Isolating The Faulty Part On The Power Supply Board - Epson Stylus COLOR 880 Service Manual

EPSON Stylus COLOR 880

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 3-10. 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
CN11 (black, 12-pin) transfer signals, the printer does not operate
on the Main Board. despite the power supply board and the main board
are properly connected.
3 Is the 3pin of the Panel Check the 3pin's line on the Panel FFC with the
FFC breaking wire circuit tester.
condition?
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 CN1 on the power Check that the connectors CN1, which are used to
supply board apply AC power to the primary side on the PS
disconnected? board, are properly connected.
6 Is CN10 on the Main Check that the connector CN10, which are used to
Board disconnected? apply the DC voltage to the Main board, are
properly connected.
Troubleshooting
Action
Overview
Table 3-10. Isolating the Faulty Part on the Power Supply Board
Step Check Point
7 Is the choke coil L1 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
68