Kenwood NX-210 Service Manual

Also see for NEXEDGE NX-210: Function reference Instruction manual Instruction manual Specification Instruction manual

NX-21034TROUBLE SHOOTING● Checking the output signalfrom the ASICPoints to be checked Normal voltageSBC R218 3.3VWhen an abnormalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.● The LCD displays controlIt is unlikely that the BGA parts are broken.Points to be checked Normal voltage/CS4 IC104 (7 pin) 3.3V→0V→3.3VPoints to be checked Normal voltage/DRST C335 3.3VPoints to be checked Normal voltage5A IC205 (5 pin) 5.0V If 5A is 0V, parts other than the BGA are broken.If the /CS4 is 0V or 3.3V, the ASIC/FLASH/SRAMmay be broken.If the /DRST is 0V, the ASIC/FLASH/SRAM are broken.Remove R218. If the ASIC side is 0V,the ASIC/FLASH/SRAM may be broken.Points to be checked Normal voltage/LCDRST R25 3.3VRemove R25. If the ASIC side is 0V,the ASIC/FLASH/SRAM may be broken.When a normalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.● When an error display appears on the LCD.The LCD displays “INIT ERROR1”. An error occurs when the ASIC internal RAM readsor writes. The ASIC may be broken.The LCD displays “INIT ERROR2”. An error occurs when the DSP internal RAM readsor writes. The DSP may be broken.The LCD displays “INIT ERROR3”. An error occurs when the SRAM internal RAMreads or writes. The SRAM may be broken.■ Descriptions of signal names1) RST(RESET) : ASIC reset signal LOW → Reset2) /BINT : Battery final voltage monitoring LOW → Final voltage3) /PSW : Power switch signal LOW → ON4) /FRST : FLASH reset signal LOW → Reset5) SBC : Switch B control HIGH → ON6) /DRST : DSP reset signal LOW → Reset7) /LCDRST : LCD reset signal LOW → Reset8) /CS4 : LCD controller chip select signal LOW → Active9) 5A : Analog peripheral control 5.0V power supply