Sony MDS-SP55 Service Manual ▷ View online
9
• 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)
lop (at 7mW)
• Labeled on the optical pick-up
Iop value ± 10mA
• Traverse waveform
Specified value : Below 10% offset
• Error rate check
Specified value : For points a, b, and c
C1 error : Below 220
AD error : Below 2
C1 error : Below 220
AD error : Below 2
• Error rate check
Specified value:
a. When using test disc (MDW-74/GA-1)
a. When using test disc (MDW-74/GA-1)
C1 error : Below 80
AD error : Below 2
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
C1 error : Below 80
AD error : Below 2
• Unsatisfactory if displayed as T=@@ (##) [NG]
NG
(@@, ## are both arbitrary numbers)
(@@, ## are both arbitrary numbers)
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”.
Details of the procedures are described in “5 Electrical Adjustments”.
Laser power check
(5-6-2 : See page 24)
(5-6-2 : See page 24)
Traverse check
(5-6-3 : See page 24)
Focus bias check
(5-6-4 : See page 25)
(5-6-3 : See page 24)
Focus bias check
(5-6-4 : See page 25)
C PLAY check
(5-6-5 : See page 25)
(5-6-5 : See page 25)
Self-recording/playback
check
(REC/PLAY)
(5-6-6 : See page 25)
check
(REC/PLAY)
(5-6-6 : See page 25)
TEMP check
(Temperature
compensation
offset check)
(5-6-1 : See page 24)
(Temperature
compensation
offset check)
(5-6-1 : See page 24)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace 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
• 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
• 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.
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 CN821, and power off or del AC cable, and then attach it again. Remove the AC code, and wait for about
five seconds, and turn on the power again, and put the short-pin.
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 CN821, and power off or del AC cable, and then attach it again. Remove the AC code, and wait for about
five seconds, and turn on the power again, and put the short-pin.
[MAIN BOARD] (Component Side)
CN821
10
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.
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
During playback
: Information such as type of disc played, part played, copyright.
These are displayed in hexadecimal.
Procedure:
1. Load a recordable disc whose contents can be erased, into the unit.
2. Press the MENU/NO button (MD). When “Edit/Menu” is displayed on the LCD display, Rotate the l L knob (MD) to display
1. Load a recordable disc whose contents can be erased, into the unit.
2. Press the MENU/NO button (MD). When “Edit/Menu” is displayed on the LCD display, Rotate the l L knob (MD) to display
“All Erase??”.
3. Press the ENTER/YES button (MD).
4. “All Erase??” is displayed on the LCD display.
5. Press the ENTER/YES button (MD) to display “Complete!!”, and press the s button (MD) immediately. Wait for about 10 seconds
4. “All Erase??” is displayed on the LCD display.
5. Press the ENTER/YES button (MD) to display “Complete!!”, and press the s button (MD) immediately. Wait for about 10 seconds
while pressing the button.
6. When the “MD Blank disk” displayed on the LCD display goes off, release the s button (MD).
7. Press the z REC button (MD) to enter recording standby. Then press the S button (MD) and start recording. In about 2 seconds, the
7. Press the z REC button (MD) to enter recording standby. Then press the S button (MD) and start recording. In about 2 seconds, the
record mode retry cause is displayed. (Fig.1) If recording cannot be performed, rotate the FUNCTION konb (TA) and set a different
section.
section.
8. To check the “track mode”, stop recording by pressing s button (MD) and press the H button (MD) to start play and the track
information in the play mode appears.
9. To exit the test mode, press the ?/1 button (TA), and turn OFF the power. When “STNDBY” 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
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
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
Fig. 1 Reading the Test Mode Display
(During recording and stop)
(During recording and stop)
RTs@@c##c**
Fluorescent display tube display
@@ : Cause of retry
##
##
: Number of retries
**
: Number of retry errors
Fig. 2 Reading the Test Mode Display
(During playback)
(During playback)
@@####**$$
Fluorescent display tube display
@@ : Parts No. (name of area named on TOC)
##
##
: Cluster
**
: Sector
$$
: Track mode (Track information such as copyright
information of each part)
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
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
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
Higher bit : A = 1010
t b7+b5
Lower bit : 2 = 0010
t b1
The retry cause in this case is combined of “Access fault”, “IVR rec error”, and “ader5”.
Reading the Retry Cause Display
11
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.
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”.
“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”.
“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
12
SERVICING POSITION
1. Remove the four screws securing the upper case, and remove the upper case.
2. Remove the three screws A securing the rear panel.
3. Remove the two craws B securing the MAIN board.
4. Remove the MAIN board with the rear panel.
2. Remove the three screws A securing the rear panel.
3. Remove the two craws B securing the MAIN board.
4. Remove the MAIN board with the rear panel.
A
B
B
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