Roland Advanced Jet AJ-1000 Service Notes page 218

2. HOW TO REPLACE O RING (HEAD PART)
Remove Right I/S Cover.
1
Remove Carriage Cover.
Turn on Printer Main Power SW.
2
Turn on Sub Power SW while pressing the Left, Right and
3
Down keys to enter Service Mode.
<Rear View>
[ ], [
MENU
SERVICE MENU
5-11
Right I/S Cover
Carriage Cover
Printer Main Power SW
], [ ] + POWER ON
[MENU] key