Sony CDXC-6850 Service manual
CDX-C6850
SERVICE MANUAL
SPECIFICATIONS
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
17 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.
US Model
Canadian Model
Model Name Using Similar Mechanism CDX-C5750/C5850
CD Drive Mechanism Type MG-363T-121
Optical Pick-up Name KSS-521A
Other Specifications
CD player section
System Compact disc digital audio
Signal-to-noise ratio 90 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 µW*
* 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 10 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
Harmonic distortion at 1 kHz
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 µV
system
68 dB (mono)
0.7% (stereo),
0.5% (mono)
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 40 W × 4 (at 4 ohms)
General
Outputs Line outputs (2)
Power antenna relay
control lead
Power amplifier control
lead
Telephone ATT 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 × 185 mm
(7 1/8 × 2 × 7 3/8 in.)
(w/h/d)
Mounting dimensions Approx. 182 × 53 × 162 mm
(7 1/4 × 2 1/8 × 6 1/2 in.)
(w/h/d)
Mass Approx. 1.2 kg (2 lb. 10 oz.)
Supplied accessories Parts for installation and
connections (1 set)
Front panel case (1)
Design and specifications are subject to change without
notice.
MICROFILM
FM/AM COMPACT DISC PLAYER
– 1 –
SERVICE NOTE
TABLE OF CONTENTS
CAUTION
Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous 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, observe
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.
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
P ART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
1. GENERAL
Location of controls ................................................................ 3
Getting Started ........................................................................ 3
Setting the clock ..................................................................... 3
CD Player................................................................................ 3
Radio ....................................................................................... 4
Other Functions ...................................................................... 5
CD/MD Unit ........................................................................... 6
TV/Video ................................................................................ 7
Connections ............................................................................8
2. DISASSEMBLY
2-1. Cover ................................................................................. 10
2-2. Front Panel Assy ...............................................................10
2-3. Sub Panel Assy.................................................................. 11
2-4. CD Mechanism Block ....................................................... 11
2-5. Main Board .......................................................................12
2-6. Heat Sink........................................................................... 12
2-7. Chassis (T) Sub Assy ........................................................ 13
2-8. Lever Assy.........................................................................13
2-9. Servo Board.......................................................................14
2-10. Roller Assy ........................................................................ 14
2-11. Chassis (OP) (O/S) Assy ...................................................15
2-12. Optical Pick-up Block ....................................................... 15
3. ELECTRICAL ADJUSTMENTS
Tuner Section ........................................................................ 16
CD Section ............................................................................ 19
4. DIAGRAMS
4-1. IC Pin Description............................................................. 20
4-2. Block Diagram –CD Section–...........................................23
4-3. Block Diagram –Main Section–........................................ 25
4-4. Circuit Boards Location .................................................... 27
4-5. Printed Wiring Boards –CD Mechanism Section– ........... 29
4-6. Schematic Diagram –CD Mechanism Section–................ 31
4-7. Printed Wiring Board –Main Section–..............................33
4-8. Schematic Diagram –Main Section (1/2)–........................ 37
4-9. Schematic Diagram –Main Section (2/2)–........................ 39
4-10. Printed Wiring Board –Display Section–.......................... 41
4-11. Schematic Diagram –Display Section–............................. 43
4-12. Printed Wiring Board –Relay Section–............................. 45
4-13. Schematic Diagram –Relay Section– ................................ 47
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES 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.
5. EXPLODED VIEWS
5-1. Chassis Section .................................................................52
5-2. Front Panel Section ........................................................... 53
5-3. CD Mechanism Section (1)............................................... 54
5-4. CD Mechanism Section (2)............................................... 55
5-5. CD Mechanism Section (3)............................................... 56
6. ELECTRICAL PARTS LIST ........................................ 57
– 2 –
SECTION 1
GENERAL
This section is extracted
from instruction manual.
– 3 –
– 4 –
– 5 –
– 6 –
– 7 –
– 8 –
– 9 –
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the n umerical order given.
2-1. COVER
1
claw
3
claws
4
cover
2
claw
2-2. FRONT PANEL ASSY
3
Push the bearing (L).
4
front panel assy
1
Push the button (open).
2
Push the bearing (R).
