Service manual

EPSON Stylus C82 Revision A
OPERATING PRINCIPLES Overview 17
2.1 Overview
This section describes the operating principles of the printer mechanism and electrical
circuit boards
2.1.1 Printer Mechanism

The basic component of the printer mechanism is same the Stylus C80/C70.

Only the ASF is newly designed.

For throughput improvement, the special use Flashing Box utilizes 0/80 digit bi-
direction.

Paper can be supplied by 0/80 digit bi-direction. (Economy printing only.)
2.1.2 Carriage Motor Specification
2.1.3 Paper Feeding Motor Specification
2.1.4 Paper Loading Mechanism (New ASF unit)
The ASF of this printer is newly designed. It has the following characteristics.

Uses a Retard Roller. (Laser printers also use this roller.)

New design of PF/ASF change mechanism. (Operating principle same as
previous.)
2.1.4.1 Drive Process
1. The motion of the PF Motor is always transmitted to the Combination Gear
Ratchet 65.6 but not transmitted to the LD Roller.
2. After receiving the paper feed command, the Carriage Unit contacts the A or B
ASF Trigger Lever.
3. At this point, the Change Lever extends in the direction of arrow C, locking the
Clutch mechanism.
4. The motion of Combination Gear Ratchet 65.6 is transferred to Clutch Gear 1.
5. LD Roller Gear 2 rotates one time (LD Roller rotates once), and then the LD
Roller is stopped by the Clutch Gear again contacting the Change Lever.
Figure 2-1. Drive Process
Table 2-1. CR motor Specification
Items Specifications
Type DC motor with brushes
Drive voltage +42V ± 5% (voltage applied to driver)
Coil resistance 27.1Ω ± 10% (per phase at 25 degree)
Inductance
19.8mH ± 25% (1KH 1VmA)
Drive method PWM, constant-current chopping
Driver IC LB11947
Table 2-2. PF motor Specification
Items Specifications
Type DC motor with brushes
Drive voltage +42V ± 5% (voltage applied to driver)
Coil resistance 22.3Ω ± 25% (per phase at 25 degree)
Inductance 17.3mH ± 25% (1KH 1VmA)
Drive method PWM
Driver IC LB11947
Combination gear ratchet 65.6
Retard roller
A
2
1
B
C
ASF trigger lever
Change lever
LD roller