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DR- R504X
5. ADJUSTMENTS
• Adjustment and Check Items
Perform the adjustment of this
model
in the order as
shown
below.
(Adjustment
1)
1. Playback power adjustment
2. Coarse
focus offset
adjustment
3. Coarse skew adjustment
4.
Grating adjustment
5.
DPP
(tracking offset) adjustment
6. Fine skew
adjustment
7. Grating
re-adjustment
(Adjustment 2)
1. YCO
free-run
frequency adjustment
2. Slider speed
control
offset
adjustment
3.
Playback power
re-adjustment
4.
Recording power
adjustment
5.
Focus
offset
adjustment
6. Main and Sub mix ratio adjustment
7. Tracking
amp.
gain
adjustment
8. Tracking offset adjustment
9. Fine focus offset adjustment
10. Focus servo
loop
gain adjustment
11
.
Tracking servo
loop
gain
adjustment
12. YCO free-run frequency verification
13.
WBL offset
adjustment
• Measuring Equipment
28
1.
Dual
trace oscilloscope ( 10: 1 probe)
2.
Laser power meter
3.
Test
disc
(YEDS
-
7)
4.
CDR
disc
with
recorded
(Type
No.
CD
-
R63, manufactured by TDK.)
5.
Low-pass filter (39k Q
+lOOOpF)
6.
Hight-pass filter (3.9k
Q
+180pF)
7.
Signal
generator
8. Frequency
counter (measurable over
lOMHz)
9.
Hexagonal
screwdriver
( 1.5mm diagonal)
10.
Other
general
tools
• Adjustment Points and Their Names
YRl
:
WBL offset (WBL.
OFS)
YR2
:
Tracking
amp
gain
(TE.
GAIN)
VR3
:
Main and Sub mix ratio (MS. MIX)
YR4
:
Tracking offset
(TE. OFS)
YRS
:
Playback power
(PB.
PW)
VR6
:
Focus
offset
(FE.
OFS)
VRlOl
:
Slider
speed
control
offset (SLD. OFS)
YRl 04
:
Recording power
(REC.
PW)
VR601
:
Focus servo
loop
gain (FCS. GAIN)
VR602
:
Tracking servo loop
gain (TRK. GAIN)
L603
:
VCO adjustment (YCO ADJ)
Radial/tangential
adjustment
screws
of pickup
:
Skew
Grating adjustment
slit
of pickup
: Grating
HEAD UNIT
DD
VR1
D
0
~
VR6
c:::::::::J
0
0
VR3
DD
~~
g
TP2
g
(CN104)
D
I
o
VR2
VR10:MR
4
,g
VRS
VR101
~
I
0
TPl
(CN103)
7
D
D
D
C:::::J
D
c:::::::i
~
DocbJ
D
CN702
D
D
D
CN609
D
VRDI
0Mfff1005
0100~1002
D
~
VR~2
CN1004
0
D
L603
8"010030
D
DD
TP201
~I
01004
(CN60
1)00
7
0
00
D
~~
D
MAIN UNIT
D~l
JoO
Fig.
1 Adjustment point
(
(
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