Aiwa CX-BK1 Service Manual

CX-BK1

SERVICE MANUAL

Ver 1.0 2003.06

• CX-BK1 is the amplifier, CD pla yer, tape dec k
and tuner section in BMZ-K1.

• Tape deck is not loaded in US model.

Licensed by BBE Sound, Inc. under USP4638258, 5510752
and 5736897.

CD Section

TAPE Section
(Except US model)

US Model

AEP Model

UK Model

E Model

Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM69BV-30CBD64NS
Base Unit Name BU-30CBD64NS
Optical Pick-up Name A-MAX.3
Model Name Using Similar Mechanism NEW
Tape T ransport Mechanism T ype CMAL1Z240A

TUNER

FM tuning range 87.5 MHz to 108 MHz
FM usable sensitivity (IHF) 13.2 dBf
FM antenna terminal 75 Ω (unbalanced)
AM tuning range 530 kHz to 1710 kHz (10 kHz step)

531 kHz to 1710 kHz (9 kHz step)
AM usable sensitivity 350 µV/m
AM antenna Loop antenna

AMPLIFIER

Power output
US model: 110 W + 110 W (40 Hz - 20 kHz,

THD less than 1%, 6 Ω)

140 W + 140 W (40 Hz - 20 kHz,

THD 10%, 6 Ω)
Chilean, Peruvian and Mexican models:

140 W + 140 W (1 kHz, THD

less than 1%, 6 Ω)

180 W + 180 W (1 kHz, THD

10%, 6 Ω)
Total harmonic distortion 0.08 % (90 W, 1 kHz, 6 Ω)
Input LINE IN VIDEO: 1.0 Vp-p (75 Ω)

LINE IN AUDIO: 1.1 V

AUX (MD) IN: 1.1 V

MIC: 2.5mV (Chilean, Peruvian

and Mexican models)
Outputs SPEAKERS: 6 Ω or more

PHONES: 32 Ω or more

AUX (MD) OUT: 500 mV

VIDEO OUT: 1.0 Vp-p (75 Ω)

SPECIFICATIONS

CD PLAYER

Laser Semiconductor laser (λ = 800 nm)

Emission duration: continuous
D/A converter 1 bit dual
Signal-to-noise ratio 85 dB (1 kHz, 0 dB)
Wow and flutter Unmeasurable

CASSETTE DECK (Except US model)

Track format 4 tracks, 2 channels stereo
Frequency response 100 Hz – 10000 Hz (± 3dB)
Recording system AC bias
Heads Recording/playback × 1, erase × 1

GENERAL

Power requirements
US model: 120 V, 60 Hz
Mexican model: 127 V, 60 Hz
Chilean and Peruvian models:

120 V/220 – 230 V/240 V AC

(switchable), 50/60 Hz

COMPACT DISC RECEIVER

COMPACT DISC DECK RECEIVER

Power consumption
US model: 120 W
Chilean and Peruvian models:

Mexican model: 160 W
Power consumption in standby mode
US model: with ECO mode on: 0.25 W

Chilean and Mexican models:

Dimensions (w/h/d) Approx. 211 × 379 × 419 mm

Mass
US model: Approx. 8.6 kg (19 lbs)
Chilean and Peruvian models:

Specifications and external appearance are subject to change
without notice.

155 W

with ECO mode off: 20 W

with ECO mode on: 0.25 W
with ECO mode off: 28 W

3

(8

/8 × 15 ×16 5/8 in.)

Approx. 9.9 kg

US model

9-877-426-01 Sony Corporation

2003F05-1 Home Audio Company
C 2003.06 Published by Sony Engineering Corporation

AEP, UK, Chilean, Peruvian and Mexican models

CX-BK1

r

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.

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.

The following caution label is located inside the unit.

This appliance is classified

CLASS 1 LASER PRODUCT
LUOKAN 1 LASER LAITE
KLASS 1 LASER APPARAT

as a CLASS 1 LASER
product.

This label is located on the
rear exterior.

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow­ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica­tion is 0.75 V, so analog meters must have an accurate low­voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex­amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V A C range are suit­able. (See Fig. A)

To Exposed Metal
Parts on Set

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.

AC

1.5 k

0.15 µF

Fig. A. Using an AC voltmeter to check AC leakage.

Ω

Earth Ground

voltmete
(0.75 V)

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
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.

