Usb; Usb Troubleshooting - Nokia 6275 Baseband Description And Troubleshooting

Nokia Customer Care

USB

When the mobile terminal is connected to the computer using a DKU-2 or CA-53 data
cable, the PC provides Vbus (5V) to and pull down D+ a, d D – lines. The mobile terminal
responds by pulling the D+ line high. The PC then acknowledges and starts transferring
data at 12 Mbits/s.

USB Troubleshooting

When troubleshooting the USB, refer to
procedure to check these points:
1. Connect the mobile terminal to the Phoenix flash station using a DKU-2 or
CA-53 data cable.
2. Use the Windows Device Manager to see if the mobile terminal is recognized as a
USB device. You should see something similar to
• If recognized, there is no hardware fault and you can stop troubleshooting.
• If not recognized, perform a visual inspection on the Pop-port connector,
ESD Protection, NUT integrated circuit, capacitors, and inductors.
Issue 1 - September 2006
Baseband Description and Troubleshooting
Figure 28: USB block diagram
Figure 29
Figure 29: PC Device Manager
Company Confidential
6275/6275i (RM-154)
and Figure 30 and use the following
Figure 29.
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