Sony CDX-C8850 - Fm/am Compact Disc Player User manual

1
Model Name Using Similar Mechanism CDX-C880
CD Drive Mechanism Type MG-363S-121
Optical Pick-up Name KSS-521A
SERVICE MANUAL
US Model
CDX-C8850
E Model
CDX-C9500
CDX-C8850/C9500
FM/AM COMPACT DISC PLAYER
Other Specifications
CD player section
System Compact disc digital audio
system
Signal-to-noise ratio 98 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 CDX-C8850:
87.5 – 107.9 MHz
CDX-C9500:
FM tuning interval:
50 kHz/200 kHz switchable
87.5 – 108.0 MHz
(at 50 kHz step)
87.5 – 107.9 MHz
(at 200 kHz step)
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
SPECIFICATIONS
AM
Tuning range CDX-C8850:
530 – 1,710 kHz
CDX-C9500:
AM tuning interval:
9 kHz/10 kHz switchable
531 – 1,602 kHz
(at 9 kHz step)
530 – 1,710 kHz
(at 10 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 45 W ×4 (at 4 ohms)
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUTAND 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
Photo: CDX-C9500
– Continued on next page –

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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.
General
Outputs Line outputs (3)
Power antenna relay
control lead
Power amplifier control
lead
Telephone ATT control
lead
Illumination control lead
Equalizer ±12 dB; f0= 62 Hz, 157 Hz,
396 Hz, 1.0 kHz, 2.51 kHz,
6.34 kHz, 16 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-X4V (1)
Wireless remote RM-X47 (1)
(CDX-C8850)
Card remote commander
RM-X49 (1) (CDX-C9500)
Microphone (1)
Parts for installation and
connections (1 set)
Front panel case (1)
Design and specifications are subject to change without
notice.

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TABLE OF CONTENTS
1. GENERAL
Location of controls................................................................. 4
Getting Started......................................................................... 4
Setting the clock ...................................................................... 5
CD Player ................................................................................ 5
Radio ....................................................................................... 6
Voice Drive .............................................................................. 7
Voice Memo............................................................................. 7
DSP.......................................................................................... 7
Other Functions ....................................................................... 9
CD/MD Unit ............................................................................ 9
TV/Video ............................................................................... 11
Additional Information .......................................................... 12
Connections ........................................................................... 13
2. DISASSEMBLY
2-1. Sub Panel Assy .................................................................. 15
2-2. Mechanism Block ............................................................. 15
2-3. Main Board, Power Board................................................. 16
2-4. Heat Sink ........................................................................... 16
2-5. Chassis (T) Sub Assy ........................................................ 17
2-6. Lever Assy ......................................................................... 17
2-7. Servo Board....................................................................... 18
2-8. Roller Assy ........................................................................ 18
2-9. Chassis (OP) (O/S) Assy ................................................... 19
2-10. Optical Pick-up Block ....................................................... 19
3. ELECTRICAL ADJUSTMENTS
Tuner Section......................................................................... 20
4. DIAGRAMS
4-1. IC Pin Descriptions ........................................................... 23
4-2. Block Diagram –CD Section–........................................... 35
4-3. Block Diagram –Display Section–.................................... 36
4-4. Block Diagram –Tuner Section– ....................................... 37
4-5. Circuit Boards Location .................................................... 38
4-6. Schematic Diagram –CD Mechanism Section (1/3)– ....... 39
4-7. Schematic Diagram –CD Mechanism Section (2/3)– ....... 40
4-8. Schematic Diagram –CD Mechanism Section (3/3)– ....... 41
4-9. Printed Wiring Boards –CD Mechanism Section–............ 42
4-10. Printed Wiring Board –Main Section– .............................. 44
4-11. Schematic Diagram –Main Section (1/5)– ........................ 46
4-12. Schematic Diagram –Main Section (2/5)– ........................ 47
4-13. Schematic Diagram –Main Section (3/5)– ........................ 48
4-14. Schematic Diagram –Main Section (4/5)– ........................ 49
4-15. Schematic Diagram –Main Section (5/5)– ........................ 50
4-16. Schematic Diagram –Power Section– ............................... 51
4-17. Printed Wiring Board –Power Section– ............................ 52
4-18. Printed Wiring Board –Relay Section– ............................. 53
4-19. Schematic Diagram –Relay Section–................................ 54
4-20. Schematic Diagram –Display Section–............................. 55
4-21. Printed Wiring Board –Display Section– .......................... 56
5. EXPLODED VIEWS
5-1. Chassis Section ................................................................. 63
5-2. Front Panel Section ........................................................... 64
5-3. CD Mechanism Section (1) ............................................... 65
5-4. CD Mechanism Section (2) ............................................... 66
5-5. CD Mechanism Section (3) ............................................... 67
6. ELECTRICAL PARTS LIST ........................................ 68

