Sony MZ-N420D Service Manual page 15

5. The display changes a shown below each time the
key is pressed.
• Address & Adjusted Value Display
Set LCD display
011
C 6 8 S 1 6
• Jitter Value & Adjusted Value Display
Set LCD display
011
0 F E J 1 6
• Block Error Value & Adjusted Value Display
Set LCD display
011
0 6 3 B 1 6
• ADIP Error Value & Adjusted Value Display
Set LCD display
011
0 4 9 A 1 6
• Focus Drive Value & Adjusted Value Display
Set LCD display
011
0 0 0 F 1 6
• Item Title Display
Set LCD display
011
L r e f P w
However in the power mode (item number 700's), only the
item is displayed.
6. Quit the manual mode, and press the x/
turn to the test mode (display check mode).
[MENU]
item number
adjusted value
address
item number
adjusted value
jitter value
item number
adjusted value
block error value
item number
adjusted value
ADIP error value
item number
adjusted value
focus drive value
item number
item title
CANCEL key to re-
Overall Adjustment Mode
Mode to adjust the servo automatically in all items.
Normally, automatic adjustment is executed in this mode at the
repair.
For further information, refer to "SECTION 5 ELECTRICAL
ADJUSTMENTS" (see page 18).
Self-Diagnosis Result Display Mode
This set uses the self-diagnostic function system in which if an
error occurred during the recording or playing, the mechanism
control block and the power supply control block in the micro-
computer detect it and record its cause as history in the nonvola-
tile memory.
By checking this history in the test mode, you can analyze a fault
and determine its location.
Total recording time is recorded as a guideline of how long the
optical pick-up has been used, and by comparing it with the total
recording time at the time when an error occurred in the self-diag-
nosis result display mode, you can determine when the error oc-
curred.
Clear both self-diagnosis history data and total recording time, if
the optical pick-up was replaced.
• Self-Diagnosis Result Display Mode Setting Method
1. Set the test mode (see page 13).
2. In the display check mode, press the
the self-diagnosis result display mode where the LCD display
as shown below.
Set LCD display
0XX
1 0 0 0 0
history code
3. Then, each time the key is pressed, LCD display descends
>
by one as shown below. Also, the LCD display ascends by one
when the key is pressed.
.
0 XX 1 * * * *
0 XX N * * * *
0 XX N 1 * * * *
0 XX N 2 * * * *
0 XX R _ * * * *
XX
: Error code
* * * * : Total recording time
[GROUP]
If the key is pressed with this display, the LCD switches
to the simple display mode.
4. Quit the self-diagnosis result display mode, and press the
key to return to the test mode (display check mode).
x/CANCEL
MZ-N420D
[GROUP]
key activates
error display code
Total recording time
when error occurred
15