Epson Photo750 manual Unit Repair Power Supply Board, Repair of the Power Supply Board

EPSON Stylus Photo 750 Revision A

3.3 Unit Repair (Power Supply Board)

This section describes the problems related to the power supply board. The table below provides various symptoms, likely causes, and checkpoints. The checkpoints refer to waveforms, resistance, and other values to check to evaluate the operation of each component.

Table 3-5. Repair of the Power Supply Board

Sympto	Condition	Cause	Check point	Solution
m

Table 3-6. Repair of the Power Supply Board

Sympto	Condition	Cause	Check point	Solution
m

The
printer	+42VDC
does not	line does
operate at	not work.
all.

F1 is open.	Check F1 is normal or not by using	Replace
	a multimeter.	F1.
Trans T1 is	Check T1 is normal or not by using	Replace
open.	a multimeter.	T1.
	Check the drain wave.

FET(Q1) is	Replace
broken.	Q1.

	Check the collector wave.
Q2 or Q3 is		Replace
		Q2 or
broken.
		Q3.

The printer does not operate at all.

+5VDC line does not work.

IC51(FA36 35A) is broken.

Check the output wave(pin 8).

Replace IC51.

PC1 is broken.

Replace PC1.

Troubleshooting Unit Repair (Power Supply Board) 44