User Guide

PAMS
Technical Documentation
NSE–8/9
Troubleshooting
Page 10
Issue 1 07/99
A
External RAM fault?
ID problem?
MCU FLASH Vpp
Error
No
NO
Unknown fault. Check for noise on
communication lines
Try phone totally dead.
No
Check pins of SRAM (D302)
Check control lines of SRAM:”MEMC(4:0)”
Yes
Check type of FLASH
Check soldering of FLASH
Yes
Check
– that Vpp is not shorted by
R307 or C304.
– connection from R307 to
X201 pin 10
– Check Vpp
– Vbb=2.8V
– Vpp=12V +/– 5%
– Noise on MBUS/FBUS
lines
Yes
Flashing from
X201?
Check connection from
J105 to R307
Voltage at
R307 >1.7V & <3.6V
during flashing?
YesNo
Defect FLASH or
flashing–SW has wrong
version.
Yes
No
Voltage at R307 12V +/–
5% during flashing?
No
Vpp outside supported
range.
Yes
Figure 4–5