name, no more than three characters in the extension “.MP3”) and in capital letters. Folder names can be no longer than eight characters. There can be no more than eight nested folder levels. Level 2 specifications allow file names and folder names up to 31 characters long. Each folder can have up to 8 trees. For Joliet in the expansion format (file and folder names can have up to 32 characters), make sur e of the contents of the writing software, etc.

Multi Session This is a recording method that e na ble s adding of data using the Track-At-Once method. Conventional CDs begin at a CD control area called the Lead-in and end at an area called Lead-out. A Multi Session CD is a CD having multiple sessions, with each segment from Lead-in to Lead-out regarded as a single session.

Notes on CD-R and CD-RW

•Some CD-Rs or CD-RWs cann ot be played on this system depending upon the record ing quality or physical condition of the disc, or the characteristics of the recording device. Furthermore, the disc will not play if it has not been correctly finalized. For more information, see the operating inst ructions for the recording device .

•Discs recorded on CD-R/CD-RW drives may not be played back because of scratches, dirt, recording condition or the driver’s characteristics.

•CD-R and CD-RW discs recorded in multisession that have not ended by “closing the session” are not supp orted.

•The system may be unable to play MP3 format files that do not have the “.MP3” extension.

•Attempting to play non-MP3 format files that have the “. MP3” extension may result in noise or malfunction.

•With formats other than IS O9660 level 1 and 2, folder names or file names may not be displayed correctly.

•The following discs take a longer time to start playback.

–a disc recorded with complicated tree

structure. –a disc recorded in Multi Session. –a disc to which data can be added (non-

finalized disc).

Music discs encoded with copyright protection technologies

This product is designed to playback discs t hat conform to the Compact Disc (CD) standard. Recently, various music discs enco ded with copyright protection techno logies are market ed by some record companies. Please be aware that among those discs, there are some that do not conform to the CD standard and may not be playable by this product.

Cautions when playing a disc that is recorded in Multi Session

•If the disc begins with a CD-DA session, it is recognized as a CD-DA (audio) disc, and only the first session will be played back.

•If the disc begins with an MP3 session , it is recognized as an MP3 disc, and playback continues until a CD-DA (audio) session is encountered.

•The playback range of an MP3 disc is determined by the tree structure of files produced by analyzing of the dis c.

•A disc with a mixed CD format will be recognized as a CD-DA (audio) disc.

•Data part of CD-Extras

•Audio part of Mixed CDs

CD-Extra: This format records audio (audio CD data) on the tracks in session 1 and data on the tracks in session 2.

Mixed CD: This format records data on the first track and audio (audio CD data) on the second and subsequent tracks of a sessi

on.

CX-BK33

1. SERVICING NOTES ................................................ 5

2. GENERAL

Location of Controls........................................................ 7

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 9

3-2. Side Panel (L)/(R) ........................................................... 10

3-3. Top Panel Block .............................................................. 10

3-4. Front Panel Block ............................................................ 11

3-5. MAIN Board.................................................................... 11

3-6. Rear Panel Block ............................................................. 12

3-7. Tuner (FM/AM)............................................................... 12

3-8. SPEAKER Board ............................................................ 13

3-9. ACDC Board, Power Transformer .................................. 13

3-10. FRONT AMP Board Block ............................................. 14

3-11. CD Mechanism Deck (CDM69BV-30BD64NS) ............ 14

3-12. Base Unit Section (BU-30CBD64NS) ............................ 15

3-13. OP Assy ........................................................................... 15

3-14. SW (1) Board, SW (2) Board, SW (3) Board,

SW (4) Board, Bracket (Top) Assy.................................. 16

3-15. RELAY Board ................................................................. 16

3-16. Motor (Stocker) Assy (Stocker) (M761) ......................... 17

3-17. Motor (Roller) Assy (Roller) (M781).............................. 17

3-18. Motor (Mode) Assy (Mode) (M771)............................... 18

3-19. Rubber Roller (Slider) Assy ............................................ 18

3-20. Timing Belt (Front/Rear)................................................. 19

3-21. Cam (Gear) ...................................................................... 19

3-22. SENSOR Board............................................................... 20

3-23. Single Cassette Mechanism (CMAL1Z241A) ................ 20

4. ASSEMBLY

4-1. How To Install The Cam (Ejact Lock) ............................ 21

4-2. How To Install The Cam (Gear) ...................................... 21

4-3. How To Install The Gear (Mode 2) ................................. 22

4-4. How To Install The Gear (Mode Cam)............................ 22

4-5. How To Install The Rotary Encoder (S702),

Gear (Stocker Communication)....................................... 23

4-6. How To Install The Cam (Stocker U/D).......................... 23

4-7. How To Install The Stocker Assy .................................... 24

4-8. Phase Adjustment Between Pinions (Slider)

and Slider-1 To 5 (L/R) ................................................... 25

5. TEST MODE ............................................................... 26

6. ELECTRICAL ADJUSTMENTS

DECK Section ................................................................. 28

CD Section ...................................................................... 29

