Specifications

REV.-B
Table 5-4. Repair of a Problem in the BOARD ASSY., MAIN (Cont.)
Problem Symptom Cause
Checkpoint
Solution
Self-test print- Self-test is The CPU can’t Measure the voltage at Vref (pin 1) of Adjust VRl.
ing is
not executed. measure the
ICIC. The normal voltage is 4.741 V.
abnormal.
voltage on
the +35V
line.
IC4D is At IC4D, check the input signal at pin 101 Replace IC4D.
defective.
and the output signal at pin 46.
I I
I II
I
14 L+L*
2v 2v
0.2ms
A particular
IC2A is
Replace IC2A.
dot is not be- defective.
ing printed.
Paper is not
The paper
IC2A is Replace IC2A.
fed normally.
does not defective.
feed, or the
feed pitch is
abnormal.
Printing of da-
Data corrup- IC4D or IC5D
Replace IC4D
ta from the
tion occurs is defective.
or IC5D.
host comput-
when the par-
er is faulty. allel interface
is used.
5-16