Nokia RM-42 Service Manual
Also see for RM-42: Service manual
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Nokia Customer Care Appendix A: RF TroubleshootingA-18Company ConfidentialCopyright © 2005 Nokia. All rights reserved2.7 TX PLL phase lock self test (ST_CDSP_TX_PLL_PHASE_LOCK_TEST)TX_PLL_LOCK_TEST (80) tests the functionality of RX PLL. If this fails also the TX power tests will fail.Tested signals: VBAT_ASIC, VDIG, VR1, VCP2, RFBUSDAT, RFBUSCLK, RFBUSENA, TXRESETXError code for this self test is given in format:• 0xyy, 0xzz,where 0xyy, 0xzz part is the total error code: 0xyyzzVinku PLL not locked(0x0004)ST_CDSP_TX_PLL_PHASE_LOCKERRORYESNOAny other codeYESIt’s not possible toget here …NOIs there RF power at VCOoutput?YESNOIs there supplyvoltage for VCO?YESNOPropable cause:Poor solder/ Faulty Vinku(This should have alreadyfailed in earlier tests)Propable cause:Poor solder/Faulty VCOIs ere RF power at Vinkuinput?thYESNOPropable cause:Poor solder/Faulty balunIs there ENOUGH RF powerat Vinku input?YESNOPropable cause:Balun or VCOIs the Frequency correct ?YES Propable cause:correct freq and Hinku says it’snot locked then change HinkuNOIs the VCP voltage ok?YESNOPropable cause:Poor solder/Faulty RETUOther possible reasons:VCP line shorted to groundPropable cause:Check the loop components/solder joints, if no help, changeVinku. If still not working, changeTX VCOST_CDSP_TX_PLL_PHASE_LOCK_TESTYESNOAny other codeYESNOYESNOYESNOYESNOYESNOYESNOYESNOVinku PLL not locked(0x0004)It’s not possible to gethere…I there RF power atVCO output?I there RF power atVinku input?Is there ENOUGH RFpower at Vinku input?he TX VCO frequencycorrect?Is the VCP2 voltage ok?there supplyvoltage for VCO?(VINKU VREG2)Propable cause:Poor solder/Faulty VinkuOther possible reasons:Is(This should have alreadyfailed in earlier tests)Propable cause:Balun or VCOPropable cause:Poor solder/Faulty VCOPropable cause:Test problemRFBUS failure (but thisshould be ok if we’vegotten this far)Propable cause:Poor solder/Faulty balunPropable cause:Correct frequency and Hinkusays it’s not locked thenchange HinkuPropable cause:Check the loopcomponents/solder joints, ifno help, change Vinku. Ifstill not working, change TXVCO.Propable cause:Poor solder/Faulty RETUOther possible reasons:VCP line shorted togroundIs tss |
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