7. DIAGRAMS

7-1. Block Diagram – CD Section – ...................................... 31

7-2. Block Diagram – TUNER/TAPE/USB Section –........... 32

7-3. Block Diagram – AMP Section – ................................... 33

7-4. Block Diagram – POWER SUPPLY Section – .............. 34

7-5. Printed Wiring Board – BD Board – .............................. 36

7-6. Schematic Diagram – BD Board – ................................. 37

7-7. Printed Wirig Boards – CHANGER Section –............... 38

7-8. Schematic Diagram – CHANGER Section – ................. 39

7-9. Printed Wiring Board –DECK Board –.......................... 40

7-10. Schematic Diagram – DECK Board –............................ 41

7-11. Schematic Diagram – MAIN Board (1/4) – ................... 42

7-12. Schematic Diagram – MAIN Board (2/4) – ................... 43

7-13. Schematic Diagram – MAIN Board (3/4) – ................... 44

7-14. Schematic Diagram – MAIN Board (4/4) – ................... 45

7-15. Printed Wiring Board – MAIN Board – ......................... 46

7-16. Printed Wiring Board – FRONT AMP Board – ............. 47

7-17. Schematic Diagram – FRONT AMP Board (1/2) – ....... 48

7-18. Schematic Diagram – FRONT AMP Board (2/2) – ....... 49

7-19. Printed Wiring Board – USB Board – ............................ 50

7-20. Schematic Diagram – USB Board –............................... 51

7-21. Printed Wiring Board – MIC Board –

(Chirean and Peruvian models) ....................................... 52

7-22. Schematic Diagram – MIC Board –

(Chirean and Peruvian models) ....................................... 53

7-23. Printed Wiring Board – HEADPHONE Board – ........... 54

7-24. Schematic Diagram – HEADPHONE Board – .............. 54

7-25. Printed Wiring Board – SPEAKER Board – .................. 55

7-26. Schematica Diagram – SPEAKER Board – ................... 55

7-27. Printed Wiring Board – LCD Board –............................ 56

7-28. Schematic Diagram – LCD Board –............................... 57

7-29. Printed Wiring Boards – KEY Section –........................ 58

7-30. Schematic Diagram – KEY Section – ............................ 59

7-31. Printed Wiring Board – ACDC Board – ......................... 60

7-32. Schematic Diagram – ACDC Board –............................ 61

7-33. Printed Wiring Board – PT85 Board –

(AEP and UK models)..................................................... 62

7-34. Schematic Diagram – PT85 Board –

(AEP and UK models)..................................................... 63

7-35. Printed Wiring Board – PT96 Board –

(Chirean and Peruvian models) ....................................... 64

7-36. Schematic Diagram – PT96 Board –

(Chirean and Peruvian models) ....................................... 65

8. EXPLODED VIEWS

8-1. Panel Section ................................................................... 78

8-2. Tape Mechanism Deck Section (CMAL1Z241A)........... 79

8-3. Front Boards Section ....................................................... 80

8-4. Front Cabinet Section ...................................................... 81

8-5. MAIN Board Section....................................................... 82

8-6. Chassis Section ................................................................ 83

8-7. CD Mechanism Deck Section-1

(CDM69BV-30CBD64NS) ............................................. 84

8-8. CD Mechanism Deck Section-2

(CDM69BV-30CBD64NS) ............................................. 85

8-9. CD Mechanism Deck Section-3

(CDM69BV-30CBD64NS) ............................................. 86

8-10. CD Mechanism Deck Section-4

(CDM69BV-30CBD64NS) ............................................. 87

8-11. CD Mechanism Deck Section-5

(CDM69BV-30CBD64NS) ............................................. 88

8-12. CD Mechanism Deck Section-6

(CDM69BV-30CBD64NS) ............................................. 89

8-13. Base Unit Section (BU-30CBD64NS) ............................ 90

9. ELECTRICAL PARTS LIST................................ 91

SECTION 1

SERVICING NOTES

CX-BK33

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

Carry out the “S curve check” in “CD section adjustment” and check that the S curve waveforms is output three times.

• MODEL IDENTIFICATION – Rear Cover –

PART No.

MODEL PART No.

Chilean and Peruvian models 4-254-166-1[] AEP and UK models 4-254-166-2[]

SERVICE POSITION – Tape Mechanism Deck –

Connect the wire (flat type) (8 core) to the MAIN board (CN903) and the mechanism deck.

Connect the wire (flat type) (11 core) to the DECK board (CN008) and the MAIN board (CN009).

CX-BK33

– CD mechanism deck –

• In checking the CD mechanism deck section, prepare three extension jigs (Part No. J-2501-242-A:1.00 mm 11core/ Part No. J-2501-245-A: 1.00 mm 23 core/Part No. J-2501-248-A: 1.00mm 27 core).

Note: The CD mechanism deck of this model is a vertical type and putting it vertically as shown in the figure is the standard position.

When checking signals such as RF waveforms, operate it with the CD mechanism deck in the standard position as shown below.

Connect the extension jig (J-2501-245-A) to the BD board (CN102) and the MAIN board (CN902).

Connect the extension jig (J-2501-248-A) to the REALY board (CN701) and the MAIN board (CN901).

