About replace the microprocessor with a new one.
[A]: Mask ROM (With software). No need to write in of software to the microprocessor.
[B]: Flash ROM (With software). Usually no need write in software. But when the software was updated, you should write in of the new software to the microprocessor or flash ROM. Please check the software version.
[C]: empty Flash ROM (Without software). You should write in the software to the microprocessor or flash ROM.
Update procedure [Writing main microprocessor procedure.]
IC300 [MB90F352PFM-G ST-15S1 FOR N]
Necessary equipment
Windows PC [O/S: windows 2000 or Windows XP with serial port.
RS-232C cable straight type [9 pin male – 9 pin female]
Connection JIG: ST-7001 DAB/MICOM UPGRADE BOARD [90M-ST7001JIG]
Writing software [flashprog 1 6lx-v01/11.exe]
Writng data [Marantz_DABxxxx.mhx]. Note: xx is version number
Install procedure.Double click flashprog16lx-v01/11.exe
* Click "Yes"
* Click Next
* Check complete, and click next
* Click install
* The status bar appears; click Next
Writing Procedure
* Disconnect the mains cord from the unit.
* Connect RS 232C on the connection JIG and Serial Port of windows PC with RS-232C cable.
* Turn the Mode Selector switch [SW401] of connection JIG to the MICOM UPGRADE side.
* Connect the connection JIG to SERVICE PORT in the rear panel of the unit.
* Connect the mains cord to the unit.
* Press the Power On/Off button, on the unit. Launch up the FUJITSU Flash MCU programmer (FMC16LX)
* Click Start > Programs> FUJITSU FLASH MCU programmer & FMC16lx.
* Click 'Set Environment"
* Choose the using serial port and click OK.
* Choose MB90F352C/S/CS in Target Micro-controller.
* Select writing data and click Open.
* Click 'Full operation [D+E+B+P]
* Click OK.
* Close the FUJITSU MCU Programmer.
* Disconnect mains cord from the unit.
* Disconnect JIG from the unit.
* Check version [Refer to Service mode BY Previous Post Here]