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Model
MDS-JE480
Pages
68
Size
2.82 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mds-je480.pdf
Date

Sony MDS-JE480 Service Manual ▷ View online

8
MDS-JE480
OPTICAL PICK-UP BLOCK TYPE DISCRIMINATION
There are two types of the optical pick-up block in this model.
These are compatible except  for the laser power.
Check the type of the optical pick-up block before replacement.
Ajdust  following items after replacing the optical pick-up block.
• 5-6-2. Laser Power Check (See page 28)
• 5-10. LASER POWER ADJUSTMENT (See page 31)
Differences
KMS-260B
       KMS-260E
Color of the adhesive agent at PDIC portion
Pink
White
Form of FPC retainer plate
Close the hole on SL base
Not close the hole on SL base
APC variable resistor
Small volume (2 type)
Big variable resistor (3 type) and chip resistor (Fig. A)
Small variable resistor (2 type) and chip resistor (Fig. B)
Fig. B type is for repair.
• Abbreviation
260B: KMS-260B model
260E: KMS-260E model
KSN-260B
KSN-260E
(Fig A)
(Fig B)
CHIP
3 type variable
resistor
2 type variable
resistor
CHIP
Hold on SL base
Hold on SL base
FPC retainer plate
FPC retainer plate
APC variable
resistor
Adhesive agent at 
PDIC portion
Adhesive agent at 
PDIC portion
9
MDS-JE480
CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.
• 5-6-2. Laser power check (see page 28)
• 5-6-3. Iop Compare (see page 28)
• 5-6-4. Auto Check (see page 29)
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
adjustments.
When performing adjustments, use the specified values for adjustments.
FORCED RESET
The system microprocessor can be reset in the following procedure.
Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Procedure :
Remove the short-pin attached to CN406, and then attach it again.
[MAIN BOARD] (Component Side)
CN406
10
MDS-JE480
Fig. 2 Reading the Test Mode Display
(During playback)
@@###**$$
Fluorescent display tube display
@@ : Parts No. (name of area named on TOC)
### : Cluster
**
: Sector
$$
: Track mode (Track information such as copyright infor-
mation of each part)
RETRY CAUSE DISPLAY MODE
• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the
“track mode” for obtaining track information will be set.
This is useful for locating the faulty part of the unit.
• The following will be displayed :
During recording and stop : Retry cause, number of retries, and number of retry errors.
During playback
: Information such as type of disc played, part played, copyright.
These are displayed in hexadecimal.
Procedure:
1. Insert the recordable disc.
2. Press  MENU/NO  button to display “Edit Menu” on the fluorescent display.
3. Turn  l AMS L  button to display “All Erase?” on the fluorescent display.
4. Press  YES  button to display “All Erase??” on the fluorescent display.
5. Press  YES  button, “Complete!” is displayed on the fluorescent display and it turns off immediately.
6. Procedure 1: Press the  x  button continuously for about 10 seconds.
Procedure 2: Press the  LEVEL/DISPLAY/CHAR  button while pressing the  x  button and  MENU/NO  button.
7. When the mode is set, “RTs 00c 00e 000” is displayed.
8. Press the  z REC  button to start recording. Then press the  X  button and start recording.
9. To check the “track mode”, press the  H  button to start play.
10.To exit the test mode, press the  @/1  button, and turn OFF the power. When “TOC” disappears, disconnect the power plug from the outlet.
If the test mode cannot be exited, refer to “Forced Reset” on page 9.
} Address (Physical address on disc)
Hexadecimal
Bit
Binary
Higher Bits
Lower Bits
8
4
2
1
8
4
2
1
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
When track jump (shock) is detected
When ADER was counted more than five times continu-
ously
When ADIP address is not continuous
When DIN unlock is detected
When not in focus
When ABCD signal level exceeds the specified range
When CLV is unlocked
When access operation is not performed normally
Hexa-
decimal
shock
ader5
Discontinuous address
DIN unlock
FCS incorrect
IVR rec error
CLV unlock
Access fault
Cause of Retry
Occurring conditions
01
02
04
08
10
20
40
80
Reading the Retry Cause Display
Fig. 1 Reading the Test Mode Display
(During recording and stop)
RTs@@c##e***
Fluorescent display tube display
@@ : Cause of retry
##
: Number of retries
*** : Number of retry errors
11
MDS-JE480
Hexadecimal
Bit
Binary
Higher Bits
Lower Bits
8
4
2
1
8
4
2
1
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
Hexa-
decimal
Details
01
02
04
08
10
20
40
80
Emphasis OFF
Monaural
This is 2-bit display. Normally 01.
01:Normal audio. Others:Invalid
Audio (Normal)
Original
Copyright
Write prohibited
When 0
When 1
Emphasis ON
Stereo
Invalid
Digital copy
No copyright
Write allowed
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example When 84 is displayed:
Higher bit : 8 = 1000 
t b7
Lower bit : 4 = 0100 
t b2
In this case, as b2 and b7 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis OFF”, “monaural”,
“original”, “copyright exists”, and “write allowed”.
Example When 07 is displayed:
Higher bit : 0 = 1000 
t All 0
Lower bit : 7 = 0111 
t b0+b1+b2
In this case, as b0, b1, and b2 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis ON”, “stereo”,
“original”, “copyright exists”, and “write prohibited”.
Hexadecimal 
t
 Binary Conversion Table
Hexadecimal
Binary
Hexadecimal
Binary
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Reading the Track Mode Display
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example
When 42 is displayed:
Higher bit : 4 = 0100 
t b6
Lower bit : 2 = 0010 
t b1
In this case, the retry cause is combined of “CLV unlock” and “ader5”.
When A2 is displayed:
Higher bit : A = 1010 
t b7+b5
Lower bit : 2 = 0010 
t b2
The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.
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