Kenwood NX-220 K Service Manual

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

NX-22033TROUBLE SHOOTING■ Descriptions of signal names1) RST(RESET) : ASIC reset signal LOW → Reset2) /BINT : Battery final voltage monitoring LOW → Final voltage3) PSW : Power switch signal HIGH → ON4) /FRST : FLASH reset signal LOW → Reset5) SBC : Switch B control HIGH → ON6) /DRST : DSP reset signal LOW → ResetReplacing TX-RX Unit■ TX-RX unit InformationModel Name Original TX-RX unitNumberFor Service TX-RXunit NumberNX-220 X57-8040-10 X57-8040-11■ Method of confirming “Original TX-RX unit” and“Service TX-RX unit”The 0Ω resistor (R4) is mountedon the “R4” silk print part of theService TX-RX unit (X57-8040-11).X57-804Component sideR4● The LCD displays control *1The LCD does not function even if it is exchanged with the Display unit. *1It is unlikely that the BGA parts are broken.Points to be checked Normal voltage/LCDCS R667 3.3V→0V→3.3VIf the /LCDCS is 0V or 3.3V, the ASIC/FLASH/SRAMmay be broken.When a normalvalue is confirmed.When an abnormalvalue is confirmed.● When an error display appears on the LCD *1The LCD displays “ERR 1”. An error occurs when the ASIC internal RAM readsor writes. The ASIC may be broken.The LCD displays “ERR 2”. An error occurs when the DSP internal RAM readsor writes. The DSP may be broken.The LCD displays “ERR 3”. An error occurs when the SRAM internal RAM readsor writes. The SRAM may be broken.● When the LED color changes red and orange alternately *2*1: K2,K3,E and E2 models only*2: K and E3 models onlyA warning tone sounds The frequency data was not written.(Unprogramming)A warning tone does not sound An error occurs when the ASIC internal RAM readsor writes. The ASIC may be broken.An error occurs when the DSP internal RAM readsor writes. The DSP may be broken.An error occurs when the SRAM internal RAM readsor writes. The SRAM may be broken.oror