TM-9-1240-401-34-P
TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 1993
TM-9-1240-401-34-P - Page 244 of 590
TM 9-1240-401-34&P
Section III. Troubleshooting
5.1-8. GENERAL
a.
The symptom index can be used as a quick guide to troubleshooting. Common malfunctions are listed in alphabetical
order with a page number reference to the troubleshooting table where a test or inspection and corrective action are
provided.
b.
The direct support troubleshooting table (ref. para 5.1-10) lists the common malfunctions which may be found during
maintenance of the M15 quadrant. Perform the tests/inspections and corrective actions in the order listed.
c.
The general support troubleshooting table (ref. para 5.1-12) lists the common malfunctions which may be found during
maintenance of the M15 quadrant.
Perform the tests/inspections and corrective actions in the order listed.
d.
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions.
If a
malfunction is not listed or is not corrected by listed corrective action, notify next higher maintenance level.
5.1-9. DIRECT SUPPORT SYMPTOM INDEX
Troubleshooting
Procedure
(Page)
CORRECTION KNOB ASSEMBLY
Correction knob binds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . .
5.1-12
COUNTER ASSEMBLY
Correction counter fails to allow +50 mils min or -50 mils min . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1-12
COVER ASSEMBLY
Counter dials have uneven or no illumination with 24 volts DC applied.
. ....................................................
5.1-11
Counter windows are fogged or have condensation.
. .............................................................................
5.1-12
LEVEL ASSEMBLY
Level vials have uneven or no illumination with 24 volts DC applied .
........................................................
5.1-11
Level vial has no bubble or is cracked.
...............................................................................................
5.1-11
5.1-10
Change 1
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