Service manual

3 • Theory Of Operation

3-12 DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)

Sensor Inputs. The transport is equipped with five sensors in the case of

the DM400c, and three in the case of the mailing machine. See Figure 3-10

below for a diagram of the transport layout.

Autofeeder. FS1 (Feeder Sensor 1) is the stack present sensor. FS2

is a lead edge/trail edge sensor, the input of which helps the system de-

termine envelope length. It also serves as a fail-to-feed detector in the

event that a mailpiece fails to reach FS2 within a predetermined time.

See Figure 3-11 for the location of the autofeeder sensors.

#10 (241.3[mm]=9.5[inch])

#10 Envelope

Input Roller

Output Roller

PS1

PS2

PS3

FS2

Head

PrinterFeeder

609.6[mm/sec]

FS1

500[mm/sec]

300[mm/sec]

Tape

Separate Roller

Figure 3-10 DM300c/DM400c Transport Layout

3.4 Envelope/

Tape Transport

Sequence of Operation (cont’d)

Mailing Machine. Sensor PS1 (Printer Sensor 1) is the lead edge sen-

sor (see Figure 3-12). It detects the lead edge of the mailpiece and

initiates movement of the print carriage assembly from the home to the

print position. (The carriage is home when the carriage home sensor is

blocked).