Epson LX-810 - Page 152

REV.-A
Table 5-4. TAMA Board Unit Repair (Continued)
Problem
Symptom Cause
Check point Solution
‘aper is not The paper
The
IC 3B or At Q21 - Q24, check the base waveform
Replace
‘ed normally. feed pitch is
transistor and collector waveform.
Q21 - Q24.
abnormal Q21, Q22,
+
or
IC3B.
(open-phase)
Q23 and
Q24
Ba se
defective.
~
+1
Col Iect
or
-m+
-m+ +tH-
-H+t +,
\
—
v
m
m
5V
2 Ov
2m s
Tex
The paper Q16 OR
Check transistor Q 16 or Q20.
Replace
Q16
does not
Q20 is
or
Q20
feed, or the
defective
feed pitch is
abnormal
(lack of
torque).
‘rinting in Data corrup- IC 3B is
Check the
input\output signals of IC 3B.
Replace
IC
)N-LINE
tion occurs
defective.
3B.
node is
when the
]bnormal. parellel in-
{
terface is
used.
5-17