HCD-BX77DBI - Sony Audio Service Manual (repair manual)

hcd-bx77dbi service manual
Model
HCD-BX77DBI
Pages
61
Size
4.38 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-bx77dbi.pdf
Date

Read Sony HCD-BX77DBI Service Manual online

SERVICE MANUAL
Sony Corporation
Published by Sony Techno Create Corporation
HCD-BX77DBi
SPECIFICATIONS
COMPACT DISC RECEIVER
9-889-832-04
2013B33-1
© 
2013.02
AEP Model
UK Model
Ver. 1.3  2013.02
•  HCD-BX77DBi is the amplifier, CD player, tuner 
and iPod section in CMT-BX77DBi.
Model Name Using Similar Mechanism
HCD-BX70DBi
Base Unit Name
BU-K6BD90-WOD
Optical Pick-up Name
KSM-213DCP
 
iPod is a trademark of Apple Inc., registered in the U.S. 
and other countries.
 
MPEG Layer-3 audio coding technology and patents 
licensed from Fraunhofer IIS and Thomson.
 
All other trademarks and registered trademarks are of 
their respective holders. In this manual, 
TM
 and ® marks 
are not specified.
Amplifier section
DIN power output (rated): 
18 watts + 18 watts (6 ohms at 1 kHz, DIN) 
Continuous RMS power output (reference): 25 watts + 25 watts (6 ohms at 
1 kHz, 10% THD)
Music power output (reference): 38 watts + 38 watts (6 ohms at 1 kHz, 10% 
THD)
Inputs
AUDIO IN (stereo mini jack): voltage 250 mV, impedance 47 kilohms
Outputs
PHONES (stereo mini jack): accepts headphones of 8 ohms or more
SPEAKER: accepts impedance of 6 to 16 ohms
CD player section
System: Compact disc and digital audio system
Laser Diode Properties
Emission Duration: Continuous
Laser Output*: Less than 44.6 μW
* This output is the value measurement at a distance of 200 mm from the 
objective lens surface on the Optical Pick-up Block with 7 mm aperture.
Frequency response: 20 Hz   20 kHz
Signal-to-noise ratio: More than 90 dB
Dynamic range: More than 90 dB
Tuner section
DAB tuner section:
Frequency range*
Band-III: 174.928 (5A) MHz   239.200 (13F) MHz
* For details, see “DAB frequency table” below.
Antenna: FM/DAB lead antenna
Antenna terminal: 75 ohms, F female
FM stereo, FM/AM superheterodyne tuner
FM tuner section:
Tuning range: 87.5 MHz   108.0 MHz (50 kHz step)
Antenna: FM/DAB lead antenna
Antenna terminals: 75 ohms unbalanced
Intermediate frequency: 10.7 MHz
AM tuner section:
Tuning range: 531 kHz   1,602 kHz (9 kHz step)
Antenna: AM loop antenna, external antenna terminal
Intermediate frequency: 450 kHz
DAB frequency table (Band-III)
Frequency
Label
Frequency
Label
174.928 MHz
5A
209.936 MHz
10A
176.640 MHz
5B
211.648 MHz
10B
178.352 MHz
5C
213.360 MHz
10C
180.064 MHz
5D
215.072 MHz
10D
181.936 MHz
6A
216.928 MHz
11A
183.648 MHz
6B
218.640 MHz
11B
185.360 MHz
6C
220.352 MHz
11C
187.072 MHz
6D
222.064 MHz
11D
188.928 MHz
7A
223.936 MHz
12A
190.640 MHz
7B
225.648 MHz
12B
192.352 MHz
7C
227.360 MHz
12C
194.064 MHz
7D
229.072 MHz
12D
195.936 MHz
8A
230.784 MHz
13A
197.648 MHz
8B
232.496 MHz
13B
199.360 MHz
8C
234.208 MHz
13C
201.072 MHz
8D
235.776 MHz
13D
202.928 MHz
9A
237.488 MHz
13E
204.640 MHz
9B
239.200 MHz
13F
206.352 MHz
9C
208.064 MHz
9D
– Continued on next page –
Note: Refer to supplement-1 for SPECIFICATIONS of the following serial No. or larger.
 
