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An7
E4n
\,\
II
+L
e.
• Press VOLUME
~
key (STEP Z),
the arm is de1lected
ou~
t
~ard
by
a
certain amount,
4-1
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c:f1. "C<"'
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• In
STEP
3
the arm is deflected
in~ard
by
the
same
amount as in STEP 2.
In this way it
is
possibleot_~
termine whether the influence of the flex PC boards has
been sufficiently compensated.
If
not,
the-1QrCeS can
be compensated by adjusting R62.
The
influences
of
the
flex board 10rces can
also
be
altered by heating the
flex
boards with
a
hair drier.
I
As
the following table shows,
the arm can be deflected
outward
and
inward by different amounts by
means
of
STEP 2 to STEP 9.
The
deflection of the radial arm depends on the mecha-
nical resistance of the bearings.
STep
Deflection
Curr ant
Focussing
CO Motor
1
nonE."
o
~A
off
011
2
outward
17
.
5
~A
ofl
off
3
inward
17.5
J.lA
oft
of
t
..
_-
4
outward
8.8 IJA
ofl
ofl
5
inward
8
.
8 IJA
of
I
oti
6
outward
<
T.
5 )JA
oli
off
7
inward
"7.
S
IJA
of f
off
i
8
outward
26
.3
J.1A
off
off
9
Inward
26
.
3 IJA
of
I
off
10
fully outward
35 .0 J.A
off
off
11
fully inward
35 .0
\lA
ofl
off
12
none
o
IJA
on
on
.
3
Inward
26
.
3
\lA
on
on
"14
PLAY
control
on
on
• STEP
10 moves the arm fully outward and
STEP 11
fully
in~ard
.
I
The focus control circuit can be checked with STEP
12.
Tn~
laser diode
is
activated and the focus control cir-
cuit moves the focus lens
.
I
STEP 13 naves tha arm inward,
to the table of contents
if a CD is mounted
.
I
STEP
14 causes the arm to
follo~
the
track.
However,
the
processor does not intervene in the
control.
Any
mechanical
vibration causes the arm to jump out of the
track.
After approximately
3
mInutes the CD
is
played
beginning
at
TRACK 1, the music
is
audible.
This
mode is used for checkIng the radial control cir-
~uit
as well
as
the PLL circuit
(cloc~
regeneration) on
the OECODER 80ARD 1
.
769
.
430.
(The EFAB signal on
1(10
pin36
(TPZ)
must be "L"
.
An uncorrectable error
has
occurred if it changes
to
log
.
"H").
• The
servic~
mode can be terminated
by
pressing
the
PO~ER
[24)
key
.
4.3.7
Adjusting
the
output level
of
the
LINE
AMPLIFIER
->
Fig. 4.11
Fig
.
4
.
'2
• Remove the top cover
(S~ction
2
.
2 1).
Connect
the
audiO
voltmeter to one of
the
balanced
outputs (251.
I
Play
t~s~
CO No
.
3,
TRACK 213
.
I
On
the LINE AMPLIFIER SOARD 1
,
769
.
277/
.
278 adjust
the
lel1-hand channel with trimmer potentiometer
Rl01,
and
the right-hand channel with R201
.
• On
the
LINE
AMPLIfIER
BOARD
~ITH
TRANSFORMERS
1 .769
.
277 00
align the left-hand Channel
for
minimal
distQrtlQn
with
trimmer potentiometer R109,
and
the
right-hand channel with R209
.
.
~
U
Hf
Al'Ii'l
HIER lP:ANS,F<»tHE'!UH
1.769
.Z7?J
.
OO
Fig. 4
,
11
llof
i
~"PUFlH
1.769
. 217
.00
R109
Fig. 4
.
12
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O
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11trn~m ~
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