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RH-51/52, RH-67/68 Company Confidential
6(a) - Baseband Troubleshooting Nokia Customer Care
Page 16 © 2004 Nokia Corporation. Issue 3 09/2004
age levels.
The interface voltage level on the phone flash/test pad pattern is 2.78V and on the
UPP_WD2 end it is 1.8V. MBUS traffic between UPP_WD2 and UEME can be tested with
Phoenix (ST_MBUS_RX_TX_LOOP_TEST). Flashing is not possible if there is a problem in
MBUS. The MBUS signal can also be seen at flashing test pads and the pad layout is
shown in the following figure.
Figure 9: Flash interface layout (FBUS/MBUS test pads layout)