Epson FX-80 Technical Service Data page 28
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Also See for FX-80:
- User manual (355 pages) ,
- Operation manual (203 pages) ,
- User manual (184 pages)
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TROUBLESHOOTING
(Continued)
PAPER FEED
MOTOR
If
the
paper
does
not
advance,
check
the resistance
of
the
Paper Feed Motor
(M4)
windings
at
pins 7 thru 12
of
Con-
nector
CN4.
Put the
Printer
in
Off Line
mode
by depressing
the
On
Line Button.
Press the
FF
(Form
Feed) Button
and
check
for
the
waveform
shown
in
Figure 5
at
pins
1
,
3,
6
and
8
of
Driver IC
(3C).
If
any waveform
is
missing,
check
for
the
square
waveform
shown
in
Figure 6
at
pins
16, 15,
10
and
9
of IC
3C
and check
IC
3C
by
substitution.
Check
for
22.2V
at
the
cathode
of
Diode D17
when
the
FF
Button
is
pressed.
If
the 22.2V
is
missing,
check
for
24.0V
at
the emitter
of
Motor Switch
Transistor
(Q15).
If
the 24.0V
is
missing,
check
the
power
supply,
refer to
the
"Power
Supply"
section
of
this
Troubleshooting
guide.
If
the 24.0V
is
present,
check
Transistor
Q15
and Motor Switch
Driver
Transistor
(Q5).
Also,
check Diodes
D15,
D16 and D17 and
associated
components.
Figure 5
5.3V
2ms
0V
DC
REFERENCE
Figure
6
53V
2ms
0V
DC
REFERENCE
o
-g
o
o
m
m
-a
CO
O
z
oo
o
17
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