2

TABLE OF CONTENTS

CX-BK1

1. SERVICING NOTES ................................................ 4

2. GENERAL

Location of Controls ....................................................... 6

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 8

3-2. Panel ................................................................................ 9

3-3. Top Panel Block .............................................................. 9

3-4. Fr ont Panel Assy ............................................................. 10

3-5. MAIN Board ................................................................... 10

3-6. Rear Cover....................................................................... 11

3-7. Tuner (FM/AM) .............................................................. 11

3-8. SPEAKER Board ............................................................ 12

3-9. ACDC Board, Power Transformer.................................. 12

3-10. AMP Board ..................................................................... 13

3-11. CD Mechanism Deck (CDM69BV-30CBD64NS)......... 13

3-12. Signal Cassette Mechanism ............................................ 14

3-13. Base Unit Section............................................................ 14

3-14. Base Unit (BU-30CBD64NS)......................................... 15

3-15. BD Board......................................................................... 15

3-16. SW (1) Board, SW (2) Board, SW (3) Board,

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

3-17. CONNECTOR Board ..................................................... 16

3-18. Motor (Stocker) Assy (Stocker) (M761) ........................ 17

3-19. Motor (Roller) Assy (Roller) (M781)............................. 17

3-20. Motor (Mode) Assy (Mode) (M771) .............................. 18

3-21. Rubber Roller (Slider) Assy ........................................... 18

3-22. Timing Belt (Front/Rear) ................................................ 19

3-23. Cam (Gear)...................................................................... 19

3-24. SENSOR Board............................................................... 20

4. ASSEMBLY

4-1. How to Install the Cam (Eject Lock) .............................. 21

4-2. How to Install the Cam (Gear)........................................ 21

4-3. How to Install the Gear (Mode C) .................................. 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 Stocker Assy...................................... 23

5. TEST MODE.............................................................. 24

6. MECHANICAL ADJUSTMENTS....................... 25

7. ELECTRICAL ADJUSTMENTS

Deck Section ................................................................... 25

CD Section ...................................................................... 28

8. DIAGRAMS

8-1. Block Diagram – CD Section – ..................................... 31

8-2. Block Diagr am – TUNER/TAPE/USB Section – ......... 32

8-3. Block Diagr am – AMP Section – .................................. 33

8-4. Block Diagr am – POWER SUPPLY Section –............. 34

8-5. Note for Printed Wiring Boards

and Schematic Diagrams ................................................ 35

8-6. Printed Wiring Board – BD Board – ............................. 36

8-7. Schematic Diagram – BD Board – ................................ 37

8-8. Printed Wiring Boards – CHANGER Section –............ 38

8-9. Schematic Diagram – CHANGER Section – ................ 39

8-10. Printed Wiring Board

– DECK Board (Except US model) –............................ 40

8-11. Schematic Diagram

– DECK Board (Except US model) –............................. 41

8-12. Printed Wiring Board – MAIN Board – ........................ 43

8-13. Schematic Diagram – MAIN Board (1/4) – .................. 44

8-14. Schematic Diagram – MAIN Board (2/4) – .................. 45

8-15. Schematic Diagram – MAIN Board (3/4) – .................. 46

8-16. Schematic Diagram – MAIN Board (4/4) – .................. 47

8-17. Printed Wiring Board – USB AUX Board –.................. 48

8-18. Schematic Diagram – USB AUX Board –..................... 49

8-19. Printed Wiring Boars – MIC Board

(Chilean, Peruvian and Mexican models) – ................... 50

8-20. Schematic Diagram – MIC Board

(Chilean, Peruvian and Mexican models) – ................... 51

8-21. Schematic Diagram – AMP Board (1/2) – .................... 52

8-22. Schematic Diagram – AMP Board (2/2) – .................... 53

8-23. Printed Wiring Board – AMP Board – .......................... 54

8-24. Printed Wiring Board – HEADPHONE Board – .......... 55

8-25. Schematic Diagram – HEADPHONE Board – ............. 55

8-26. Printed Wiring Board – SPEAKER Board – ................. 56

8-27. Schematic Diagram – SPEAKER Board –.................... 57

8-28. Printed Wiring Boards – KEY Section –....................... 58

8-29. Schematic Diagram – KEY Section – ........................... 59

8-30. Printed Wiring Boards – LCD Section – ....................... 60

8-31. Schematic Diagram – LCD Section – ........................... 61

8-32. Printed Wiring Board – ACDC Board – ........................ 62

8-33. Schematic Diagram – ACDC Board – ........................... 63

8-34. Printed Wiring Board

– PT Board (US, AEP and UK models) – ...................... 64

8-35. Schematic Diagram

– PT Board (US, AEP and UK models) – ...................... 65

8-36. Printed Wiring Board – PT Board

(Chilean, Peruvian and Mexican models) – ................... 66

8-37. Schematic Diagram – PT Board

(Chilean, Peruvian and Mexican models) – ................... 67

8-38. IC Pin Function Description ........................................... 73

9. EXPLODED VIEWS

9-1. Panel Section ................................................................... 79

9-2. Top Panel Block .............................................................. 80

9-3. F ront Panel Block-1 ........................................................ 81

