Service manual

EPSON LX-300+ Revision A
Operating Principles Printer Mechanism (M-3M10) 50
2.2.5 Paper Feed Mechanism
This mechanism consists of paper feed motor (PF motor), paper feed gears,
platen, rear paper end detector, bottom paper end detector and push tractor
unit. (Refer to Figure 2-2, "Printer Mechanism Block Diagram")

Paper Feed Method
 Friction feed
 Push tractor feed
Uses standard push tractor
 Push-pull tractor feed
Uses standard push tractor + Option tractor
 Pull tractor feed
Replace the standard push tractor with option tractor
 Feeder
 Simple CSF (option)
 Tractor (standard)
Push / Pull
 Pull tractor (option)
 Roll paper holder
 Paper path
 Manual loading
Rear paper load, top paper load
 CSF
Rear paper load, top paper load
 Push tractor
Rear paper load, top paper load
 Pull tractor
Rear / Bottom paper load, top paper load

Auto loading
When loading paper manually, push paper between the platen and
the driven paper load roller. Paper will be loaded automatically.
PF MOTOR
LX-300+ uses the stepping motor for PF motor. Open loop control switches
the phase according to the
LX-300+ uses stepping motor for PF motor. Open loop control switches the
phases according to the setting period and this mechanism loads and carries
paper to the appointed position and eject paper.
The table below is the PF motor specifications.
Table 2-10. PF Motor Specifications
Item Specification
Motor type 2-phase/96-pole Hybrid stepping motor
Coil resistance 16.0
Ω
±10% (25°C, per 1 phase)
Control method bi-polar rated current drive
Phase drive 1-2 phase, W1-2 phase
Drive voltage
36.75 ± 1.75 VDC
(This voltage is added to driver.)
Drive current 0.1 to 0.9A
Paper feed pitch
Minimum Resolution:
0.059 mm (1/432”) (1-2 phase, 2 pass)