TM 11-6625-1668-12
b. Remove grease, fungus, and ground-in dirt from exterior cabinet surfaces; use a cloth dampened (not
wet) with cleaning compound.
c. Remove dust or dirt from plugs and jacks.
CAUTION
Do not press on the meter or indicator faces (glass or plastic) when cleaning; the faces may
become damaged. Do not clean plastic with alcohol or other solvents; the plastic may
become clouded, or dissolved. Clean front panels carefully; or markings may be erased.
4-10. Troubleshooting Procedure
Troubleshooting of this equipment is based on the preventive maintenance checks and services. To trouble-
shoot the equipment perform each sequence in paragraphs 4-6 and 4-7. If an indication does not appear as
described check the sequence number against the item number in paragraph 4-11 and perform the corrective
measures listed. If the corrective measures listed do not correct the trouble, higher level of maintenance is
required.
4-11. Troubleshooting Chart
Item No
Trouble symptom
probable trouble
Checks and corrective measures
2a ............
POWER lamp does not illuminate.
Defective lamp 1A1DS2 or fuses
Check lamp and fuse continuity, replace
1A2A12F1, 1A2A12F2
if necessary.
2b ............
SIGNAL lamp does not illuminate.
Incorrect control setting, defective lamp
Check lamp fuse and patch cord
1A1DS3, fuses 1A2A12F3, 1A2A12F4
continuity. Replace if necessary.
or patch cord.
2c ............
ALARM lamp does not illuminate
Defective lamp 1A1PS1 or plug-in
Check lamp continuity and substitute a
assembly 1A2A4
known good assembly 1A2A4.
Replace if necessary.
3d ............
POWER lamp does not illuminate.
Defective lamp 2A1DS2 or fuses
Check lamp and fuse continuity, replace
2A2A9F1, 2A2A9F2
if necessary.
3e ............
M and S lamps do not illuminate.
Defective lamps 2A1DS5, 2A1DS6 or
Check lamp continuity, and substitute a
plug in assembly 2A2A3.
known good assembly 2A2A3.
Replace if necessary.
3f .............
OVERFLOW lamp does not illuminate.
Defective lamp 2A1DS3 or plug-in
Check lamp continuity and substitute a
assembly 2A2A5.
known good assembly 2A2A5.
Replace if necessary.
3g ............
CLOCK lamp does not illuminate.
Defective lamp 2A1DS6 or plug-in
Check lamp continuity and substitute a
assembly 2A2A.
known good assembly 2A2A.
4b ............
POWER lamp does not illuminate.
Defective lamp 3A1DS5 or fuses 3A3F1,
Check lamp and fuse continuity.
3A3F2.
Replace if necessary.
7b ............
Analyzer does read 25% switching bias.
Incorrect control settings or defective
Check control settings (paras 4-6, and 4-
plug-in assembly 2A2A3.
character "A". If character is
displayed, substitute assembly 2A2A3
and replace if necessary. If character
is not displayed proceed to item 7d.
7d ............
Oscilloscope does not display the
Incorrect control settings. Defective
Check control settings (paras 4-6 and 4-
character "A".
interface cable or generator plug-in
assembly 1A2A3.
installation of interface cable.
Substitute a known good assembly
1A2A3. Replace if necessary.
7e ............
Analyzer does not read 25% spacing
Incorrect control settings or defective
Check control settings, (paras 4-6 and 4-
bias.
plug-in assemblies 1A2A4, 2A2A3.
assemblies for 1A2A4 and 2A2A3.
4-5
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