9-4. F ront Panel Block-2 ........................................................ 82

9-5. F ront Panel Block-3 ........................................................ 83

9-6. Chassis Block-1............................................................... 84

9-7. Chassis Block-2............................................................... 85

9-8. CD Mechanism Deck Section-1

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

9-9. CD Mechanism Deck Section-2

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

9-10. CD Mechanism Deck Section-3

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

9-11. CD Mechanism Deck Section-4

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

9-12. CD Mechanism Deck Section-5

(CDM69BV-30CBD64NS) ............................................. 90

9-13. CD Mechanism Deck Section-6

(CDM69BV-30CBD64NS) ............................................. 91

9-14. Optical Pick-up Section (BU-30CBD64NS).................. 92

10. ELECTRICAL PARTS LIST ............................... 93

3

CX-BK1

SECTION 1

SERVICING NOTES

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
pick-up block. Therefore, when checking the laser diode emis­sion, observe from more than 30 cm away from the objectiv e 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.

US model 4-245-039-0
Chilean and Peruvian models 4-245-039-1
AEP and UK models 4-245-039-2
Mexican model 4-245-039-3

[]

[]

[]

[]

SERVICE POSITION
– Tape mechanism deck (except US) –

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).

4

– 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-2501-248-A)
to the connector board (CN701) and
the main board (CN901).

CX-BK1

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

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

– main board, ACDC board –

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

AMP board

speaker board

PT board

front panel section

ACDC board

main board

tuner unit

CD mechanism deck

5

CX-BK1

• LOCATION OF CONTROLS

SECTION 2

GENERAL

This section is extracted from
instruction manual.

Main unit: front

1
2

3
4

5
6
7

8

9
0

!

1 POWER 6STANDBY/ON

Switches the unit on and off (standby).

2 FUNCTION

Switches the active function among CD, USB, TAPE
(Except US model), TUNER, VIDEO and AUX.

3 BAND

Select tuner function and the tuner band.

4 GEQ

Selects a sound equalization curve.

i-Bass

Produces rich and clear low frequency sound.

5 TREBLE/MIDDLE

Adjusts the treble or middle range level.

BASS

Adjusts the bass level.

6 PLA Y MODE (US model)

Selects various CD play mode.

wREC (Except US model)

Starts tape recording.
Also used to enter 4-second blank spaces during

@

#
$
%

^

&
*

(

)

recording.

7 TUNING DOWNf/r, UPg/t

CD: skips to a previous or a succeeding track when
pressed, searches a track in fast forward or reverse
playback when held down.
Tape: rewinds or fast forwards the tape. (Except US
model)
Tuner: manually tunes up or down within the band.

8 USB terminal

Accepts sound signals from a personal computer.
Connect your personal computer to this terminal with a
USB cable so that the unit can output the sound of an
audio file which is played back by the Winamp3 on your
computer.
Be sure to see “CONNECTING A PERSONAL
COMPUTER” for the details about the computer
requirements, how to connect and so on before actually
connecting your computer.

9 LINE IN (VIDEO/AUDIO) jacks

Accepts analog signals from external equipment.
Connect using an optional connecting cable with RCA
phono plugs (red plug to R jack, white plug to L jack,
yellow plug to VIDEO jack).
Refer also to the operating instructions of your equipment.
To switch function to external input, press FUNCTION
repeatedly to display “VIDEO”.

0 zEJECT

Ejects the disc(s).

! DISC SELECT (1-5)

Selects a disc slot.
Starts CD play for one desired disc.

@ VOLUME

Adjusts the volume.

#

TITLE

When the unit is turned off: activates or deactivated
DEMO.
Changes the display in MP3-CD or USB source.

DISPLAY

Changes the display in CD playback mode.
Turns the back light on and off when the unit is turned
off.

MODE

Selects various modes (sound adjustment, etc.) when
used in combination with ENTER and MULTI JOG.
Switches the ECO mode on and off when the unit is turned
off.

$ aPAUSE/SET

Pauses CD play.

sSTOP/CLEAR

Stops CD play.

cPRESET (US model)

Starts CD play.

dPRESET (Except US model)

Starts CD or tape play.

% MULTI JOG

When used in combination with ENTER and MULTI JOG,
CD: selects a track.
Tuner: selects a preset station.

^ ENTER

Fixes the modes and the time (clock and timer, etc.) when
used in combination with ENTER and MULTI JOG.

& PHONES jack

Plug in optional headphones set with a stereo mini plug
(Ø3.5 mm). Speaker output is canceled.

* MIC MIXING (Chilean and Peruvian

models)

Adjusts the microphone volume.

( MIC jack (Chilean and Peruvian models)

Connects the microphone.

) ALBUM/PLAY LIST k,i

Skips to a previous or succeeding album or play list.

