Ricoh C211 Service Manual page 251

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 from the image processing board.
VHD
CNT
CN104-33
Main Board
Thermal head voltage (VHD: 19V~24V) is applied from PSU only during the
master making process. This is controlled by the VHDCNT signal
(CN104-33) from the main board.
VHDCNT
C216
Thermal
CN504-1
Head
Voltage
Circuit
PSU
(CN104-33)
0 V
5 V
2-5
VHD
CN505-1
VHD
CN505-3
GND
CN505-4
GND
CN505-5
VHD (CN505-1)
(CN505-3)
19~24 V
0 V
CN701-1
CN701-2
CN701-3
CN701-4
Thermal Head
SM