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GEI-83910
4.
Shaft End Play:
The end play of the shafts of the three main units should be
1/64".
This can be adjusted by the position of the upper pivot.
Be sure to
tighten the set screw that holds the upper pivot
in position after the
adjustment is completed.
5.
Barrel Contact Wipe Check and Adjustment:
To check for the proper amount of
contact wipe, first loosen the screw that locks the barrel contact in its
mount i ng block so that the barrel contact can be threaded in and out.
Next
hold the moving contact still.
In the top unit, do this by using the stop
screw of the low-gradient contact.
In the middle and bottom units, do this by
pushing the moving contact against the other barrel.
Now thread the barrel
contact until its silver contact tip just touches the moving contact.
Use a
neon 1 i ght as an i nd i cat i on of contact closure.
Cont i nue to thread the
contact barrel until the back of the contact touches the diaphragm behind it
(See Figure 6)
The point at which this occurs can only be determined by feel.
CAUTION:
Do not thread the barrel past the point where the contact first touches
the diaphragm; further threading of the barrel could damage the diaphragm.
The number of degrees of contact barrel rotation between when the silver
contact tip just touches the moving contact and when the back of the contact
touches the di aphragm behi nd it determi nes the contact wipe.
Rotating the
barrel 45° corresponds to a 0.004 wipe, while 105° corresponds to a 0.009
wipe.
If the proper wipe is not noted, then the spiral spring upon which the contact
tip is fastened must be re-formed.
Remove the contact barrel
from the
mounti ng block and remove the threaded cap.
Lift off the spi ra 1 contact
assembly.
Holding the outer edge of the spiral with your fingers, place a
tweezer on the inside of the spiral next to the contact cone.
If more wipe is
reqUired, then lift the inside spiral so that the contact tip is stretched
away from the diaphragm.
If less wipe is required, then the spiral should be
stretched so as to move the contact tip toward the diaphragm.
Make sure that
the spiral is not distorted or bent during this process.
Replace the spiral
contact assembly on the barrel and screw the cap onto the barrel.
The wi pe
should
now be re-checked
by following the above procedure.
It may be
necessary to repeat the wipe adjustment until the proper wipe is obtained.
To finish the procedure. set the proper contact gap.
ELECTRICAL ADJUSTMENTS
Clutch Adjustment:
The clutch is adjusted by means of the screw located on
the right-hand side of the moving support.
See Figure 1 for location of this
screw.
To readjust the clutch, first loosen the hexagonal
locking nut on the
adjusti ng screw.
Turni ng the screw into the shaft (cl ockwi se rotati on of the
screw) increases the value of current necessary to cause the clutch to slip.
On
the G2 unit it is recommended that the clutch adjustment be made with the taps in
the lower tap range.
GDIX Pickup:
To change the pickup time or voltage of the GDIX unit, resistor
Rl is adjusted (see Figure IB).
Increasing Rl will increase the pickup voltage and
pickup time.
Be certain the slide band on Rl is retightened after this adjustment,
but do not overtighten, to avoid damaging the resistance wire.
16
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