Main unit: rear

1 AM LOOP jack and FM 75 Ω terminal

Plug in the supplied AM and FM antennas.

2 AUX IN jacks

Accept analogue sound signals from external equipment.
Connect external equipment using an optional connecting
cable with RCA phono plugs (red plug to R jack, white

1
2

3

4

5

6

plug to L jack). Refer also to the operating instructions
for your equipment.
To switch function to external input, press FUNCTION
repeatedly to display “AUX” (US model) or “MD”
(Chilean, Peruvian and Mexican models).

3 AUX OUT jacks

Analog sound signals for all functions can be output
through these jacks. Use a cable with RCA phono plugs
to connect audio equipment.
Connect the red plug to the R jack, and the white plug to
the L jack.
However, the signal is not output when the function is
“VIDEO” or “AUX” (US model) or “MD” (Chilean,
Peruvian and Mexican models).

4 VIDEO OUT

Signals from VIDEO IN jack output through this jack.

5 #SPEAKERS terminals

Connect the speaker cords of the supplied speakers.

6 AC power cord

6

CX-BK1

Remote commander

Refer to the pages indicated in parentheses for details.

1

4

6
7

9

8

0
!

@

5

3

2

Buttons with the same or similar names on the main unit
basically have the same function.

1 POWER
2 1-9, 0/10, +10

CD: selects a track of the specified number.
Tuner: tunes in the station with the specified preset
number.

The numbered buttons take on these functions when
pressed with SHIFT held down.

3 c/d

Starts CD play.

s

a
f/g
r/ tPRESET

Tuner: selects a preset station.

M/ N ALBUM

Selects a previous or a succeeding album.

4 PLAY MODE

REPEAT

Selects repeat CD playback mode.

5 CLOCK/TIMER SET

Enters clock and timer setting mode.

CLOCK/TIMER SELECT

Switches timer setting on and off.

6 DISPLAY

SOUND

Selects bass, treble or middle range level setting mode.

CLEAR

Clears a track of the CD programed playback and a tuner
preset station.

7 SHIFT

Hold down when pressing a numbered button to change
its function to that printed above the number.

8 FUNCTION
9 DISC SKIP

Changes a disc slot.

0 ENTER
! SLEEP

Selects sleep-timer mode.

@ VOLUME +, -

EDIT (Chilean, Peruvian and Mexican

BAND
SPECTRUM

Changes the spectrum analyser display.

TUNER MODE

Switches between stereo or monaural FM reception.

models)

Selects edited CD recording.

KARAOKE (Chilean, Peruvian and

GEQ

Mexican models)

Selects a Karaoke mode.

Setting the clock

1

Press CLOCK/TIMER SET on the remote.

See below when to adjust the clock.

2

Press r or t to set the hour, then press
ENTER.

3

Press r or t to set the minute.

Each press changes the time in 1-minute steps.

4

Press ENTER.

The time display stops flashing and the clock starts from
00 seconds.

•MULTI JOG is also available in place of r or t.

To adjust the clock

1 Press CLOCK/TIMER SET on the remote.
2 Press r or t repeatedly to display “CLOCK” and

then press ENTER.

3 Carry out steps 2 to 4 described in “Setting the clock” to set

the time.

To display the time while the power is on

Press DISPLAY repeatedly. The clock display appears in the
display for 6 seconds.

If “- -:- -” appears when the unit is turned off

There has been a power interruption. Reset the clock.

7

CX-BK1

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

3-1. DISASSEMBLY FLOW

SECTION 3

DISASSEMBLY

SET

3-2. PANEL

(Page 9)

3-3. TOP PANEL BLOCK

(Page 9)

3-4. FRONT PANEL

ASSY
(Page 10)

3-5. MAIN BOARD

(Page 110)

3-7. TUNER (FM/AM)

(Page 11)

3-9. ACDC BOARD, POWER TRANSFORMER

(Page 12)

3-6. REAR COVER

3-8. SPEAKER BOARD

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.
Note 3: Tape deck is not loaded in US model.

(Page 11)

(Page 12)

3-7. TUNER (FM/AM)

(Page 11)

3-8. SPEAKER

BOARD
(Page 12)

3-12. SIGNAL

CASSETTE
MECHANISM
(Page 14)

3-10. AMP BOARD

(Page 13)

3-11. CD MECHANISM DECK

(CDM69BV-30CBD64NS)
(Page 13)

3-13. BASE UNIT SECTION

(Page 14)

3-14. BASE UNIT

(BU-30CBD64NS)
(Page 15)

3-15. BD BOARD

(Page 15)

3-16. SW (1) BOARD,

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

3-19. MOTOR (ROLLER)

ASSY (ROLLER)
(M781)
(Page 17)

3-18. MOTOR (STOCKER)

ASSY (STOCKER)
(M761)
(Page 17)

3-21. RUBBER ROLLER

(SLIDER) ASSY
(Page 18)

3-22. TIMING BELT

(FRONT/REAR)
(Page 19)

3-17. CONNECTOR BOARD

(Page 16)

3-20. MOTOR (MODE)

ASSY (MODE)
(M771)
(Page 18)

3-23. CAM (GEAR)

(Page 19)

3-24. SENSOR BOARD

(Page 20)

8

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

)

3-2. PANEL

•

Tape deck is not loaded in US model.
The shape of the top panel shown in
“DISASSEMBLY” is different from the
actual shape.

