Recommendation For Repair Actions In The Rf- Area; Low Receiver Signal Strength Indicator; No Service - Nokia 3210 Service & Repair Manual

Recommendation for repair actions in the RF- area

To prevent some additional faults please take care of following recommendations for repairing the RF-area
Don't use so much flux that it will go through the board and soiled the keyboard area
Clean after every repair time the rest of the flux from PCB
Don't make any loose wiring connection on the board
To change some components it is necessary to remove the shield from the PCB, use matching nozzles for the
solder machine. Don't cut it partially and solder the "old" part back or make some unqualified work
Use a new shield after removing

Low receiver signal strength indicator

Antenna faulty / wrong - Tuning
Check the fixed position of the antenna,
Check the antenna spring connector X501, change it if bent
Check the receiver signal indicator with a new antenna
Retune the handset

No Service

Set first the RF-Generator to a high RF-Level output e.g. –40dBm
Set the module with wintesla as follow mode: Initialise/ Local mode/ Testing/ RF Controls.../ Active unit "RX"/
Operation Mode "continuous"
13MHz VCTCXO G701 out of range
Check the 13MHz reference frequency pin 15 N700 (SUMMA) or pin 2 of G750, a frequency error
higher +-50Hz can create deviation of the Intermediate frequencies
View also SB 18 "The old version 'A' VCTCXO (type number: NGK3092A) should be replaced with a new version 'B'
VCTCXO (type number: NGK3092B)"
No RX (no Rx calibration...RSSI reading highest value)
N600 CRFU / faulty / poor soldering
Check the incoming RF- Channel frequency on pin 27 N600
Check the LNA_AGC voltage 2,8V DC pin 28 N600
Check the VRX_1 voltage 2,8V pin 15,16,23, 33, 38,45,46 N600
Check the LNA_OUT frequency pin 23 N600 and input on pin 18, 19.
An attenuation from aprox. 10-15dBm between signal input and output is normal!
Check the UHF LO frequency
No frequency deviations are allowed!
Check the outgoing 71MHz Intermediate Frequency on pin 15, 16 N600
Check the soldering of N600 or change it
Z700 / faulty / poor soldering
Check the 71MHz IF frequency on Z700. The normal attenuation between input and output are 15dBm
Check the components C701, C704,C149, L701, R701 if the signal amplitude is different between the two lines
check the soldering of Z700 or change it
version 1.0 / 05.11.1999
CONFIDENTIAL
don't touch the conducting area with the fingers
(2036MHz GSM900 CH60)
Service & Analysis Center Europe
pin 3 N600 approx. –20dBm.
Training Team
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