Nokia NPC-1 Series Troubleshooting Instructions page 9

PAMS Technical Documentation
Check 19.44MHz
RF-clock from C420
OK
Check that purx
goes up to 1.8V
OK
Measure
J406. Should
be 1.08 MHz
OK
Change UPP
(D400)
Issue 1 10/01
Figure 2: Fault tree, phone does not power up
Try to start phone to
test or local mode
FAIL
Measure
Vflash1,Vana,Vio,Vcore
OK
,VR3when pwr key
pressed
VANA & VR3
missing
Check G790
(missing,
misaligned)
Check
FAIL
C420
OK
Check
19.44MHz from
G790
OK
Change N801
FAIL
FAIL
Re-flash phone
Programmng ok,
but phone doesn't
start
ãNokia Corporation
Troubleshooting Instructions
OK
FAIL
OK
Check
FAIL
R792,C792,
C793
OK
Change
G790
Programming
fails
Go to flash failure
chart
NPC-1
Check the
power key
OK
Check R202,
R205, C217,
C220
OK
Check X101
FAIL
Measure VBAT
from C261
OK
Change the
UEM (D200)
Page 9