CX-JN44, JAX-S44 - Sony Audio Service Manual (repair manual)

cx-jn44, jax-s44 service manual
Model
CX-JN44 JAX-S44
Pages
70
Size
5.12 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cx-jn44-jax-s44.pdf
Date

Read Sony CX-JN44 / JAX-S44 Service Manual online

SERVICE MANUAL
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
US Model
Canadian Model
COMPACT DISC DECK RECEIVER
9-877-749-03
2005E05-1
© 2005.05
Ver. 1.2  2005.05
SPECIFICATIONS
CX-JN44
Main unit
Amplifier section
AUDIO POWER SPECIFICATIONS
(USA models only)
POWER OUTPUT AND TOTAL HARMONIC 
DISTORTION:
With 6 ohm loads, both channels driven, from 
120 – 10,000 Hz: rated 140 watts per channel 
minimum RMS power, with no more than 10% 
total harmonic distortion from 250 milliwatts to 
rated output.
Continuous RMS power output (reference):
140 + 140 watts (6 ohms at 
1 kHz, 10% THD)
Total harmonic distortionless than 0.07% (6 ohms at 
1kHz, 60 W)
Inputs
VIDEO/MD IN (phono jacks):
voltage 450/250 mV, 
impedance 47 kilohms
Outputs
PHONES (stereo mini jack):
accepts headphones of 
8ohms or more
SPEAKER:
accepts impedance of 6 to 
16 ohms
CD player section
System
Compact disc and digital 
audio system
Laser
Semiconductor laser 
(
λ=780 nm)
Emission duration: 
continuous
Frequency response
2 Hz – 20 kHz (
±0.5 dB)
Signal-to-noise ratio
More than 90 dB
Dynamic range
More than 90 dB
Tape deck section
Recording system
4-track 2-channel, stereo
Frequency response
50 – 13,000 Hz (
±3 dB), 
using Sony TYPE I 
cassettes
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
87.5 – 108.0 MHz
(100-kHz step)
Antenna
FM lead antenna
Antenna terminals
75 ohms unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
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
Antenna terminals
External antenna terminal
Intermediate frequency
450 kHz
General
Power requirements
120 V AC, 60 Hz
Power consumption
USA models:
205 watts
Canadian models:
260 VA
Dimensions (w/h/d) incl. projecting parts and controls 
Amplifier/Tuner/Tape/CD section:
Approx. 280 
× 325 ×
425 mm
Mass 
Approx. 9.8 kg
Design and specifications are subject to change 
without notice.
CX-JN44 is the amplifier, CD player, tape deck
and tuner section in JAX-S44.
Model Name Using Similar Mechanism
NEW
CD
CD Mechanism Type
CDM74-K6BD80
Section
Base Unit Name
BU-K6BD80A
Optical Pick-up Name
KSM-213DAP
Tape deck
Model Name Using Similar Mechanism
NEW
Section
Tape Transport Mechanism Type
CWM43FF13
2
CX-JN44
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.
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.
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
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.
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. 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 0.75 V, 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 2 V AC range are suitable.  (See
Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
ATTENTION  AU  COMPOSANT  AYANT  RAPPORT
À  LA  SÉCURITÉ!
LES  COMPOSANTS  IDENTIFIÉS  PAR  UNE  MARQUE  
0
 SUR
LES  DIAGRAMMES  SCHÉMATIQUES  ET  LA  LISTE  DES
PIÈCES  SONT  CRITIQUES  POUR  LA  SÉCURITÉ  DE
FONCTIONNEMENT.  NE  REMPLACER  CES  COM-  POSANTS
QUE  PAR  DES  PIÈCES  SONY  DONT  LES  NUMÉROS  SONT
DONNÉS  DANS  CE  MANUEL  OU  DANS  LES  SUPPLÉMENTS
PUBLIÉS  PAR  SONY.
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
3
CX-JN44
TABLE OF CONTENTS
7.
EXPLODED VIEWS
7-1.
Case Section .................................................................... 50
7-2.
Tape Mechanism Deck Section (CWM43FF13) ............. 51
7-3.
Cassette Box Section ....................................................... 52
7-4.
Front Panel Section ......................................................... 53
7-5.
Back Panel Section .......................................................... 54
7-6.
Chassis Section ................................................................ 55
7-7.
CD Mechanism Deck Section-1 (CDM74-K6BD80) ..... 56
7-8.
CD Mechanism Deck Section-2 (CDM74-K6BD80) ..... 57
7-10. CD Mechanism Deck Section-3 (CDM74-K6BD80) ..... 58
7-11. Base Unit Section (BU-K6BD80A) ................................ 59
8.
ELECTRICAL PARTS LIST
.................................. 60
1.
SERVICING NOTES
................................................
4
2.
GENERAL
...................................................................
7
3.
DISASSEMBLY
3-1.
Disassembly Flow ...........................................................
9
3-2.
Case (Side-L/R) ............................................................... 10
3-3.
Case (Top) ....................................................................... 10
3-4.
Tray Panel ........................................................................ 11
3-5.
CD Mechanism Deck (CDM74-K6BD80) ...................... 11
3-6.
Front Panel Block ............................................................ 12
3-7.
Back Panel Section .......................................................... 12
3-8.
MAIN Board .................................................................... 13
3-9.
Tape Mechanism Deck (CWM43FF13) .......................... 13
3-10. Table Assy ....................................................................... 14
3-11. MOTOR (TB) Board ....................................................... 14
3-12. MOTOR (LD) Board ....................................................... 15
3-13. Base Unit (BU-K6BD80A) ............................................. 15
3-14. Motor Gear Assy (SLED) (M102), CD Board ................ 16
3-15. Optical Pick-up (KSM-213DAP) .................................... 16
4.
TEST MODE
............................................................... 17
5.
ELECTRICAL CHECK
............................................ 21
6.
DIAGRAMS
6-1.
Block Diagram  – SERVO Section – ............................... 22
6-2.
Block Diagram  – MAIN Section – ................................. 23
6-3.
Block Diagram
– PANEL/POWER SUPPLY Section – ........................... 24
6-4.
Printed Wiring Board  – BD Board – .............................. 26
6-5.
Schematic Diagram  – BD Board – ................................. 27
6-6.
Printed Wiring Boards  – CHANGER Section – ............. 28
6-7.
Schematic Diagram  – CHANGER Section – ................. 29
6-8.
Printed Wiring Board
– CDMP3 CONNECT Board – ....................................... 30
6-9.
Schematic Diagram
– CDMP3 CONNECT Board – ....................................... 31
6-10. Schematic Diagram  – MAIN Section (1/4) – ................. 32
6-11. Schematic Diagram  – MAIN Section (2/4) – ................. 33
6-12. Schematic Diagram  – MAIN Section (3/4) – ................. 34
6-13. Schematic Diagram  – MAIN Section (4/4) – ................. 35
6-14. Printed Wiring Boards  – MAIN Section – ..................... 36
6-15. Printed Wiring Board  – PANEL Section – ..................... 37
6-16. Schematic Diagram  – PANEL Section (1/2) – ............... 38
6-17. Schematic Diagram  – PANEL Section (2/2) – ............... 39
6-18. Printed Wiring Board  – POWER AMP Section – .......... 40
6-19. Schematic Diagram  – POWER AMP Section – ............. 41
6-20. Printed Wiring Boards  – TRANS Section – ................... 42
6-21. Schematic Diagram  – TRANS Section – ....................... 43
6-22. IC Pin Function Description ............................................ 47
4
CX-JN44
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 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.
Page of 70
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