Vdcdca (Vlow) Level; Rf Tuning And Testing; Rf Auto Tuning And Testing With Nokia Care Suite; Rf Auto Tuning Procedure - Nokia 300 Service Manual

RM-781
Cellular RF troubleshooting
The GSM or WCDMA transmitter (or receiver) has to be activated before the Vref supply voltage can be
measured. Follow the instructions given in chapter 'Manual transmitter (TX) testing with Phoenix → GSM
transmitter activation' or 'WCDMA transmitter activation'.

VDCDCA (Vlow) level

Check the VDCDCA level (1.5 V) at C7528.
The WCDMA transmitter has to be activated before the VDCDCA supply voltage can be measured. Follow the
instructions given in chapter 'Manual transmitter (TX) testing with Phoenix → 'WCDMA transmitter activation'.
Note: The VDCDCA signal is continuously on when WCDMA TX is activated.

RF tuning and testing

RF auto tuning and testing with Nokia Care Suite

Introduction to cellular RF tunings
The cellular RF engine has been tuned correctly in production. There is no reason to do re-calibration unless
one or more of the RF components are changed or memory (D3000) is corrupted.
The device can be tuned automatically. Auto tuning is designed to align the phone's RF part easily and faster.
It performs calibrations, tunings and measurements of RX and TX. The results are displayed and logged in a
result file, if initiated.
Note: Always perform RF tuning with the help of the module jig, never with RF couplers. Using an
RF coupler in the tuning phase will cause a complete mistuning of the RF part.
Important:
Cable and adapter losses
RF cables and adapters have some losses. They have to be taken into account when the phone is tuned. As
all the RF losses are frequency dependent, the user has to act very carefully and understand the measurement
setup. For RF attenuations of the RF cable, please refer to section 'Service Tools and Service Concepts'.
Hardware set up
For hardware requirements for auto tuning, please refer to
jig in section 'Service Tools and Service Concepts'. Please make sure that cellular RF connectors for Low-Band
and High-Band are always both connected before voltage is applied to the phone.
Nokia Care Suite preparations
Install Testing And Tuning Tool add-on application to Nokia Care Suite. Automatic RF testing and tuning is
not possible without this application. There is no more support in Phoenix to auto tune RM-781 product.
Install the phone specific data package. This defines phone specific settings.

RF auto tuning procedure

Note: If RF splitter is in use, skip steps 10, 11 and 12.
1 Make sure the phone (in the module jig) is connected to the PC.
2 In any case, connect both low and high band cables. Both cellular RF-connectors (LB and HB) have to be
connected to the phone before boot–up/power-on. (No matter if a RF-Splitter is used or not.)
Nokia Care Suite application. The following window opens:
3 Start
Issue 1
After RF component changes, always perform cellular RF auto tuning.
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RF testing and BB/RF tuning concept with module
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