Nokia RM-57 Service Manual page 142

RM-57/58
Nokia Customer Care BB Troubleshooting and Manual Tuning Guide
Figure 49 USB 1: D-TXD (POP-PORT pin6) and D+RXD (POP-PORT pin7) voltage levels when USB connected.
Figure 50 USB 2: Take single triggered measurement on the rising edge of the Helen usb0_txen line.
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