Kenwood NX-220 K Service Manual

Also see for NEXEDGE NX-220: Instruction manual Instruction manual Instruction manual Service manual Instruction manual

NX-22032Fault Diagnosis of the BGA (Ball Grid Array) IC■ OverviewA flowchart for determining whether or not the transceiver can be powered on (the LCD does not function even if the powerswitch is turned on) due to broken BGA parts.■ BGA partsASIC (IC610), DSP (IC603), FLASH (IC601), SRAM (IC605)When the BGA IC is problematic, please bring the printed circuit board (X57-8040-11) in for service. Various ESN/default ad-justment values are written on the printed circuit board for service.Additionally various ESN stickers are included. (Please refer to pages 33 and 34.)After the printed circuit board has been readjusted, please attach any ESN stickers to the chassis. When “ESN Validation” isused with Trunking, you must modify the ESN register.TROUBLE SHOOTING● Checking power supply voltageChecking voltagePoints to be checked Normal voltage33M IC502 (3 pin) 3.3V15M IC503 (4 pin) 1.5V33A IC501 (3 pin) 3.3VPower supply of each device is connected through the coil.[ASIC]33M: L616, 15M: L615, 33A: L614[DSP]33M: L611, 15M: R665[FLASH]33M: L607[SRAM]33M: L609● Checking the clockChecking the clockPoints to be checked Normal voltage (3.3V)18.432MHz ASIC side R628 18.432MHzDSP side R629 18.432MHzWhen a normalvalue is confirmed.When a normalvalue is confirmed.● Checking the Reset/Control signalChecking the control signal input to the ASICPoints to be checked Normal voltageRESET IC607 (4 pin) 3.3V/BINT Q507 (6 pin) 3.3V/PSW Q506 (3 pin) 3.3VChecking the control signal output from the ASICPoints to be checked Normal voltage/FRST C655 3.3VIf the /FRST is always 0V, the ASIC is broken.If the /FRST repeats 3.3V and 0V at intervals,The ASIC, FLASH and SRAM may be broken.The BGA parts are not broken.Checking for an abnormal point33M has an abnormal voltage.[ASIC]Remove L616 to check the voltage of the 33M.If the voltage becomes normal, the ASIC is broken.[DSP]Remove L611 to check the voltage of the 33M.If the voltage becomes normal, the DSP is broken.[FLASH]Remove L607 to check the voltage of the 33M.If the voltage becomes normal, the FLASH is broken.[SRAM]Remove L609 to check the voltage of the 33M.If the voltage becomes normal, the SRAM is broken.15M has an abnormal voltage.[ASIC]Remove L615 to check the voltage of the 15M.If the voltage becomes normal, the ASIC is broken.[DSP]Remove R665 to check the voltage of the 15M.If the voltage becomes normal, the DSP is broken.33A has an abnormal voltage.[ASIC]Remove L614 to check the voltage of the 33A.If the voltage becomes normal, the ASIC is broken.If the voltage is not corrected, there is a problemother than the BGA parts.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.● Checking the output signalfrom the ASICPoints to be checked Normal voltageSBC R544 3.3VWhen an abnormalvalue is confirmed.When a normalvalue is confirmed.Points to be checked Normal voltage/DRST R604 3.3V If the /DRST is 0V, the ASIC/FLASH/SRAM are broken.Remove R544, Q502 and R518. If the ASIC side is 0V,the ASIC/FLASH/SRAM may be broken.When a normalvalue is confirmed.When an abnormalvalue is confirmed.