Pioneer X-EM11V Service Manual page 13

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3. Spindle motor system check
Does the unit try to start playing when the
OPEN/CLOSE button is pressed without a disc loaded?
No
1. Can the spindle motor turn a little?
(See the waveforms in Fig. 4.)
No
2. The spindle motor cannot turn.
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.
1
4
Fig. 4 Waveform
4. Miscellaneous
The RF waveform is normal and the time is displayed normally, but no sound is output or sound is interrupted.
1. Are the waveforms indicated in Fig. 5 output
from Pins 65 and 66 of U901 when a 1-kHz
signal is played?
Yes
2. Are the waveforms indicated in Fig. 5 output
from Pins 23 and 24 of IC503?
Yes
3. Are the waveforms indicated in Fig. 5 output
from Pins 22 and 32 of IC504?
Yes
4. If Yes, check the periphery of IC302.
Replace the MAIN Assy.
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.
5
6
Fig. 5 Waveform
5
6
Yes
The circuit of the spindle-motor driver is normal.
Yes
Check the peripheries of Pin 114 of U901 and
Pins 11, 12 and 4 of U903.
No Error correction is not possible because of
scratches or dirt on the disc.
Check if playback is possible, using a proper
disc.
No
Check the periphery of IC504, U907, Q917 and
Q918.
No
Check the peripheries of IC601. (X-EM21V only)
X-EM21V
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7
Replace the MAIN Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
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8
A
B
C
D
E
F
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