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SWITCHES SET CPG. seconds after power turn-on may induce
an error into the bias calculation and
CAUTION cause the MMS to drift.
2. OPR mode select switch FWD. Allow MMS
• When MMS is operating but not being to stabilize.
used, the sight shall be slaved FWD to
prevent the payload assembly from
contacting and damaging the azimuth 3. MNL/SLAVE switch Press. Observe MMS
and elevation stops. slews FWD.
• Turn MMS mode select switch off if
MMS fails to respond to control 4. Laser codes Check; enter as required.
commands.
1. LASER ARM/STBY/OFF switch OFF. 5. Laser ARM/STBY/OFF switch STBY
2. FIRST/LAST switch As desired. 6. MMS current laser code Select appropriate
code as required.
3. VIDEO MMS SYM INTEN toggle switch
MAN.
4. VIDEO GAIN toggle switch As desired. 4-9. TIS MANUAL SETUP PROCEDURES.
5. VIDEO LEVEL toggle switch AUTO. 1. MFD contrast and brightness Adjust as
desired.
6. OPR mode select switch OFF.
7. ALFGL switch OFF. 2. Reposition MMS LOS to bland background.
8. TIS INTEG switch OFF.
3. Manually reduce GAIN to full negative
(minimum of 10 seconds), simultaneously
9. LMC switch OFF. activate ALE until horizontal lines are reduced
to a minimum.
10. ALE switch OFF.
4. Realign MMS LOS to a high contrast
4-8. ENGINE RUNUP MMS STARTUP background.
CHECKS CPG.
1. MMS key Press. 5. Adjust GAIN to positive until desired target
definition is achieved.
NOTE
6. Manually or automatically adjust FOCUS to
• MMS runup requires 3-phase AC power desired clarity.
from the AC generator or external AC
power. Prior to turning the MMS on, verify
required power is available. 4-10. MMS MANUAL BORESIGHT.
• When MMS power is turned on, the
system immediately checks the output of A manual boresight is recommended prior to the first
the LOS CONT switch on the CPG cyclic automatic boresight on a power cycle, when LOS reticle
control grip and supplies an opposite bias shifts off target upon FOV or sensor change, or when a
in order to zeroize the LOS output. REBORESIGHT message remains after automatic
4-30
TM 1-1520-248-10
boresight. If any of the previous conditions exists, • TIS HOT message may remain as an
accomplish a manual boresight as follows: advisory message. Disregard if TIS
picture meets operational requirements.
NOTE
1. FOV SEL switch Select narrow field of
• If required, TIS setup procedures should view for both TV and TIS sensors.
be performed prior to boresighting to
obtain proper TIS picture. 2. OPR mode select switch PREFLT.
• MMS is boresighted automatically in TV 3. LASER ARM/STBY/OFF switch ARM.
NFOV and TIS NFOV only. Manual
boresighting can be accomplished in wide 4. BRST AUTO key Press. Resolution targets
or narrow. Each sensor should be for each sensor appear for approximately 6
boresighted in WFOV prior to NFOV seconds each then disappear. Check clear
• Only one sensor FOV can be boresighted and in focus.
at a time in BRST MAN. To boresight
each, it is necessary to deselect BRST 5. LASER fire switch Press and hold before
MAN, select the other sensor and/or FOV, second resolution target disappears.
then reselect BRST MAN.
6. TV and TIS Verify laser spot size (TV: 1/16
1. OPR mode select switch PREFLT. - 1/8 inch, TIS: 2-3 lines for MSP, 3-4 lines
for IMSP). Verify target gate displays sizes
2. LASER ARM/STBY/OFF switch ARM. and tracks laser spot. There should be no
jitter of gate and spot should be centered in
3. TV/TIS switch Select desired sensor. gate (fig. 4-16 and 4-17).
4. FOV SEL switch Select desired field of NOTE
view.
Repeat a manual boresight; then repeat
5. BRST MAN key Press. Resolution target automatic boresight procedure if hot spot is
appears for approximately 6 seconds then shifted from center position or target gate
disappears. Check clear and in focus. does not size and track laser spot. MMS
maintenance is required if laser spot
6. LASER fire switch Press and hold. Adjust displays incorrectly (too large or small).
LOS reticle until it is centered over the laser
spot by adjusting the LOS CONT switch. 7. BRST COMPLETE message Appears in
Then release LASER fire switch. status block.
7. BRST MAN Press to deselect manual 8. LASER fire switch Release.
boresight.
9. LASER ARM/STBY/OFF switch Set as
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(98)
