[stevo1]

Hmmm...not sure what happened there. How did you clear these alarms last time. I don't show anything refering to clearing bubble memory. I have another procedure that you can try if you can get back to the "check sum error".

1. Press NC/PC Button to go to PC Side.
2. Sum Check Error Screen press INPUT Button.
3. Press F1 Button to go to Sequence.
4. Press F3 Button to go to Program.
5. Turn Write Enable Switch ON.
6. Press F2 Button to go to Alter.
7. Press F4 STORE and then Press INPUT.
8. Press F6 End.
9. Turn Write Enable Switch OFF.
10. Turn Power OFF. Wait 10 Seconds.
11. Turn Power ON and Error should disappear

Not sure if this is the right procedure for that control. This was something I wrote down years ago and did not label it. You should know right away because the "F" buttons won't match.

Stevo

[1seabee]

The first time I had these alarms, I called in Hitachi service. They pulled the RAM board instead of Bubble board. They also pulled the battery from the RAM board. They sent the board back to me, I installed it, then I got the check sum error. My books say to replace the bubble board for bubble errors.

[1seabee]

O.K. Stevo, here's the deal. Apparently my service guys wiped out my ladder. I see I need YuYu to load it, and I need the ladder. I should be able to get the ladder from service. Any ideas about the YuYu?