– 10 –
2-3. SUB PANEL ASSY
1
PTT 2.6x6
2
5
PTT 2.6x6
claws
7
sub panel assy
6
4
claw
3
PTT 2.6x6
CNP800
2-4. CD MECHANISM BLOCK
7
4
CD mechanism block
1
PTT 2.6x6
bracket (M/D)
6
PTT 2.6x6
2
PTT 2.6x6
5
PTT 2.6x6
– 11 –
3
CNP700
2-5. MAIN BOARD
5
(PTT 2.6x6)
6
MAIN board
ground point screw
4
ground point screws
(PTT 2.6x6)
3
2
PTT 2.6x8
PTT 2.6x8
2-6. HEAT SINK
1
PTT 2.6x8
1 cord (with connector) (ANT)
5
heat sink
– 12 –
3
4
PTT 2.6x8
PTT 2.6x12
2
PTT 2.6x8
2-7. CHASSIS (T) SUB ASSY
1
Unsolder the
lead wires.
red
white
black
4
P 2x3
2
P 2x3
3
P 2x3
5
chassis (T) sub assy
2-8. LEVER ASSY
6
lever (R) assy
3
tension spring (LR)
7
lever (L) assy
5
guide (disc)
1
PS 2x4
2
DISC IN SW board
4
claws
– 13 –
2-9. SERVO BOARD
5
3
P 2x3
4
loading motor assy
PS 2x4
1
CN3
6
PS 2x4
2
CN2
7
SERVO board
2-10. ROLLER ASSY
4
PS 2x3
5
LOAD SW board
washer
arm
washer
3
2
Fig. 1
roller assy
arm (roller)
washers
arm
1
tension spring (RA)
– 14 –
2-11. CHASSIS (OP) (O/S) ASSY
8
compression spring (FL)
1
tension spring (KF1)
7
9
compression spring (FL)
2
tension spring (KR1)
5
Fit lever (D) in the
direction of the arrow.
chassis (OP) (O/S) assy
6
Turn loading ring in the
direction of the arrow.
4
damper (T)
2-12. OPTICAL PICK-UP BLOCK
1
P 2x3
2
sled motor assy
3
damper (T)
3
optical pick-up block
– 15 –
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB = 1 µV
Cautions during repair
When the tuner unit is defective, replace it by a new one
because its internal block is difficult to repair.
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM Auto Scan/Stop Le vel adjustments can be
performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “OFF” mode.
2. Push the preset 4 button.
3. Push the preset 5 button.
4. Press the preset 1 button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
<Release the Test Mode>
1. Push the OFF button.
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment (WIDE)
3. FM Stereo Separation Adjustment (NARROW)
4. AM Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button : FM
FM RF signal
generator
antenna
µ
terminal
F
0.01
Carrier frequency : 97.9 MHz
Output level : 22 dB (12.6 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode.
2. Push the SOURCE button and set to FM.
Display
SHUF
3. Push the preset 3 button.
Display
set
SHUF
4. Adjust with the volume RV2 on TU601 so that the “FM”
indication turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
Display
SHUF
Adjustment Location : See page 18.
– 16 –
FM Stereo Separation Adjustment (WIDE)
Setting :
SOURCE button: FM1
FM Stereo Separation Adjustment (NARROW)
Setting :
SOURCE button : FM1
FM RF signal
generator
0.01
Carrier frequency : 97.9 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main : 1 kHz, 33.75 kHz deviation (45%)
sub : 1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot : 7.5 kHz deviation (10%)
antenna
terminal
µ
F
set
LINE OUT REAR
10 k
level meter
Ω
Procedure :
FM stereo
signal generator
output channel
Level meter Level meter
connection reading (dB)
L-CH L-CH A
B
R-CH L-CH Adjust RV3 on TU601
for minimum reading.
R-CH R-CH C
D
L-CH R-CH Adjust RV3 on TU601
for minimum reading.
L-CH stereo separation : A – B
R-CH stereo separation : C – D
The separations of both channels should be equal.
Specification : Separation more than 24 dB
Adjustment Location : See page 18.
FM RF signal
generator
0.01
Carrier frequency : 97.9 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main : 1 kHz, 33.75 kHz deviation (45%)
sub : 1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot : 7.5 kHz deviation (10%)
antenna
terminal
µ
F
set
LINE OUT REAR
10 k
level meter
Ω
Procedure :
1. Push the SHIFT button.
2. Push the 4 button three times.
3. Push the 5 button twice and set to NARROW mode.
FM stereo
signal generator
output channel
Level meter Level meter
connection reading (dB)
L-CH L-CH A
B
R-CH L-CH Adjust RV4 on TU601
for minimum reading.
R-CH R-CH C
D
L-CH R-CH Adjust RV4 on TU601
for minimum reading.
L-CH stereo separation : A – B
R-CH stereo separation : C – D
The separations of both channels should be equal.
Specification : Separation more than 18 dB
Adjustment Location : See page 18.
– 17 –
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