Pioneer X-EM11V Service Manual page 14

1
A [2] Operations with a USB memory device not possible
"NO USB" is displayed.
1. Check power from U901 (SPHE8202RQ-D) and XP906.
2. Check the communication line between IC701 (CA6817) and U901 (SPHE8202RQ-D).
[3] Data in a USB memory device cannot be played.
Data in the USB memory device cannot be played even if the USB operation key is pressed.
1. Check the DP data line.
2. Check the DM data line.
B
USB system check
Select the USB function, by pressing the INPUT button on the main unit (USB button on the remote control unit),
then plug a USB memory device into the USB connector.
1. Can the device information be displayed?
Yes
2. When a 1-kHz signal is played, are the
waveforms indicated in Fig. 8 output from
Pins 65 and 66 of U901?
Yes
C
3. Are the waveforms indicated in Fig. 8 output
from Pins 23 and 24 of IC504?
Yes
4. Are the waveforms indicated in Fig. 8 output
from Pins 22 and 32 of IC302?
Yes
5. If Yes, check the periphery of IC302.
Replace the MAIN Assy.
D
7 U901 - pin 80 (DM)
V: 2 V/div. H: 500 ns/div.
8 U901 - pin 79 (DP)
V: 2 V/div. H: 500 ns/div.
7
E
8
Fig. 6 Waveform
F
14
1
2
No
Check Pins 80 and 79 of U901 or check the
peripheries of Pins 12, 13 and 5. (See Figs. 6 and 7.)
No
Check Pins 65 and 66 of U901.
No
Check the periphery of IC504.
No Check the peripheries of IC601.
(X-EM21V only)
9 U901 - pin 12 (DVD-TXD)
V: 2 V/div. H: 500 μs/div.
a U901 - pin 11 (DVD_RXD)
V: 2 V/div. H: 500 μs/div.
b U901 - pin 5 (URST#)
V: 2 V/div. H: 500 μs/div.
9
a
b
Fig. 7 Waveform
X-EM21V
2
3
Replace the MAIN Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
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. 8 Waveform
3
4
4