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Model
MDS-M100
Pages
60
Size
3.52 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / S/M MDS-M100 99 US CAN AEP
File
mds-m100.pdf
Date

Sony MDS-M100 Service Manual ▷ View online

– 8 –
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”.
• 0.9 mW power
Specified value : 0.84 to 0.92 mW
• 7.0 mW power
Specified value : 6.8 to 7.2 mW
lop (at 7mW)
• Labeled on the optical pickup
Iop value ± 10mA
• Traverse waveform
Specified value : Below 10% offset
• Error rate check
Specified value : For points a, b, and c
C1 error : About 200
AD error : Above 00
• Error rate check
Specified value:
a.
When using test disc (MDW-74/AU-1)
C1 error : Below 80
AD error : Below 2
b.
When using check disc (TDYS-1)
C1 error : Below 50
• CPLAY error rate check
Specified value:
C1 error : Below 80
AD error : Below 2
• Unsatisfactory if displayed as T=@@ (##) [NG”
NG
(@@, ## are both arbitrary numbers)
Laser power check
(6-2 : See page 23)
Traverse check
(6-3 : See page 23)
Focus bias check
(6-4 : See page 24)
C PLAY check
(6-5 : See page 24)
Self-recording/playback
check
(6-6 : See page 24)
Temperature
compensation
offset check
(6-1 : See page 23)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the
overwrite head
If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around
D101 (BD board)
• Check the signals around IC101, IC121, CN102,
CN103 (BD board)
Measure if unsatisfactory:
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.
– 9 –
[     ]
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.
Precedure:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the 
[MENU/NO]
 button. When “Edit Menu” is displayed on the fluorescent indicator tube, turn the
AMS
 
+ knob to
display “All Erase?”.
3. Press the 
[YES]
 button. (Or press the  
AMS
 
+ knob)
4. When “All Erase??” is displayed on the fluorescent indicator tube, the music calendar number blinks.
5. Press the 
[YES]
 button to display “Complete!!”, and press the
p button immediately. Wait for about 15 seconds while pressing the
button. (The  
AMS
 
+ knob can be pressed instead of the 
[YES]
 button for the same results.)
6. When the “TOC” displayed on the fluorescent display tube goes off, release the
p button.
7. Press the  
[    REC]
 button to start recording. Then press the
P button and start recording.
8. To check the “track mode”, press the
· button to start play.
9. To exit the test mode, press the
1/
u
button, and turn OFF the power. When “TOC” disappears, disconnect the power plug from the
outlet.
r
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
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 copy-
right information of each part)
Reading the Retry Cause Display
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
Cause of Retry
01
02
04
08
10
20
40
80
Higher Bits
Lower Bits
Hexadecimal
Bit
Binary
shock
ader5
Discontinuous address
DIN unlock
FCS incorrect
IVR rec error
CLV unlock
Access fault
Occurring conditions
When track jump (shock) is detected
When ADER was counted more than five times
continuously
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
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 
n b6
Lower bit : 2 = 0010 
n b1
In this case, the retry cause is combined of “CLV unlock” and “ader5”.
When A2 is displayed:
Higher bit : A = 1010 
n b7+b5
Lower bit : 2 = 0010 
n b1
The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.
Address
– 10 –
Reading the Retry Cause Display
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
Higher Bits
Lower Bits
Hexadecimal
Bit
Binary
When 0
Emphasis OFF
Monaural
This is 2-bit display. Normally 01.
01:Normal audio. Others:Invalid
Audio (Normal)
Original
Copyright
Write prohibited
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 
n b7
Lower bit : 4 = 0100 
n 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 
n All 0
Lower bit : 7 = 0111 
n 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 
n
 Binary Conversion Table
Hexadecimal
Binary
Hexadecimal
Binary
0
0000
8
1000
1
0001
9
1001
2
0010
A
1010
3
0011
B
1011
4
0100
C
1100
5
0101
D
1101
6
0110
E
1110
7
0111
F
1111
– 11 –
SECTION  2
GENERAL
This section is extracted from
instruction manual.
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