User Guide

PAMS
Technical Documentation
NSE–8/9
Troubleshooting
Page 11
Issue 1 07/99
4.3. Power doesn’t stay on or phone is jammed
If this kind of fault has come after flash programming, there are most probably open
pins in ICs. The soldered joints of ICs: D300 (MAD2Pr1), D301 (FLASH), N100
(CCONT), D302 (SRAM) are useful to check at first.
Normally the power will be switched off by CCONT (N100) after 32 seconds, if the
watchdog of the CCONT can not be served by software.
Check watchdog is updated. Check that PWRON (at R413) is high and that
CCONTCSX (J337) toggles. In the normal case there is a short burst of pulses every
8 seconds.
The power off function of CCONT can be prevented by connecting a short circuit
wire from R424 to ground (Watchdog disabled).