3

four claws

4

2

four screws
(BVTP3

×

10)

1

three screws
(BVTP3

×

10)

9

6

three screws
(BVTP3

0

right panel

CX-BK1

×

10)

5

panel (left)

3-3. TOP PANEL BLOCK

•

Tape deck is not loaded in US model.
The shape of the top panel shown
in “DISASSEMBLY” is different from
the actual shape.

4

wire (flat type) (8core)
(CN903)

2

three claws

7

3

four screws
(BVTP3

×

top panel block

6

8

10)

four claws

1

three screws
(BVTP3

×

10)

5

wire (flat type) (11core
(CN009)

9

CX-BK1

)

3-4. FRONT PANEL ASSY

9

1

wire (flat type) (19core)
(CN905)

front panel assy

2

wire (flat type) (17core)
(CN004)

E51, MX

3

wire (flat type) (5core)
(CN504)

6

3-5. MAIN BOARD

2

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

qs

two screws
(BVTP3 × 10)

main board

5

five screws
(BVTP3 × 10)

5

1

wire (flat type) (11core)
(CN502)

6

wire (flat type) (11core)
(CN507)

8

7

six screws
(BVTP3 × 10)

7

8

two claws

connector
(CN007)

connector
(CN006)

4

connector (CN530)

3

two screws
(BVTP3

×

4

10)

screw
(BVTP3

×

10

10

qa

two screws
(BVTP3

0

×

6)

wire (flat type) (27core)
(CN901)

9

wire (flat type) (23core)
(CN902)

3-6. REAR COVER

)

r

3

connector
(CN303)

2

1

seven screws
(BVTP3

rear cove

4

CX-BK1

×

10

3-7. TUNER (FM/AM)

2

tuner (FM/AM)

1

two screws
(BVTP3

×

8)

11

CX-BK1

)

3-8. SPEAKER BOARD

3

speaker board

2

two screws
(BVTP3

×

10

1

connector
(CN503)

3-9. ACDC BOARD, POWER TRANSFORMER

1

connector (CN003)

2

connector (CN006)

5

seven screws
(BVTP3 × 10)

3

connector (CN011)

7

connector
(E51, MX: CN015)/
(US: CN011)/
(AEP, UK: CN001)

4

two screws
(BVTP3 × 10)

6

ACDC board

12

9

two screws
(ITC+4-8)

0

power transformer

8

connector
(CN008)

8

connector
(CN010)

EXCEPT E51

E51

3-10. AMP BOARD

)

4

two screws
(BVTP3

×

10)

5

AMP board

3

two screws
(BVTP3

×

CX-BK1

10)

1

3-11. CD MECHANISM DECK (CDM69BV-30CBD64NS)

5

disk mecanical holder

4

four screws
(BVTP3 × 10)

2

CD support board

two screws
(BVTP3

×

10)

1

four screws
(BVTP3 × 10

6

CD mechanism deck (CDM69BV-30CBD64NS)

3

disk mechanical cover

2

four screws
(BVTP3 × 10)

13

CX-BK1

3-12. SIGNAL CASSETTE MECHANISM

•

Tape deck is not loaded in US model.

1

connector
(CN302)

3

signal cassette mechanism

2

3-13. BASE UNIT SECTION

four screws
(BVTP3 × 10)

2

screw

(+PTPWH) (M2) (DIA. 7)

14

4

boss

7

base unit section

5

boss

6

boss

3

boss

1

floating

screw

(DIA. 12)

3-14. BASE UNIT (BU-30CBD64NS)

r

qa

base unit (BU-30CBD64NS)

1

tension spring (BU30-1)

5

floating screw
(+PTPWHM2.6

q;

vibration proof rubbers

×

6)

6

4

floating screw
(+PTPWHM2.6

9

vibration proof rubber

2

floating screw
(+PTPWHM2.6

7

vibration proof rubber

×

6)

3

floating screw
(+PTPWHM2.6

8

vibration proof rubber

×

6)

CX-BK1

×

6)

3-15. BD BOARD

2

wire (flat type) (11 core)

5

BD board

4

wire (flat type) (16 core)

3

Remove the solde

(four portions).