Connect the extension jig (J-2501-242-A) to the BD board (CN104) and the MAIN board (CN507).

– MAIN board and ACDC board –

• For connecting the CD mechanism deck, prepare three extension jigs. (Refer to “– CD mechanism deck –”)

FRONT AMP board

SPEAKER board

front panel sectio

PT85/PT96 board

ACDC board

MAIN board

tuner unit

CD mechanism deck

• LOCATION OF CONTROLS

Main unit

SECTION 2

GENERAL

CX-BK33

This section is extracted from instruction manual.

ALPHABETICAL ORDER

A – Q

ALBUM +/– ql BASS control wk CD SYNC wa DISC SELECT 1 – 5 4

Disc slot 7 DISPLAY eg Display window 3 ENTER qa EQ es FM MODE 9 FUNCTION ef i-Bass 2 JOG dial (AMS/TUNING) qs KARAOKE LINE IN AUDIO L/R jacks wf LINE IN VIDEO jack wg MIC jack MIC LEVEL MIDDLE control e; PHONES jack qg PLAY MODE 8

R – Z

REC PAUSE/START w;

Remote sensor wd REPEAT 9 Tape deck 5 TREBLE control ea TUNER/BAND ed TUNER MEMORY 0 TUNING +/– qk TUNING MODE 8

USB

wj USB port wh VOLUME control wl

wj wh

wg wf

BUTTON DESCRIPT

?/1 (power) 1 Z PUSH EJECT (eject) 5 Z (eject) 6 X (pause) qd x (stop) qf

./> (go back/go forward)

m/M (rewind/fast forward)

nN (play) ws

Latin American model only

Except for Latin American model

2 3456

234

8 0

qa qs

qh qj

IONS

wd ws wa ql

w; qk

CX-BK33

Remote control

ALPHABETICAL ORDER

A – E

ALBUM + qa ALBUM – qd CD qj CLEAR qg CLOCK/TIMER SELECT 2

CLOCK/TIMER SET 3 DISC SKIP 0 DISPLAY wa ENTER 9 EQ qf

F – Z

FM MODE 4 FUNCTION +/– 56

PLAY MODE w; REPEAT 4 SLEEP ws TUNER BAND qk TUNER MEMORY ql TUNING MODE w; VOLUME +/– qs

ws wa w; ql qk qj

qg qf

BUTTON DESCRIPTIO

?/1 (power) 1 m/M (rewind/fast forward)

X (pause) 8 x (stop) 8 N (play) 8

+/– (tuning) qh ./> (go back/go forward)

1 2 3 4 5 6

7 8

9 q;

Setting the cl

Use buttons on the remote for the operation.

Press ?/1 to turn on the system.

Press CLOCK/TIMER SET.

Press . or > repeatedly to set the hour.

Press ENTER.

Press . or > repeatedly to set the minute.

Press ENTER.

The clock starts wor king.

To adjust the clock

ock

1 Press CLOCK/TIMER SET. 2 Press . or > until “CLOCK SET”

appears, then press ENTER.

3 Do the same procedures as step 3 to 6

above.

Notes

•The clock se ttings are canceled when you disconnect the power cord or if a power failure occurs.

•You cannot set the clock in Power Saving Mode.

qa qs

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

CX-BK33

SECTION 3

DISASSEMBLY

SET

3-2. SIDE PANEL (L)/(R)

(Page 10)

3-3. TOP PANEL BLOCK

(Page 10)

3-4. FRONT PANEL

BLOCK (Page 11)

3-5. MAIN BOARD

(Page 11)

3-7. TUNER (FM/AM)

(Page 12)

3-9. ACDC BOARD, POWER TRANSFORMER

(Page 13)

3-6. REAR PANEL BLOCK

Note 1: The process described in can be performed in any order. Note 2: Without completing the process described in , the next process can not be performed.

(Page 12)

3-8. SPEAKER BOARD

(Page 13)

3-23. SINGLE CASSETTE

MECHANISM (CMAL1Z241A) (Page 20)

3-10. FRONT AMP BOARD BLOCK

(Page 14)

3-11. CD MECHANISM DECK

(CDM69BV-30CBD64NS) (Page 14)

3-12. BASE UNIT SECTION

(BU-30CBD64NS) (Page 15)

3-13. OP ASSY

(Page 15)

3-14. SW (1) BOARD,

SW (2) BOARD, SW (3) BOARD, SW (4) BOARD, BRACKET (TOP) ASSY (Page 16)

3-17. MOTOR (ROLLER)

ASSY (ROLLER) (M781) (Page 17)

3-16. MOTOR (STOCKER)

ASSY (STOCKER) (M761) (Page 17)

3-19. RUBBER ROLLER

(SLIDER) ASSY (Page 18)

3-20. TIMING BELT

(FRONT/REAR) (Page 19)

3-15. RELAY BOARD

(Page 16)

3-18. MOTOR (MODE)

ASSY (MODE) (M771) (Page 18)

3-21. CAM (GEAR)

(Page 19)

3-22. SENSOR BOARD

(Page 20)

CX-BK33

Note: Follow the disassembly procedure in the numerical order given.

