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I
(
.
I
DR- R504X
6. Main and Sub Mix Ratio Adjustment
(Adjustment
2)
•Objective
To mix the
gain
of the main
signal output and sub signal output of the pickup.
•Symptom when out of
Player does not playback.
adjustment
•Measurement instru-
Connect
the
oscilloscope
to
ment connections
CHI : TP2 (CN104), Pin l
(STE)
[Procedure]
CH2: TP2
(CN104),
Pin
2
(MSTE).
[This connection
may
be via a
L.P.F.
(39k
Q
+
l
OOOpF).]
[Settings]
CH l
:
5
mV/div.
AC mode
l
ms/div. ADD
mode.
CH 2
:
10
mV/div.
AC
mode
(Match
the
GND
level
of CHI
and CH2.)
• Player
state
•Adjustment
location
•Disc
Spindle rotation
frequency
: Normal
speed, focus
ON,
spindle
ON/
tracking OFF
VR3 (MS. MIX)
YEDS
-
7
1.
Spindle rotation
frequency
:
Normal
speed, focus
ON and spindle ON to move the
pickup
to
midway across the disc.
2. Set the oscilloscope to ADD mode (waveform adding mode of CHI and
CH2) and observe the
adding waveform
of
CHI and
CH2.
3. Adjust VR3
(MS.
MIX) so that the amplitude of waveform
becomes minimum.
·
1
·T-···-r
!(!0
--1--+----1--t---!-~--t---1--+---+-
J
"I
···T:l
1
-r-1·· · +
·
1
-
.
. l.·
1
.L
,t,,
Out of
adjustment
Optimum
adjustment
39
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