13
X-EM21V
5
6
7
8
5
6
7
8
A
B
C
D
E
F
Replace the MAI
N
Assy.
Replace the MAI
N
Assy.
Does the unit try to start playing when the
OPE
N
/CLOSE button is pressed without a disc loaded?
1. Can the spindle motor turn a little?
(See the waveforms in Fig. 4.)
3. Spindle motor system check
N
o
Yes
Yes
1. Are the waveforms indicated in Fig. 5 output
from Pins 65 and 66 of U901 when a 1-kHz
signal is played?
2. Are the waveforms indicated in Fig. 5 output
from Pins 23 and 24 of IC503?
3. Are the waveforms indicated in Fig. 5 output
from Pins 22 and 32 of IC504?
Check the periphery of IC504, U907, Q917 and
Q91
8
.
4. Miscellaneous
Yes
2. The spindle motor cannot turn.
Check the peripheries of Pin 114 of U901 and
Pins 11, 12 and 4 of U903.
The circuit of the spindle-motor driver is normal.
N
o
N
o
Replace the MAI
N
Assy.
Replace the MAI
N
Assy.
Check the peripheries of IC601. (X-EM21
V
only)
N
o
Error correction is not possible because of
scratches or dirt on the disc.
Check if playback is possible, using a proper
disc.
N
o
Yes
4. If Yes, check the periphery of IC302.
Yes
1
U901 - pin 111 (FOSO)
V
: 0.2
V
/div. H: 1 s/div.
4
U901 - pin 114 (DMSO)
V
: 1
V
/div. H: 1 s/div.
Fig. 4 Waveform
1
4
5
U901 - pin 65, IC504 - pin 24, IC302 - pin 22 (Lch)
V
: 1
V
/div. H: 1 ms/div.
6
U901 - pin 66, IC504 - pin 23, IC302 - pin 32 (Rch)
V
: 1
V
/div. H: 1 ms/div.
Fig. 5 Waveform
5
6
The RF waveform is normal and the time is displayed normally, but no sound is output or sound is interrupted.
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