Sony DCS-901 Service manual

D-CS901
SERVICE MANUAL
Ver 1.0 2002. 06
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
Model Name Using Similar Mechanism D-SJ301 CD Mechanism Type CDM-3125ER
Optical Pick-up Name DAX-25E
System
Compact disc digital audio system
Laser diode properties
Material: GaAlAs Wavelength: λ = 780 nm Emission duration: Continuous Laser output: 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 with 7 mm aperture.)
D-A conversion
1-bit quartz time-axis control
Frequency response
20 - 20 000 Hz
307)
Output (at 4.5 V input level)
Headphones (stereo minijack)
Approx. 5 mW + Approx. 5 mW at 16
Power requirements
For the area code of the model you purchased, check the upper left side of the bar code on the package.
• Sony NH-WM2AA rechargeable batteries:
2.4 V DC
•Two LR6 (size AA) batteries: 3 V DC
•AC power adaptor (DC IN 4.5 V jack): U2/CA2 model:120 V, 60 Hz CED model: 220 - 230 V, 50/60 Hz CEK model: 230 - 240 V, 50 Hz
0
dB (measured by JEITA CP-
–4.5
Battery life* (approx. hours)
(When you use the CD player on a flat and stable surface.) Playing time varies depending on how the CD player is used. Figures in brackets show the playing time of MP3 files.
When using G-PROTECTION function
“1” “2”
NH-WM2AA 22 23 (charged for [16] [16] about 5 hours**)
Two Sony alkaline 37 38 batteries LR6 (SG) [24] [24] (produced in Japan)
* Measured value by the standard of JEITA (Japan
Electronics and Information Technology Industries Association).
** Charging time varies depending on how the
rechargeable battery is used.
Operating temperature
5°C - 35°C (41°F - 95°F)
Dimensions (w/h/d) (including projecting parts and controls)
Approx. 134.1 × 38.5 × 147.8 mm (51⁄4 × 1 1⁄2 × 57⁄8 in.)
Mass (excluding accessories)
Approx. 321 g (11.4 oz.)
Supplied accessories
For the area code of the location in which you purchased the CD player, check the upper left side of the bar code on the package.
AC power adaptor (1) Headphones/earphones (1) Hand strap (1)
Design and specifications are subject to change without notice.
• Abbreviation
U2 : US model CA2 : Canadian model CED : AEP model CEK : UK model
9-874-052-01
2002F1600-1 © 2002.06
PORTABLE CD PLAYER
Sony Corporation
Personal Audio Company Published by Sony Engineering Corporation
D-CS901
TABLE OF CONTENTS
1. SERVICING NOTE··························································3
2. GENERAL ·········································································· 4
3. DISASSEMBLY ································································ 5
3-1. Lid Upper, Cabinet (Front)············································ 5 3-2. MD Assy (CDM-3125ER), MAIN Board ····················· 6 3-3. Motor Assy, Turn Table (Spindle) (M901) ····················6 3-4. Motor Assy (Sled) (M902),
Optical Pick-up (DAX-25E)·········································· 7
3-5. MAIN (SWITCH UNIT) Board, Hold Lever················ 7
4. TEST MODE ······································································ 8
5. ELECTRICAL ADJUSTMENTS ······························· 11
6. DIAGRAMS······································································ 12
6-1. Block Diagrams ··························································· 13 6-2. Printed Wiring Board – MAIN Board (Side A) –······· 15 6-3. Printed Wiring Board – MAIN Board (Side B) –······· 16 6-4. Schematic Diagram – MAIN Board (1/4) – ··············· 17 6-5. Schematic Diagram – MAIN Board (2/4) – ··············· 18 6-6. Schematic Diagram – MAIN Board (3/4) – ··············· 19 6-7. Schematic Diagram – MAIN Board (4/4) – ··············· 20 6-8. Printed Wiring Board
– MAIN (SWITCH UNIT) Board – ···························· 21
6-9. Schematic Diagram
– MAIN (SWITCH UNIT) Board – ···························· 22
6-10.IC Pin Function Descriptions ······································ 24
7. EXPLODED VIEWS ······················································ 33
6-1. Upper Lid Section ······················································· 33 6-2. Cabinet Section ··························································· 34 6-3. Cabinet Lower Section ················································ 35 6-4. Optical Pick-up Section (CDM-3125ER)···················· 36
This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.
CAUTION
Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.
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.
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.
On AC power adaptor
•Use only the AC power adaptor supplied or
recommended in “Accessories (supplied/ optional).” Do not use any other AC power adaptor. It may cause a malfunction.
Polarity of the plug
8. ELECTRICAL PARTS LIST ······································· 37
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
2
SECTION 1

