C293 Main Board Removal - Epson LQ-570e Service Manual

EPSON LQ-570e/LQ-580

4.2.5 C293 MAIN Board Removal

n Before disassembling, assembling or adjusting the printer,
W A R N I N G
disconnect the power supply cable from the AC power socket.
Failure to do it cause personal injury.
n Do not touch the heat sink attached to the switching FET (Q1) on
the power supply board, just after power off as it may be very
hot.
n Never touch the heat sink attaches to the switching FET (Q1)
while at AC power cable is connected to the AC outlet, as it is not
electrically isolated.
1. Remove the paper guide assembly, top cover, front cover, paper eject cover, knob and
tractor unit. (See 4.2.1 "Pre-disassembly Procedures".)
2. Remove the upper housing assembly. (See 4.2.4 "Upper Housing Assembly
Removal".)
3. Remove 7 CBS (3x4, F/ZN) screws and 2 CBP-Tight (3x12, F/ZN) screws securing the
shield plate to the rear frame and power supply board assembly and remove the shield
plate.
2 CBP-Tight (3x12, F/ZN) Screws
Figure 4-9. Shield Plate Removal
Disassembly and Assembly
7 CBS (3x4, F/ZN) Screws
n
n
4. Disconnect following harnesses to indicated connectors on the C293 MAIN board
assembly.
n Upper Head Cable
n
Lower Head Cable
n CR motor harness (5 wires)
n PF motor harness (4 wires)
n HP harness (2 pins)
n RE harness (2 pins)
n Front PE harness (2 pins)
n Rear PE harness (3 pins)
n PG harness (2 pins)
n Panel harness
5. Remove the printer mechanism. (See 4.2.7 "Printer Mechanism Removal".)
6. Remove 7 CBP-Tight (3x12, F/ZN) screws securing C293 MAIN board to the lower
case.
n Remove the upper I/F grounding plate and the I/F board guide; B.
(See Figure 4-10. "C293 MAIN Board Removal".)
n Then, remove the C293 MAIN board.
Disassembly and Assembly
When installing the shield plate, be careful not to pinch cables.
After the shield plate is secured with screws, make sure the cable
is not pinched.
from CN10, Gray
from CN11, Gray
from CN13, Red
from CN12, Black
from CN4, White
from CN5, Yellow
from C6, Black
from C7, White
from CN8, Blue
from CN3, White
Revision C
79