Sony MDSM-9 Service manual
MDS-M9
SERVICE MANUAL
MDS-M9 is the Mini disc deck
section in DHC-MD7.
US and foreign patents licensed from Dolby Laboratories Licensing Corporation.
SPECIFICATIONS
Model Name Using Similar Mechanism MDS-302
MD Mechanism Type MDM-2B
Base Unit Type MBU-2
Optical Pick-up Type KMS-210A/J-N
US Model
Canadian Model
E Model
Tourist Model
MICROFILM
MiNi DiSC DECK
— 1 —
TABLE OF CONTENTS
1. SERVICE NOTE ........................................................... 4
MODEL IDENTIFICATION
— BACK PANEL —
2. GENERAL .................................................................... 6
3. TEST MODE
3-1. Setting the Test Mode .........................................................11
3-2. Exiting the Test Mode ........................................................11
3-3. Basic Operations of the Test Mode .................................... 11
3-4. Selecting the Test Mode ..................................................... 11
3-4-1. Operating the Continuous Playback Mode ..............11
3-4-2. Operating the Continuous Recording Mode ............12
3-4-3. Non-Volatile Memory Mode....................................12
3-5. Functions of Other buttons .................................................12
3-6. Test Mode Displays ............................................................13
3-7. Meanings of Other Displays............................................... 13
3-8. Precautions for Use of Test Mode ...................................... 13
4. ELECTRICAL ADJUSTMENTS
4-1. Precautions for Checking Laser Diode Emission............... 14
4-2. Precautions for Use of optical pickup (KMS-210A).......... 14
4-3. Precautions for Adjustments...............................................14
4-4. Creating MO Continuously Recorded Disc........................14
4-5. Temperature Compensation Offset Adjustment ................. 15
4-6. Laser Power Adjustment..................................................... 15
4-7. Trav erse Adjustment........................................................... 16
4-8. Focus Bias Adjustment....................................................... 17
4-9. Error Rate Check ................................................................17
4-9-1. CD Error Rate Check............................................... 17
4-9-2. MO Error Rate Check ..............................................17
4-10. Focus Bias Check ...............................................................17
4-11. Adjusting Points and Connecting Points ............................18
US,Canadian model
Other model
Parts No.
PARTS No.
4-977-679-3π
4-977-679-2π
5. DIAGRAMS
5-1. Circuit Boards Location ..................................................... 19
5-2. Block Diagrams ..................................................................20
5-3. Printed Wiring Board — RF Section —.............................26
5-4. Schematic Diagram — RF Section — ...............................29
5-5. Schematic Diagram — Digital Section — ......................... 33
5-6. Printed Wiring Board — Digital Section — ...................... 37
5-7. Printed Wiring Board — Power Section — .......................41
5-8. Schematic Diagram — Power Section — ..........................42
5-9. Schematic Diagram — Panel Section —............................45
5-10. Printed Wiring Board — Panel Section — ......................... 45
5-11. IC Block Diagrams — Digital Section —.......................... 48
5-12. IC Pin Functions
• IC101 RF Amplifier (CXA1981AR) ...............................49
• IC121 Digital signal processor, digital servo processor,
EFM/ACIRC encoder/decoder (CXD2535BR)...............50
• IC201 System Control (M37610MD-067FP) ................. 53
• IC271 Shock-Proof Memory Controller,
ATRAC Encoder/ Decoder (CXD2536R) .......................56
• IC301 A/D Converter (CXD8566M)............................... 58
• IC701 Display control, LED drive ..................................59
6. EXPLODED VIEWS
6-1. Front Panel Section ............................................................ 60
6-2. Chassis Section................................................................... 61
6-3. Mechanism Deck Section (MDM-2B) ............................... 62
6-4. Base Unit Section (MBU-2) ...............................................63
7. ELECTRICAL ADJUSTMENT................................. 64
— 2 —
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as a
CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
This caution label
is located inside
the unit.
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
damaged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop acr oss a resistor by means of a V OM
or battery-operated AC voltmeter . The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
Flexible Circuit Board Repairing
• Keep the temperature of 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.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DO TTED 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.