3-2. SIDE PANEL (L)/(R)

side panel (L)

four screws (case 3 TP2)

screw

(BVTP3

10)

side panel (R)

screw

(BVTP3

10)

3-3. TOP PANEL BLOCK

Remove the top panel block in the direction of arrow, and release three claws.

top panel block

four screws

(case 3 TP2)

screw

(BVTP3

two wires (flat type) (11 core: CN009, 8 core: CN903)

10)

3-4. FRONT PANEL BLOCK

)

front panel block

screw

(KTP3

CX-BK33

two wires (flat type) (19 core: CN905, 17 core: CN004)

claw

connector (CN602)

harnes

3-5. MAIN BOARD

MAIN board

PC board holder (main)

three screws (BVTP3

10)

wire (flat type) (11 core: CN509) (E51)/ (15 core: CN508) (AEP, UK)

wire (flat type) (CN502)

connector (CN007)

connector (CN530)

wire (flat type) (CN507)

connector (CN006)

claw

screw

(BVTP3

10)

two screws

(BVTP3

× 6

three screws

(BVTP3

)

two wires (flat type) (27 core: CN901, 23 core: CN902)

CX-BK33

)

3-6. REAR PANEL BLOCK

connector (CN303)

five screws

(BVTP3

rear panel bloc

10)

3-7. TUNER (FM/AM)

tuner (FM/AM)

two screws

(BVTP3

× 6

3-8. SPEAKER BOARD

)

SPEAKER board

connector (CN503)

two screws

(BVTP3

12)

condenser cover

two screws

(BVTP3

CX-BK33

harness

3-9. ACDC BOARD, POWER TRANSFORMER

•

Abbreviation E51 : Chilean and Peruvian models

connector (CN006)

six screws

(BVTP3

connector (CN011)

10)

connector (CN003)

ACDC board

four screws

connector (CN011: AEP, UK/ CN015: E51)

connector (CN008) (E51)

power transformer

connector (CN007: E51/ CN010: AEP, UK)

CX-BK33

)

3-10. FRONT AMP BOARD BLOCK

two screws

(BVTP3

10)

FRONT AMP board block

two screws

(BVTP3

3-11. CD MECHANISM DECK

(CDM69BV-30CBD64NS)

mechanical holder (disk)

screw (BVTP3

10)

two claws

two hooks

four screws

(BVTP3

10)

mechanical cover (disk)

two screws

(BVTP3

10)

bracket

two claws

CD mechanism deck (CDM69BV-30CBD64NS)

three screws

(BVTP3

10)

)

3-12. BASE UNIT SECTION

(BU-30CBD64NS)

floating

CX-BK33

screw

3-13. OP ASSY

vibration proof rubber

floating screw (PTPWHM2.6)

boss

base unit

(BU-30CBD64NS)

floating screw (PTPWHM2.6)

section

OP assy

boss

screw

(PTPWHM2.6

two floating screws (PTPWHM2.6)

vibration proof rubber

tension spring (BU30-1)

holder (BU-30)

two vibration proof rubbers

CX-BK33

)

3-14. SW (1) BOARD, SW (2) BOARD, SW (3) BOARD, SW (4) BOARD, BRACKET (TOP) ASSY

SW (3) board

SW (4) board

six screws

(BVTP2.6

four

(BTP2.6

SW (1) board

SW (2) board

screws

bracket (top) assy

3-15. RELAY BOARD

RELAY board

– bottom view –

connector (CN703)

connector (CN710)

four screws

RELAY board

(BVTP2.6

Remove five solders.

3-16. MOTOR (STOCKER) ASSY (STOCKER) (M761)

CX-BK33

STOCKER MOTOR

two screws (BVTP2.6

board

Remove two solders.

motor (stocker) assy (stocker) (M761)

belt (stocker)

3-17. MOTOR (R OLLER) ASSY (ROLLER) (M781)

two screws

motor (roller) assy

(roller)(M781)

Remove two solders.

ROLLER MOTOR

belt (roller V)

boar

CX-BK33

)

3-18. MOTOR (MODE) ASSY (MODE) (M771)

Remove five solders of rotary encoder.

MODE MOTOR board

Remove two solders of motor (M771)

two screws

(BVTP2.6

MODE MOTOR

motor (mode) assy (mode) (M771)

board

3-19. RUBBER ROLLER (SLIDER) ASSY

step screw

tension spring (slider 2)

rubber roller (slider 1) assy

rubber roller (slider 2) assy

step screw

rubber roller (slider 4) assy

screw

(BVTP2.6

step screw

tension spring (base slider 4)

belt (mode V)

step screw

rubber roller (slider S) assy

tension spring (base slider 5

rubber roller (slider 5) assy

sub chassis

3-20. TIMING BELT (FRONT/REAR)

)

slider (mode cam) assy

two gears (center)

timing belt (front)

two gears (center)

timing belt (rear)

When install three timing belts, its pass under each claws.

timing belt (rear)

claw

timing belt (rear)

CX-BK33

claw

gear (timing)

3-21. CAM (GEAR)

cam (gear) : Note

gear (mode cam) : Note

screw (PTPWH2.6

claw

timing belt (front)