SERVICING NOTE

D-CS901
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 pick­up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
BEFORE REPLACING THE OPTICAL PICK-UP BLOCK
Please be sure to check thoroughly the parameters as par the “Optical Pick-Up Block Checking Procedures” (Part No.: 9-960-027-11) issued separately before replacing the optical pick-up block. Note and specifications required to check are given below.
• FOK output: IC601 yg pin When checking FOK, remove the lead wire to disc motor.
• RF signal P-to-P value: 0.4 to 0.65 Vp-p
LASER DIODE CHECK
During normal operation of the equipment, emission of the laser diode is prohibited unless the upper lid is closed while turning ON the S801. (push switch type) The following checking method for the laser diode is operable.
• Method: Emission of the laser diode is visually checked.
1. Open the upper lid.
2. Push the S801 as shown in Fig. 1.
3. Check the object lens for confirming normal emission of the
laser diode. If not emitting, there is a trouble in the automatic power control circuit or the optical pick-up. During normal operation, the laser diode is turned ON about 2.5 seconds for focus searching.
S801
Fig. 1 Method to push the S801
3
D-CS901
SECTION 2

GENERAL

Locating the controls
For details, see pages in parentheses.
CD player (front)
1 HOLD switch
(page 19)
This section is extracted from instruction manual.
6 FOLDER –/+ buttons
(pages 9, 14)
2 3-way control key
(see below)
3 VOL* (volume)
control (page 7)
4 DC IN 4.5 V
(external power input) jack (pages 6, 22)
5 Display
(pages 8, 9, 12 - 14, 16, 18, 19)
2 3-way control key
Push toward
N/> or ..
*There is a tactile dot beside VOL to show the direction to turn up the volume. ** There is a tactile dot beside N/>.
Press x/CHG.
N/>**: Play/AMS/search
(pages 7 - 9, 14)
.: AMS/search (pages 7, 14) x/CHG: Stop/charge
(pages 7, 20, 22)
7 PLAY MODE
button (pages 11 - 15)
8 REPEAT/ENTER
button (pages 11, 12, 14, 15)
9 SOUND button
(pages 18, 19)
q; i (headphones)
jack (pages 6, 21)
qa Buckle
(page 6)
qs DISPLAY button
(pages 16, 17)
CD player (inside)
qd G-PROTECTION
switch (page 16)
qf Battery compartment
(page 22)
4
SECTION 3
SET
MOTOR ASSY (SLED)(M902), OPTICAL PICK-UP (DAX-25E)
MAIN BOARD
MAIN (SWITCH UNIT) BOARD, HOLD LEVER

LID UPPER, CABINET (FRONT)

MD ASSY (CDM-3125ER),
MOTOR ASSY, TURN TABLE (SPINDLE)(M901)

DISASSEMBLY

Note : This set can be disassembled in the order shown below.
D-CS901
Note : Follow the disassembly procedure in the numerical order given.
3-1. Lid Upper, Cabinet (Front)
3
five screws (B2)
5
cabinet (front)
1
screw
4
2
7
lid, upper
1
screw
6
flexible cable (20P)
cabinet (lower) sub assy
5
D-CS901
e
3-2. MD Assy (CDM-3125ER), MAIN Board
1
flexible cable (15P)
3
connector (CN502)(white)
RV801
lever(vol)(B)
4
5
MD ASSY (CDM-3125ER)
2
connector (CN503)(black)
7
MAIN board
3-3. Motor Assy, Turn Table (Spindle) (M901)
6
1
three screws
(B1.7x5)
motor assy, turn tabl (spindle) (M901)
cabinet (lower) sub ASSY
2
chassis
6
3-4. Motor Assy (Sled) (M902), Optical Pick-up (DAX-25E)
p
1
screw (B 1.7x5)
3
cover, gear
gear B
9
screw assy, feed
5
8
2
4
motor assy (sled) (M902)
6
screw
(P 1.4x3.5)
7
bracket (Shaft)
qa
optical pick-u
(DAX-25E)
0
D-CS901
chassis
3-5. MAIN (SWITCH UNIT) Board, Hold Lever
3
MAIN (SWITCH UNIT) board
When installing, align S904 with the cut-out of the HOLD LEVER.
5
hold lever
2
lid, cover
1
six screws (B1.7 × 3)
4
screw (B) (1.4
lid, upper
×
4)
When replacing the hold knob, coat here with the specified grease (SGL-601) .
cabinet (lower) sub assy
7
O ring
6
hold knob
7
D-CS901
SECTION 4

