Dear All,

can any one help me to solve the following problem:

Machine: Hitachi seiki
Controller: Fanuc 6T
Memory: bubble memory BMU

Alarm 904 appears some times and some times not, i tried to initialize the bubble memory by pressing (-) and (.) while powering on and the following happened:

the screen shows just 3 options as

IL-Mode
1-tape
2-memory
3-enpane
I can not see the rest of the options:
4- bubble
5-PC-Load
6-RAM

could any one help
Sting