Epson FX 1170 Service Manual - Page 119
bnormal, IC2CI, peration, arriage, CH2:PIN, CHI=5V, TIME=O.lVS
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REV.-A Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Problem Symptom ~bnormal The CPU )peration at does not )ower on. operate properly. Cause The CPU is defective. Checkpoint Solution Check the oscillator signal (IC2CI pin 27 or pin 28). If the signal is not correct, replace IC2CI . Otherwise, replace CR1. CHI=2V 11 TIME=O.lVS [ 1 ;arriage operation ~bnormal. The carriage does not operate at all. IC6 is defective. Check the input signal (pin 5) and the output waveform (pin 8). Replace IC6. - ( CH2:PIN 8) % B i$ ! f'! -~u *q w l--, s I ~ ' ?- -- - I I I I I I 1 I I 1+1 I I I I I I I I I (CH1: PIN 5) Ill I I I I I - II I I I I I I I 1+ falw w ~ d ~LkL CHI=5V CH2=50V I I 1 [ TIME= O.5ms 1 i 5-15
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REV.-A
Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued)
Problem
Symptom
Cause
Checkpoint
Solution
~bnormal
The CPU
The CPU is
Check the oscillator signal
(IC2CI
pin 27 or pin
If the signal
)peration
at
does not
defective.
28).
is not correct,
)ower
on.
operate
replace
properly.
IC2CI
.
Otherwise,
replace CR1.
CHI=2V
TIME=O.lVS
1
1
[
1
;arriage
The carriage
IC6
is
Check the input signal (pin 5) and the output
Replace IC6.
operation
does not
defective.
waveform (pin 8).
~bnormal.
operate at
all.
—(
CH2:PIN
8)
%
B
*
q
w
i
$
!
l–
–,
s
I
~
‘
f
‘
!
-
~
u
?
-
-
-
-
I
I
I
I
I
I
II
Ill
I
1
I
I
1+1
I
I
I
I
I
I
I
II
II
II
I
I
I
I
I
I
I
1+
(CH1:
PIN
5)
-
falw
w
~
d
~
L
k
L
CHI=5V
CH2=50V
TIME= O.5ms
I
I
1
[
1
i
5-15