Nokia NHL-2NA Series Troubleshooting Instructions page 60

NHL-2NA
BT Failure
Part III
(BER Failure)
Check VCC
(Pins 52, 53, 54)
with O-scope
Does VCC =
2.95 - 5.2
VDC?
Yes
No
Does Ripple
Voltage
< = 400mVpp?
Yes
Check VREG
(Pin 6)
with O-scope
Does VREG =
2.7 - 3.3 VDC?
Yes
No
Does Ripple
Voltage
< = 30mVpp?
Yes
Page 54
No
Check
VBAT / L430 /
C431
No
Check
VFLASH1 / L431
¤Nokia Corporation
CCS Technical Documentation
Check SYSCLCK
(Pin 50 )
with O-scope
Does Vin =
300-900mVpp?
Yes
No
Does Freq. =
26MHz?
Yes
Can you make
Is BER < =
a connection to Yes
0.1%?
BT Box?
No
1) Replace
BT MCM
2) Flash Phone
BT OK!
using 'BT ONLY'
No
Check
VCTCXO
Buffer Section
1) Replace
BT MCM
No 2) Flash Phone
using 'BT ONLY'
Yes
Issue 1 07/02