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4.2.13 Type Belt (50, 100, and 155 Ipm)
Removal
1.
2.
3.
4.
5.
6.
Turn the power off.
Open the printer covers.
Pull the print unit release lever
B
toward
the front of the machine to open the print
unit (the print unit pivots down).
Raise both ribbon guides
1i3.
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.
7.
Remove the type belt
m
@
c
Replacement
1.
2.
3.
4.
5.
6.
7.
Raise both ribbon guides
rl .
Push the type belt release lever
11
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 underneath the platen.
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 to ensure that the ribbon tracks
properly.
Press the print unit release lever
II
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. If
more than 150 grams is needed to keep
the belt moving, there is too much drag.
Dynamic Test for Type Belt Binds
1.
2.
Connect a X 10 scope probe to P-4 pins 1, 2, 3,
or 4 (double yellow or double black Wires).
Set the scope for internal sync, 20 volts/division,
Jnd 1 ms/division.
You should see a picture similar to the one
below.
/1\
('\
In.
I
1
I
1\
,
"-
l'l
D
j
'\
I
d
\
I~
V
V
1
If there is excessive drag, the scope picture will
look like this.
r
11'\
r\.
I
,-....
r1
'Or!
l
L
V
V
-
1
Note the loss of amplitude in the negative portion
of the waveshape.
Belt Printer
50, 100, and 155 Ipm
4-35
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