Compuprint 9070 - Manual (Page 101)

96
Quiet Printing
PERFOR. SAFE NO
↑
QUIET PRINT OFF → or ←
QUIET PRINT ON → or ←
↓
AUTOGAP 0
QUIET PRINT OFF
The function is disabled. Printing at normal noise level.
QUIET PRINT ON
The function is enabled. Printing at reduced noise level.