Aiwa XP-SP90, Руководство по обслуживанию

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16
The tracking balance set value is displayed by
hexadecimal notation in the 16 steps.
Display range of set value: 00 to 0F
Default value of setting (center value): 08
1 Tracking balance check
• Test point: TEO & VC
• Test disc: TCD-782
Press the DSL key while in PLAY MODE then turned
off tracking servo. Confirm that the TE waveform as
shown below appears.
0
±
10mV
A
B
VREF
A=B VOLT/DIV: 500mV
TIME/DIV: 0.2mS
2 Tracking balance control by the manual control
The tracking balance value can be set to any desired
value by pressing the F. Skip key or B. Skip key during
the tracking balance check mode.
The 16 steps can be set in the range from 00 to 0F.
(Center value: 08)
3) Tracking Gain (Radial Gain)
When the machine enters the tracking gain check mode,
the following display appears on LCD.
Tracking gain Tracking gain set value
The tracking gain set value is displayed by hexadecimal
notation in the 16 steps.
Display range of set value: 40 to 4F
Default value of setting (center value): 48
1 Tracking gain control check by the manual control
The tracking gain can be set to any desired value by
pressing the F. Skip key or B. Skip key during the
tracking gain check mode.
The 16 steps can be set in the range from 40 to 4F.
(Center value: 48)
When any attempt is made to change the tracking gain
using the F. Skip key or B. Skip key while observing the
TEO waveform on an oscilloscope, the tracking gain
change can be confirmed as follows.
a) Traverse waveform amplitude change
• Test point: TEO & VC
When the tracking gain is changed during the traverse
mode, the waveform amplitude change can be
confirmed.
Note)
The manual control of the focus bias, tracking balance
and tracking gain can be operated only when the test
mode has started up. Microprocessor performs all items
with automatic adjustment during the normal CD
playback mode so that the manual operation is not
possible. Even when the level setting is made during the
manual operation in the test mode, the set values are
reset when the machine exits the test mode, and the
manually set values are not memorized too.
4. Display of Jitter Change Value
The jitter value is displayed during the focus bias check
mode.
The “00” display is equivalent to the jitter amount when a
glass disc is played back. The display value shows the actual
jitter deviated from the “00” value. The jitter value is
displayed in the 256 steps from 00 to FF.
Bias set value Jitter display