Note: Refer to assembly (Section 4)

claw

screw

gear(mode cam)

screw

(PTPWH2.6

Note: Refer to assembly (Section 4).

gear (mode C) :Note

screw

(PTPWH2.6

gear (mode 5)

screw (PTPWH2.6 × 8

gear (mode 5)

screw (PTPWH2.6 × 8)

pulley (mode deceleration)

screw(PTPWH2.6 × 8)

gear (mode D)

screw (PTPWH2.6 × 8)

CX-BK33

3-22. SENSOR BOARD

cam (eject lock)

: Note

cam (BU U/D)

screw (PTPWH2.6

gear (eject lock)

screw (PTPWH2.6

harness

shaft (shutter)

compression spring (shutter)

screw (BVTP2.6

SENSOR board

screw

(BVTP2.6

gear (mode A)

base (shutter) block

lever shutter (A)

screw (PTPWH2.6

two screws (BVTP2.6

claw

two claws

rotary encode (S771)

screw

gear (mode B)

Note: Refer to assembly (Section 4).

(PTPWH2.6

3-23. SINGLE CASSETTE MECHANISM

(CMAL1Z241A)

top panel section

four screws

(BVTP3

10)

single

(CMAL1Z241A)

connector

cassette mechanism

SECTION 4

ASSEMBLY

• This set can be assembled in the order shown below.

4-1. HOW TO INSTALL THE CAM (EJECT LOCK)

Rotate the cam (BU U/D) fully in the direction of arrow.

Engage the gear (eject lock) and the gear of the cam (eject lock) aligning the mark with the center of the gear (eject lock).

cam (BU U/D)

CX-BK33

mark

gear (eject lock)

4-2. HOW TO INSTALL THE CAM (GEAR)

Check that the cam (BU U/D) can not be rotated in the direction of arrow.

Align the mark on the cam (gear) with the boss as shown in the figure and install the cam (gear).

cam (gear)

cam (BU U/D)

cam (eject lock)

– bottom view • front –

boss

mark

– bottom view • front –

CX-BK33

4-3. HOW TO INSTALL THE GEAR (MODE 2)

Align the mark on the rotary encoder (S701) with the projection of the assy.

Check that the cam (BU U/D) can not be rotated in the direction of arrow.

Install the gear (mode 2).

rotary encoder (S771)

gear (mode C)

cam (BU U/D)

mark projection chassis

– bottom view • front –

4-4. HOW TO INSTALL THE GEAR (MODE CAM)

Slide the shaft in the direction of arrow.

Align mark A on the gear (mode cam) with mark B on the slider (mode cam) assy, then install the gear (mode cam).

Check that mark C on the gear (mode cam) is in alignment with mark D on the cam (gear).

mark

gear (mode cam)

shaft

slider (mode cam) assy

cam (gear)

mark

– bottom view • front –

mark

CX-BK33

4-5. HOW TO INSTALL THE ROTARY ENCODER (S702), GEAR (STOCKER COMMUNICATION)

Engage the rotary encoder (S702) and the gear (stocker communication) as shown below in the figure.

rotary encoder (S702)

gear (stocker communication)

screw (PWH2

rotary encoder (S702)

screw

(PTPWH2.6

two screws (PTPWH2.6

two gears (stocker communication)

gear (stocker communication)

– rear –

4-6. HOW TO INSTALL THE CAM (STOCKER U/D)

screw

(PTPWH2.6

cam (stocker U/D)

rotary encoder (S702)

screw

five

solders

RELAY board

Position the hole on the gear (stocker communication) on the screw of the rotary encoder (S702).

gear (stocker communication)

– rear –

hole

two screws

(PTPWH2.6

cam (stocker U/D)

mark

cam (stocker U/D)

To install three cams (stocker U/D), align each groove of the cam (stocker U/D) with each f mark on the chassis as shown in the figure.

cam (stocker U/D)

mark

two cams

(stocker U/D)

CX-BK33

4-7. HOW TO INSTALL THE STOCKER ASSY

Fit three shafts of the stocker assy in respective slits of the cams (stocker U/D).

cam (stocker U/D)

Note: For the location of slits of the cams (stocker U/D),

see 4-6. HOW TO INSTALL CAM (STOCKER U/D).

cam (stocker U/D)

shaft shaftstocker assy

cam (stocker U/D)

shaft

pulley (stocker)

stocker assy

pulley (stocker)

Making sure that three shafts of the stocker assy fit in respective slits of the cams (stocker U/D), rotate the pulley (stocker) in the direction of arrow A by hand to store the stocker assy.

4-8. PHASE ADJUSTMENT BETWEEN PINIONS (SLIDER) AND SLIDER-1 TO 5 (L/R)

As shown in the following figure, adjust the portion A of each slider to the boss with the

slider-1 to 5 (L) and the slider-1 to 5 (R) pushed in the arrow directions respectively (see Fig. 1).

Paying attention to the up/down direction of the pinion (slider) (see Fig. 2), install each pinion (slider) so that the portion

Note: Push in the pinion (slider) until the claw of the boss comes out above the pinion (slider) to lock.

of each pinion (slider) meshes with the portion A of each slider (see Fig. 3).

