User Guide

PAMS
Technical Documentation
NSE–6
Disassembly & Troubleshooting Instructions
Page 7
Original 08/98
Phone is totally dead
This means that the phone doesn’t take current at all when the power
switch is pressed or when the watchdog disable pin (X001 pin 11, J111) is
grounded. Used battery voltage must be higher than 3.1 V. Otherwise the
hardware of CCONT (N100) prevents totally power switch–on.
Phone is totally dead
J232 VBAT is 3.6 V
WDDIS (J111)) is
0V, when PWR switch
is pressed
VBB 2.8 V (R115, C107..)
VXO 2.8 V (C149..)
When PWR switch is pressed or
WDDIS is grounded (J111)
Failure in VBAT line
Check L103
Voltage at J111 is 3.6V
Faulty CCONT (N100)
See section ”Power doesn’t stay on”
Check PWR switch
to CCONT line: R341,
R118
Faulty CCONT (N100)
Yes
No
Yes
Yes
Yes
No
No
No
Yes
Flash programming doesn’t work
The flash programming can be done via panel connector X001 or via ded-
icated PCB pads. In production, the first programming is done via panel
connector. After this, the panel connector is cut away, thus the program-
ming must be done via PCB pads visible through the shield under the bat-
tery. The main difference between these is that FLASH programming volt-
age is produced differently.
In flash programming error cases the flash prommer can give some in-
formation about a fault. The fault information messages could be:
– MCU doesn’t boot
– Serial clock line failure
– Serial data line failure
– External RAM fault
– Algorithm file or alias ID don’t find
– MCU flash Vpp error