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4.6.13 Type Belt (285 Ipm)
Removal
1.
Turn the power off.
2.
Open the printer covers.
3.
4.
5.
6.
7.
Pull the print unit release lever
EI
toward
the front of the machine to open the print
unit (the print unit pivots down).
Open the upper ribbon shield, then raise both
ribbon guides
m .
Remove the ribbon from
the guides and place it on top of the
cassette.
Open the ribbon drive release lever
II.
Pull the type belt release lever
II
toward
the front of the machine.
Remove the type belt
m .
Upper Ribbon Shield
(shown open)
~
n
I
I
'-----J
J
Replacement
1.
2.
3.
4.
5.
6.
Open the upper ribbon shield, then raise both
ribbon guides
m .
Push the type belt release lever
II
toward
the back of the machine.
Install the type belt evenly around the top
of the pulleys
m .
Make sure the type belt
is positioned between the ribbon shield and
the platen.
Using the finger hole in the pulley
m ,
turn
the pulley counterclockwise until the belt
rides down to the positioning rollers located
under the lower ribbon shield.
Place the ribbon on the ribbon guides
m
then close the ribbon drive release lever
II .
Lower the ribbon guides and turn the type
belt pulley counterclockwise to verify that
the ribbon tracks between the metal and
plastic guides in the lower ribbon shield.
Close the upper ribbon shield. Turn the
pulley again to ensure that the ribbon tracks
under the upper ribbon shield.
7.
Press the print unit release lever
EI
toward
the back of the machine, close the cover,
and restore power.
Static Test for Type Belt Binds
1.
2.
Turn the power off.
Use the gram gauge to pull the belt. Ifmore
than 300 grams is required to start the belt
moving, there is a static bind.
Dynamic Test for Type Belt Binds
1.
Connect a X10 scope probe to P-4 pins
2.
1, 2, 3, or 4 (double" yellow or double black
wires).
Set the scope for internal sync, 20
volts/division, and 1 ms/division.
You should see a picture similar to the one
below.
I~
I"
n
71\
II
\
,
I~
~
\
-
U
,
\
V
~
If there is excessive drag, the scope picture
will look like this ..
~
I"
~
II
I ..........
~
h
l
I
1
IV
! -
IV"
-
~
Note the loss of amplitude in the negative
portion of the waveshape.
Belt Printer
285 Ipm
4-113
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