1

wire (flat type) (23 core)

15

CX-BK1

)

)

3-16. SW (1) BOARD, SW (2) BOARD, SW (3) BOARD, SW (4) BOARD, BRACKET (TOP) ASSY

4

SW (3) board

5

SW (4) board

6

six screws

(BVTP2.6

×

8

1

four

(BTP2.6

2

SW (1) board

7

3

SW (2) board

screws

×

6)

bracket (top) assy

3-17. CONNECTOR BOARD

– bottom view –

CONNECTOR board

5

connector
(CN703)

4

connector
(CN710)

3

2

four screws

6

CONNECTOR board

(BVTP2.6

×

8

16

1

Remove five solders.

3-18. MOTOR (STOCKER) ASSY (STOCKER) (M761)

s

d

CX-BK1

3

two screws

(BVTP2.6

5

stocker motor board

×

4

8)

2

Remove two solder

6

motor (stocker) assy (stocker) (M761)

1

belt (stocker)

3-19. MOTOR (ROLLER) ASSY (ROLLER) (M781)

3

two screws

5

motor (roller) assy

(roller)(M781)

2

Remove two solders.

4

ROLLER MOTOR

1

boar

belt (roller V)

17

CX-BK1

)

3-20. MOTOR (MODE) ASSY (MODE) (M771)

1

Remove five solders
of rotary encoder.

MODE MOTOR
board

2

Remove two solders
of motor (M771)

3

two screws
(BVTP2.6

×

8)

4

MODE MOTOR board

6

motor (mode) assy (mode) (M771)

3-21. RUBBER ROLLER (SLIDER) ASSY

8

qs

qd

rubber roller
(slider 1) assy

qa

rubber roller
(slider 2) assy

step screw

0

rubber roller
(slider 4) assy

step screw

qf

screw
(BVTP2.6

9

×

tension
spring
(slider 2)

8)

5

step screw

6

tension spring
(base slider 4)

7

rubber roller
(slider 1) assy

5

belt (mode V)

1

step screw

2

rubber roller
(slider S) assy

3

4

tension spring
(base slider 5

rubber roller
(slider 5) assy

18

qg

sub chassis

3-22. TIMING BELT (FRONT/REAR)

)

3

slider (mode cam) assy

5

two gears
(center)

6

timing belt
(front)

7

two gears (center)

8

timing belt (rear)

9

timing belt (rear)

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

timing belt
(rear)

claw

timing belt
(rear)

CX-BK1

claw

4

gear
(timing)

3-23. CAM (GEAR)

qf

cam (gear)
: Note

2

gear (mode cam)
: Note

1

screw
(PTPWH2.6

×

claw

timing belt (front)

Note: Refer to assembly (Section 4)

8)

claw

qd

screw

qs

gear(mode cam)

qa

screw

(PTPWH2.6

0

Note: Refer to assembly
(Section 4).

×

8)

gear (mode C)
:Note

9

screw

(PTPWH2.6

6

gear (mode 5)

5

screw (PTPWH2.6 × 8

4

gear (mode 5)

3

screw (PTPWH2.6 × 8)

2

pulley
(mode deceleration)

1

screw(PTPWH2.6 × 8)

8

gear (mode D)

×

8)

7

screw (PTPWH2.6 × 8)

19

CX-BK1

r

3-24. SENSOR BOARD

q;

cam (eject lock)

: Note

9

screw
(PTPWH2.6

qs

cam (BU U/D)

qd

×

8)

gear (eject lock)

7

compression spring
(shutter)

ql

8

harness

shaft
(shutter)

wa

SENSOR board

w;

screw

(BVTP2.6

6

gear (mode A)

5

base (shutter) block

qk

claw

qh

two claws

qj

rotary encode
(S771)

×

8)

qf

gear
(mode B)

qg

screw
(PTPWH2.6

×

8)

qa

screw
(PTPWH2.6

3

8)

screw
(BVTP2.6

1

screw
(PTPWH2.6

×

8)

4

two screws

×

8)

2

lever shutter (A)

(BVTP2.6

×

8)

Note: Refer to assembly (Section 4).

×

20

SECTION 4

ASSEMBLY

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

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

1

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

2

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-BK1

mark

gear (eject lock)

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

1

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

2

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 –

21

CX-BK1

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

1

Align the mark on the rotary encoder (S771) with the projection of the assy.

2

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

3

Install the gear (

rotary encoder
(S771)

mode

C)

gear (

mode

C)

cam (BU U/D)

mark projection

4-4. HOW TO INST ALL THE GEAR (MODE CAM)

1

Slide the shaft in the direction of arrow.

