CD-E770
Fram ® on page
8.
Is
there any drive
output
at
the spindle
motor
(disc)?
Between pin
1
of terminal
JP3 (fQ1
emitter) and
ground:
Starting:
2.8V
During play: 0.8V
Stopped: OV
YES
Check or exchange spindle
motor.
From
© on page 8.
NO
YES
Is
there any
output
at pin 45 (SP)
of
wICS
(CXAI082AS)?
~ :ing: 3.5V
Starting
Stopped: -0.5V
During
play:
About
1V
Faulty
wQ1
or wQ2.
NO
Is
the level of Input
at pin
41
(MON) of
wlC3
(CXAI
082AS)
"H"?
YES
Faulty
wlC3(CX1082AS).
NO
Faulty wlC4
(CXD1125Q2).
SOOit
'Monitor
the
waveform
at
the GFS terminal
with
the oscilloscope
set
to 5ms/DIV. Carry out adjustments so that there are one or —
two nan-ow
"L"
level pulses on the
screen.
The servo system
will
function. Does the
motor
rotate at the correct speed?
Does the level at pin
23
(GFS) of wlC6
(CXP5034H)
change to
"H"?
("H"
during frame sync.)
YES
Faulty microprocessor or display circuit.
NO
•
Check RF
and
EFM
signals.
f
AdjustPLL
circuit
(VOO).
Faulty wlC4
(CXD1125ÓZ)
orwlC3 (CXA1082AS).
•
Check tracking servo circuit.
Is
there any
output
at
Tl of
TP2?
Tracking OFF: 2Vp-p During Play:
-1
Vp-p
Is
there any
output
at FO of
TP3?
Tracking OFF: no
output
During
Play:
3.5Vp-p
•
Adjust tracking (offset)
•Readjust
focus (offset)
: is i
3-2. Checking the Tracking Servo Circuit
The spindle
motor
(disc)
rotates
even
when
the tracking servo
is
OFF.
1)
Ground
T2 of TP2.
2)
Check the
waveform
at T1
of TP2 (tracking OFF).
No input to pin
3
of
wlC3
(CXA1082AS).
3-3. Checking the Focus Servo Circuit
1)
Check the
waveform
at
F1
of TP2.
2Vp-p
0.5ms/DIV
1 (1
0.2Vp-p
0.5ms/DlV
3)
Check the
waveform
at
Tl of TP2 (tracking ON, during Play).
2)
Check the
waveform
at
TO of
TP3.
3)
Ground
F1
ofTP2.
(1(1».A
G.5Vp-p
IVp-p
4)
Check the
waveform
at FO of
TP3
(no
waveform
is
output
when
tracking is OFF).
(Ground
T2 of TP2.)
0.15V
Repeated
fiuctuation in DC voltage.
-0.18V
1
§
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