Troubleshooting Diagram Of The Post-Code - Nokia 9000i Service Manual

After Sales
Technical Documentation
1.7.3 Activity in CPU TxD0?
If the CPU receives the pings, then it should send acknowledgements
through the RS–buffer to the service software. If the RSTXD line is not
toggling, but the RSRXD is, then proceed to 1.7.1.1 If the RSTXD line is
toggling but the TXD is not, then go to 1.7.2.1
2 Troubleshooting Diagram of the POST–Code
If the communications channel between the PDA and the service software
can be established, the last checkpoint passed during POST can be
retrieved from the PDA. The list of the POST–codes is in appendix B.
2 .1 Read POST Checkpoint
In order to read the POST checkpoint, choose the Get POST Checkpoint
menu in the PC Locals.
2 .2 POST–code OK?
If the checkpoint is right, i.e. equal to the one last in the list, the POST has
completed successfully, and there are no bad errors in the internal parts of
the CPU and none in the DRAM. If the checkpoint differs from the one
that is expected, then refer to the checkpoint list. The possible errors can
be divided mainly into two groups; CPU–, and DRAM–related errors.
Original, 05/97
0.
Start
1. Read POST
checkpoint
2.
NO
POST–code
OK
YES
POST Code
OK
Faultfinding/Disassembly
Refer to the
Checkpoint list
RAE/RAK–1N
Page 8 – 23