DOWNLOAD Sony MDS-JE770 Service Manual ↓ Size: 4.1 MB | Pages: 72 in PDF or view online for FREE

Model
MDS-JE770
Pages
72
Size
4.1 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mds-je770.pdf
Date

Sony MDS-JE770 Service Manual ▷ View online

3
MDS-JE770
ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS
Selecting the Test Mode
Display
op rec tm
op play tm
spdl rp tm
retry err
total err
err history
retry adrs
er refresh
tm change
op change
History
Displays the total recording time.
When the total recording time is more than 1 minute, displays the hour and minute
When less than 1 minute, displays “Under 1 min”
The display time is the time the laser is set to high power, which is about 1/4 of the actual recording time.
Displays the total playback time.
When the total playback time is more than 1 minute, displays the hour and minute
When less than 1 minute, displays “Under 1 min”
Displays the total rotating time of the spindle motor.
When the total rotating time is more than 1 minute, displays the hour and minute
When less than 1 minute, displays “Under 1 min”
Displays the total number of retry errors during recording and playback
Displays “r xx p yy”. xx is the number of errors during recording. yy is the number of errors during playback.
This is displayed in hexadecimal from 00 to FF.
Displays the total number of errors
Displays “total xx”. This is displayed in hexadecimal from 00 to FF.
Displays the past ten errors.
Displays “0x ErrCd@@”.
X is the history number. The younger the number, the more recent is the history (00 is the latest). @@ is the error
code.
Select the error history number using the  lAMSL  knob.
Displays the past five retry addresses.
Displays “xx ADRS yyyy”, xx is the history number, yyyy is the cluster with the retry error.
Select the error history number using the  lAMSL  knob.
Mode for erasing the error and retry address histories
Procedure
1. Press the  lAMSL  knob when displayed as “er refresh”.
2. Press the  YES  button when the display changes to “er refresh?”.
When “complete!” is displayed, it means erasure has completed.
Be sure to check the following after executing this mode.
*Data has been erased.
*Perform recording and playback, and check that the mechanism is normal.
Mode for erasing the total time of recording and playback
Procedure
1. Press the  
lAMSL
  knob when displayed as “tm refresh”.
2. Press the  YES  button when the display changes to “tm refresh?”.
When “complete!” is displayed, it means erasure has completed.
Mode for erasing the total time of op rec tm, op play tm.
These histories are based on the time of replacement of the optical pickup. If the optical pick-up has been replaced,
perform this procedure and erase the history.
Procedure
1. Press the  lAMSL
 
  knob when displayed as “op change”.
2. Press the YES button when the display changes to “op change?”.
When “Complete!” is displayed, it means erasure has completed.
1. While pressing the  lAMSL   knob and  x  button, connect the power plug to the outlet, and release the  lAMSL  knob and
x  button.
When the test mode is set, “[Check]” will be displayed.
2. Rotate the  lAMSL  knob and when “[Service]” is displayed, press the  YES  button.
3. Rotate the  lAMSL  knob and display “Err Display”.
4. Pressing the  YES  button sets the error history mode and displays “op rec tm”.
5. Select the contents to be displayed or executed using the  lAMSL  knob.
6. Pressing the  lAMSL   knob will display or execute the contents selected.
7. Pressing the  lAMSL   knob another time returns to step 4.
8. Pressing the  MENU/NO  button displays “Err Display” and exits the error history mode.
9. To exit the test mode, press the  REPEAT  button. The unit sets into the STANDBY state, the disc is ejected, and the test mode ends.
4
MDS-JE770
PARTS No.
4-233-025-6s
4-236-047-1s
4-233-025-8s
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
SP
: Singapore model
MODEL
AEP models
UK models
SP models
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 .................................................................. 60
7-2. Front Panel Section ............................................................ 61
7-3. Mechanism Section-1 (MDM-7A) .................................... 62
7-4. Mechanism Section-2 (MDM-7A) .................................... 63
8. ELECTRICAL PARTS LIST
  ........................................64
5
MDS-JE770
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.
This caution
label is located
inside the unit.
6
MDS-JE770
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
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  • Here you can View online or download the Service Manual for the Sony MDS-JE770 in PDF for free, which will help you to disassemble, recover, fix and repair Sony MDS-JE770 Audio. Information contained in Sony MDS-JE770 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.