Sony MDS-JA30ES Service Manual page 6

Reading the Retry Cause Display
Higher Bits
Hexadecimal
8 4 2 1 8
Bit
b7 b6 b5 b4 b3 b2 b1 b0
Binary
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 1
0 0 0 1 0
0 0 1 0 0
0 1 0 0 0
1 0 0 0 0
*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.
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 "spindle is slow" 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".
Hexadecimal n Binary Conversion Table
Hexadecimal Binary
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
Reference:
In this test mode, when the · 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
44 : 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.)
Lower Bits
Hexa-
Cause of Retry
4 2 1
decimal
01 shock *1
0 0 1
ader5
0 1 0 02
04 Discontinuous address
1 0 0
(Not used)
0 0 0 08
FCS incorrect
0 0 0 10
IVR rec error
0 0 0 20
40 Spindle is slow
0 0 0
80 Access fault
0 0 0
Hexadecimal Binary
8
1000
9 1001
A 1010
B 1011
C
1100
D
1101
E
1110
F 1111
— 6 —
Occurring conditions
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