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SECTION 1
GENERAL This section is extracted
from instruction manual.

5

6

7

8

9

10

11

12

13

14

15
1 B 2.6x3
2 B 2.6x3
5 PTP 2.6x6
3 CN201
4 mechanism block
6 bracket (mechanism deck)
3 PTT 2.6x6
7 sub panel assy
6 CN251
5 claw
1 PTT 2.6x6
2 PTT 2.6x6
4 claws
Note : Follow the disassembly procedure in the numerical order given.
2-1. SUB PANEL ASSY
SECTION 2
DISASSEMBLY
2-2. MECHANISM BLOCK

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7 PTT 2.6x10
9 heat sink
1 CN101
2 CN291
3 PTT 2.6x10
4 cord (with connector) (ANTENNA)
5 cord (with connector) (RCA)
(SUB OUT)
6 PTT 2.6x10
8 PTT 2.6x10
2 PTT 2.6x1
0
3 ground point screws
(PTT 2.6x6)
1 PTT 2.6x10
6 MAIN board
9 POWER board
8 bracket (power)
claws
claws
5 CN401
7 sheet (insulating)
4 ground point screw
(PTT 2.6x6)
2-3. MAIN BOARD, POWER BOARD
2-4. HEAT SINK

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5 guide (disc)
1 PS 2x4
6 lever (R) assy
7 lever (L) assy
2 DISC IN SW board
4 claws
3 tension spring (LR)
2 P 2x3
5 chassis (T) sub assy
1 P 2x3
3 P 2x3
4 claw
2-5. CHASSIS (T) SUB ASSY
2-6. LEVER ASSY

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5 LOAD SW board
4 PS 2x3
1 tension spring (RA)
2 arm (roller)
3 roller assy
washer arm washer
Fig. 1
armwashers
2 PS 2x4
3 heat sink
7 CN2
!¡ SERVO board
0 PS 2x4
5 P 2x3
6 loading motor assy
1 PS 2x4
8 CN5
9 CN4
4 wire
2-7. SERVO BOARD
2-8. ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)

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1 P 2x3
2 sled motor assy
3 optical pick-up block
6 chassis (OP) (O/S) assy
7 compression spring (FL)
4 Fit lever (D) in the
direction of the arrow.
3 damper (T)
2 damper (T)
5 Turn loading ring in the
direction of the arrow.
1 tension spring (angle)
8 compression spring (FL)
2-9. CHASSIS (OP) (O/S) ASSY
2-10. OPTICAL PICK-UP BLOCK

20
SHUF
SHUF
SHUF
FM RF signal
generator antenna
terminal
0.01
µ F
set
SECTION 3
ELECTRICAL ADJUSTMENTS
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
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button : FM 97.9 (MHz)
FREQUENCY SELECT switch (CDX-C9500) : FM200K
3. Push the preset 3 button.
Display
4. Adjust with the volume RV2 on TU101 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
CD SECTION
CD section adjustments are done automatically in this set.
TUNER SECTION
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 AMAuto Scan/Stop Level 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 LevelAdjustment
0 dB = 1 µV
Adjustment Location : See page 22.