0.15µF
1.5k
Ω
Earth Ground
AC
voltmeter
(0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR 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
SERVICE NOTE
Power Supply During Servicing
This unit is not able to operate on its own because it does not have its own power supply. During servicing, connect to other units.
Power is supplied when the SYSTEM POWER button of the amplifier (TA-M7) is turned ON.
If the other units are not available, use a service box (PFJ-1) and jig (J-2501-078-A).
In this case, press the p button, r REC button, and DISPLAY button simultaneously to turn on the power.
[Connection Diagram]
SERVICE BOX (PFJ-1)
JIG
(J-2501-078-A)
POWER SW
Unit (MDS-M9)
FH-E939, 838, 937
CDP/TC
CN904
17P
Connector cable 17P
(Provided with PFJ-1)
CN902
7P
Connector cable 7P
(Provided with unit)
CN101
SYSTEM CONTROL
KEY/Fluorescent Indicator Tube/LED Check Mode
Press the p button, r REC button, and SHUFFLE button simultaneously to turn on the key/Fluorescent indicator tube/LED check mode.
During the check mode, press any button or rotate the SELECTOR knob to proceed onto the next step.
1 LED all-lit mode (displays KEY/FL/LED.)
N
2 Fluorescent indicator tube all lit mode
NNN
3 CHECK 1 lit mode (partially lit)
4 CHECK 2 lit mode (Partially lit)
5 Key check mode (Displays JOG = 0, KEY = 0)
Note 1) When the three buttons pressed to enter the LED all lit mode are released together, the LED all lit mode will r emain on. When released
separately, the next Fluorescent indicator tube all lit mode will be set.
Note 2) The LEDs will light up sequentially after the all lit mode each time the buttons are pressed or the SELECTOR knob is rotated.
Note 3) In the key check mode, each time the button is pressed, the “KEY =” number on the Fluorescent indicator tube increases. When
the SELECTOR knob is rotated, the “JOG =” number on the Fluorescent indicator tube increases in the + direction and decreases
in the = direction.
Note 4) To end the above mode, remove the amplifier AC plug or turn OFF the PFJ-1 POWER switch.
Input Switching by Multiple Pressing
The desired input switching can be performed by the following multiple pressing.
p button, r REC button, and REPEAT button : Digital-in
p button, r REC button, and CONTINUE button : Analog-in
— 4 —
Forced Reset Switch
The switch on the power board (S101) is the forced reset switch for
IC201.
Press it for about one second after turning on the power after
disassembling and assembling the unit again.
• Parts Location
[POWER BOARD] — Component side —
CN104
CN102
S101
Note for replacement of IC121 and IC171 on the BD board
IC121 on the BD board of this unit has modified from CXD2535AR to CXD2535BR due to an improvement.
Some contents of nonvolatile memory in the IC171 are modif ied according to this modification. When replacing IC171, the previous contents
for IC121 (CXD2535AR) are written as an initialized value from the system control IC. (When replacing IC171, turn the power on once to
write an initialized value.)
In case the IC171 on the BD board is replaced, which uses CXD2535BR to IC121, see the following procedure to rewrite the contents of
nonvolatile memory. As for replacement of IC121, use CXD2535BR to rewrite the contents of IC171.
Table Comparison between CXD2535AR and CXD2535BR
regarding the contents of nonvolatile memory
ADDRESS
15
2D
2E
CXD2535AR
90
33
33
CXD2535BR
93
1A
1A
How to rewrite the nonvolatile memory
1 Press the p button, EDIT/NO button and REPEAT button at the same time when the POWER of set is turned OFF (Be sure to release
the three buttons at the same time.)
2 Turn the SELECTOR knob to be displayed “EEP MODE”.
If the ENTER/YES button is pressed, the display will be changed to “EEP ∗∗ @@”.
(∗∗ : Address, @@ : data)
3 Turn the SELECTOR knob to be displayed “EEP 15 @@”.
4 If the SELECTOR knob is pressed, “EEP 15 @@ > @@” will be displayed. So turn the SELECTOR knob to be displayed “EEP 15 @@
> 93”.
