Ricoh C226 Service Manual page 68

ENLTRIG
ENL
Pulse width
The thermal head energy is controled by changing pulse width.
The pulse is controlled by the ENL signal from the main board corresponding
to ENLTRIG.
Thermal head voltage (VHD: 19 V ~ 24 V) is applied from PSU only during
the master making process. This is controlled by the VHDON\ signal from
the main board.
SM
VHDON\
0 V
5 V
2-19
OPTICS/IMAGE PROCESSING
VHD
19 ~ 24 V
0 V
C226