CX-JN77, JAX-N77, JAX-PK77 — Sony Audio Service Manual (repair manual)

Model
CX-JN77 JAX-N77 JAX-PK77
Pages
80
Size
6.28 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cx-jn77-jax-n77-jax-pk77.pdf
Date

View Sony CX-JN77 / JAX-N77 / JAX-PK77 Service Manual online

SERVICE MANUAL
Chilean, Peruvian, Mexican models
DIN power output (rated): 100 + 100 watts (6 ohms at 
1 kHz, DIN)
Continuous RMS power output (reference):
125 + 125 watts (6 ohms at 
1 kHz, 10% THD)
Music power output (reference):
250 + 250 watts (6 ohms at 
1 kHz, 10% THD)
AEP, UK, CIS models
The following measured at AC 120, 127, 220, 240 V 
50/60 Hz
DIN power output (rated): 144 + 144 watts (6 ohms at 
1 kHz, DIN)
Continuous RMS power output (reference):
180 + 180 watts (6 ohms at 
1 kHz, 10% THD)
Inputs
VIDEO/MD IN (phono jacks):
voltage 450/250 mV, 
impedance 47 kilohms
Amplifier section
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
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
Russian models
65.0 – 74.0 MHz
(There is no stereo effect. 
10-kHz step)
87.5 – 108.0 MHz
(50-kHz step)
Other models
87.5 – 108.0 MHz
(50-kHz step)
Antenna
FM lead antenna
Antenna terminals
75 ohms unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
Pan-American models:
530 – 1,710 kHz 
(with the tuning interval 
set at 10 kHz)
531 – 1,710 kHz 
(with the tuning interval 
set at 9 kHz)
European and Russian models:
531 – 1,602 kHz (with the 
tuning interval set at 
9 kHz)
Antenna
AM loop antenna
Antenna terminals
External antenna terminal
Intermediate frequency
450 kHz 
COMPACT DISC DECK RECEIVER
AEP Model
UK Model
E Model
CX-JN77
Ver. 1.2  2005.05
9-877-745-03
Sony Corporation
2005E05-1
Personal Audio Group
© 2005.05
Published by Sony Engineering Corporation
SPECIFICATIONS
CX-JN77 is the amplifier, CD player, tape deck
and tuner section in JAX-N77/PK77.
Model Name Using Similar Mechanism
NEW
CD
CD Mechanism Type
CDM74-F1BD81
Section
Base Unit Name
BU-F1BD81A
Optical Pick-up Block Name
KSM-215DCP
Tape deck
Model Name Using Similar Mechanism
NEW
Section
Tape Transport Mechanism Type
CWM43FR34
– Continued on next page –
CX-JN77
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.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
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.
General
Power requirements
European and Russian models:
230 V AC, 50/60 Hz
Mexican models:
127 V AC, 60 Hz
Other models:
120 V, 220 V or 
230 – 240 V AC, 50/60 Hz
Adjustable with voltage 
selector
Power consumption
European and Russian models:
180 watts
0.25 watts (at the Power 
Saving Mode)
Other models:
170 watts
Dimensions (w/h/d) incl. projecting parts and controls 
Amplifier/Tuner/Tape/CD section:
Approx. 280 
× 325 ×
425 mm
Mass Approx. 
9.9 
kg
Design and specifications are subject to change 
without notice.
CX-JN77
3
TABLE  OF  CONTENTS
1.
SERVICING NOTES
................................................
4
2.
GENERAL
Location of Controls .......................................................
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-F1BD81) ...................... 11
3-6. Front Panel Block ............................................................ 12
3-7. Back Panel Section .......................................................... 12
3-8. MAIN Board ................................................................... 13
3-9. Tape Mechanism Deck (CWM43FR34) ......................... 13
3-10. Table Assy ....................................................................... 14
3-11. MOTOR (TB) Board ....................................................... 14
3-12. MOTOR (LD) Board ....................................................... 15
3-13. Base Unit (BU-F1BD81A) ............................................. 15
3-14. CD Board ......................................................................... 16
4.
TEST  MODE
.............................................................. 17
5.
ELECTRICAL  ADJUSTMENTS
CD Section ...................................................................... 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. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 25
6-5. Printed Wiring Board  – CD Board – ............................. 26
6-6. Schematic Diagram  – CD Board – ................................ 27
6-7. Printed Wiring Boards  – CHANGER Section – ............ 28
6-8. Schematic Diagram  – CHANGER Section – ................ 29
6-9. Printed Wiring Boards
– CDMP3 CONNECT/TRANSLATION Boards – ........ 30
6-10. Schematic Diagram
– CDMP3 CONNECT/TRANSLATION Boards – ........ 31
6-11. Schematic Diagram  – MAIN Section (1/4) – ................ 32
6-12. Schematic Diagram  – MAIN Section (2/4) – ................ 33
6-13. Schematic Diagram  – MAIN Section (3/4) – ................ 34
6-14. Schematic Diagram  – MAIN Section (4/4) – ................ 35
6-15. Printed Wiring Boards  – MAIN Section – .................... 36
6-16. Printed Wiring Board  – PANEL Section – .................... 37
6-17. Schematic Diagram  – PANEL Section (1/2) – .............. 38
6-18. Schematic Diagram  – PANEL Section (2/2) – .............. 39
6-19. Printed Wiring Board  – POWER AMP Section –
(AEP, UK, CIS only) ....................................................... 40
6-20. Schematic Diagram  – POWER AMP Section –
(AEP, UK, CIS only) ....................................................... 41
6-21. Printed Wiring Board  – POWER AMP Section –
(E51, MX only) ............................................................... 42
6-22. Schematic Diagram  – POWER AMP Section –
(E51, MX only) ............................................................... 43
6-23. Printed Wiring Boards  – TRANS Section –
(AEP, UK, CIS only) ....................................................... 44
6-24. Schematic Diagram  – TRANS Section –
(AEP, UK, CIS only) ....................................................... 45
6-25. Printed Wiring Boards  – TRANS Section –
(E51, MX only) ............................................................... 46
6-26. Schematic Diagram  – TRANS Section –
(E51, MX only) ............................................................... 47
7.
EXPLODED  VIEWS
7-1. Case Section .................................................................... 58
7-2. Tape Mechanism Deck Section (CWM43FR34) ............ 59
7-3. Cassette Box Section ...................................................... 60
7-4. Front Panel Section ......................................................... 61
7-5. Back Panel Section .......................................................... 62
7-6. Chassis Section ............................................................... 63
7-7. CD Mechanism Deck Section-1 (CDM74-F1BD81) ..... 64
7-8. CD Mechanism Deck Section-2 (CDM74-F1BD81) ..... 65
7-9. CD Mechanism Deck Section-3 (CDM74-F1BD81) ..... 66
7-10. Base Unit Section (BU-F1BD81A) ................................ 67
8.
ELECTRICAL  PARTS  LIST
............................... 68
• Abbreviation
E51
: Chilean and Peruvian models
MX
: Mexican model
4
CX-JN77
+
+
R
L
R
L
– Rear View –
PART No.
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.
MODEL  IDENTIFICATION
MODEL
PART No.
AEP, UK models
4-253-949-0
[]
CIS model
4-253-950-0
[]
Chilean and Peruvian models
4-253-951-0
[]
Mexican model
4-255-500-0
[]
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Here you can view online or download Sony CX-JN77 / JAX-N77 / JAX-PK77 Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony CX-JN77 / JAX-N77 / JAX-PK77 Audio. Information contained in Sony CX-JN77 / JAX-N77 / JAX-PK77 service manual (repair manual) typically includes:

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  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).