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XL-V184BK
XL-V284BK
Spindle
section
Note)
When checking the voltages between p i n l l and pinl2 of IC801 with an
oscilloscope, do not connect the other probes.
Is the pin21, 22 of
IC801 +10V?
NO
YES
Does the spindle
motor stop i n the
STOP status?
NO
YES
Does the disc
accelerate to rotate
after closing the tray?
NO
YES
Does the disc rotate
smoothly in the
P L A Y status?
NO^
YES
Does the spindle
motor stop soon after
the Stop Button is
pressed?
NO
YES
OK
Check the power
supply circuit.
Is pin29 of IC401
2.5V(VREF) fixedly?
NO
Check IC401 and
associated components.
YES
Defective IC801
Is the voltage approx +5V
between p i n l l and pinl2 of
IC801 for approx 400ms?
(pinl2 must be the basis)
NO
Can the foUowing
waveform be observed
at pin24 of IC401?
2.5V
(VREF)
n
L.
J
Approx 400rm
YES
Check the spindle
motor and wiring.
NO
Check IC401
or IC201.
YES
Check IC801 and
associated components.
The foUowing waveforms
must appear by observing
between p i n l l and pinl2 of
IC801 during playing the
inner side of the disc.
(pinl2 must be the basis.)
eoomv
500mV/div
50ms/djv
NO^
Does the signal from pin25
of IC401 show the
foUowing waveform during
playing mode?
2.5V
(VREF)
O
- •
Approx 135pS
50pj/div
YES
Check the spindle
motor and wiring.
NO
YES
Check IC801 and
associated components.
Check IC401
and IC201.
Check the R F
signal and pickup.
Is there approx — 4V
between p i n l l and pinl2
of IC801 for 300~600m8
when stopped?
(pinl2 must be the basis.)
NO,
YES
Check the spindle
motor and wiring.
Is there the foUowing
signal at pin24 of
IC401 when stopped?
3 0 0 ~ 600ms
2.5V
5V|
1
(VREF)
'
'
Check IC401 or IC201.
YES
Check IC801 and
associated components.
(No. 20503) 1-29
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