User Guide

Nokia Customer Care RF Description and Troubleshooting
6255/6255i/6256/6256i (RM-19)
Issue 2 05/2005 ©2005 Nokia Corporation Company Confidential Page 77
Bluetooth Troubleshooting Flowchart
Bluetooth
Is the VREG_IN BT
external supply
voltage 2.8V?
Replace the R6002.
Is it OK?
Replace the BT ASIC
(N6000).
YES
NO
YES
Replace the EXT
regulator. Is it OK?
Is the VIO bluetooth
external supply
voltage 1.8V? (Probe
at the UEM side.)
Replace the C6002
and R6001 buffer
discretes. Is it OK?
Is the VDD_ANA
voltage regulator
output 1.8V?
Is the XTAL_IN
450mVpp, 19MHz,
1.3Vdc?
Are the TX_A and
TX_B power levels
each -15dBm?
NO
YES
YES
NO
NO
Replace the L6000,
L6001, and C6000
filter discretes. Is it
OK?
NO
YES
Is the SAW filter
output power level -
18dBm? (Probe at
the bluetooth
antenna.)
Replace the SAW
filter. Is it OK?
NO
NO
NO
NO
NO
NO
Replace the digital
inverter. Is it OK?
NO