Isolating The Faulty Part On The Power Supply Board - Epson Stylus Color 980 Service Manual

EPSON Stylus Color 980

3.1.2 Isolating the Faulty Part on the Power Supply Board

This section explains how to troubleshoot the following problems:
The printer is turned on, but the initialization is not performed and
LED on the control panel do not come on.
Problems after power on
Be sure to perform troubleshooting in the order specified, because the
parts involved are mentioned in the disassembly procedure to facilitate
servicing.
Table 3-17. Isolating the Faulty Part on the Power Supply Board
Step Check Point
1 Is the panel FFC The power switch for this printer is in the secondary
disconnected from the side. Therefore, if the FFC does not transfer
connector on the panel signals, the printer does not operate despite the
board? power supply board and the main board are
properly connected.
2 Is the panel FFC This printer uses the power switch on the
disconnected from the secondary side. Therefore, if the FFC does not
connector (black, 12- transfer signals, the printer does not operate
pin) on the relay board? despite the power supply board and the main board
are properly connected.
3 Is the connector The reason is the same as above.
disconnected from the
The panel control FFCs are connected via 1) CN15
CN15 on the main
on the main board
board?
Panel.
4 Has the fuse (F1) on Check if the line in the F1 located beside the CN1
the power supply board on the power supply board has blown.
blown?
5 Is CN2 or CN3 on the Check that the connectors CN2 and CN3, which
power supply board are used to apply power to the main board, are
disconnected? properly connected.
Troubleshooting
Action
2) Relay board 3) Control
Overview
Table 3-18.
Isolating the Faulty Part on the Power Supply Board (continued)
Step Check Point
6 Is CN 5 or CN6 on the Check that the connectors CN5 and CN6, which
main board are used to input power from the power supply
disconnected? board, are properly connected.
7 Is the choke coil Viewing the reverse side of the power supply
broken? board, check for the proper continuity at the two
points indicated in the figure below.
8 Is the transformer (T1) Referring to the figure below, check if the
broken? transformer is disconnected between the poles. Try
every combination in each group marked with a
blue box.
Revision A
Action
88