Service manual

3 • Theory Of Operation
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
3-15
89 89 100 63.5 113 93
6.5 704
5118 2
57.5
105 51
514164
63
33
PS2 PS2PS1
PS3
Tape Feeder
Encoder
Moistener
Encoder
PS1
PS3
25
1651 (Pulse/Revolution) Encoder Resolution : 0.088 (mm/pulse)
1651 (Pulse/Revolution) Encoder Resolution : 0.085 (mm/pulse) = 300dpi
0.68 [IPS] (17.2 [mm/sec])
4.48 [IPS] (113.8 [mm/sec])
16 [IPS] (406.4 [mm/sec])
23 [IPS] (584.1 [mm/sec])
23.5 [IPS] (596.6 [mm/sec])
24 [IPS] (609.6 [mm/sec])
Stack Sensor
FS1
Two-channel (quadrature) encoders determine transport motor speed. Encoder failure can cause motors to run at wrong speed and affect gapping.
Start
Debit
120 msec
Runs at
Constant
Velocity
End Debit, Start Printing
FS2
Figure 3-15 Transport Timing Diagram — DM400c/DM450c
3.4 Envelope/
Tape Transport
Sequence of Operation (cont’d)
✍
TIP: See section 3.10
for DM475 differences
and specific theory.