INSTRUCTIONS FOR MARK 10 REPLACEMENT PEN

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002600100015-8
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: November 19, 2002
• Sequence Number: 15
• Publication Date: April 1, 1965
• Content Type: REQ

Approved For Release 2003/01/28 : CIA-RDP78BO477OA002600100015-8
This newly designed pen assembly is a direct replacement for
the pen assembly originally used in the Recorder. The
two pens are identical in appearance, however t ere has been
an important improvement made internally. The original pen
has a small brass screw located on the top front surface of the
pen tank, which is part of a broach-like pen tip cleaning device.
A similar screw on the new pen is part of an ink filter device.
The replacement pens are shipped full of ink and have the filter
screw properly adjusted. Filter installation, pen cleaning,
and adjustment are described below:
STAT
STAT
With proper use the I pen assembly will not normally
require extensive maintenance. However, the following procedure
is used to troubleshoot a pen that skips badly or fails to write.
It is assumed the pen is positioned and seated correctly in the
carriage. See Pen Installation and Removal in Operating Instruc-
tions.
1. Be certain pen is hot. If pen tank is not hot remove and
check resistance. Heater element resistance at room
temperature is 21 ohms.
2. Visually inspect or use cap vent tube as a dip stick to
check ink supply. (Figure 1)
CAUTION: Use only
SAT
STAT
]engineered Solid State Ink, Model 11-2763-01.
3. If unmelted wax or foreign material obstructs vent tube use
fine wire to clean out air vent tube.
4. To remove foreign matter lodged in pen writing tip, follow
the procedure described below:
Declass Review by
NIMA/DOD
STAT
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Page 2
a. Turn MODE switch to WRITE position. Set CHART
SPEED switch at 2" per minute and ZERO TEST
switch to the left, or ZERO TEST position. When
pen tank is hot, raise writing end on front of
tank approximately 1/4 inch off writing bar and
chart paper.
b. Place any object which has a diameter of approxi-
mately 1/8 inch (pencil tip, small screw driver,
etc.,) against paper and under either front corner
of pen tank.
C. Flick pen tank several times so that it strikes
sharply against 1/8 inch diameter object.
CAUTION: Be certain writing tip does not touch paper as pen
tank is flicked.
Normally several drops of ink will be expelled
through pen tip, thus clearing pen.
5. In an extreme case where the above procedure does not
remove obstruction, it will be necessary to disassemble
pen.
a. Be sure pen tank is hot, then remove it from pen
carriage as described in pen removal section.
b. Carefully remove small brass screw located on top
and at the front of pen tank. Attached to the end
of this screw is a small spring which acts as a
filter.
c. Remove vent tube cap and discard ink. (Figure 2)
d. Carefully clean pen tank filter and vent tube cap
and tank in chlorothene or trichloroethylene.
e. Hold pen up toward the light and see if pen tip is
unclogged.
f. If pen tip remains clogged, insert an .008 inch
diameter music wire from top side of pen tank then,
gently push through pen tip.
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Insert filter in pen tank and gently tighten
brass screw until it bottoms. This will completely
compress the spring and the screw head will be just
below surface of pen tank.
i. Refill pen with ink as described in pen refilling
instructions.
CAUTION: Do not allow pen to move across chart paper or chart
paper to move under pen unless ink is flowing from pen tip.
Take care not to run out of ink while unit is writing.
6. Check ink temperature indirectly by reading voltage applied
across pen. Set control in the INCHES PER HOUR position
and in the WRITE mode. Allow temperature to stabilize for
approximately 10 minutes. The reading across pen should be
between 9.5 to 10.5 volts D.C. Adjust if necessary, using
control R6 in power amplifier unit A50142. Pen voltage will
then read from 11.5-12.,5 volts in the INCHES PER MIN position.
NOTE: Adjust pen heat control only when in the INCHES PER HOUR
position. After adjustment allow at least 5 minutes for unit to
stabilize then readjust voltage, if necessary.
Approved For Release 2003/01/28 : CIA-RDP78B04770A002600100015-8
 Approved For Release 2003/01/28 : CIA-RDP78BO477OA002600100015-8
Cap Vent Tube
Figure 1
Figure 2
Approved For Release 2003/01/28 : CIA-RDP78BO477OA002600100015-8
 Approved For Releas003/01/28: CIA- 8BO477OA002600100015-8
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Approved For Relea'se'2003/01/28 : CIA-, F 78B04770A002600100g15-8