BMZ-K2, CX-BK2 - Sony Audio Service Manual (repair manual)

Model
BMZ-K2 CX-BK2
Pages
97
Size
8.58 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
bmz-k2-cx-bk2.pdf
Date

View Sony BMZ-K2 / CX-BK2 Service Manual online

SERVICE MANUAL
COMPACT DISC DECK RECEIVER
US Model
CX-BK2
Ver 1.1  2004.02
9-877-424-02
Sony Corporation
2004B05-1
Home Audio Company
C
 2004.02
Published by Sony Engineering Corporation
SPECIFICATIONS
CX-BK2 is the amplifier, CD player
and tuner section in BMZ-K2.
TUNER
FM tuning range
87.5 MHz to 108 MHz
FM usable sensitivity (IHF) 13.2 dBf
FM antenna terminal
75 
 (unbalanced)
AM tuning range
530 kHz to 1710 kHz (10 kHz step)
531 kHz to 1710 kHz (9 kHz step)
AM usable sensitivity
350 
µ
V/m
AM antenna
Loop antenna
AMPLIFIER
Power output
160 W + 160 W (40 Hz - 20 kHz,
THD less than 1%, 6 
)
200 W + 200 W (40 Hz - 20 kHz,
THD 10%, 6 
)
Total harmonic distortion
0.08 % (120 W, 1 kHz, 6 
)
Input
LINE IN VIDEO: 1.0 Vp-p (75 
)
LINE IN AUDIO: 1.1 V
AUX (MD) IN: 1.1 V
Outputs
SPEAKERS: 6 
 or more
PHONES: 32 
 or more
AUX (MD) OUT: 500 mV
VIDEO OUT: 1.0 Vp-p (75 
)
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
GENERAL
Power requirements
120 V AC, 60 Hz
Power consumption
145 W
Power consumption in standby mode
with ECO mode on: 0.25 W
with ECO mode off: 24 W
Dimensions (w/h/d)
Approx. 211 
×
 379 
×
 419 mm
(8 3/8 
×
 15 
×
16 5/8 in.)
Mass
Approx. 9.6 kg (21 lbs 3 oz)
Specifications and external appearance are subject to change
without notice.
Licensed by BBE Sound, Inc. under USP4638258, 5510752 and
5736897.
Model Name Using Similar Mechanism
CX-BK1
CD
CD Mechanism Type
CDM69BV-30CBD64NS
Section
Base Unit Name
BU-30CBD64NS
Optical Pick-up Name
A-MAX.3
CX-BK2
2
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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 ra-
diation exposure.
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  PUB-
LISHED  BY  SONY.
The following caution label is located inside the unit.
SAFETY  CHECK-OUT
After correcting the original service problem, perform the follow-
ing 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. Follow 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” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free 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 oc-
cur 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.
CLASS 1 LASER PRODUCT
LUOKAN 1 LASER LAITE
KLASS 1 LASER APPARA
T
This appliance is classified
as a CLASS 1 LASER
product.
This label is located on the
rear exterior.
CX-BK2
3
TABLE  OF  CONTENTS
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 .........................................................................
9
3-4. Front 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. Base Unit Section ............................................................ 14
3-13. Base Unit (BU-30CBD64NS) ......................................... 14
3-14. BD Board ......................................................................... 15
3-15. SW (1) Board, SW (2) Board, SW (3) Board,
SW (4) Board, Bracket (Top) Assy ................................. 15
3-16. CONNECTOR Board ..................................................... 16
3-17. Motor (Stocker) Assy (Stocker) (M761) ........................ 16
3-18. Motor (Roller) Assy (Roller) (M781) ............................. 17
3-19. Motor (Mode) Assy (Mode) (M771) .............................. 17
3-20. Rubber Roller (Slider) Assy ........................................... 18
3-21. Timing Belt (Front/Rear) ................................................ 18
3-22. Cam (Gear) ...................................................................... 19
3-23. SENSOR Board ............................................................... 19
4.
ASSEMBLY
4-1. How to Install the Cam (Eject Lock) .............................. 20
4-2. How to Install the Cam (Gear) ........................................ 20
4-3. How to Install the Gear (Mode C) .................................. 21
4-4. How to Install the Gear (Mode Cam) ............................. 21
4-5. How to Install the Rotary Encoder (S702),
Gear (Stocker Communication) ...................................... 22
4-6. How to Install the Stocker Assy ...................................... 22
5.
TEST  MODE
.............................................................. 23
6.
ELECTRICAL  ADJUSTMENTS
CD Section ...................................................................... 24
7.
DIAGRAMS
7-1. Block Diagram  – CD Section – ..................................... 27
7-2. Block Diagram  – TUNER//USB Section – ................... 28
7-3. Block Diagram  – AMP Section – .................................. 29
7-4. Block Diagram  – POWER SUPPLY Section – ............. 30
7-5. Note for Printed Wiring Boards
and Schematic Diagrams ................................................ 31
7-6. Printed Wiring Board  – BD Board – ............................. 32
7-7. Schematic Diagram  – BD Board – ................................ 33
7-8. Printed Wiring Boards  – CHANGER Section – ............ 34
