Nokia RM-51 Service Manual page 134

RM-51
Nokia Customer Care Baseband troubleshooting
If the interface is faulty from the UPP_WD2's end, the phone does not boot properly as powering configurations
do not work.
Traffic on the bus can be monitored at the following test point and pins.
• R640 (test point J193 side)
• CBusEN1X J378 Pad
• CBusDA J377 Pad
The pads and pins are shown in the figures below.
CBUS test points
Figure 89 CBusClk test point
Figure 90 CBUS test points
The CBUS traffic is shown in the following figure (read command to ZOCUS, LM3820, N130).
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