Nokia 6265 Baseband Description And Troubleshooting page 11

Nokia Customer Care
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Signal voltage Signal voltage
levels are 2.78V levels are 2.78V
Production Production
Test Points Test Points
FBUS TxO FBUS TxO
MBUS MBUS
FBUS RxO FBUS RxO
VPP
When troubleshooting the flashing to diagnose and determine faulty components, check
the signals in the following sequence:
• Make sure the signals from the tester are making contact with the production
flash pads.
• Use Phoenix to either program or erase a mobile terminal that is not working.
This allows you to monitor the signals form the FPS-8 to the D2800 processor.
• When flashing or erasing the mobile terminal, monitor the MBUSRX and FBUSRX
signals from the UEMEK to the D2800 processor for a signal at these points. If
either signal does not appear, check the signal at the production test points. If
the signal is ok, check the UEMEK. Re-flow or replace the UEMEK.
• Next make sure that the D2800 processor sends information back to the FPS-8
through the FBUSTX signal. If there is no activity at this point re-flow or replace
the processor.
• If all points are ok, make sure the FBUSTX signal goes through the UEMEK by
measuring the signal at the FBUSTXO at production test points. If there is no
signal present, reflow or replace the UEMEK.
• If all signals form the production test points to the UEMEK to the D2800
processor are functioning, it is safe to assume that the UEMEK and D2800
processor are ok.
Continue troubleshooting the D2800 processor as it interfaces with the flash. Verify the
available signal interface between the processor and flash as follows:
• Erase or program the mobile terminal to monitor the D2800 processor and flash
interface as verified earlier using Phoenix External.
• When programming or erasing the mobile terminal, monitor the FLSCSX, FLSCLK,
EXTRDX, and EXTWRX flash signals. If any of these signals has no activity, re-flow
or replace the D2800 processor.
• If all signals are ok, re-flow or replace the flash.
Issue 1 11/2005
Signal voltage Signal voltage
levels are 1.8V levels are 1.8V
UEMEK UEMEK
MBUS Tx MBUS Tx
MBUS Rx MBUS Rx
FBUS Tx FBUS Tx
FBUS Rx FBUS Rx
D2200 D2200
Figure 5: Flashing diagram
©2005 Nokia Corporation
6265/6265i/6268 (RM-66)
Baseband Description and Troubleshooting
Signal voltage Signal voltage
levels are 1.8V levels are 1.8V
D2800 D2800
EXTRDX EXTRDX
FLSCLK FLSCLK
D2800 D2800
Company Confidential
Flash Flash
Memory Memory
FLSCSX FLSCSX
EXTWRD EXTWRD
D3001 D3001
Page 11