Pioneer CDJ-900 Service Manual page 31

5
[4] USB (Type A/Type B)
[4-1] No communication via the USB connector (Type A)
Check the following, with a USB device connected to the USB A connector.
No. Cause Diagnostics Point
USBA Assy
Loose
1
connections
/MAIN Assy
V+5_USB_HOST
2 _VBUS is MAIN Assy
defective.
The USB PAWED
3 MAIN Assy
IC is defective.
/Signal errors
Defective MAIN
4 MAIN Assy
CPU
[4-2] No communication via the USB connector (Type B)
Check the following, with a USB device connected to the USB B connector.
No. Cause Diagnostics Point
Loose
1
connections
Defective
2
USB
CONTROLLER
[5] LAN
[5-1] No LAN communication
Check the following, with a peripheral device connected to the Ethernet connector.
No. Cause Diagnostics Point
Loose
1 MAIN Assy
connections
Defective
ETHER PHY
2 MAIN Assy
CHIP or MAIN
CPU
5
6
Item to be Checked
Check the connection of the USB
communication line.
Check V+5_USB of the USB power supply.
Check the CPU_USB_HSTPWREN and
CPU_USB_HSTPWRFL signals from the
USB POWER HIGHT SIDE SW(IC1102)
If the symptom persists after the above
corrections,
Item to be Checked
Check the connection of the signal lines
(USB_D+/USB_D-).
If the symptom persists after the above
corrections,
Item to be Checked
Check the connection of the periphery
circuit of ETHER PHY CHIP (IC1304).
If the symptom persists after the above
corrections,
CDJ-900
6
7
Corrective Action
If connection is improper, resolder it.
If connection is proper, go to step [2].
If V+5_USB cannot be confirmed, check V+5. If the V+5 is
OK, then go to [3].
If V+5_USB can be confirmed, go to [4].
If the CPU_USB_HSTPWREN signal does not become H,
check the connection. If the connection is OK, then the
MAIN CPU (IC101) is defective. Replace it.
If the CPU_USB_HSTPWRFL signal does not become H,
the USB POWER HIGH SIDE SW (IC1102) is in a state of
shutdown caused by abnormally high temperature.
Check the connection. If the connection is OK, then the
port may be damaged. Replace it.
The MAIN CPU (IC101) is defective. Replace it.
Corrective Action
If connection is improper, resolder it.
The USB CONTROLLER (IC1101) may be defective.
Replace it.
Corrective Action
Check the connections of the communication line.
If connection is improper, resolder it.
The ETHER PHY CHIP (IC1304) may be defective.
Replace it. If the symptom persists, the MAIN CPU
(IC101) may be defective. Replace it.
7
8
A
Reference
-
-
B
10.5 MAIN
ASSY(3/3),
USBA ASSY
-
Reference
C
-
-
D
Reference
-
-
E
F
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