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PR-8210-A
Adjustment and Check Details
e FOCS
LOOP
OFFSET
Disconnect TP-8 and TP-1/6 from GND.
Push
PLAY key. While observing RF signal at TP-11,
adjust VR1 to obtain maximum RF signal.
Next, while observing FOCS error at TP-1, conform
the center of the waveform to a horizontal center
|
line оп СВТ.
Push REJECT key, verify the offset
i
voltage is O +0.1V.
If not, adjust VR1
to satisfy
the above.
• OPTICAL
PATH
CHECK
E.
This step has to be performed when the slider is
replaced or the probiem seems to relate with the
optical path.
|
Connect TP-8 and TP-1/6 to GND.
Push PLAY key
and scan to middle of the disc.
{
TRKG and TANG
mirrors are classified into five
|
ranks by their sensitivities as shown below and
their ranks designated on the connector housing.
Verify the mirror ranks.
Connect each end of jig
VR to *12V line and - 12V line of VSOP, and also
the center tap to TP-7 through the resistor corre-
sponding to the mirror rank,
Connect the scope to TP-5
Adjust the ji
and read the ү
VR
to obtain
maximum
TRKG
error,
із-геак amplitude:
Ето
Rotate the jig VA
so that тахи
уд
hve mirror
bias is риз to Т:
ror.
and
the peak te
peak amplitude
Rota:e th
0-44
Make зше
Ер
. Eto, and Ein > 0.65 . Eto
Likewise.
put mirror bias to TANG mirror at ТР-12,
and measure
TRKG
error peak-to-peak amplitudes
Eto, Ер and Etn at TP-5.
Then, make sure the
above.
С!
C2
C3
0
Е
59
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