TEST MODE

The following confirmation can be performed when the Test Mode is set.
4-1. How to set the Test Mode. To set the Test Mode, the following method is available.
1) Confirm the set is not powered on.
2) Confirm the following settings. CD DOOR OPEN switch (S801) ... OFF Solder Tap (TAP2 ) ... OPEN HOLD switch (S804) ... OFF G-PROTECTION switch (S802) ... 1
3) Short the solder tap TAP1 (TEST) on the MAIN board.
4) Turn on the main power.
4-2. How to cancel the Test Mode
1) Turn off the power.
2) Open the solder tap TAP1 (TEST) on the MAIN board.
Note: The solder should be removed clean.
• Refer to Page 10 – MAIN BOARD (side A) –
4-3. Operation when the Test Mode is set. When the Test Mode becomes active, following messages are displayed on the LCD.
DISPLAY
Test Mode
CS 032
version display
• FOLDER + / FOLDER – button Motion of the optical pick-up (to outside or inside)
• DISPLAY button Error rate signal out By each pressing the DISPLAY button error rate or spindle speed is displayed.
DISPLAY
Err
001 00 01
. button EF adjustment CLV automatic mode Tracking/Sled servo off
DISPLAY
EF
All lit (Test Mode)
4-4. Operations by buttons in the Test Mode. The following confirmations can be performed by operating buttons.
[Operation when a CD is not placed in the CD player]
• FOLDER + / FOLDER – button Motion of the optical pick-up (to outside or inside) Note : Be sure to keep your eyes apart from the direct emission of
the Laser diode. Do not move the optical pick-up over outermost or innermost.
[Operation when a CD is placed in the CD player]
Procedure:
1) Confirm the set is not powered on.
2) Keep short the solder tap TAP1 (TEST) on the MAIN board.
3) After turning on the power, set a CD in the player. Then press the >B button. Tracking/Sled servo off Focus search Spindle servo on
DISPLAY
00 00
• SOUND button Automatic gain adjustment
DISPLAY
AUTO GA
00 00
• REPEAT/ENTER button Tracking gain up mode Tracking gain normal mode (Brake off)
DISPLAY
GA UP
GA NORM
x button All servos (Focus/Tracking/Sled) off CLV brake Mute on
8
00 00
(To cancel this mode, turn off the power. Then set in the Test Mode again.)
D-CS901
• PLAY MODE button Display spindle speed Every pressing the button changes spindle speed 1 to speed 4 . Tracking/Sled servo on Mute off
DISPLAY Spindle Speed
001 00 01
002 00 02
003 00 03
(1.5x)
(2x)
(3x)
5) C1 error rate display mode is active by pressing the DISPLAY button.
The LCD displays the following message.
DISPLAY
Value of
Err
00 00 ~ 0099 : OK 01 00 ~ : NG
Note: Press the SOUND button before pressing the PLA Y MODE
button during playing a CD. By pressing in a wrong order, the value of Er ** ** becomes very big.
6) When the error rate or spindle speed is displayed, the PLAY MODE button is effective and the spindle speed is changeable.
7) Press the x button to stop.
8) Turn off the power.
9) Open txhe solder tap TAP1 (TEST) on the MAIN board.
Note: The solder should be removed clean.
4-6. Test mode for switch unit (PI LCD TEST) To set this test mode, short the solder taps TAP1(TEST) and TAP3(TEST) on the MAIN board.
• Refer to Page 10 – MAIN BOARD (side A) (side B) – and Figure
004 00 04
(To cancel this mode, turn off the power. Then set in the T est Mode again.)
4-5. Error rate display C1 error rate is displayed when the following operation are performed during playing in the Test Mode.
1) Cancel the other Test Mode by turnig off the power.
2) After turnig on the power, set a CD in the player. Then press the >B button.
DISPLAY
(3.5x)
00 00
3) Set the automatic gain adjustment by pressing the SOUND
button.
4) Press the PLAY MODE button.
DISPLAY
001 00 01
(Spindle Speed)
9
D-CS901
–MAIN BOARD (SIDE A) –
IC403
Button Pressed Display
TAP1
(TEST)
CN901
TAP3
(TEST)
–MAIN BOARD (SIDE B) –
IC804
IC801
IC803
IC701
IC402
IC404
IC301
IC401
See "Figure 01"
IC703
IC602
IC601
IC405
See "Figure 02"
FOLDER
FOLDER
PLAY MODE
REPEAT/ENTER
SOUND
DISPLAY
(Press again for odd dots)
{
(Press again for even dots)
|
See "Figure 03"
See "Figure 04"
See "Figure 05"
See "Figure 06"
See "Figure 07"
See "Figure 08"
See "Figure 09"
HOLD
SOUND
through all the icons and dots and end with full display.
See "Figure 10"
If HOLD is ON, pressing SOUND key will scroll
Figure 01 Figure 02 Figure 03 Figure 04
Figure 05 Figure 06 Figure 07
Figure 08 Figure 09 Figure 10 (End up like this.)
10
SECTION 5
p