5 Pressing the ENTER/YES button, “Complete!” is displayed once, “EEP 15 93” is displayed, and the data is rewritten.
6 As for the address 2D and 2E, rewrite each of them to “1A” following the steps 3 to 5 as well.
7 After the all modification are complete, press the EDIT/NO button to be displayed “EEP MODE”.
8 Press the REPEAT button. In case a disc is unloaded, the display “STANDBY” will be go on and off, then unplug the power plug. In case
a disc is loaded, “STANDBY” is displayed once and the disc is ejected. After that, unplug the power plug from an outlet to be out from the
EEP rewriting mode.
Note : The modification in the contents of nonvolatile memory is not reflected if the power is not turned off once.
— 5 —
SECTION 2
GENERAL
This section is extracted from
instruction manual.
— 6 —
— 7 —
— 8 —
— 9 —
— 10 —
SECTION 3
TEST MODE
3-1. Setting the Test Mode
Press the STOP (p) button, EDIT/NO (NO) button and REPEAT button at the same time when the POWER of set is turned OFF. (Be sure to
release the Three buttons at the same time.)
3-2. Exiting the Test Mode
1. Press the REPEAT button.
2. In case a disc is unloaded, the display “STANDBY” will go on and off.
In case a disc is loaded, the “STANDBY” is displayed once and the disc is ejected.
3. Unplug the power plug from an outlet.
3-3. Basic Operations of the Test Mode
All operations are performed using the SELECTOR knob, ENTER/YES (YES) button, and EDIT/NO (NO) button.
The functions of these buttons are as follows.
Function
SELECTOR knob
YES button
NO button
Changes parameters and modes
Proceeds onto the next step. Finalizes input.
Returns to previous step. Stops operations.
Contents
3-4. Selecting the Test Mode
Eight test modes are selected by turning the SELECTOR knob.
Display
TEMP ADJUST
LDPWR ADJUST
EFBAL ADJUST
FBIAS ADJUST
FBIAS CHECK
CPLAY MODE
CREC MODE
EEP MODE
Temperature compensation offset adjustment
Laser power adjustment
Traverse adjustment
Focus bias adjustment
Focus bias check
Continuous playback mode
Continuous recording mode
Non-volatile memory mode ∗
For detailed description of each adjustment mode, refer to 4. Electrical Adjustments.
If a different adjustment mode has been selected by mistake, press the NO button to exit from it.
∗ The EEP MODE is not used in servicing. If set accidentally, press the NO button immediately to exit it.
3-4-1. Operating the Continuous Playback Mode
1. Entering the continuous playback mode
1 Set the disc in the unit (either MO or CD).
2 Rotate the SELECTOR knob and display “CPLAY MODE”.
3 Press the YES button to change the display to “CPLAY IN”.
4 When access completes, the display changes to “C1 = AD = ”.
Note : The “ ” displayed are arbitrary numbers.
2. Changing the parts to be played back
1 Press the YES button during continuous playback to change the display to “CPLAY MID”, “CPLAY OUT”.
When pressed another time, the parts to be played back can be changed.
2 When access completes, the display changes to “C1 = AD = ”.
Note : The “ ” displayed are arbitrary numbers.
3. Ending the continuous playback mode
1 Press the NO button. The display will change to “CPLAY MODE”.
2 Press the EJECT button and remove the disc.
Note 1 : The playback start addresses for IN, MID, and OUT are as follows.
IN 40h cluster
MID 300h cluster
OUT 700h cluster
Contents
— 11 —
3-4-2. Operating the Continuous Recording Mode
1. Entering the continuous recording mode
1 Set the MO disc in the unit.
2 Rotate the SELECTOR knob and display “CREC MODE”.
3 Press the YES button to change the display to “CREC IN”.
4 When access completes, the display changes to “CREC ( )” and REC lights up.
Note : The “ ” displayed are arbitrary numbers.
2. Changing the parts to be recorded
1 When the YES button is pressed during continuous recording, the display changes to “CREC MID”, “CREC OUT” and REC goes off.
