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REV.-A

Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued)

Problem

Symptom

Cause

Checkpoint

Solution

Self test

The printer

IC4

is

Check the head pulse signal at pin 31 (input)

Replace

IC4.

printing does not

defective.

and pin 63 (output).

abnormal

print the self

test.

I

(CH2:P

IN 31)

~

~

.W

—

~

~

~

i !

-

e

II

I

!

f I

!1

I

~

~

~

*

-

[ ( I

I I

I

I

I

II

I I I I I

!

I

II

1

II

I

II II

II

I

I

I

I

II

I 1

I

,

(

CHI:PIN

63)

~

~

m

%

4

~

m

m

~

\

I f

f

~

!

—~

,

:

$$

*

n

9

*

-

9

w

W

9

CH1=5V

CH2=5V

TIME= O.2ms

1 1 1 1

1

[

Self

test A particular

One of the Check the head drive signal at the base and the

If

the signal

Jrinting

dot fails to

head drive

emitter of each transistor.

at the base

~bnormal. print.

transistors is

is normal,

defective

L

J-

repiace the

(Q2,

4,5,6,

4CH2:Emitter)

transistor.

8,9, 10, 11,

J

Otherwise,

or 12).

*

%

replace

IC4.

b

m

i

7.

-

E

m

9

m

---

-

#

I I

I

I I I

I

I

II

I

1

I

I

1

b

+-Ii-&

+1+-1-

-+-H+

U+t

-W+

-H-t

(CHl:Base)

*

9

I

~

CHl=2b CH2=50V

TIME=O.5ms

1

1

I

[

1

I

5-16