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4.6.19 Transducer Assembly (285Ipm)
Service Check
1.
Be sure the roller
m
is clean, and the clean-
ing blade
B
is positioned as shown. Loosen
the screw in the roller and reposition the
blade if needed. Ensure that the plastic pad
is fastened to the blade.
Note: Older machines have a metal blade
with a plastic pad, newer machines have a
plastic blade and no pad.
2.
While rotating the type belt, ensure that the
type belt turns the roller
m
and the roller
is not worn.
3.
Turn the power off.
4.
Check for 0.004 inch
±
0.002 inch (0.10 mm
±
0.05 mm) gap between the transducer tip
m
and a timing mark on the type belt
5_
The resistance of the transducer is 465
nominal measured on pins 1 and 2 of P5
(emitter and impression control).
Note: For oscilloscope setup, see 4.8.0.
Adjustment
CAUTION
The transducer can be damaged if the timing
marks on the type belt'strike the transducer tip
while the belt is moving.
1.
Remove the type belt (4.6.13).
CAUTION
Do not overtighten the transducer clamping
screws.
2.
Loosen screw(s)
m
and adjust the trans-
ducer in the mounting block to obtain 0.019
inch ± 0.001 inch (0.48 mm ± 0.03 mm)
clearance
tmI
between the transducer tip
and the guide roller.
3.
Install the type belt (4.6.13). Rotate the
type belt pulley until a timing mark is in
I ine with the transducer tip_
4.
Adjustment steps 2 and 3 should result in
a clearance of 0.004 inch
±
0.002 inch (0.13
mm ± 0.05 mm)
m
between the transducer
tip and a timing mark on the type belt. If
clearance is not correct, repeat adjustment.
r - - - - -
Plastic Pad (metal blades only)
0.004 inch ± 0.002 inch
(0.10 mm
±
0.05 mm)
Roller - - - -__
1
~;::;::;::::;;::::;:;::;::;,'
Roller---_I
'""===
0.019 inch
±
0.001 inch
(0.48 mm
±
0.03 mm)
No Type Belt
0.004 inch ± 0.002 inch
I~--
(0.13 mm
±
0.05 mm)
With Type Belt
Belt Printer
285 Ipm
4-117
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