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12 Write to EE-prom
12.1 What is "Write to EE-prom"
Large amount of data is stored in the RAM memory of the phone during the radio calibration in
EFRA.
This information is stored permanently in a 16 kb large EE-prom after interpolation.
This is done at three occasions, Write Powertable to EE, Write RRS Table to EE and Write
Local Table to EE, stores the parameters of the calibration of the IQ-filter.
The data transfer is done serially at an I
I2CDAT for data and I2CCLK for clocking. (The I
The figure below Fig. 12.1. shows a schematic over the data transfer.
12.2 How to find the fault
There is a possibility, in the trouble shooting part of EFRA, to test the communication and a
limited part of the function in the self-test.
The functionality test that is done is the processor writing and reading at a few addresses.
If the self-test shows "Check EE Prom Failed", the phone is faulty, but the self-test does not
display all faults, so there is a possibility for the self-test not to detect the fault.
Open the phone and check for liquid damages.
No further action should be taken for a liquid damaged telephone.
Check the soldering at D600 pin 3, 4. Check R619, R620.
Make sure there is not a short circuit against ground at I2CCLK or I2CDAT.
Give the board power and check VDIG +3.2 V
Sometimes replacing D600 can make it.
4/00021-3/FEA 209 544/18 B
2
2
C-bus, Inter IC. The I
2
C -bus also goes to the display).
Fig. 12.1
.
DC
Trouble Shooting Guide, Advanced
C-bus consists off two lines,
55(121)
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