Pioneer CRT3452 Service Manual page 81

5
-
Outline
[Stage 5] is used for measuring a servo system.
-
Operation Flow of [Stage 5]
If less than 255 track jumps are executed in
the track jumps of [50180000] and [50190000],
the track jumps are repeated at regular intervals.
When they must be stopped, they can
be stopped with [50170000].
Track Jump
(Outer Circumference)
(Inner Circumference)
50180000
Carriage Move to
Carriage Move To
Inner Circumference Outer Circumference
50110000
[50100000] and [50110000] move
while the execution key (DISC key) is
being pressed. Both are valid when
the tracking servo is OFF.
-
Example of Test Execution
•
CD error rate measurement:
→
Execute [50250000] [5027000]
•
Tilt servo measurement:
→
Execute [50250000] [5027000]
•
Focus Jump measurement:
→
Execute [50250000] [5027000]
•
Track jump measureme:
→
Execute [50250000] [5027000]
5
6
Stage 5
∗∗ Be sure to execute [50250000], [50260000] and [50270000].
If they are not executed, a servo system is not stable,
and [50180000] and [50190000] may not be able to be executed normally.
The execution procedure is [5025] to [5027] to [5026] to [5025].
Execute [5025] once at the beginning and end respectively.
Track Jump
FT Gain
Adjustment
50190000
50260000
Tilt Servo
Operation Start
50100000 50350000
Automatic Adjustment
Spindle CAV
Value Display
Operation
50240000
50300000
→ →
[50260000] [50250000] and [50200000] Measurement in this order.
→ →
[50260000] [50250000]
→ →
[50260000] [50250000] and [50150000] Measurement in this order.
→ →
[50260000] [50250000]
XDV-M8357ZT/UC
6
7
From Stage 4
Tracking
Close
40140000
Stage 5
Servo Waveform Confirmation Mode
FB Automatic RF Automatic
Adjustment
Adjustment
50270000 50250000
Tilt Servo Focus Jump
Operation Stop 50150000
50360000
Replayed Status
Display
50040000
→
[50350000] Measurement and [50360000] in this order.
→
[50180000] or [50190000] Measurement in this order.
7
8
Tracking Tracking
Open
Close
50170000 50140000
CD Error
Rate Measurement
50200000
Return to Return to
Stage 1 Stage 2
50020000 50050000
Test Start Servo
Initialization
10940000 20060000
To Stage 2
To Stage 1
8
A
B
C
D
E
F
81