Need help on NEC UPD75268CW program transfer

[jamestien]

Hello Everyone,

I have an old Kenwood amplifier which uses NEC UPD75268CW as VFD driver and system control, unfortunately it has internal shorted circuit which caused erratic VDF display.
According to document its a 4bit single microcomputer chip with 64pins, has custom (Kenwood) program in it. I already bought a new blank chip, and now is seeking for any help on how can I read firmware from the old IC and transfer to the blank IC in order to make it work again.
I've had experience with IC firmware download & upload using some programmer, but just cant find any useful guide on this NEC chip.

Any help on how to, or firmware transfer service would be appreciated, thank you in advance!

[coromonadalix]

for that kind of problem   you have to order the part at kenwood, they are supposed to sell it programmed to your equipment  ??

not the response you would like,  but send them an email  or try to find a service center ...

[jamestien]

Thank you for the advice, I'm afraid if Kenwood can accommodate the request since the amplifier is from early 90's. But I will try.