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3 • Theory Of Operation
3.4 Envelope/
Tape Transport
TIP: As noted earlier,
DM400c to DM475C
software does not re-
port skew conditions; it
reports jams or no pa-
per conditions.
Sequence of Operation (cont'd)
NOTE: If sensor PS1 does
not detect a lead edge
within 15 seconds, the
print carriage returns to the
home position.
2. When the print carriage
is in the print position, the
transport motors start and
one piece is separated
from the stack.
The autofeeder transport
operates at a slightly
slower maximum speed
than the mailing machine
transport (23.5 ips as op-
posed to 24 ips) to prevent
collisions at the mailing
machine entrance.
If a mailpiece fails to reach
FS2 within a predetermined
time, the system logic de-
clares a feed error.
3. 3C00 ONLY: Sensors PS2
and PS3 detect skew.
Likewise, if PS1 and PS2
are blocked, and PS3 does
not sense the lead edge of
the piece within a prede-
termined period of time, a
skew condition is declared
and the system logic pre-
vents the meter debit pro-
All Models: If PS1 is
blocked and PS3 does not
see the lead edge of the
piece within a predeter-
mined time, a fault is de-
clared. If no fault condition
is detected and PS1 and PS3 are blocked, PS3 triggers the meter debit
process. When PS3 triggers, the required postal funds are spent. As
shown in Figure 3-17, the system logic allows a time window of 110/120
msec or roughly three inches of paper travel for the debit process to
complete successfully. If it fails, the meter is not debited, printing is in-
hibited and a fault declared.
Figure 3-13 Auto Feeder Distance Encoder
Figure 3-14 Mailing Machine Distance Encoder
and Sensor Board
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)



This manual also for:

Dm400c, Dm475, Dm450c

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