ELECTRICAL ADJUSTMENTS

D-CS901
The CD section adjustments are done automatically in this set. In case of operation check, confirm that RF level.
Precautions for Check
1. Perform check in the order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise indicated.
3. Power supply voltage requirement : DC4.5 V in DC IN jack.
(J401) VOLUME control : Minimum HOLD switch : OFF G-PROTECTION switch : 1
RF Level Check
Condition:
• Hold the set in horizontal state.
Connection:
oscilloscope
(AC range)
MAIN board
TP603 (RF) GND
2 k
+ –
Procedure:
1. Connect the oscilloscope to the test points TP603 (RF) and GND on the MAIN board.
2. Set a disc. (YEDS-18)
3. Press the > B button.
4. Check the oscilloscope waveform is as shown below. A good eye pattern means that the diamond shape (◊) in the center of the waveform can be clearly distinguished.
Checking Location:
–MAIN BOARD (SIDE B) –
IC801
IC803
IC402
IC404
IC301
IC401
IC701
IC804
IC703
IC602
IC601
IC405
GND
TP603
(RF)
RF Signal reference Waveform (Eye Pattern)
VOLT/DIV : 100 mV (With the 10:1 probe in use) TIME/DIV : 500 ns
RF level
0.4 to 0.65 Vp-
To watch the eye pattern, set the oscilloscope to AC range and increase the vertical sensitivity of the oscilloscope for easy watch­ing.
5. Stop revolving of the disc motor by pressing the x button.
11
D-CS901
SECTION 6

