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No.
Symptom
10
No sound
USB devise does not
11
work(a PC does not
detect an USB Hub)
USB devise does not
work(a PC does not
12
detect an USB
devise)
A connected USB
devise in self-
13
powered does not
work
Check Points
Is the wire harness between Audio
6
PCB and DC IN PCB securely ?
Is the wire harness to speakers
7
securely ?
8 Is the Audio PCB defective ?
Is a LCD monitor connected to an USB
1
devise securely with USB cable ?
Upon a timing, a PC does not detects
2
an USB Hub
Upon a PC's OS or version, a PC
3
cannot control USB devise
Is the wire harness between main PCB
4
or DC IN PCB and USB PCB secured
firmly ?
Is the wire harness between USB PCB
5
and a relay PCB for USB secured
firmly ?
6 Is the USB PCB defective ?
Is a LCD monitor connected to an USB
1
devise securely with USB cable ?
Upon a timing, a PC does not detects
2
an USB devise
Is the driver software for a USB devise
3
loaded correctly ?
4 Is the USB PCB defective ?
Is the USB devise in self-powered
1
connected with a LCD Monitor AC is
not providing ?
Is the connection between the USB
2
PCB and DC IN PCB secured firmly ?
3 Is the USB PCB defective ?
A It is possible to treated by end-user
B It might be possible to treat by end-user in some case.
C It must be treated by Professional Technical Staff
- 6 -
Treatments
Ensure the connection of a wire
harness
Ensure the connection of a wire
harness
Replace the Volume PCB with
new one, and check the screen
Ensure the connection of the
USB cable
Reinstall the USB cable
Refer to the user's manual for a
PC and OS. Ensure a PC
supports USB
Ensure the connection of a wire
harness
Ensure the connection of a wire
harness
Replace the USB PCB with new
one
Ensure the connection of the
USB cable
Reinstall the USB cable
Refer to the user's manual for an
USB devise. Reload it to a PC.
Replace the USB PCB with new
one
Provide AC power to a LCD
Monitor. Check Warning is not
displayed. Refer to the User's
manual for an USB devise,
connect an AC Adapter to a LCD
Ensure the connection
Replace the USB PCB with the
new one
Class
B
B
B
A
A
A
B
B
B
A
A
A
B
A
B
B
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