Denon DCD-3300 - Page 22

(8) Adjustment of Tracking Gain
a) Adjust it in the same condition as to focus gain,
push play button (» PLAY) to activate all servo
for adjustment except the measuring equipment
connections.
(2) Audio oscillator should be connected while the
servo is in operation.
If the connection is made before servo operation,
causing mis-operation.
If the connection is made in failure, disconnect
oscillator, push stop button (™ STOP) to stop all
operations, and follow the steps from the. begin-
ning.
8) Connection of measuring equipment.
@ Connect the respective measuring equipments
to the test point TP-201 of servo main P.W.B.
(KU-6040) as illustration shows.
TEOX
Pin @ of TP-201
TEIX
Pin © of TP-201 ©
GND
Pin @ of TP-201 0
% TEO: Track Error Out
TEI: Track Error In
(9) Check of Tracking Offset
@
Check
the
adjustment
performed
in
the
previous
column (5).
@ Push stop button (™STOP) to stop disc
revolution.
@
With
a
sufficient
interval
of
time
in
between,
push
play
button
(»
PLAY)
twice
and
check
that
the
disc
starts
to
run.
Note: The microcomputer employed in the unit
sometimes does not accept button opera-
tion. If so, push the button again. Confirm
that “2” on the calendar fails.
@) Adjustment
@ Set the output of audio oscillator to 1.8 kHz
+ 120 Hz, 2 Vp-p + 0.1 V.
® Connect two filters as per illustration.
@ Select oscilloscope input to X-Y mode so to
observe Lissajous waveform. (Select DC range
both X and Y inputs.)
e@ Adjust VR-202 and obtain Lissajous waveform
symmetric to X and Y axes. The waveform is
the same as focus gain adjustment.
Oscilloscope
Audio Oscillator
C_J Set to 1.8 kHz, 2Vp-p
Frequency Counter
@ Observe a waveform and check that the height
of upper and lower waveform are even to the
base line. (Reference value: Difference of height
between two is 5% or less.)
@ If the difference is beyond the value, adjust
VR-401. ©
@ That is all to complete adjustments.
@ Remove the signal pick-up connector with wires
from TP-401 of mechanism unit P.W.B. (KU-
6050) and TP-201 of servo main P.W.B. (KU-
6040).