AEP model : Serial No. 5100859 or larger
 
UK model  : Serial No. 6123118 or larger
HCD-BX77DBi
2
1. 
SERVICING  NOTES
 ..............................................   3
2. DISASSEMBLY
2-1. Disassembly 
Flow 
...........................................................   4
2-2.  Panel (Side L/R) ..............................................................   5
2-3.  Top Panel Block ..............................................................   5
2-4.  TOP KEY Board, IP Board, Panel Top (IP) ....................   6
2-5.  Front Panel Block ...........................................................   6
2-6.  Rear Panel Block ............................................................   7
2-7. Panel 
(Rear) 
....................................................................   7
2-8.  AMP Board Block ...........................................................   8
2-9.  POWER Board Block .....................................................   8
2-10. MAIN Board ...................................................................   9
2-11.  DAB Board, Module (DAB Tuner) ................................   9
2-12.  Loading Mechanism Block .............................................   10
2-13. Base Unit .........................................................................   10
2-14. Belt ..................................................................................   11
2-15.  Optical Pick-Up Block (KSM-213DCP) ........................   11
3. 
TEST  MODE 
 ............................................................   12
4. 
ELECTRICAL  CHECKS 
 ......................................   14
5. DIAGRAMS
5-1.  Block Diagram - CD SERVO Section - ..........................   15
5-2.  Block Diagram - iPod, TUNER, DAB Section - ............   16
5-3.  Block Diagram - MAIN Section - ...................................   17
5-4. Block 
Diagram 
- PANEL, POWER SUPPLY Section - ...........................   18
5-5.  Printed Wiring Boards - CD Section - ............................   20
5-6.  Schematic Diagram - CD Board - ...................................   21
5-7.  Printed Wiring Board - DAB Board - .............................   22
5-8.  Schematic Diagram - DAB Board - ................................   23
5-9.  Printed Wiring Board - IP Board - ..................................   24
5-10.  Schematic Diagram - IP Board - .....................................   25
5-11.  Printed Wiring Boards - MAIN Section - .......................   26
5-12.  Schematic Diagram - MAIN Section (1/3) - ...................   27
5-13.  Schematic Diagram - MAIN Section (2/3) - ...................   28
5-14.  Schematic Diagram - MAIN Section (3/3) - ...................   29
5-15. Printed Wiring Boards 
- AMP, HEADPHONE Section - ....................................   30
5-16.  Schematic Diagram - AMP, HEADPHONE Section - ....   31
5-17.  Printed Wiring Boards - PANEL Section - .....................   32
5-18.  Schematic Diagram - PANEL Section - ..........................   33
5-19.  Printed Wiring Board - POWER Board - ........................   34
5-20.  Schematic Diagram - POWER Board - ..........................   35
6. 
EXPLODED  VIEWS
6-1. Panel 
Section 
...................................................................  43
6-2.  Top Panel Section ...........................................................   44
6-3.  Front Panel Section .........................................................   45
6-4.  MAIN Board Section ......................................................   46
6-5.  POWER Board Section ...................................................   47
6-6.  Loading Mechanism Section ..........................................   48
6-7.  Base Unit Section (BU-K6BD90-WOD) ........................   49
7. 
ELECTRICAL  PARTS  LIST
  ..............................   50
Accessories are given in the last of the electrical parts list.
TABLE  OF  CONTENTS
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 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.
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.
This appliance is classified 
as a CLASS 1 LASER 
product. This marking 
is located on the rear 
exterior.
iPod section
Compatible iPod models:
iPod touch
iPod nano 3rd 
generation 
(video)
iPod classic
iPod nano 2nd 
generation 
(aluminum)
iPod 5th 
generation 
(video)
iPod nano 1st 
generation
iPod 4th 
generation 
(color display)
iPod 4th 
generation
iPod mini
General
Power requirements: 230 V AC, 50/60 Hz
Power consumption: 63 watts
Dimensions (w/h/d) (excl. speakers): Approx. 215 mm × 140 mm × 298 mm
Mass (excl. speakers): Approx. 3.9 kg
Design and specifications are subject to change without notice.
CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.
HCD-BX77DBi
3
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 fl exible 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 refl ective 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.
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 viscous (sticky, less prone to fl ow) 
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.
ANTITHEFT  UNLOCK  MODE
Procedure:
1.  Press the [
?/1
] button to turn the power on.
2.  Press the [FUNCTION] button to select “CD”.
3.  Press two buttons of [
x/
CANCEL] and [
A
] for 5 seconds.
4.  The message “UNLOCKED” is displayed on the fl uorescent 
indicator tube and the disc tray is unlocked.
Note: When “LOCKED” is displayed, the tray lock is not released by 
turning power on/off with the [
?/1] button.
HOW  TO  OPEN  THE  TRAY  WHEN  POWER  SWITCH  TURN  OFF
Note: Please insert a screwdriver after removing the panel (side L).
 
About disassembly of the panel (side L), please refer to “2-2. Panel (Side L/R)” (page 5).
3
 Open the tray.
2
 Push the boss.
1
 Insert the driver.
HCD-BX77DBi
4
SECTION  2
DISASSEMBLY
•  This set can be disassembled in the order shown below.
2-1.  DISASSEMBLY  FLOW
2-2.  PANEL (SIDE L/R)
 (Page 
5)
2-3.  TOP PANEL BLOCK
 (Page 
5)
2-5.  FRONT PANEL BLOCK
 (Page 
6)
2-12. LOADING MECHANISM 
 BLOCK
 (Page 
10)
2-13. BASE UNIT
 (Page 
10)
2-14. BELT
 (Page 
11)
2-15. OPTICAL PICK-UP BLOCK
 (KSM-213DCP)
 (Page 
11)
2-6.  REAR PANEL BLOCK
 (Page 
7)
2-8.  AMP BOARD BLOCK
 (Page 
8)
2-10. MAIN BOARD
 (Page 
9)
2-9.  POWER BOARD BLOCK
 (Page 
8)
2-7. PANEL 
(REAR)
 (Page 
7)
2-11. DAB BOARD,
 
MODULE (DAB TUNER)
 (Page 
9)
2-4.  TOP KEY BOARD, 
 
IP BOARD, PANEL TOP (IP)
 (Page 
6)
SET
Page of 61
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