HP 220240 - Manual (Page 66)

1. Check to be sure the printer has stopped printing and the message
display reads 00 READY.
2. Press the test button on the right side of the printer with a ballpoint
pen.
— The printer enters the offline state.
— The Alarm indicator lights while the page is printing.
— The display reads 15 ENGINE TEST while the page is printing.
— The printer remains in the offline state and the display reads
00 READY.
MLO-004894 (Figure 2-37; 19 picas)
3. Press
On Line
to place the printer back on line.
Operating Information 2–39