3M 66 SERIES OVERHEAD
Please read all of the text below before selecting a manual page.
Page 1: 3M 66 HEAD & POST, OLD STYLE
Page 2: 3M 66 HEAD & POST, 1093/1094
Page 3: 3M 66 HEAD DETAIL
Page 4: 3M 66 STAGE, LARGE, 1093/1094
Page 5: 3M 66 STAGE, SMALL
Page 6: 3M 66 STAGE, ANTI-GLARE
Page 7: 3M 66 STAGE, MASKED
Page 8: 3M 66 LAMPHOUSE, "FAL"
Page 9: 3M 66 LAMPHOUSE, "DYS"
Page 10: 3M 66 LAMPHOUSE, "EHA"
Page 11: 3M 66 LAMPHOUSE, "EHA" (DUAL) 1094
Page 12: 3M 66 LAMPHOUSE, "EHA" (SINGLE) 1093
Page 13: 3M 66 LAMPHOUSE, "EHA/BVE"
Page 14: 3M 66 LAMPHOUSE, WITH LAMP CHANGER, "BVE"
Page 15: 3m 66 LAMPHOUSE, "BVA"
Page 16: 3M 66 LAMPHOUSE, "BRH"
Page 17: 3M 66 ACCESS DOORS
Page 18: 3M 66 POWER SWITCHES
Page 19: 3M 66 CASE BOTTOM, WITH INTERLOCK
Page 20: 3M 66 CASE BOTTOM, WITH FLANGE POST MOUNT
Page 21: 3M 66B CASE BOTTOM, WITH INTERLOCK, POWER SWITCH 1093/1094
Page 22: 3M 66 FAN ASSY IN SHROUD (500+ watts)
Page 23: 3M 66 FAN, DETAIL w/o SHROUD (420 watts)
Page 24: 3M 66 SCHEMATIC AR,ARC/ARW,ARD,ARL,ARY
Page 25: 3M 66 SCHEMATIC AFW,AG,AKD,AKM,ALA,ALB,ALL,ALT,ANY
Page 26: 3M 66 SCHEMATIC 566RG,RGL,RGY, 567GC,GM
Page 27: 3M 66 SCHEMATIC 212AG,ALC/ALD/ALE, 221AMC/AMP,AME
Page 28: 3M 66 SCHEMATIC 521, 522, 526
3M introduced the Model 66 overhead projector in 1963 and continued to
produce them until 1975.In 1986 it was revived as the 1093/4 or
the 66B and produced for a short time in Brazil. It is our conservative
estimate that 3M produced over 24 million of these machines which is why
you'll find them everywhere. Overhead projection principals have not changed
in the last 40 years so a Model 66 made in the 60's is just as serviceable
as an overhead manufactured today.
When repairing your Model 66 projector please pay attention to the differences
between projectors and check the information we have provided against your
machine to make sure you are ordering the correct part!
HEAD- this is the part that is mounted on top of the post and moves back
and forth to focus the projector. A variety of different heads were
used on the projectors and since the projection lenses are no longer available
you need not be concerned with the differences except that there were 4
different sized mirrors used in the heads. For convenience we have listed the
part numbers and the sizes of the mirrors to help you get the correct part.
These mirrors are made from special "front coated" stock so you can't just
go down to the hardware store and get a mirror cut and slap it into the
machine.
| WIDE X LONG FRACTIONS |
WIDE X LONG DECIMAL |
3M PART NUMBER |
| 2 1/2 X 4 7/8 |
2.500 X 4.875 |
78-8005-2148-2 |
| 2 3/4 X 4 7/8 |
2.750 X 4.875 |
78-8705-3063-7 |
| 3 1/16 X 5 1/2 |
3.0625 X 5.500 |
78-8705-3043-9 |
| 3 7/8 X 4 7/8 |
3.875 X 4.875 |
78-8705-3062-9 |
If the mirror is broken piece it together to get the size or measure the opening of the mirror bracket very carefully as you can see only a small difference is another part number.
FOCUS ASSEMBLY- There are three different posts used in the overhead. One post has a mounting flange (triangular piece of metal) welded to it where it attaches
to the bottom of the projector (p/n 78-8003-7640-8) the other two are mounted
directly to the projector base. As none of these parts are available its not
important what the part numbers are this information is for reference only.