7-9. Schematic Diagram  – CHANGER Section – ................ 35
7-10. Printed Wiring Board  – MAIN Board – ........................ 37
7-11. Schematic Diagram  – MAIN Board (1/4) – .................. 38
7-12. Schematic Diagram  – MAIN Board (2/4) – .................. 39
7-13. Schematic Diagram  – MAIN Board (3/4) – .................. 40
7-14. Schematic Diagram  – MAIN Board (4/4) – .................. 41
7-15. Printed Wiring Board  – USB AUX Board – .................. 42
7-16. Schematic Diagram  – USB AUX Board – ..................... 43
7-17. Schematic Diagram  – AMP Board (1/2) – .................... 44
7-18. Schematic Diagram  – AMP Board (2/2) – .................... 45
7-19. Printed Wiring Board  – AMP Board – .......................... 46
7-20. Printed Wiring Board  – HEADPHONE Board – .......... 47
7-21. Schematic Diagram  – HEADPHONE Board – ............. 47
7-22. Printed Wiring Board  – SPEAKER Board – ................. 48
7-23. Schematic Diagram  – SPEAKER Board – .................... 49
7-24. Printed Wiring Boards  – KEY Section – ....................... 50
7-25. Schematic Diagram  – KEY Section – ........................... 51
7-26. Printed Wiring Boards  – LCD Section – ....................... 52
7-27. Schematic Diagram  – LCD Section – ........................... 53
7-28. Printed Wiring Board  – ACDC Board – ........................ 54
7-29. Schematic Diagram  – ACDC Board – ........................... 55
7-30. Printed Wiring Board  – PT Board – .............................. 56
7-31. Schematic Diagram  – PT Board – ................................. 57
7-32. IC Pin Function Description ........................................... 63
8.
EXPLODED  VIEWS
8-1. Panel Section ................................................................... 69
8-2. Front Panel Block-1 ........................................................ 70
8-3. Front Panel Block-2 ........................................................ 71
8-4. Front Panel Block-3 ........................................................ 72
8-5. Chassis Block-1 ............................................................... 73
8-6. Chassis Block-2 ............................................................... 74
8-7. CD Mechanism Deck Section-1
(CDM69BV-30CBD64NS) ............................................. 75
8-8. CD Mechanism Deck Section-2
(CDM69BV-30CBD64NS) ............................................. 76
8-9. CD Mechanism Deck Section-3
(CDM69BV-30CBD64NS) ............................................. 77
8-10. CD Mechanism Deck Section-4
(CDM69BV-30CBD64NS) ............................................. 78
8-11. CD Mechanism Deck Section-5
(CDM69BV-30CBD64NS) ............................................. 79
8-12. CD Mechanism Deck Section-6
(CDM69BV-30CBD64NS) ............................................. 80
8-13. Optical Pick-up Section (BU-30CBD64NS) .................. 81
10. ELECTRICAL  PARTS  LIST
............................... 82
4
CX-BK2
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 electro-
static 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 emis-
sion, 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.
SERVICE  POSITION
– 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).
Connect the extension jig (J-2501-242-A) 
to the BD board (CN104) and the main board (CN507).
Connect the extension jig (J-2501-245-A) 
to the BD board (CN102)  and
the main board (CN902).
5
CX-BK2
– 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
ACDC board
CD mechanism deck
tuner unit
main board
front panel section
6
CX-BK2
SECTION  2
GENERAL
This section is extracted from
instruction manual.
• LOCATION  OF  CONTROLS
Main unit: front
3
0
!
4
9
@
#
*
6
%
$
^
&
2
1
8
7
5
1
POWER 
6
STANDBY/ON
Switches the unit on and off (standby).
2
FUNCTION 
Switches the active function among CD, USB, 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
Selects various CD play mode.
7
TUNING DOWN
f
/
r
, UP
g
/
t
CD: skips to a previous or a succeeding track when
pressed, searches a track in fast forward or reverse
playback when held down.
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” on page 18 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 z
EJECT
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.
$ a
PAUSE/SET
Pauses CD play.
s
STOP/CLEAR
Stops CD play.
c
PRESET
Starts CD 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
(
∅3.5 mm). Speaker output is canceled.
*
ALBUM/PLAY LIST 
k
,
i
Skips to a previous or succeeding album or play list.
Main unit: rear 
1
4
2
3
5
6
1
AM LOOP jack and FM 75  
 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
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
”.
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”.
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
7
CX-BK2
Remote commander
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.
BAND
SPECTRUM
Changes the spectrum analyser display.
TUNER MODE
Switches between stereo or monaural FM reception.
GEQ
3 c
/
d
Starts CD play.
s
 
