HCD-MJ1, HCD-MJ1A - Sony Audio Service Manual (repair manual)

hcd-mj1, hcd-mj1a service manual
Model
HCD-MJ1 HCD-MJ1A
Pages
67
Size
9.28 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-mj1-hcd-mj1a.pdf
Date

Read Sony HCD-MJ1 / HCD-MJ1A Service Manual online

 
CD
 Model Name Using Similar Machanism
HCD-D1/T1
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
 
Section
 CD Mechanism Type
CDM13C-5BD19
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
 Base Unit Name
BU-5BD19
 MD
 Model Name Using Similaar Mechanism
NEW
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
 Section
 Mini Disc Mechanism Type
MDM-2ER
SERVICE MANUAL
FLAT COMPONENT SYSTEM
HCD-MJ1
US Model
Canadian Model
AEP Model
UK Model
E Model
SPECIFICATIONS
r
 HCD-MJ1 is the tuner, CD
amplifier and MDsection in
MJ-L1.
CD ptayer section
System
Compact disc and digital audio system
Laser
Semiconductor laser (
λ=780 nm)
Emission duration: continuous
Laser output
Max 44.6 
µW*
* This output is the value measured at a
distance of 200mm from the objective
lens surface on the Optical Pick-up
Block with 7 mm aperture.
Wavelength
780 - 790 nm
Frequency response
2 Hz - 20 kHz
MiniDisc deck section
System
MiniDisc digital audio system
Disc
MiniDisc
Laser
Semiconductor laser (
λ= 780 nm)
Laser output
Max 44.6 
µW*
* This output is the value measured at a
distance of 200mm from the objective
lens surface on the Optical Pick-up
Block with 7 mm aperture.
Laser diode properties
Materi.II: GaAIAs
Revolutions (CLV)
Approx. 400 rpm to 900 rpm
Error correction
Adv,Inced Cross IntL•rleave Rced
Solomon Code (ACIRC)
Sampling frequency
44.1 kHZ
Modulation system
EFM
(Eight-to-Fourteen Modula tion)
Number of channels
2 stereo channels
Frequency response
5 Hz - 20 kHz
Wow and fluttei
Below measurable limit
Tuner section
FM tuner section
Tuning range
US, Canadian model
: 87.5 - 108.0 MHz (100 kHz step)
Except US, Canadian model
: 87.5 - 108.0 MHz (50 kHz step)
Aerial FM Iead aerial
Aerial terminal
75 ohm unbalanced
Intermediate frequency
l0.7 MHz
AM tuner section
Tuning range
US, Canadian model
: 530 - 1.710 kHz
  (with the interval set at 10 kHz)
AEP, UK, German, Italian, Singapore,
Hong kong model
: 531 - 1.602 kHz
  (with the interval set at 9 kHz)
Aerial
AM Ioop aerial,
External aerial terminals
Intermediate frequency
450 kHz
Timer section
System
Quartz lock system
Timer setting
One-minute step
Sleep timer
10-minute step. max. 90 minutes
– Continued on pag 2 –
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Ver 1.2  2003.12
9-960-606-13
2003L02-1
© 2003.12
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
– 2 –
TABLE OF CONTENTS
Specifications ...............................................................................  1
1.
SERVICING NOTES
..................................................
4
2.
GENERAL
Index to parts and Controls .................................................... 5
3.
DISASSEMBLY
3-1. Case (Top) Section and
       Plate (T back) Ornamentel Removal ............................... 8
       3-2. Main board,Tuner board and Display board Removal .... 8
       3-3. CD Mechanism, MD Mechanism and
       Digital board Removal .................................................... 9
4.
DISC TABLE GETTING OUT PROCEDURE
ON THE POWER SUPPLY IS OFF
.......................
10
5.
TEST MODE
.............................................................
11
6.
ELECTRICAL ADJUSTMENTS
..................................... 14
7.
EXPLANATION OF IC TERMINALS
...................... 22
8.
DIAGRAMS
8-1.   Block Diagram –Main Section– ................................. 30
8-2.   Block Diagram –MD Section– ................................... 33
8-3.   Circuit Boards Location .............................................. 37
8-4.   Printed Wiring Boards –Main Section– ...................... 38
8-5.   Schematic Diagram –Main Section– .......................... 41
8-6.   Schematic Diagram –Digital Section– ....................... 46
8-7.   Printed Wiring Boards –Digital Section– ................... 51
8-8.   Printed Wiring Boards –BD : MD Section– ............... 54
8-9.   Schematic Diagram –BD : MD Section– ................... 57
8-10. Schematic Diagram –Display Section– ...................... 61
8-11. Printed Wiring Boards –Display Section– .................. 65
8-12. Schematic Diagram –BD : CD Section– .................... 70
8-13. Printed Wiring Boards –BD : CD Section– ................ 73
8-14. IC Block Diagram ....................................................... 75
9.
EXPLODED VIEWS
9-1. Cabinet Section ............................................................. 79
9-2. Chassis Section-1 .......................................................... 80
9-3. Chassis Section-2 .......................................................... 81
9-4. MD Mechanism Section (MDM-2ER) ......................... 82
9-5. Base Unit Section (MD) (MBU-2) ............................... 83
9-6. CD Mechanism Section-1 (CMD-5BD19) ................... 84
9-7. CD Mechanism Section-1 (CMD-5BD19) ................... 85
10. ELECTRICAL PARTS LIST
............................................ 86
Amplifier section
DIN power output
30 W + 30 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output
US, Canadian model :
30 W + 30 W
(6 ohms at 40Hz-16kHz, 1.0% THD)
35 W + 35 W
(6 ohms at 1kHz, 5% THD)
POPO 350W
Except US, Canadian model :
40 W + 40 W
(6 ohms at 1 kHz, lO% THD)
Music power output
70W+70W
(6 ohms at 1 kHz. lO% THD)
Inputs
TAPE (phono jacks):
voltage 250 mV
impedance 47 kilohms
Outputs
TAPE (phono jacks):
  voltage 250 mV
  impedance 1 kilohms
PHONES (stereo phone jack):
  accepts headphones of 8 ohms
  or more.
Supplied accessories
Sony RM-SMJI Remote (1)
Sony lithium battery. CR2025 (1 )
FM lead aerial (1)
AM loop aerial (1)
Speaker cords (2)
General
Power requirements
 
