Epson MX-80 Technical Manual page 56

SYMPTOM 6
Paper feeding is not performed at all or the paper feeding motor vibrates and is not operating
properly.
No. Cause of Trouble
Defective paper feeding
motor assy or driver circuit
board
LF A
(014)
LF B
(015)
LF D
(017)
Check Point
elf PTS sensor board is not defective in
the above check, check the four line
feed driving transistors (014-017) for
normal collector waveform output (at
Pin Nos. 25-28 of CN6).
1
I'-
i"--
I
r-
_ _ _ _ _ .---1
I
LF C
(016)
I
124v
I-
Approx.
8.4
ms
3-19
I'-
-I
Repair Method
elf the collector wave form is
normal (proper voltage is out-
put for each phase), the paper
feeding motor is defective.
Replace it with a new one. See
paragraph 3.3.3 (6) for re-
placement.
I
i"--
r-
I
elf the collector waveform is
abnormal (proper voltage is
not output for each phase), the
driver circuit board is defec-
tive. Replace it with a new one.
See paragraph 3.3.2 (1) for
replacement.
REV. A