CX-BK33

slider-5 (L)

slider-4 (L)

slider-3 (L)

slider-2 (L)

slider-1 (L)

(Fig. 1)

boss

claw

slider-5 (R)

slider-4 (R)

slider-3 (R)

slider-2 (R)

slider-1 (R)

boss

pinion (slider)

pinion (slider) portion

slider portion

(Fig. 2)

boss

(Fig. 3)

pinion (slider) portion

slider portion

claw

boss

pinion (slider)

CX-BK33

SECTION 5

TEST MODE

COLD RESET

The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customer.

Procedure:

1. While pressing the x , press the [DISC SELECT 1] button and

turn the [VOLUME] knob in the clock wise.

2. The liquid crystal display becomes blank for a while, and the

set is reset, then becomes demonstration mode.

SHIP MODE

This mode moves the optical pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

1. Press the I/1 button to turn the power on.

2. Press the [FUNCTION] button to select “CD”.

3. Eject the all disk.

4. While pressing the x , press the [FUNCTION] button and turn

the [VOLUME] knob in the clock wise.

5. The message “MECHA LOCK” is displayed on the liquid

crystal display and the ship mode is set, then becomes power off.

6. After the step 4, pull out the AC cord.

7. Then turn the power on, mecha initialization is performed

again.

COLD RESET AND SHIP MODE

This mode performs “COLD RESET” and “SHIP MODE” at the same time.

Procedure:

1. Eject the all disc.

2. While pressing the

turn the [VOLUME] knob in the clock wise.

3. The message “MECHA LOCK” is displayed on the liquid

crystal display and the ship mode is set, then becomes power off.

4. Then the liquid crystal display becomes blank for a while, and

the set is reset.

5. After the step 4, pull out the AC cord.

6. Then turn the power on, mecha initialization is performed

again.

x , pr ess the [DISC SELECT 3] button and

AMP TEST

This mode is used to check the function of the amplifier.

Procedure:

1. Press the I/1 button to turn the power on.

2. While pressing the x , press the [i-BASS] button and turn the

[VOLUME] knob in the clock wise.

3. The message “AMP TEST” is displayed on the liquid crystal

display.

4. When the [VOLUME] knob is turned counter-clockwise, the

message “VOLUME MIN” is displayed on the liquid crystal display. When the [VOLUME] knob is turned clockwise. The message “VOLUME 16” is displayed on the liquid crystal display. When the [VOLUME] knob is turned clockwise again. The message “VOLUME MAX” is displayed on the liquid crystal display.

5. Each time the [TREBLE] knob is turned, the message “TREBLE

MIN”, “TREBLE FLAT” or “TREBLE MAX” is displayed in this order on the liquid crystal display.

6. Each time the [MIDDLE] knob is turned, the message “MIDDLE

MIN”, “MIDDLE FLAT” or “MIDDLE MAX” is displayed in this order on the liquid crystal display.

7. Each time the [BASS] knob is turned, the message “BASS

MIN”, “BASS FLAT” or “BASS MAX” is displayed in this order on the liquid crystal display.

8. Each time the [EQ] knob is pressed, the message “EQ MIN”, “EQ FLAT” or “EQ MAX” is displayed in this order on the liquid crystal display.

9. To release from this mode, press the I/1 button to turn the power off.

TAPE TEST

This mode is used to check the recoding operation.

Procedure:

1. Press the I/1 button to turn the power on.

2. While pressing the x , press the [DISC SELECT 2] button and turn the [VOLUME] knob in the clock wise.

3. The message “TAPE TEST” is displayed on the liquid crystal display.

4. Input audio signal from the MD (AUX) jack (JK602).

5. Press the [REC PAUSE/START] button to start recording.

6. When the x button is pressed during recording, the tape is rewound back to the beginning of recording, then playback starts.

7. To release from this mode, press the I/1 button to turn the power off.

PANEL TEST

This mode is used to check the liquid crystal display, micro computer software version, model destination, panel key and jog dial.

Procedure:

1. Press the I/1 button to turn the power on.

2. While pressing the x , press the [DISC SELECT 5] button and turn the [VOLUME] knob in the clock wise.

3. All segments of liquid crystal display are turned ON.

4. Press two buttons of [ENTER] and [EJECT] simultaneously. The software version of micro computer is displayed. example of display: GO. 1.01A040302 (Case of the software version of micro computer is 1.01)

5. Press two buttons of [ENTER] and [EJECT] simultaneously. The model name and destination is displayed. example of display: BM70 LATIN (Case fo Chilean and Peruvian models)

6. Press two buttons of [ENTER] and [EJECT] simultaneously. The message “KEY 0 0” is displayed on the liquid crystal display. Each time b utton is pressed, the number shown in the following figure is displayed.

