Epson Photo750 manual Unit Level Troubleshooting, Symptoms and Corresponding Flow Chart

EPSON Stylus Photo 750 Revision A

3.2 Unit Level Troubleshooting

This section contains the flow charts which are used to isolate the faulty unit by following the flow chart according to the problem caused during replacing or repairing the unit. You are to identify the faulty unit based on the primary symptom listed in the Table3-4. After this, refer to 3.4 Unit Repair and find and replace the defective parts.

Table 3-4. Symptoms and Corresponding Flow Chart

Symptom		Cause	Flow Chart
Printer does not	• No LED goes ON.
	•	Printer mechanism does not	1
operate.
		operate at all.
Error is detected.	•	LED indicates error.	2
Abnormal printing	• Printing is not performed.
	•	Bad printing quality.	3
operation.
	•	Abnormal printing.
	•	Abnormal paper feeding.
Paper Feeding is not	•	Paper jam occurs.	4
performed correctly.	•	Page heading position is not
		right.
Abnormal Control	No responds from the printer,		5
Panel	even after pressing switches.

1. Printer does not operate.

S T A R T
	I s		A C		n o r m a l
p o w e r v o			I n p u t
			lt a g e		s u p p ly .
	n o r m a		p o w e r
			l?
		N O
Y E S
I s t h e
				E x c h a n		g e t h e
f u s e ( F 1 )				o f
				D is c o n n e c t C N
p o w e r		s u p p ly					b o a r
b o a r d				t h e m a in
	Y E S
o p e n e d ? t u r n t h e p o w e
N O				a g a in .

C h e c k o	u t p u t v oN ltO aIgse t h
o f C N 2	in t h e p o wfeurs e
s u p p ly	b o a r d .	a g a in
		Y E S

I s t h e

o u t p u tN Ov o lt a g e o f p o w e r s u p p ly

n o r m a l?

Y E S

E x c h a n s u p p ly E x c h a n g e t h e m a in

b o a r d .

C h e c k t h e m o t o h e a d . R e f e r t o r e p a ir it e m o f p r in t e r m e c h a n

E N D

Figure 3-2. Flowchart 1

Troubleshooting Unit Level Troubleshooting 41