 
Destination
Power
Power
requirements
consumption
 
 US, Canadian model
120V AC,60Hz
      95W
  AEP, UK, German
220-230V AC, 50/60Hz
      
95W
  Italian model
  
E, Singapore,
110-120V/ 220-240V AC,
  
Hong Kong model
50/60Hz Adjustable with
      95W
the  Voltage Selector
Dimensions
Approx. 430 x 95 x 290 mm
(17 x 3
3
/
4
 x 11 
1
/
2
 inches) (w/h/d)
incl. projecting parts and controls
Mass
Approx. 7.0 kg (15 Ib 7 oz)
Design and specifications are subject to
change without notice.
– 3 –
MODEL NO. HCD-MJ1
MODEL IDENTIFICATION
US, Canadian model
: AC120V 
⁄60Hz
AEP, UK, German, Italian model
: AC220-230V 
⁄50/60Hz
Hong kong, Sinagpore mdel
: AC110-120V/AC220-240V 
⁄50/60Hz
FLAT COMPONENT SYSTEM
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This Compact Disc player is
classified as a CLASS 1 LASER
product.
The CLASSLASER
PRODUCT label is located on
the rear exterior.
For customers in Europe
This caution la-
bel is located
insuide the unit.
CAUTION
Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation expo-
sure.
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 0.5mA (500 microampers).
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” indication is
0.75V, so analog meters must have an accurate low-voltage
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 2V AC range are suitable. (See Fig. A)
Earth Ground
Fig. A.  Using an AC voltmeter to check AC leakage.
AC 
Voltmeter
(0.75V)
0.15
µ
F
1.5k
To Exposed Metal
Parts on Set
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 
OR DOTTED LINE
WITH MARK 
!
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 
!
 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
– 4 –
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
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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
more than 30 cm away from the  objective lens.
Cautions when replacing IC121 and
IC171 on the BD board
A change has been made from CXD2535BR due to a modification of
IC121 on the BD board in this unit.
Accompanying this modification, a portion of the nonü]volatile
memory of IC171 (XC24CO1S) has been changed.
Conversely, when IC121 has been replaced, use CXD2535BR and
rewrite the contents of IC171.
Contents of non-volatile memories CXD2535BR
Address
CXD2535BR
15
93
2D
1A
2E
1A
Rewrite Procedure for Non-volatile Memory
(1) With the power switched off and the power plug plugged into a
socket. press the BASS/TREBLE button. CLOCK button, and MD
button more than one at a time in order.
(2) Rotate the JOG dial knob and display the “EEP MODE”.
When you press the YES key, the display changes to show
“EEP**@@”.
(Here, **indicates the address, and @@ indicates the data.)
(3) Rotate the JOG dial knob and display the  “EEP 15 @@”.
(4) When you press the CD SYNCHRO button, “EEP 15 @@>@@”
is displayed so then turn the JOG dial knob to show ügEEP 15
@@>93”
(5) Press the YES key and “COMPLETE” will appear for a moment
and data shown as “EEP 15 93” is being rewritten.
(6) Rewrite address 2D and address 2E, into 1A using steps (3) to (5)
above.
(7) When all changes are complete, press the NO key and display
“EEP MODE”.
(8)Press the REPEAT button. If no disc is loaded, the time is dis-
played, so unplug the power plug. If a disc is loaded, the disc is
ejected, then the time is displayed. Unplug the power plug from
the socket to end EEP rewrite mode. (See “How to end test mode”
below.)
Note:
Changes in the contents of non-volatile memory are not re-
flected until the power is switched off, then on.
HOW TO END TEST MODE
Method :
l
Press the REPEAT button.
2 If no disc is loaded, the time is displayed. If a disc is loaded, the
disc is ejected, then the time is displayed .
3 Unplug the power plug from the socket.
ENTERING TEST MODE
      
              
When you press the  DISP  button, 
p button, and  EDIT button at the
same tilne, the system goes into key, fluorescent tube, jogr and LED
check mode.
r
Fluorescent tube check
       
All the lights light up. Then, each time you press the ENTER but-
ton, the display mode changes as shown below.
nAll lit n partially lit l n partially lit 2
r
LED check
When you turn the jog dial, the LEDS change froln all lit to indi-
vidually lit.
r
Key check
      
The EDIT/NO button puts the system into key/jog check mode .
When you press a button, the number is counted up.
However, pressing a button again that you already pressed does
not count up the number.
Turning the jog dial to the right increases the jog count display,
turning the jog dial to the left decreases the jog count.
When you have pressed all the buttons and “KEY= 0K” is dis-
played, pressing any button ends test Inode.
Page of 67
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