Sony MDS-SD1 Service Manual page 13

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, rotate the – ˜ + knob to display "All
Erase?".
3. Press the ENTER/YES button.
4. When "All Erase??" is displayed on the fluorescent indicator tube.
5. Press the ENTER/YES button to display "Complete!!", and press the π button immediately. Wait for about 15 seconds while pressing
the button.
6. When the "TOC" displayed on the fluorescent indicator tube goes off, release the π button.
7. Press the r REC button to start recording. Then press the fl button and start recording.
8. To check the "track mode", press the fl 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.
If the test mode cannot be exited, refer to "Forced Reset" on page 8.
Fig. 1 Reading the Test Mode Display
(During recording and stop)
RTs@@c##c**
Fluorescent display tube display
@@ : Cause of retry
## : Number of retries
** : Number of retry errors
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
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 b2
The retry cause in this case is combined of "access fault", "IVR rec error", and "ader5".
Lower Bits
Hexa-
Cause of Retry
4 2 1
decimal
01 shock
0 0 1
02 ader5
0 1 0
04 Discontinuous address
1 0 0
DIN unlock
0 0 0 08
FCS incorrect
0 0 0 10
IVR rec error
0 0 0 20
40 CLV unlock
0 0 0
80 Access fault
0 0 0
Fig. 2 Reading the Test Mode Display
(During playback)
@@####**$$
Fluorescent display tube display
@@ : Parts No. (name of area named on TOC)
## : Cluster
} Address (Physical address on disc)
** : Sector
$$ : Track mode (Track information such as copyright
information of each part)
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
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Occurring conditions