Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
11(78)
3.3 Read EEPROM
Go to Startup/Read EEPROM.
Fig. 3.2
The DAC-value of the VCXO gives a TX-frequency at 1773.2 MHz.
The DAC-value of the TxVCO is used to pre-load the TXVCO-loop filter.
D, E and F Word are default value for Homeros (N300), that are stored in the EEPROM.
If it is impossible to read from EEPROM:
Open the phone and check for liquid damage.
Check the system connector.
Check R801, R802.
Make sure there is not a short circuit against ground at I
2
CCLK or I
2
CDAT.
Power up the board and check VDIG.
The fault is usually due to D602.
The values shown in the menu are different for all stations.
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