Nokia RM-42 Service Manual
Also see for RM-42: Service manual
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Appendix A: RF Troubleshooting Nokia Customer CareCompany ConfidentialCopyright © 2005 Nokia. All rights reservedA-172.6 RX PLL phase lock self test (ST_CDSP_RX_PLL_PHASE_LOCK_TEST)RX_PLL_LOCK_TEST (79) tests the functionality of RX PLL. If this fails, none of the RX relatedmeasurements cannot be trusted.Tested signals: VBAT_ASIC, VDIG, VR1, VR1RX, VCP1, RFBUSDAT, RFBUSCLK, RFBUSENA, RXRESETXError code for this self test is given in format:• 0xyy, 0xzz,where 0xyy, 0xzz part is the total error code: 0xyyzzHinku PLL not locked(0x0004)ST_CDSP_RX_PLL_PHASE_LOCK_TEERRORSYESNOAny other codeYESPropable cause:Test problemRFBUS failure (but this shouldbe ok if we’ve gotten this far)It’s not possible toget here…NOIs there RF power at VCOoutput?YESNOYESNOPropable cause:Poor solder/ Faulty HinkuOther possible reasons:VCP line shorted to groundPropable cause:Poor solder/Faulty VCOIs RF power at Hinkuin ut?therepYESNOPropable cause:Poor solder/Faulty balunIs ere ENOUGH RF powerat Hinku input?thYESNOIs t e Frequency correct?hYESPropable cause:correct freq and Hinku says it’snot locked then change HinkuNOIs the VCP voltage ok?YESNOPropable cause:Poor solder/Faulty RETUPropable cause:Go through this and this linkif no help thenchange Hinku, if stillnot working change VCOST_CDSP_RX_PLL_PHASE_LOCK_TESTYESNOYESNOYESNOYESNOYESNOYESNOYESNOYESNOHinku PLL not locked(0x0004)Any other code It’s not possible to gethere…Is t ere RF power atVCO output?there RF power atHinku input?there ENOUGH RFpower at Hinku input?I he RX VCO frequencycorrect?Is CP1 voltage ok?Propable cause:Test problemRFBUS failure (but thisshould be ok if we’vethe Vgotten this far)Propable cause:Poor solder/Faulty HinkuOther possible reasons:VCP line shorted to groundPropable cause:Poor solder/Faulty RETUPropable cause:Go through “Areomponents near the RXVCO ok?” and “RX VCOc ntrol voltage VC ok?” linkf no help then changeHinku, if still not workingchange VCO.Propable cause:Correct frequency and Hinkusays it’s not locked thenchange HinkuPropable cause:Poor solder/Faulty balun Propable cause:Poor solder/Faulty VCOthere supply voltage for VCO?If VR1RX is OK then the problem isVCO, otherwise Hinku is faulty. (VR1is routed through Hinku to VCO)Propable cause:Balun or VCOIsoics tIsIsh |
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