Left Right Number Button Number Button

1 Z 1 [KARAOKE] 2 [DISC SELECT 5] 2 N 3 [DISC SELECT 4] 3 X 4 [DISC SELECT 3] 4 x 5 [DISC SELECT 2] 5 > M 6 [DISC SELECT 1] 6 . m 7 [i-BASS] 7 ALBUM – 8 I/1 8 ALBUM + 9 [DISPLAY] 9 REC PAUSE/

10 [FUNCTION] 10 [CD SYNC] 11 [TUNER/BAND] 11 [ENTER] 12 [EQ] 12 [TUNER MEMORY]

14 PLAY MODE/

START

REPEAT/

FM MODE

TUNING MODE

CX-BK33

6. Press two buttons of [ENTER] and [EJECT] simultaneously. The message “KEYCNT 2” is displayed on the liquid crystal display. When display is different, check the connection of 96 and 97 pins of the micro computer (IC901) and mounting of pull-up resistor.

7. Press two buttons of [ENTER] and [EJECT] simultaneously. When the [VOLUME] knob is turned clockwise, the message “VOLUME UP” is displayed on the liquid crystal display. When the [VOLUME] knob is turned counter-clockwise. The message “VOLUME DOWN” is displa yed on the liquid crystal display.

8. When the [TREBLE] knob is turned clockwise, the message “TREBLE UP” is displayed on the liquid crystal display. When the [TREBLE] knob is turned counter-clockwise. The message “TREBLE DOWN” is displayed on the liquid crystal display.

9. When the [MIDDLE] knob is turned clockwise, the message “MIDDLE UP” is displayed on the liquid crystal display. When the [MIDDLE] knob is turned counter-clockwise. The message “MIDDLE DOWN” is displayed on the liquid crystal display.

10. When the [BASS] knob is turned clockwise, the message “BASS UP” is displayed on the liquid crystal display. When the [BASS] knob is turned counter-clockwise. The message “BUSS DOWN” is displayed on the liquid crystal display.

11. When the [AMS/TUNING] knob is turned clockwise, the message “JOG UP” is displayed on the liquid crystal display. When the [AMS/TUNING] knob is turned counter-clockwise. The message “JOG DOWN” is displayed on the liquid crystal display.

Note: When the software version of micro computer is 1.01 or less, the

[AMS/TUNING] knob is tuned, the message “VOLUME FLAT” is displayed.

12. To release from this mode, press two b uttons of [ENTER] and [EJECT] simultaneously.

REPEAT 5 TIMES LIMIT OFF

The number of repeat for CD playback is 5 times when the repeat mode is “REPEAT”. This mode enables CD to repeat playback for limitless times.

Procedure:

1. Press the I/1 button to turn the power on.

2. Press the [FUNCTION] button to select “CD”.

3. While pressing the x , press the [EQ] button and turn the [VOLUME] knob in the clock wise.

4. The “REP” segments blinks on the liquid crystal display and repeat 5 times limit is released.

5. To release from this mode, perform step 4.

ROBBERY PREVENTION LOCK

This mode is used to unable to take sample disc out of set in the shop.

Note: This mode can’t be used when the disc is not inserted.

Procedure:

1. Press the I/1 button to turn the power on.

2. Press the [FUNCTION] button to select “CD”.

3. Insert the disc.

4. Press two buttons of x and Z simultaneously for five seconds.

5. The message “LOCKED” is displayed on the liquid crystal display and the disc tray is locked. (Even if pressing the Z button, the message “LOCKED” is displayed on the liquid crystal display and the disc tray is locked)

6. To release from this mode, press two buttons of [ENTER] and Z simultaneously for five seconds again.

7. The message “UNLOCKED” is displayed on the liquid crystal display and the disc tray is unlocked.

CD TEST

This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the optical pick-up.

Procedure:

1. Press the I/1 button to turn the power on.

2. Press the [FUNCTION] button to select “CD”.

3. While pressing the x , press the [DISC SELECT 4] button and turn the [VOLUME] knob in the clock wise.

4. The message “CD TEST” is displayed on the liquid crystal display.

5. Press the > M button to move the optical pick-up to outside track, or press the . m button to inside track.

MECHA TEST

This mode can perform the CD mecha aging.

Procedure:

1. Press the I/1 button to turn the power on.

2. Press the [FUNCTION] button to select “CD”.

3. While pressing the x , press the [DISC SELECT 4] button and turn the [VOLUME] knob in the clock wise, then press the [PLAY MODE/TUNING MODE] button.

4. The message “MEC TEST” is displayed on the liquid crystal display. Then one of the step 5 to 8can be performed.

5. Press the [REPEAT/FM MODE] button, perform the aging mode (with reading).

6. Press the [i-BASS] button, perform the aging mode (no reading).

7. Press the [DISC SELECT 1] to [DISC SELECT 5] or Z button, perform the mecha manual operation.

8. Press the [DISPLAY] button, error history is displayed on the liquid crystal display.

9. To release from this mode, press the I/1 button.

CX-BK33

)

SECTION 6

ELECTRICAL ADJUSTMENTS

DECK SECTION

0 dB = 0.775 V

• Precaution

1. The adjustment should be performed with the rated power supply voltage.

2. The adjustments should be performed for both L-ch and R-ch.

RECORD BIAS ADJUSTMENT

Procedure:

1. Record mode

MAIN board MD (AUX) IN jack (JK602)

1) 315 Hz

AF OSC

2) 10 kHz

attenuator

2. Mode: Playback i-Bass OFF BASS 0 TREBLE 0

recorded portion



50 mV (–23.8 dB)

 

600

Ω

set

blank tap CN-123

level mete

– MAIN Board (Conductor Side) –

JK602

MD (AUX) IN jack (R-CH)

MD (AUX) IN jack (L-CH)

set

SPEAKER board SPEAKER terminal (JK502)

+ –

3. Confirm playback the signal recorded in step 1 become adjustment level as follows.

4. If these levels do not adjustment level, adjustment the SFR452 (L-ch) and SFR451 (R-ch) to repeat steps 1 and 4.

Adjustment level: Playback output of 315 Hz to playback output

of 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).

