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Lower Plate
0
Idler Stud
-4-Drive Sprocket Stud
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6
Ribbon Guide Bar
Upper Plate
Eccentric Adjusting Screws
N,
Drive Sprocket
Lubricator
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Platen
Center Plate
Type Idler
Type Slugs
Figure 6. Type Array ( Cartridge Assembly)
6. The factory adjustment of the eccentric adjusting
screws for the upper and lower plates (two for each plate)
should be changed
only in an emergency.
This adjustment
sets the clearance between the platen (or the type slugs)
and the lips of the upper and lower plates. This also adjusts
the relationship between the drive sprocket and the path
of the chain past the platen. The chain must travel in a
path that is tangent to the drive sprocket where the chain
leaves the sprocket. In an emergency situation an attempt
to make this adjustment can be made by adjusting the
plates as close to the chain as possible with no binding of
the chain. It should move freely with 400 to 600 gram force.
Do not use gram gage.
7. Replace the ribbon guide bar.
Adjust Magnetic Read Head (Figure 3)
1. Remove the ribbon and type array.
2. Check the adjustment of the magnetic read head.
a. The read head must be positioned
to
obtain a
clearance to the periphery of the magnetic timing
disk of 0.003" to 0.001".
(1) Do not use a feeler gage between the read
head and timing disk. The feeler gage, may be shaved,
and these shavings will form a flux bypass at the slots.
(2) Use a sheet of paper (carriage tape is good)
to determine the high spots by inserting paper between
the read head and the timing disk and rotating disk.
(3) Remove the paper.
b. At a timing speed of 750 rpm, minimum read head
output voltage must be 100 millivolts peak to peak.
3. If the conditions stated in step 2 are met, no further
adjustment is necessary. Proceed to step 5.
4. If the conditions stated in step 2 are not met, do
one or more of the following:
a. check for cold solder joints at amplifier wire wrap.
b. magnetize the timing disk.
c. replace the read head.
d. replace the read head and magnetize timing disk.
5. Replace the remaining parts in reverse order.
Magnetize Timing Disk
1. Remove the 1403 cover on the right side.
2.
Check that the connections to the amplifiers do not
have cold solder connection at the wire wrap.
3. Use an edge connector insert that has a 2-watt 300-
ohm resistor connected between pins Q and B, and has pin
D jumpered to pin J.
4. Magnetize the timing disk.
a. Remove amplifier one.
b. Remove amplifier two.
c. Insert the altered edge connector into amplifier one
receptacle.
d. Turn on the system power.
e. Run the timing disk for a few revolutions.
f. Turn off the system power.
g. Remove the edge connector.
h. Replace the amplifiers.
5. Check the output and rise time of the head signal.
6. If the rise time is slow, repeat step 4 but use an
altered edge connector that has the 300-ohm resistor con-
nected between pins Q and D and has pin B jumpered to
pin J. This is necessary because of a reverse charge on the
drum.
7. Check the output and rise time of the head signal.
8. Replace the cover on the right side.
Hammer Unit
Hammer Unit Removal (Figure 7)
1. First, glance through the following steps and decide
which are necessary for the job at hand.
2. Prepare for removal.
a. Remove the forms.
b. Remove the top forms guide.
c. Remove the service mounts from the inside of the
left front cover.
d. Slide the rear forms stacker down out of the way.
e. Open the rear door and remove the inside rear
cover.
f. Remove the air hose and place out of way.
g. Loosen the service mount holding screws on the
translator frame.
h. Install the service mount and tighten the screws.
i. Remove the hammer unit holding screws.
3. Slide the hammer unit out on the service mount.
4. Disconnect the hammer unit from the printer.
a. Remove the rear cover from the unit.
b. Tilt the hammer unit up and remove the upper and
lower covers over the magnets.
c. Separate quick disconnect electrical connections.
d. Tilt the hammer unit to the normal position and
remove the cable brackets with the cables attached.
5. Remove the hammer unit from the service mount.
a. Tilt the hammer unit up ( hammers up) .
b. Remove the clips on the service mount hand screws.
c. Remove the hand screws.
d. Place your forearms with palms of hands up under
hammer unit.
e. Carefully lift the hammer unit with both arms until
the hammer unit is free of the service mount.
f. Tilt the unit toward you so that it cannot fall.
g. Withdraw the unit clear of the machine.
h. Place the unit on a flat surface.
6. Carefully re-install the hammer unit in reverse order.
CAUTION: Do not let the unit drop. Insure that the mag-
net leads do not bind or interfere with magnet armatures
when the covers are installed.
Position the Hammer Unit - Factory
1. Position the hammer unit front to rear ( factory speci-
fication and adjustment).
a. The positioning of this unit is to be made with the
T-casting locked in place and the print impression
control lever set at C.
b. The hammer unit is to be positioned in the trans-
lator frame so that the front surface at both ends of
the hammer unit casting ( at print level) are located a
distance of 1.3715" ±0.0015" from the face of the
type characters.
. %•::,
c. Any single-type slug as measured at the ends of the
type array must be parallel to the front surface of the
hammer unit frames within 0.001".
Position the Hammer Unit - Field (Figure 7)
1. This adjustment depends upon the T-casting being
located correctly front to rear and the type array and
movable base being adjusted correctly on the T-casting.
If doubt exists as to the correctness of these prerequisites,
the factory adjustments must be used.
2. Prepare to position the hammer unit horizontally.
a. Remove the forms from the machine.
b. Remove the ribbon shield and print line indicator.
c. Remove the upper paper guide support bar.
d. Remove the hammer cover (nose cone) .
e. Remove the ribbon.
f. Set the print impression control lever to C.
3. Check the positioning of the hammer unit horizontally.
a. Lock the T-casting against the gate latch bumper
screw on the left.
b. Check for clearance of 0.078" between the hammer
face and cartridge lip or 0.083" between the hammer
and the type face.
c. Check for this clearance both to the left and to the
right.
4. If the conditions of step 3 are met, no further adjust-
ment is necessary. Proceed to step 6.
20
REMOVALS AND ADJUSTMENTS
21
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