Epson SEIJ98006 Isolating the Faulty Part on the Power Supply Board, EPSON Stylus Color, Overview

EPSON Stylus Color 900 Revision C

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	Action
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 → 2) Relay board → 3) Control
	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.

Table 3-18.

Isolating the Faulty Part on the Power Supply Board (continued)

Step	Check Point		Action
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.

L 1 ( r e v e r s e s

		C N 1	sCidN e2 s id e
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.

T 1

( r e v e r s

C N 5 CSNid3

Troubleshooting Overview 90