2

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

3

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

mark

A

gear (mode cam)

chassis

– bottom view • front –

shaft

slider (mode cam) assy

22

cam (gear)

mark

D

– bottom view • front –

mark

mark

B

C

CX-BK1

2

five

solders

6

two gears
(stocker communication)

4

gear
(stocker communication)

CONNECTOR board

7

two screws

(PTPWH2.6

×

8)

5

screw

(PTPWH2.6

×

8)

3

screw
(PWH2

×

6)

rotary encoder
(S702)

gear
(stocker
communication)

– rear –

1

rotary encoder
(S702)

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

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

4-6. HOW TO INSTALL THE STOCKER ASSY

To install three cams, align each groove
of the cam with each
chassis as shown in the figure.

cam

f

mark on the

3

screw

(PTPWH2.6

2

cam

(stocker V)

×

8)

screw

boss

rotary encoder
(S702)

hole

4

two cams

(stocker U/D)

Install the stocker assy
fitting three bosses into the
each groove of cam
then fix by rotating the cams
in the direction of arrow.

boss

5

two screws

(PTPWH2.6

×

8)

gear
(stocker communication)

– rear –

1

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

23

CX-BK1

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. Press the POWER 1 button to turn off the main power.

2. While depressing the x button, press the POWER 1 button.

3. The fluorescent indicator tube does not display any message
and the set is reset.

[Version Display Mode]

*The version of the microcomputer is displayed.

Procedure:

1. Press the POWER 1 button to turn the set on.

2. T o enter the test mode, press two buttons x and POWER 1
simultaneously for more than five seconds. T he version of the
microcomputer is displayed.

[FL T ube Check]

* All fluorecent segments are tested.

Procedure:

1. Insert a disc, and extract an AC plug.

2. While depressing the [FUNCTION] button, insert an AC plug
to enter the test mode.

3. The message “CD TEST” is displayed, the initialization is
performed.

Then all segments of the fluorecent indicator tube are turned on.

[CD 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

2. Set the FUNCTION to CD.

3. Press the x button for more than five seconds.

4. After a message “MECHA LOCK” is displayed on the fluo­rescent indicator tube, the CD ship mode is set and the power
is turned off.

POWER 1 button to turn the set on.

sage “EQ MAX”, “EQ MIN” or “EQ FLAT” is displayed in
this order.

[AM Channel Step 9 kHz/10kHz Selection Mode]

* Either the 9 kHz step or 10 kHz step can be selected for the

AM channel step.

Procedure:

1. Set the FUNCTION to AM.

2. While depressing the
ton.

3. The channel step is changed over.

[CD Test Mode]

*This mode can run the CD sled motor freely. Use this mode,

for instance, when cleaning the pickup.

Procedure:

1. Extract an AC plug.

2. While depressing the [FUNCTION] button, insert an AC plug
to enter the CD test mode. The message “CD TEST” is dis­played.

3. With the CD in stop status, press the > button to move the
pickup to outside track, or press the . button to inside track.

4. When press the B button, normal playback is performed.

5. Each time the B button is pressed during normal playback,
the tracking servo is switched on or off.

[CD Repeat 5 Times Limit Release Mode]

Procedure:

1. Press the POWER 1 button to turn the set on.

2. Select the FUNCTION to CD.

3. Press three buttons of x and [FUNCTION] and B simulta­neously.

4. The repeat all mark blinks and then repeat 5 times limit is
released.

[BAND] button, press the POWER 1 but-

[Disc T ray Lock]

The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Setting Procedure :

1. Press the POWER 1 button to turn the set on.

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

3. The message “LOCKED” is displayed and the tray is locked.

Releasing Procedure :

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

2. The message “UNLOCKED” is displayed and the tray is un­locked.

Note : When “LOCKED” is displayed, the tray lock is not released
by turning power on/off with the POWER 1 button.

[AMP Test]

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

Procedure:

1. Extract an AC plug.

2. While depressing the [GEQ] button, insert an AC plug to en­ter the AMP test mode. The message “AMP TEST” is displayed.

3. The message “Volume MAX” is displayed, when the [VOL-

UME] knob is rotated clockwise. The message “Volume 0” is

displayed, when the [VOLUME] knob is rotated counterclock­wise.

4. Each time the [BASE] or [TREBLE] knob is turned, the mes-

24

SECTION 6

)

MECHANICAL ADJUSTMENTS

CX-BK1

SECTION 7

ELECTRICAL ADJUSTMENTS

• TAPE MECHANISM DECK SECTION

Note: Tape deck is not loaded in US model.

