Sony MDS-DRE1 Service Manual ▷ View online
– 5 –
FORCED RESET
The system microprocessor can be reset in the following way.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Method 2:
Disconnect the power plug, and short-circuit CN451 of the POWER
board with a pair of tweezers, etc.
Disconnect the power plug, and short-circuit CN451 of the POWER
board with a pair of tweezers, etc.
[POWER board] (Component Side)
Method 1:
Set TP (RESET) of the DIGITAL board to ground momentarily.
Set TP (RESET) of the DIGITAL board to ground momentarily.
[DIGITAL board] (Side A)
RETRY CAUSE DISPLAY MODE
• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent display tube.
This is useful for locating the faulty part of the unit.
• The retry cause, number of retries, and number of retry errors are displayed. Each is displayed in hexadecimal number.
Method:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the
[STOP]
button,
[ EJECT]
button,
[PAD1]
button simultaneously.
3. Press the
[ REC]
button, and start recording.
4. The ## value increases with each retry. If an error occurs after a retry, the @@ count will also increase.
5. To exit the test mode, press the
5. To exit the test mode, press the
[ ]
(POWER) button.
Fig. 1 Reading the Test Mode Display
R.T s
∗
∗
c # # e @@
Fluorescent Display Tube Signs
∗
∗
: Cause of retry
# #
: Number of retries
@@
: Number of retry errors
All three displays above are in hexadecimal numbers.
CN1
TP
(RESET)
IC101
CN901
BT451
1
2
CN451
(RESET)
§
r
U
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Reading the Retry Cause Display
*1 Some displays are not used depending on the microprocessor version.
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
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 “spindle is slow” and “ader5”.
When A2 is displayed:
Higher bit : A = 1010
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”.
Hexadecimal
n
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
Reference:
In this test mode, when the
In this test mode, when the
[PLAY/PAUSE]
button is pressed, and the disc is played back, the “PLAYBACK MODE” is set.
The display becomes as shown in Fig. 2. The playback mode is not used in particular during servicing.
44 ¢¢¢¢¢¢ p
Fig. 2 Display during Playback Mode
4 : Parts No. (Name of area named on TOC)
¢¢¢¢¢¢ : Address (Physical address on disc)
p : Track mode (Copyright information of each part, information on copyright, etc.)
¢¢¢¢¢¢ : Address (Physical address on disc)
p : Track mode (Copyright information of each part, information on copyright, etc.)
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 more than 3.5 shocks are detected
When ADER was counted more than
five times continuously
When ADIP address is not continuous
(Not used)
When not in focus
When ABCD signal level exceeds the specified range
When spindle rotation is detected as slow
When access operation is not performed normally
Hexa-
decimal
shock *1
ader5
Discontinuous address
(Not used)
FCS incorrect
IVR rec error
Spindle is slow
Access fault
Cause of Retry
Occurring conditions
01
02
04
08
10
20
40
80
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SECTION 2
GENERAL
NAMES AND FUNCTIONS OF PARTS
This section is e
xtr
acted from
acted from
instruction manual.
– 8 –
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