When pressed another time, the parts to be recorded can be changed.
2 When access completes, the display changes to “CREC ( )” and REC lights up.
Note : The “ ” displayed are arbitrary numbers.
3. Ending the continuous recording mode
1 Press the NO button. The display changes to “CREC MODE” and REC goes off.
2 Press the EJECT button and remove the disc.
Note 1 : The recording start addresses for IN, MID, and OUT are as follows.
IN 40h cluster
MID 300h cluster
OUT 700h cluster
Note 2 :The NO button can be used to stop recording anytime.
Note 3 :During the test mode, the erasing-protection tab will not be detected. Therefore be careful not to set the continuous recording mode
when a disc not to be erased is set in the unit.
Note 4 :Do not perform continuous recording for long periods of time above 5 minutes.
Note 5 :During continuous recording, be careful not to apply vibration.
3-4-3. Non-Volatile Memory Mode
This mode reads and writes the contents of the non-volatile memory.
It is not used in servicing. If set accidentally, press the NO button immediately to exit it.
3-5. Functions of Other buttons
Function
¢
P
p
)
0
r REC
SCROLL
PROGRAM
DISPLAY
Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo turns ON/OFF.
Stops continuous playback and continuous recording.
The sled moves to the outer circumference only when this is pressed.
The sled moves to the inner circumference only when this is pressed.
Turns recording ON/OFF when pressed during continuous playback.
Switches between the pit and groove modes when pressed.
Switches the spindle servo mode (CLVS and A).
Switches the display when pressed.Returns to previous step. Stops operations.
Note : The erasing-protection tab is not detected during the test mode. Recording will start regardless of the position of the erasing-protection
tab when the r REC button is pressed.
Contents
— 12 —
3-6. Test Mode Displays
Each time the DISPLAY button is pressed, the display changes in the following order.
MODE displaynError rate displaynAddress display
1. MODE display
Displays “TEMP ADJUST”, “CPLAY MODE”, etc.
2. Error rate display
Error rates are displayed as follows.
C1 = AD =
C1 = : Indicates C1 error
AD= : Indicates ADER
3. Address display
Addresses are displayed as follows.
h = s = (MO pit and CD)
h = a = (MO groove)
h = : Header address
s = : SUBQ address
a = : ADIP address
∗ is displayed when the address cannot be read.
3-7. Meanings of Other Displays
Display
¢
P
REC
CD SYNC
TRACK
DISC
LEVEL SYNC
STEP
SHUFFLE
Light
During continuous playback
Tracking servo OFF
Recording mode ON
CLV LOCK
Pit
High reflection
CLV-S
ABCD adjustment completed
Focus auto gain successful
Tracking auto gain successful
STOP
Tracking servo ON
Recording mode OFF
CLV UNLOCK
Groove
Low reflection
CLV-A
Contents
Off
Focus auto gain successful
Tracking auto gain failed
Blinking
3-8. Precautions for Use of Test Mode
1 As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is
stopped before setting and removing it.
Even if the EJECT button is pressed while the disc is rotating during continuous playback, continuous recording, etc., the disc will not stop
rotating.
Therefore, it will be ejected while rotating.
Always press the NO button first before pressing the EJECT button.
2 The erasing-protection tab is not detected in the test mode. Therefore , when modes which output the recording laser po wer such as continu-
ous recording mode and traverse adjustment mode, etc. are set, the recorded contents will be erased regardless of the position of the tab.
When using a disc that is not to be erased in the test mode, be careful not to enter the continuous recording mode and traverse adjustment
mode.
— 13 —
SECTION 4
ELECTRICAL ADJUSTMENTS
4-1. Precautions for Checking Laser Diode
Emission
To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.
4-2. Precautions for Use of optical pick-up
(KMS-210A)
As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first. Before connecting the connector, be careful not to remove the solder. Also take
adequate measures to prevent damage by static electricity. Handle
the flexible board with care as it breaks easily.
laser tap
Optical pick-up flexible board
4-3. Precautions for Adjustments
1) When replacing the following parts, perform the adjustments and
checks with ® in the order shown in the following table.