a
f
/
g
 
r
t
PRESET 
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 
+
-
Note
The buttons not explained above (EDIT and KARAOKE) do
not operate for this unit.
Setting the clock
Press CLOCK/TIMER SET on the remote.
See below when to adjust the clock.
Press r or t to set the hour, then press
ENTER.
Press r or t to set the minute.
Each press changes the time in 1-minute steps.
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.
CX-BK2
8
• This set can be disassembled in the order shown below.
3-1.
DISASSEMBLY  FLOW
SECTION  3
DISASSEMBLY
3-2. PANEL
(Page 9)
3-5. MAIN BOARD
(Page 110)
3-14. BD BOARD
(Page 15)
3-21. TIMING BELT
(FRONT/REAR)
(Page 18)
3-22. CAM (GEAR)
(Page 19)
3-23. SENSOR BOARD
(Page 19)
3-10. AMP BOARD
(Page 13)
3-11. CD MECHANISM DECK
(CDM69BV-30CBD64NS)
(Page 13)
3-12. BASE UNIT SECTION
(Page 14)
3-15. SW (1) BOARD,
SW (2) BOARD,
SW (3) BOARD,
SW (4) BOARD, 
BRACKET (TOP) ASSY
(Page 15)
3-17. MOTOR (STOCKER) 
ASSY (STOCKER) 
(M761)
(Page 16)
3-16. CONNECTOR BOARD
(Page 16)
3-13. BASE UNIT
(BU-30CBD64NS)
(Page 14)
3-18. MOTOR (ROLLER) 
ASSY (ROLLER) 
(M781)
(Page 17)
3-20. RUBBER ROLLER 
(SLIDER) ASSY
(Page 18)
3-19. MOTOR (MODE) 
ASSY (MODE) 
(M771)
(Page 17)
3-7. TUNER (FM/AM)
(Page 11)
3-8. SPEAKER BOARD
(Page 12)
3-4. FRONT PANEL 
ASSY
(Page 10)
3-6. REAR COVER
(Page 11)
3-7. TUNER (FM/AM)
(Page 11)
3-8. SPEAKER 
BOARD
(Page 12)
3-3. TOP PANEL
(Page 9)
3-9. ACDC BOARD, POWER TRANSFORMER
(Page 12)
SET
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.
CX-BK2
9
Note:
 Follow the disassembly procedure in the numerical order given.
3-2.
PANEL
3-3.
TOP  PANEL
1
three screws
(BVTP3 
×
 10)
6
three screws
(BVTP3 
×
 10)
7
four screws
(BVTP3 
×
 10)
2
four screws
(BVTP3 
×
 10)
5
panel (left)
3
four claws
8
four claws
4
9
0
right panel
1
three screws
(BVTP3 
×
 10)
2
three claws
3
4
top panel
CX-BK2
10
1
wire (flat type) (19core)
(CN905)
8
front panel assy
5
two screws
(BVTP3 
×
 10)
4
five screws
(BVTP3 
×
 10)
6
four screws
(BVTP3 
×
 10)
3
connector (CN530)
7
two claws
2
wire (flat type) (17core)
(CN004)
3
two screws
(BVTP3 
×
 10)
4
screw
(BVTP3 
×
 10)
qa
two screws
(BVTP3 
×
 6)
9
wire (flat type) (23core)
(CN902)
2
wire (flat type)
(11core) (CN509)
1
wire (flat type) (11core)
(CN502)
6
wire (flat type) (11core)
(CN507)
7
connector
(CN007)
8
connector
(CN006)
qs
main board
5
0
wire (flat type) (27core)
(CN901)
3-4.
FRONT  PANEL  ASSY
3-5.
MAIN  BOARD

Download Sony BMZ-K2 / CX-BK2 Service Manual (Repair Manual)

Here you can view online and download Sony BMZ-K2 / CX-BK2 Service Manual in PDF. BMZ-K2 / CX-BK2 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony BMZ-K2 / CX-BK2 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.