Adjustment Location: DECK board

— DECK BOARD (Component Side) —

SFR451

REC Bias

Adjustment

(R-ch)

SFR452

REC Bias

Adjustment

(L-ch)

– SPEAKER Board (Conductor Side) –

JK502

SPEAKER terminal (L-CH)

CN503

SPEAKER terminal (R-CH

CX-BK33

–

BD board

TP (RFAC)

TP (VC)

oscilloscope

CD SECTION

Note:

1. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

2. Use an oscilloscope with more than 10MW impedance.

3. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

S-CURVE CHECK

Connection:

oscilloscope

BD board

TP (FE) TP (VC)

Procedure:

1. Connect an oscilloscope to test point TP (FE) and TP (VC) on the BD board.

2. While depressing the N button, insert an AC plug.

3. Put the disc (YEDS-18) in and press the x button and actuate the focus search. (actuate the focus search when disc table is moving in and out)

4. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And conf irm peak to peak level within 2 ± 1 Vp-p.

S-curve waveform

–

symmetry

RFDC signal waveform

VOLT/DIV: 200 mV TIME/DIV: 500 ns

level: 0.6

0.15 Vp-p

Checking Location: CD board (Conductor side)

RFAC LEVEL CHECK

Connection:

Procedure:

1. Connect an oscilloscope to test point TP (RF AC) and TP (VC) on the BD board.

2. Turn the power on.

3. Put the disc (YEDS-18) in to playback the number five track.

4. Confirm that oscilloscope waveform is clear and check RF A C signal level is correct or not.

Note: A clear RFAC signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

Note: • Try to measure several times to make sure than the ratio of A : B

or B : A is more than 10 : 7.

• Take sw eep time as long as possible and light up the brightness to

obtain best waveform.

within 2

1 Vp-p

Checking Location: BD board (Side B)

RFDC LEVEL CHECK

Connection:

oscilloscope

BD board

TP (RFDC)

TP (VC)

–

Procedure:

1. Connect an oscilloscope to test point TP (RFDC) and TP (VC) on the BD board.

2. Turn the power on.

3. Put the disc (YEDS-18) in to playback the number five track.

4. Confirm that oscilloscope waveform is clear and check RFDC signal level is correct or not.

Note: A clear RFDC signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

RFAC signal waveform

Checking Location: BD board (Side B)

VOLT/DIV: 200 mV TIME/DIV: 500 ns

level: 1.0

0.4 Vp-p

CX-BK33

E-F BALANCE ADJUSTMENT

Connection:

oscilloscope

BD board TP (TE)

TP (VC)

–

Procedure:

1. Connect an oscilloscpe to test point TP (TE) and TP (VC) on the BD board.

2. AC is put in pushing N button to enter the CD test mode.

3. Put the disc (YEDS-18) in to playback the number five track.

4. Press the N button. If it plays, press the N button again. B (The tracking servo and the sledding servo are turned OFF)

5. Rotate RV101 on the BD board to adjust A (DC voltage) of the center of the oscilloscope waveform becomes 0 V.

Trav erse W a veform

Center of the waveform

A (DC

voltage)

level: 1.0 ± 0.5 Vp-p

Checking Location:

– BD BOARD (Side B) –

RV101 E-F Balance Adjustment

TP7 (VC)

IC103

TP2 (TE)

TP8 (RFAC)

IC101

TP6 (RFDC)

TP4 (FE)

6. Press the N button. (The tracking servo and sledding servo are turned ON) Confirm A (DC voltage) at that tome is 0 V.

7. To exit from this mode, turn the power off.

Note: • Always move the optical pick-up to most inside track when exiting

from this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can be

chipped.

Trav erse W a veform

Tracking servo

Sled servo

OFF

Tracking servo

Sled servo

A (DC voltage)

Checking Location: BD board (Side B)

ADJUSTMENT AFTER CD BASE UNIT (BU-30CBD64NS) IS REPLACED

Perform the “E-F Balance (1 track jump) check”.

+ 80 hidden pages

Aiwa CXBK-33 Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

DISASSEMBLY

top panel block

front panel block

MAIN board

tuner (FM/AM)

SPEAKER board

FRONT AMP board block

CD mechanism deck (CDM69BV-30CBD64NS)

OP assy

RELAY board

motor (stocker) assy (stocker) (M761)

motor (mode) assy (mode) (M771)

SENSOR board

ASSEMBLY

TEST MODE

ELECTRICAL ADJUSTMENTS

DECK SECTION

CD SECTION