Optical
Pick-up
1. Temperature
compensation
offset adjustment
2. Laser power
adjustment
3. Traverse
adjustment
4. Focus bias
adjustment
5. Error rate check
IC171
G
®
®
®
®
®
G
®
®
®
2) Set the test mode when performing adjustments.
After completing the adjustments, exit the test mode.
3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.
• MD test disc (CD) TDYS-1 (Parts No. 4-963-646-01)
• Laser power meter LPM-8001 (Parts No. J-2501-046-A)
• Oscilloscope
• Digital voltmeter
• Thermometer
5) When observing several signals on the oscilloscope, etc.,
make sure that VC and Ground do not connect inside the
oscilloscope.
(VC and Ground will become short-circuited.)
BD Board
IC101, IC121, IC191
D101
®
G
G
G
G
®
®
®
®
®
4-4. Creating MO Continuously Recorded Disc
* This disc is used in focus bias adjustment and error rate check. The
following describes how to create a MO continuous recording disc.
1. Insert a MO disc (blank disc) commercially available.
2. Rotate the SELECTOR knob and display “CREC MODE”.
3. Press the YES button and display “CREC IN”.
4. Press the YES button again to display “CREC MID”.
“CREC (0300)” is displayed for a moment and recording starts.
5. Complete recording within 5 minutes.
6. Press the NO button and stop recording .
7. Press the EJECT button and remove the MO disc.
The above has been how to create a continuous recording data
for the focus bias adjustment and error rate check.
Note :
• Be careful not to apply vibration during continuous recording.
— 14 —
4-5. Temperature Compensation Offset Adjustment
Save the temperature data at that time in the non-volatile memory as
25 ˚C reference data.
Note :
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to
28 ˚C. Perform it immediately after the power is turned on when
the internal temperature of the unit is the same as the ambient
temperature.
3. When D101 has been replaced, perform this adjustment after the
temperature of this part has become the ambient temperature.
Adjusting Method :
1. Rotate the SELECTOR knob and display “TEMP ADJUST”.
2. Press the YES button and select the “TEMP ADJUST” mode.
3. “TEMP =
4. To save the data, press the YES button.
When not saving the data, press the NO button.
5. When the YES button is pressed, “TEMP = SAVE” will be
displayed for some time, followed by “TEMP ADJUST”.
When the NO button is pressed, “TEMP ADJUST” will be displayed.
Specifications :
The “TEMP = ” should be within “E0 - EF”, “F0 - FF”, “00 - 0F”,
“10 - 1F” and “20 - 2F”.
” and the current temperature data will be displayed.
4-6. Laser Power Adjustment
Connection :
Laser power
meter
Optical pick-up
objective lens
Digital voltmeter
BD board
TP (I + 5V)
TP (IOP)
Adjusting Method :
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the 0 button or
) button and move the optical pickup.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).
2. Rotate the SELECTOR knob and display “LDPWR ADJUST”.
(Laser power : For adjustment)
3. Press the YES button twice and display “LD $ 4B = 3.5 mW”.
4. Adjust RV102 of the BD board so that the reading of the laser
power meter becomes 3.4 mW.
5. Press the YES button and display “LD $ 96 = 7.0 mW”.
(Laser power : MO writing)
6. Check that the laser power meter and digital voltmeter readings
satisfy the specified value.
+0.1
–0
Specification :
Laser power meter reading: 7.0 ± 0.3 mW
Digital voltmeter reading : Optical pick-up displayed value
± 10%
(Optical pick-up label)
KMS
210A
27X40
B0825
N
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (Ω)
7. Press the YES button and display “LD $ 0F = 0.7 mW”.
(Laser power : MO reading)
8. Check that the laser power meter at this time satisfies the specified value.
Specification :
Laser power meter reading : 0.70 ± 0.1 mW
9. Press the NO button and display “LDPWR ADJUST’, and stop
laser emission.
(The NO button is effecti ve at all times to stop the laser emission.)
— 15 —
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