Nokia 3210 Service & Repair Manual
Also see for 3210: User guideRepair guideUser guideUser guideManual
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Contents
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CONFIDENTIAL Service & Analysis Center EuropeTraining Teamversion 1.0 / 05.11.1999 Page 34 of 37The pictures indicate a typically case of broken solder ballunder the μBGA. On the right you can see the little part of theCOBBA IC view with a microscope. The PCB is on thetop, and the COBBA are with the body to the bottom ofthe picture. The picture below shows a broken ball viewthrough a X-ray machineNo TX-Power or to lowSee also the troubleshooting chapter 4.GSM transmitter and 5. PCN transmitter from service manualZ500 Duplexer Filter (Low TX-Power on GSM 900)• Check the TX-Power level between the TX "in" and "Antenna" pad of the duplexer• Resolder the ground and signal connection pads of the duplexer• Change the duplexerZ504 RX/TX switch GSM1800 (Low TX-Power on GSM 1800)• Check the 1V DC TX-switching voltage on Z504• Check the TX-power difference between "TX" and "ANT" pad on Z504• Change the Z504 if more than 2dBm difference are measurableN500 /N501 Power Amplifier GSM 900 /GSM 1800• Check the power supply VDC_OUT(3,2V→4,2V dependent to the power level) N500 /N501 pin 3• Check the input power on pin N500/ N501 depend of the band (nominal 0dbm)• Check the outgoing power on pin 4 N500/ N501• Check the TX-Power control signal on pin 2 N500/ N501 , 0,7Vpp-1,7Vpp / 0,12..V - 0,2..V DC dependent of thepower-level (see the diagram below)• Change the PA if no power or to low power comes out and the power supply and control line are OK |
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