Denon DCD-425 Service Manual - Page 14

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DCD425/335 ADJUSTMENT 1. Adjustment method (1) Necessary equipment for adjustment 1. Dual trace oscilloscope 2. Reference disc TOMITA YASUKO Input (Generator) (CA-1094 or CA-1094A) 3. Oscillator (10 Hz - 10 kHz, 0 - 3 Vp-p) 4. Frequency counter (readable no less than 5 kHz) 5. Lissajous jig Input (Main unit) OSC INPUT Lissajous jig INPUT 22k GND OUTPUT 10k 4700P GND T 0.022µ 4700P 10k Output (Oscilloscope) (2) Location JK251 JK301 JK252 VR102 OO VR101 (TE.G) (TE.8) VR103 (FE.O) TP1 TP5 MAIN UNIT (Component side) TEST POINT 0 TP1: TEO TP2: TEI TP3: FEO TP4: RFO TP5: GND 0 (3) Preset 1. Preset VR101 to 103. 2. Step. FRONT PANEL SIDE I VR103 (Focus offset) 3 O'clock VR101 O (Tracking offset) 3 O'clock 1. Focus offset 2. Tracking offset 3. Tracking gain VR102 (Tracking gain) 3 O'clock 14

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DCD425/335
ADJUSTMENT
1.
Adjustment
method
(1)
Necessary
equipment
for
adjustment
1.
Dual
trace
oscilloscope
Input
2.
Reference
disc
TOMITA
YASUKO
(Generator)
(CA
-1094
or
CA
-1094A)
3.
Oscillator
(10
Hz
-
10
kHz,
0
-
3
Vp-p)
4.
Frequency
counter
(readable
no
less
than
5
kHz)
5.
Lissajous
jig
Input
(Main
unit)
(2)
Location
(3)
Preset
1.
Preset
VR101
to
103.
VR103
VR101
O
VR102
(Focus
offset)
(Tracking
offset)
(Tracking
gain)
3
O'clock
3
O'clock
3
O'clock
2.
Step.
1.
Focus
offset
2.
Tracking
offset
3.
Tracking
gain
Lissajous
jig
OSC
INPUT
INPUT
22k
GND
10k
4700P
GND
OUTPUT
10k
0.022μ
T
4700P
JK251
JK301
JK252
VR102
(TE.G)
VR101
OO
VR103
(TE.8)
(FE.O)
TP1
TP5
MAIN
UNIT
(Component
side)
FRONT
PANEL
SIDE
0
0
I
TEST
POINT
TP1:
TEO
TP2:
TEI
TP3:
FEO
TP4:
RFO
TP5:
GND
Output
(Oscilloscope)
14