Epson MX-80 Technical Manual page 55

SYMPTOM 5
The carriage assembly does not operate at all.
No. Cause of Trouble Check Point Repair Method
1 Defective timing belt motor elf
timing signal is output at Pin No.1 of
elf
the collector wave form is
assy
8041, check the four carriage driving
normal (proper voltage is out-
transistors (010-013) for normal col-
put for each phase), the timing
lector waveform output (at Pin Nos.
belt motor is defective. Re-
21-240f·CN6)
place it with a new one. See
paragraph 3.3.3
(5)
for re-
placement.
CR A
l"-
I
I"-
(010)
I
~
~
CR B
I
I
(011)
I' - -
I' - -
CR C
I
(012)
! A PP' O , 24vr-
CR D
I
I
(013)
l"APprox. 4.16 ms
-I
Movement of head: left to right
(Normal character printing)
2 Defective control circuit elf
the collector waveform is abnormal elf no base voltage is properly
board (proper voltage is not output for each output, the control circuit
phase) in the above check, check each board is defective. Refer to
carriage driving transistor for output of paragraph 3.43.
normal base voltage.
3
Defective PTS sensor board
elf
timing signal is not output at Pin No.1 elf defective. replace the PTS
assy of 8041, check PTS sensor board for
sensor board assy.
See
abnormality. paragraph 3.3.3 (4) for replace-
ment.
REV. A
3-18