DIAGRAMS

Note For Printed Wiring Boards And Schematic Diagrams
Note on Printed Wiring Board
X : parts extracted from the component side.
Y : parts extracted from the conductor side.
: Pattern from the side which enables seeing. (The other layers' patterns are not indicated.)
Caution: Pattern face side: Parts on the pattern f ace side seen from (Side A) the pattern face are indicated. Parts face side: Parts on the parts face side seen from (Side B) the parts face are indicated.
• Indication of transistor
C Q
B
E
These are omitted.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.
• All resistors are in and 1/
•%: indicates tolerance.
C : panel designation.
f
Note:
The components identi­fied by mark 0 or dotted line with mark 0 are criti- cal for safety. Replace only with part number specified.
A : B+ Line.
•Total current is measured with CD installed.
•Power voltage is dc 4.5 V and fed with regulated dc power supply from DC IN jack (J401).
•Voltages and waveforms are dc with respect to ground in playbac k mode. no mark : CD PLAY
•Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production toler­ances.
•Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production toler­ances.
• Circled numbers refer to waveforms.
• Signal path.
J : CD c : CD-R/RW (MP3)
•Abbreviation CND : Canadian model. AUS: Australian model.
4
: internal component.
Note:
Les composants identifiés par une marque 0 sont critiques pour la sécurité. Ne les remplacer que par une piéce portant le numéro spécifié.
W or less unless otherwise specified.
• Waveforms
(CD play mode)
1 TP603 (RF)
200 mV/DIV, 400 ns/DIV
2
IC601 <z/n>>(LRCK_O)
22.7 µs
500 mV/DIV, 5
540 mVp-p
2.7 Vp-p
µ
s/DIV
3
IC601 rk>(XTAO)
59 ns
500 mV/DIV, 40 ns/DIV
4
IC801 q; (XTALO)
125 ns
1 V/DIV, 40 ns/DIV
2.1 Vp-p
3.2 Vp-p
12
6-1. Block Diagrams
– MAIN Section 1 –
DETECTOR
A
B
RF
E
F
VCC
OPTICAL PICK-UP
BLOCK
DAX-25E
FOCUS
COIL
TRACKING
COIL
LD
PD
M902 SLED
MOTOR
M901
SPINDLE
MOTOR
• R-ch is omitted due to
same as L-ch.
• Signal path
:CD
:CD-R/RW(MP3)
A
B
RF
E
F
F+
F–
T+
T–
LD
PD
S+
M
S–
C+
M
C–
OPGSW
OPSTB
VCC1 +2V
D-CS901
IC601
RF AMP,
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO PROCESSOR,
D-RAM CONTROLLER
A
92
B
91
RFDC
88
RFAC
84
E
89
A
SYNC
MSDTO
MSCK
35 26
34
100
95
F
90
SFDR
100
SRDR
99
FFDR
96
FRDR
95
TFDR
98
TRDR
97
C176
104
MDP
103
MDS
102
CLVOUTPUT_O CLVFB_I
LASERAGCDAC_O
OPGSW_O OPSTB_O
CLK_I
SDT_I
2320
21
5542 16
41
DSP_SCK_O
DSP_SDTO_O
IC401 (1/2)
FOCUS/TRACKING COIL DRIVER,
SPINDLE/SLED MOTOR DRIVER
FO1
38
DRIVER
RO1
36
FO4
26
DRIVER
RO4
24
LGO4
69
INM4
6
RF41
2
PAPC
3
FO2
34
RO2
32
FO3
30
RO3
28
POWER
SUPPLY4
PD AMP
DRIVER
DRIVER
APC
LEVEL
SHIFTER
CONTROLLER
LD AMP
RI2
RI1
RI4
PWM3
FR3
VINDET
APCREF
FI2
FI1
FI4
17 18
40 41
21 22
19
20
4
7
IC405
COMPARATOR
4
B+ +3V
1
3
B
C
OPGSW OPSTB
WDCK
GFS
MDS
XTAO
XTAI
RFAC
XSOE SENS
XLAT CLOK SCOR SDTO
RFDC
SFDR
SRDR
FFDR FRDR TFDR
TRDR
XLAT_I
IC804
BUFFER
DSP_XLAT_O
MDP
E
F B A
3
5
SIGNAL
PROCESSOR
BLOCK
SENS_O
DSP_SENS_I
SCOR_O
27
1
7
DSP_SCOR_INT
SERVO BLOCK
XSOE_I
GRSCOR_O
2422
26
6
2
46
1740
DSP_XSOE_O
DSP_GRSCOR_INT
MEMORY
CONTROLLER,
BUS BOOST
BLOCK
GFS_O
69
351
87
DSP_GFS_I
3
FOK_O
65
86
SYSTEM CONTROL
IC803
BUFFER
7
DSP_FOK_I
IC801 (1/2)
MUTE_I30XQOK31XWRE
25
51
RV801
VOL
AOUT1
LPF
A0-A10
7
82
89
AMUTE_O
DSP_XQOK_O
DVDD(2V)
D0-D3
DSP_XWRE_O
51
AOUT2
MUTE_O
XRAS
XWE
XCAS
PCMD_I
PCMD_O
LRCK_I
LRCK_O
BCK_I
BCK_O
XRDE_I
XTAO
XTAI
XRST_I
28
53 96
DSP_XRST_O
56
61
4, 3,
6, 5
116-113,
17-15, 13-11,
117
1
2 9
107
111
18
48
47
R-CH
X601
16.9MHz
32
VOLMNT_AD
2, 3,
24, 25
9-12,
15-19,
21,8
5 4
23
IC703
BUFFER
17
35
62
92
14
19
D0-D3
XRAS XWE XCAS
12108
14106
13110
60
62
DSP_XRDE_O
HEADPHONE AMP
LIN
MUTE
MT SW
PW SW
IC602
D-RAM
A0-A10
SDO
9109
SDI0
LRCKIA
BCKIA
CKO
XI
/RESET
MP3_RST_O
IC301
BEEP
PWRSW
IC701
MP3 DECODER
I2CDATA_I
I2CCLK_I
STANDBY
19
4554761 98
MP3STANDBY_O
MP3_SCLO(I2C)_O
MP3_SDAO(I2C)_O
LOUT
R-CH
BEEP
PO7
391
Q701
MP3_REQ_I
49
44
PWRSW_O
R-CH
BEEP_O
8
17
20
J301
i
1313
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