Service manual
TROUBLESHOOTING
GUIDE
(Continued)
SYMPTOM
5:
Improper Ribbon Feed
POSSIBLE CAUSE
SOLUTIONS
1.
Obstruction
of
ribbon path. Check
FPC
cables
for
proper location.
Check ribbon guide
for
foreign
matter.
2.
Defective
ribbon cartridge. Check
for
proper ribbon insertion.
Check
the
rotation
of
the
cartridge
by
manually
rotating
the
ribbon in
the
direction
of
the
arrow.
3.
Defective
mechanics. Check
the
ribbon drive gears
for
proper lubrication
(see page 5) and
smooth
opertion.
SYMPTOM
6:
Carriage does
not
move
correctly.
POSSIBLE CAUSE
SOLUTIONS
1. Physical
obstruction
in
the
Check
that
dirt
or foreign
objects
have
not
path
of
the
head carriage. accumulated
within
the
mechanism.
2.
Carriage
motor
is
defective.
With
power
off,
check
the
motor
with
an
ohm-
meter. Place one
of
the
leads on pin
13
of
J 1 and
read
the
resistance
to
pins
21,
22,
23
and
24
of
J 1 . A good carriage
motor
will
read
about
50
ohms.
Check
for
good mechanical and electrical connec-
tions
to
the
motor
and
its
wiring
- see
wiring
diagram on page
28.
Check
for
+
26
VDC supply
to
the
motor.
3.
Circuit
failure on PCB. Check
motor
circuitry
on PCB. See
circuit
theory
on page
12
for
proper
circuit
operation.
21