Precaution

1. Clean the following parts with a denatured alcohol-moistened
swab:

record/playback heads pinch rollers
erase head rubber belts
capstan idlers

2. Demagnetize the record/playback head with a head
demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

Torque Measurement

Mode

FWD

FWD
back tension

REV

REV
back tension

FF/REV

FWD tension

REV tension

Torque meter

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

2.94 – 7.84 mN • m
(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

0.15 – 0.6 mN • m
2 to 6 g • cm

(0.03 – 0.08 oz • inch)

2.94 – 7.84 mN • m
(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

2.94 – 7.84 mN • m
(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

6.86 – 17.64 mN • m
(70 to 179 g • cm)

(0.98 – 2.49 oz • inch)

9.8 mN • m

(100 • cm or more)

(1.4 oz • inch or more)

9.8 mN • m

(100 • cm or more)

(1.4 oz • inch or more)

DECK SECTION

Note: Tape deck is not loaded in US model.

0 dB = 0.775 V

Precaution

1. Demagnetize the record/playback head with a head
demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the
parts adjust.

4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit ad­justment should be completed before performing recording
circuit adjustment.)

6. The adjustments should be performed for both L-CH and R­CH.

7. Switches and controls should be set as follows unless other­wise specified.

• Test Tape

Tape Signal Used for

P-4-A100 10 kHz, – 10 dB Azimuth Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Check

Record/Playback Head Azimuth Adjustment

Procedure:

1. Mode: Playback

test tape
P-4-A100
(10 kHz, – 10 dB)

SPEAKER board
SPEAKER terminal (JK502
L-CH, R-CH

set

level meter

+
–

2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.

Output
level

within
1dB

L-CH
peak

R-CH
peak

within
1dB

Screw
position

L-CH
peak

R-CH

Screw
position

peak

25

CX-BK1

)

3. Mode: Playback

SPEAKER board
test tape
P-4-A100
(10 kHz, – 10 dB)

L-CH

set

R-CH

in phase 45°90°135°180

SPEAKER terminal (JK502)

L-CH

R-CH

waveform of oscilloscope

good

oscilloscope

V

wrong

H

°

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

Adjustment Location:Record/Playback/Erase Head

Record Bias Adjustment

Procedure:

1. Record mode

MAIN board
AUX IN jack (JK602)

1) 315 Hz

AF OSC

2) 10 kHz

attenuator

600

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

recorded
portion

set

SPEAKER board SPEAKER terminal (JK502



50 mV (–23.8 dB)




Ω

set

level meter

blank tape
CN-123

+
–

adjustment screw

Tape Speed Check

Mode: Playback

test tape
WS-48B
(3 kHz, 0 dB)

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

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

Adjustment level: Playback output of 315 Hz to playback out-

put
of 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).

Adjustment Location:DECK board (Page 27)

frequency counter

set

SPEAKER board
SPEAKER terminal (JK502)
L-CH, R-CH

+
–

1. Insert the WS-48B into the deck.

2. Press the B button.

3. Confirm that the frequency counter reads 3,000 ± 90 Hz.

Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

(WS-48B)

26

– DECK Board (Component Side) (Except US model) –

CX-BK1

SFR451

Record Bias

Adjustment

(L-CH)

– MAIN Board (Conductor Side) –

SFR452

Record Bias

Adjustment

(R-CH)

JK602

AUX IN jack (R-CH)

AUX IN jack (R-CH)

– SPEAKER Board (Conductor Side) –

SPEAKER terminal

(R-CH)

JK602

SPEAKER terminal

(L-CH)

27

CX-BK1

CD SECTION

Note:

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

2. Use an oscilloscope with more than 10M Ω 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 button, insert an AC plug.

B

3. Put the disc (YEDS-18) in and press the 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 confirm peak to peak lev el within 2 ± 1
Vp-p.

S-curve waveform

+
–

symmetry

A

B

x

within 2

±

1 Vp-p

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:

oscilloscope

BD board

TP (RFAC)

TP (VC)

+
–

Procedure:

1. Connect an oscilloscope to test point TP (RFA C) 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 AC
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.

RFAC signal waveform

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

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

or B : A is more than 10 : 7.

•Take sweep time as long as possible and light up the
brightness to obtain best waveform.

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.

Checking Location: BD board (Side B)

level: 1.0

±

0.4 Vp-p

28

CX-BK1

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.

B

2. AC is put in pushing

button to enter the CD test mode.

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

B

4. Press the button. If it plays, press the 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.

Traverse Waveform

0V

Center of
the waveform

B

A (DC

voltage)

Checking Location:

– BD BOARD (Side B) –

RV101
E-F Balance
Adjustment

TP7
(VC)

IC103

TP2
(TE)

TP8
(RFAC)

IC101

TP6
(RFDC)

TP4
(FE)

level: 1.0 ± 0.5 Vp-p

6. Press the button. (The tracking servo and sledding servo

B

are turned ON)
Confirm A (DC voltage) at that tome is 0 V.

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

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

0V

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

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

Traverse Waveform

Tracking servo

Sled servo

OFF

Tracking servo

Sled servo

ON

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”.

29

CX-BK1

MEMO

30