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..
(
.
(
DR- UA124X-2, DR- UA124X-3
DR- UA124X- 5
Fig.
2 Adjustment
Locations
1. Focus Offset Verification
•Objective
Verify the DC offset for the
focus
error
amp.
•Symptom when out of
The
model
does
not
focus
in
and
the RF signal is
dirty.
adjustment
•Measurement instru-
ment
connections
[Procedure]
Connect
the oscilloscope to
VREF
(CHI),
FCS.
ERR
(CH2). Refer to
Fig.
2.
[Settings]
1
V/division
10
ms/division
DC mode
• Player state
Focus and spindle
servos
closed
•Adjustment location
None
•Disc
YEDS-
7
I.
Perform
the automatic
adjustment
(offset,
balance
and
gain)
at
the player
is play
backed
by pressing
the
PLAY key.
2.
Close the
focus
servo.
3.
Verify
the
focus
error
voltage
at closed
is
the
same voltage (A=B)
as the
VREF
voltage.
CH
1
r
:1; ••
Ii
.
1
· ..
l!iiliM!!l·.
~
-
r·
l
.Uii§
:
VREF
}
-GND
Note : If the specified values cannot be obtained or no adjustment is possible by performing the verifications
or adjustments described in
adjustment
items 1
-
3, the pickup block may be
defective.
25
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