CDX-C7850 - Sony Car Audio Service Manual (repair manual)

Model
CDX-C7850
Pages
68
Size
6.65 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
cdx-c7850-1.pdf
Date

View Sony CDX-C7850 Service Manual online

– 1 –
Model Name Using Similar Mechanism
CDX-C680/C780
CD Drive Mechanism Type
MG-363S-121
Optical Pick-up Name
KSS-521A
SERVICE MANUAL
US Model
Canadian Model
CDX-C7850
FM/AM COMPACT DISC PLAYER
Other Specifications
CD player section
System
Compact disc digital audio
system
Signal-to-noise ratio
99 dB
Frequency response
10 – 20,000 Hz
Wow and flutter
Below measurable limit
Laser Diode Properties
   Material
GaAlAs
   Wavelength
780 nm
   Emission Duration
Continuous
   Laser output power
Less than 44.6 
µ
W*
* This output is the value measured at a distance
   of 200 mm from the objective lens surface on
   the Optical Pick-up Block.
Tuner section
FM
Tuning range
87.5 – 107.9 MHz
Antenna terminal
External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity
8 dBf
Selectivity
75 dB at 400 kHz
50 dB at 200 kHz
Signal-to-noise ratio
65 dB (stereo),
68 dB (mono)
Harmonic distortion at 1 kHz
0.7% (stereo),
0.4% (mono)
Separation
35 dB at 1 kHz
Frequency response
30 – 15,000 Hz
AM
Tuning range
530 – 1,710 kHz
Antenna terminal
External antenna connector
Intermediate frequency 10.71 MHz / 450 kHz
Sensitivity
30 
µ
V
SPECIFICATIONS
Power amplifier section
Outputs
Speaker outputs
(sure seal connectors)
Speaker impedance
4 – 8 ohms
Maximum power output 45 W 
×
 4 (at 4 ohms)
General
Outputs
Line outputs (3)
Power antenna relay
control lead
Power amplifier control
lead
Telephone ATT control
lead
Illumination control lead
Tone controls
Bass 
±
8 dB at 100 Hz
Treble 
±
8 dB at 10 kHz
Power requirements
12 V DC car battery
(negative ground)
Dimensions
Approx. 178 
×
 50 
×
 182 mm
(7 
1/8
 
×
 2 
×
 7 
1/4
 in.)
(w/h/d)
Mounting dimension
Approx. 182 
×
 53 
×
 163 mm
(7 
1/4
 
×
 2 
1/8
 
×
 6 
1/2
 in.)
(w/h/d)
Mass
Approx. 1.4 kg (3 lb. 1 oz.)
Supplied accessories
Rotary commander (RM-X4S) (1)
Wireless remote (RM-X47) (1)
Parts for installation and
connections (1 set)
Front panel case (1)
Design and specifications are subject to change without
notice.
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
19 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more
than 1% total harmonic distortion.
MICROFILM
– 2 –
TABLE OF CONTENTS
1. GENERAL
Location of controls ................................................................. 3
Getting Started ......................................................................... 3
Setting the clock ...................................................................... 3
CD Player ................................................................................ 4
Radio ....................................................................................... 5
Other Functions ....................................................................... 5
CD/MD Unit ............................................................................ 6
TV/Video ................................................................................. 8
Connections ........................................................................... 10
2. DISASSEMBLY
2-1.   Cover ................................................................................. 12
2-2.   Front Panel Assy ............................................................... 12
2-3.   Sub Panel Assy .................................................................. 13
2-4.   Mechanism Block ............................................................. 13
2-5.   Main Board ....................................................................... 14
2-6.   Heat Sink ........................................................................... 14
2-7.   Chassis (T) Sub Assy ........................................................ 15
2-8.   Lever Assy ......................................................................... 15
2-9.   Servo Board ....................................................................... 16
2-10. Roller Assy ........................................................................ 16
2-11. Chassis (OP) (O/S) Assy ................................................... 17
2-12. Optical Pick-up Block ....................................................... 17
3. ELECTRICAL ADJUSTMENTS
Tuner Section ......................................................................... 18
4. DIAGRAMS
4-1.   IC Pin Descriptions ........................................................... 21
4-2.   Block Diagram –CD Section– ........................................... 29
4-3.   Block Diagram –Display Section– .................................... 31
4-4.   Block Diagram –Tuner Section– ....................................... 33
4-5.   Circuit Boards Location .................................................... 35
4-6.   Schematic Diagram –CD Mechanism Section (1/3)– ....... 37
4-7.   Schematic Diagram –CD Mechanism Section (2/3)– ....... 39
4-8.   Schematic Diagram –CD Mechanism Section (3/3)– ....... 41
4-9.   Printed Wiring Boards –CD Mechanism Section– ............ 44
4-10. Printed Wiring Board –Main Section– .............................. 47
4-11. Schematic Diagram –Main Section (1/4)– ........................ 51
4-12. Schematic Diagram –Main Section (2/4)– ........................ 53
4-13. Schematic Diagram –Main Section (3/4)– ........................ 55
4-14. Schematic Diagram –Main Section (4/4)– ........................ 57
4-15. Printed Wiring Board –Display Section– .......................... 59
4-16. Schematic Diagram –Display Section– ............................. 61
4-17. Printed Wiring Board –Relay Section– ............................. 63
4-18. Schematic Diagram –Relay Section– ................................ 65
5. EXPLODED VIEWS
5-1.   Chassis Section ................................................................. 70
5-2.   Front Panel Section ........................................................... 71
5-3.   CD Mechanism Section (1) ............................................... 72
5-4.   CD Mechanism Section (2) ............................................... 73
5-5.   CD Mechanism Section (3) ............................................... 74
6. ELECTRICAL PARTS LIST
........................................ 75
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.
SERVICE NOTE
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
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.
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, ob-
serve from more than 30 cm away from the objective lens.
NOTES ON PICK-UP FLEXIBLE BOARD
The pick-up flexible board in this set is secured to the optical pick-
up with an adhesive tape. Once the tape is removed, an adhering
force becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pick-
up flexible board with a new one.
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.
– 3 –
SECTION 1
GENERAL
This section is extracted
from instruction manual.
– 4 –

Download Sony CDX-C7850 Service Manual (Repair Manual)

Here you can view online and download Sony CDX-C7850 Service Manual in PDF. Usually contens schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb. This Service Manual can help you recover, restore, fix, disassemble and repair Sony CDX-C7850 Car Audio.