TM 11-6625-596-12
maintenance checks and services chart (para 3-4) and
4-4.
Touchup Painting Instructions
proceed through the items until an abnormal condition or
Remove rust and corrosion from metal surfaces by
result is observed. When an abnormal result is
lightly sanding them with fine sandpaper. Brush two thin
observed, note the item number and turn to the
coats of paint on the bare metal to protect it from further
corresponding item number in the trouble- shooting
corrosion.
chart below. Perform the checks and corrective actions
4-5.
Troubleshooting Chart
and 4-2 may be used to locate items designated in the
Troubleshooting this equipment is based on the
chart by reference symbol, and which are mounted
operational check contained in the daily preventive
behind the front panel or on the chassis. If the
maintenance checks and services chart.
To
corrective measures indicated do not result in correction
troubleshoot the equipment, perform all functions
of the trouble, higher category maintenance is required.
starting with sequence No. 9 in the daily preventive
Item No.
Trouble symptom
Probable trouble
Corrective measure
12
POWER ON indicator does
a
POWER ON indicator defective-
a
Replace lamp 1A4DS2 (para 46a).
b.
Line fuse defective.
b.
Replace fuse 1A4F2, F3, F4, or F5,
not light.
c
Powerline cable has loose or
c. Check attachment of cable wires to
broken conductor from ter-
plug terminals; attach and tighten. Re-
minal of plug.
turn to higher category maintenance
for repair.
d No line voltage.
d Check voltage at outlet receptacle
used.
13
Meter pointer cannot be set
a. Printed-circuit boards 1A3A3,
a Check setting of connector P1 on each
to red mark at midscale.
A4, A6, and A8 not properly
printed-circuit board with mating re-
mounted.
ceptacle.
b
Pushbutton switches 1A4S6
b. Return to higher category
and S5 defective
maintenance
for repair.
14
Meter pointer cannot be set
a. Printed-circuit board 1A3A2
a. Check seating of connector J1
printed-
to red mark at midscale.
not properly mounted.
circuit board A2 with mating recep-
tacle.
b.
Pushbutton switch defective.
b. Same as for item 13b.
15
Meter reads other than zero.
Pushbutton switch defective.
Same as for item 13b.
16
Meter reads lea than 30, and
a
Assemblies 1A3A6 and A8
a
Same a for item 13a
not properly mounted.
buzz.
b. Pushbutton switch defective.
b. Same as for item 1b.
17
Meter will not read on green
a. Assemblies 1A3A7 and A8
a. Same as for item 13a
scale.
not properly mounted.
b. Pushbutton switch defective.
b. Same a for item 13b.
18
Meter will not read on green
Pushbutton switch defective.
Same as for item 13b.
19
Meter will not read on green
Pushbutton switch defective.
Same as for item 13b.
20
Meter will not read on green
Pushbutton switch defective
Same as for item 13b
scale
21
Meter will not read on green
Pushbutton switch defective.
Same as for item 13b.
22
Meter will not read on green
a.
Loose or corroded connec-
a.
Check all connections of
loudspeaker
scale.
tions to loudspeaker.
cable; if loose, tighten. Return to
higher maintenance category for fur-
ther repair.
4-4