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DR-2111, DR-UP124X-5
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Fig. 3 Adjustment Locations
1. Focus Offset Verification
•Objective
• Symptom when out
of adjustment
• Measurement
instrument
connections
[Procedure]
Verify the
DC
offset for the focus error amp.
The model does not focus in
and
the
RF signal
is
dirty.
Connect the oscilloscope to
• Player state
VREF(CHl),FO
.
ERR
(CH2).Refer
to
Fig. 3.
•
Adjustment
location
[Settings]
1
V/divsion.
lOms/divsion.
DC mode
•Disc
Focus
and spindle servos closed
None
YEDS-7
1. Perform
the automatic adjustment (offset,
balance
and gain) at
the
player is playbacked by pressing
the
PLAY key.
2. Close the focus servo.
3. Verify the focus error voltage at the closed is the same voltage (A=B) as the VREF
voltage.
CH1• ........ , •.•••
-.r-.1.•
.
.r•1 . .
1 . .
_11~n~~~.-
.
.
.
VREF
lA
-GND_L_
A=B
CH211
w
r
lit#'
•ae ttua•
PAI
.
--
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.
2
0
(
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