DOWNLOAD Sony MDS-JE470 Service Manual ↓ Size: 3.85 MB | Pages: 70 in PDF or view online for FREE

Model
MDS-JE470
Pages
70
Size
3.85 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mds-je470.pdf
Date

Sony MDS-JE470 Service Manual ▷ View online

4
MDS-JE470
Description
Table of Error Codes
Error Code
10
12
20
21
22
23
24
30
31
40
41
42
43
50
51
Could not load
Loading switches combined incorrectly
Timed out without reading the top of PTOC
Could read top of PTOC, but detected error
Timed out without accessing UTOC
Timed out without reading UTOC
Error in UTOC
Could not start playback
Error in sector
Retry cause generated during normal recording
Retried in DRAM overflow
Retry occurred during TOC writing
Retry aborted during S.F editing
Other than access processing, and could not read address.
Focus NG occurred and overran.
MODEL IDENTIFICATION
— BACK PANEL —
Part No.
• Abbreviation
CND : Canadian model
SP
: Singapore model
HK
: Hong Kong model
AUS
: Australian model
MODEL
AEP, UK models
US model
CND model
SP models
HK model
AUS model
PARTS No.
4-233-025-0s
4-233-025-1s
4-233-025-2s
4-233-025-3s
4-233-025-4s
4-233-025-5s
Display
History
spdl change
Mode for erasing the total spdl rp tm time
These histories are based on the time of replacement of the spindle motor. If the spindle motor has been replaced,
perform this procedure and erase the history.
Procedure
1. Press the  lAMSL  knob when displayed as “spdl change”
2. Press the  YES  button when the display changes to “spdl change?”
When “Complete!” is displayed, it means erasure has completed.
TABLE OF CONTENTS
1. SERVICING NOTES 
........................................................ 5
2. GENERAL
........................................................................ 12
3. DISASSEMBLY
3-1.   Disassembly flow .............................................................. 13
3-2.   Upper Case (408226) ........................................................ 14
3-3.   Front Panel Section ........................................................... 14
3-4.   Main Board ....................................................................... 15
3-5.   PT Board, VOL-SEL Board (SP model) ........................... 15
3-6.   Mechanism Deck Section ( MDM-7A) ............................. 16
3-7.   Over Light Head (HR901), BD Board .............................. 16
3-8.   Holder Assy ....................................................................... 17
3-9.   Loading Motor Assy (M103) ............................................ 17
3-10. Sled Motor Assy (M102), Slider ....................................... 18
3-11. Optical Pick-up .................................................................. 18
3-12. Spindle Moter Assy (M101) .............................................. 19
4. TEST  MODE
  ......................................................................20
5. ELECTRICAL ADJUSTMENTS
............................... 25
6. DIAGRAMS
6-1. Circuit Boards Location ...................................................... 36
6-2. Block Diagrams
• BD Section ....................................................................... 38
• Main Section .................................................................... 39
6-3. Printed Wiring Board – BD Board – ................................... 40
6-4. Schematic Diagram – BD Section (1/2) – ........................... 41
6-5. Schematic Diagram – BD Section (2/2) – ........................... 42
6-6. Schematic Diagram – Main Section (1/2) – ........................ 43
6-7. Schematic Diagram – Main Section (2/2) – ........................ 44
6-8. Printed Wiring Board – Main Section  – ............................. 45
6-9. Printed Wiring Board – Display Section – .......................... 46
6-10.  Schematic Diagram – Display Section – .......................... 47
6-11.  Printed Wiring Board – Power Section – ......................... 48
6-12. Schematic Diagram – Power Section – ............................ 49
6-13.  IC Block Diagrams ........................................................... 50
6-14. IC Pin Functions ............................................................... 52
7. EXPLODED VIEWS
7-1. Chassis Section ................................................................... 59
7-2. Front Panel Section ............................................................. 60
7-3. Mechanism Section-1 (MDM-7A) ...................................... 61
7-4. Mechanism Section-2 (MDM-7A) ...................................... 62
8. ELECTRICAL PARTS LIST
........................................ 63
5
MDS-JE470
SECTION 1
SERVICE NOTES
This appliance is classified as a
CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT
MARKING is located on the
rear exterior.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radia-
tion 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.
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.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down 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
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
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 PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES 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.
This caution
label is located
inside the unit.
SAFETY  CHECK-OUT
(US model only)
    After correcting the original service problem, perform the fol-
lowing 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). Leak-
age 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 across a resistor by means of a VOM
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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15
µF
To Exposed Metal
Parts on Set
1.5k
AC
voltmeter
(0.75V)
Earth Ground
6
MDS-JE470
JIG FOR CHECKING BD BOARD WAVEFORM
The special jig (J-2501-196-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.
GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP : For measuring IOP (Check the deterioration of the optical pick-up laser)
TE
: TRK error signal (Traverse adjustment)
VC
: Reference level for checking the signal
RF
: RF signal (Check jitter)
FE
: Focus error signal
I+3V
Iop
GND
TE
FE
VC
RF
I+3V
IOP
GND
TE
FE
VC
RF
1
7
for
MDM-7A
I+3V
CN105
IOP
TE
VC
GND
FE
RF
7
MDS-JE470
Iop DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC195 OF
BD BOARD) ARE REPLACED
The Iop value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to
look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC195 of BD board), record
the Iop value on the optical pick-up according to the following procedure.
Record Precedure:
1. While pressing the  l AMS L  knob and  x  button, connect the power plug to the outlet, and release the  l AMS L  knob and
x  button.
2. Rotate the  l AMS L  knob to display “[Service]”, and press the  YES  button.
3. Rotate the  l AMS L  knob to display “Iop Write” (C05), and press the  YES  button.
4. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
5. Input the Iop value written on the optical pick-up.
To select the number : Rotate the  l AMS L  knob.
To select the digit
: Press the  l AMS L  knob.
6. When the  YES  button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).
7. As the adjustment results are recorded for the 6 value. Leave it as it is and press the  YES  button.
8. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop
Write”.
9. Press the  REPEAT  button to complete.
Display Precedure:
1. While pressing the  l AMS L  knob and  x  button, connect the power plug to the outlet, and release the  l AMS L  knob and
x  button.
2. Rotate the  l AMS L  knob to display “[Service]”, and press the  YES  button.
3. Rotate the  l AMS L  knob to display “Iop Read” (C26).
4. “@@.@/##.#” is displayed and the recorded contents are displayed.
@@.@ : indicates the Iop value labeled on the optical pick-up.
##.#
: indicates the Iop value after adjustment
5. To end, press the  l AMS L  button or  MENU/NO  button to display “Iop Read”. Then press the  REPEAT  button.
Page of 70
Display

Sony MDS-JE470 Service Manual ▷ Download

  • DOWNLOAD Sony MDS-JE470 Service Manual ↓ Size: 3.85 MB | Pages: 70 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony MDS-JE470 in PDF for free, which will help you to disassemble, recover, fix and repair Sony MDS-JE470 Audio. Information contained in Sony MDS-JE470 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.