JRC JSS-296 Service Manual page 212

1.5 Replace the ROM.
1.6 Return them in a reverse order.
2. Update
The NDZ-127J operates on RAM program, so update the RAM program by copying
ROM program as follows.
2.1 Turn on the NDZ-127J.
Turn on the "AC" switch of the NAH-692/695/698.
2.2 To finish the program of NDZ-127J, input as follows from the keyboard.
Alt + X
(*) After the input, the mode becomes the MS-DOS, and the current drive becomes C:.
2.3 To update the program, input as follows from the keyboard.
U , P ,
2.4 Finish the update.
Updating is finished.
Turn on the power of the NAH-692/695/698 and restart the NDZ-127J.
D , A , T , E , then ENT .
Replace the ROM of the U28.
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