e. Vacuum turbo-compressor
e. Replace defective parts of vacuum turbo-
Replace entire unit if necessary.
3. Arc lamp flickers
a. Gap between carbons too great
to provide consistent lighting.
b. Drafty conditions around operating
b. Eliminate all drafts around working area
c. Carbons of different lengths in
c. Substitute carbons of same length or
d. Contacts in magnetic contactor
d. Smooth badly pitted or burned
not making proper contact.
e. Defective sensing device.
e. If one lamp does not flicker, switch the
cables from the operating lamp sensing
device to suspected sensing device. If the
lamp which did not flicker now does, replace
4. Image distortion
Copyboard not aligned with
a. Trammel four corners of copyboard with
focusing glass for correct alignment of
components. Check that focusing glass
frame is firmly contacting at magnetic
latches on both sides of frame
b. Lens not positioned correctly.
readings. Determine if lens is screwed in
the lens plate.
c. Copy not placed on copyboard
c. Remove copy and remount on
copyboard, smoothing out wrinkles and
d. Lensboard or copyboard
positioning counters not calibrated to
e. Distance of lensboard not related
e. Recheck the focusing Chart for correct
to same reduction ratio.
lensboard and copyboard distance.
f. Thick copy.
f. If copy has appreciable thickness, its
thickness must be added to the copyboard
counter readings in units of 1/100 inch.
5. Vibration or excessive noise
a. Impeller plates in vacuum turbo
a. Remove the vacuum turbo-
Dry oil felt wipers causing
oil to wipers.
Let the oil
lensboard or copyboard to vibrate
penetrate thoroughly before resuming
while under power.
c. Compressor fan in turbo-
compressor motor rubbing against
rear end frame.
turbo- compressor motors or drive
e. Loose mounting hardware.
e. Locate loose hardware and tighten.
f. Gear meshing.
f. Vibration or noise will result if drive gears
are not fully meshed. If gears are dry, apply
sufficient grease, or if foreign matter is
impacted between the teeth, clean
thoroughly, or if a tooth is damaged, dress