There are two different focus arrangements the original one uses a rack with
a push button and spring. Press the button and slide the head up and down
the post one rack notch at a time. None of these focus arrangement parts are
available. Of the two remaining focusing arrangements the earliest one uses
a splined focus shaft which uses a splined gear. No part numbers are available
for those parts and they are no longer available but you can use the current
focus knob with the current focus gear and it will work just fine. The locking
block which serves to add friction to the focus knob is no longer available.
The machine works just fine with out it. If you need to take up the slop
because of the missing locking block you can use washers to take up the
space.
STAGE- There are 4 different plastic stage frames for the Model 66 projector
in its various versions. None of these plastic stage frames are still available
but lots of them can be repaired by placing sheet metal pieces on the inside
of the plastic part and securing through the plastic with pop rivets and to
the inside of the frame with epoxy. This will work providing you are not
missing plastic parts and the breaks are minor else use this as a parts
machine to repair other machines.
GLASS- the glass is attached to the overhead stage in one of two ways. The
glass is held by 4 clips one in each corner of the stage. The part number
for this stage is 78-8000-7416-9 and is 10.380" square. The other method
of attachment is two metal clamps holding the edge of the glass at both
the front and rear of the machine. The piece at the rear might be a molded
plastic or extruded aluminum piece which was referred to as a "pencil" tray.
The part number for this glass is 78-8000-5257-9 and is 11.250" inches
square. The other glass held in by clamps is smaller than the one listed
previously and is p/n 78-8993-1792-5. It has a "black MASK" painted on the underside and is 10.380 inches square but has beveled edges only.
LAMP DOORS- there are 5 versions of the lamp door counting color change.
The Beige door with the snap in door lock (using a hole about the diameter
of a pencil) is p/n 78-8222-6732-4 and the grommet (p/n 78-8613-5102-7) and
the plunger (p/n 78-8616-6503-8) are sold separately. The door with the
turn type of latch (needing a hole about the size of a quarter) is p/n
78-8000-7755-0 but there are none of the latches (p/n 78-8000-7751-9 and
78-8003-8952-6) still available. There are two other p/n doors which have
extended tabs to accuate interlocks 78-8000-7788-1 (brown) and
78-8022-6759-7 (beige) which are no longer available.
LAMPHOUSE- The 66 was manufactured in various forms using different projection lamps and lamphouse components. By determining what lamp is in your projector first you can then find the correct parts for your version of the projector. Look at the white ceramic base of the lamp for a 3 letter code. If you have no lamp then you must look at each drawing to match it to the machine parts you have.
FAL-(420 watts) this is a long thin tubular lamp with contacts on each end. Since there are no components available you can purchase a replacement KMR FAL-KIT to repair the projector. The complete replacement lamp house assembly comes with a new reflector and new ceramic lamp sockets.
DYP-(600 watts) there are no lamp components available for this lamphouse assembly. You can replace the lampsocket and reflector assembly with a KMR DYS-KIT and then use a DYS lamp in this projector or you can use the 3M EHA update kit.
DYS-(600 watts) some of the individual components are available for this lamphouse.
EHA- (515 watts) most of the individual components are available for this lamphouse.
BVE- (625 watts) most of the individual components are available for this lamphouse.
BVA-(1000 watts) while there were very few of these projectors produced there are lampsockets available for this lamphouse.
BRH- (1000 watt) this projector uses a tublar lamp similiar to the FAL listed above but with twice the light output and lots of heat. There are NO parts available for this lamphouse but it is shown for the sake of completeness.
POWER SWITCH-There were 3 main types of power switches used in the 66 projectors.View 1shows 3 position switch with a fan only position to allow a cool down cycle for the projector. View 2 shows a switch resembling a house wall switch that has modified mounting brackets. View 3 is a two wire two position switch. A 2 position 4 wire switch and the rocker switch that snaps in a hole in the 66B or 1093/1094 are NOT shown as part of the switch page but are shown on page # 21 with the case bottom.
CASE BOTTOM-there are almost no parts for the cases other than the lamp access doors and the lamphouse components shown elsewhere. These parts are shown for completeness.
FAN MOTORS and FANS- the fan motors are no longer available but almost any two pole shaded motor will work and turn about the right speed. The trick is to find a fan of the proper size that will fit the motor shaft and will move air in the correct direction (out of the projector).