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TM 55-4920-412-13&P
Table 4-2. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. INPUT POWER INDICATORS DO NOT GO ON WITH INPUT POWER SWITCH PLACED ON.
Step 1.Place INPUT POWER switch ON. INPUT POWER 115 VAC and 28 VDC indicators should go on.
a.
both indicators do not go on, forward BTS to higher maintenance.
b.
only one indicator does not go on, check/replace corresponding fuse, paragraph 4-7.
c.
fuse is good, replace lamp, paragraph 4-9.
2. INDICATORS DO NOT GO ON WHEN LAMP TEST SWITCH IS PRESSED.
Step 1.Press LAMP TEST SWITCH. On sensor simulator:LOW OIL PRESS NO. 1 and NO. 2, HIGH OIL TEMP NO. 1
and NO. 2, ENGINE OUT NO. 1 and NO. 2, LAMP SUPPLY OVERLOAD NO. 1 and NO. 2, and LOW ROTOR
SPD indicators should go on. On unit tester ROTOR SPEED, ENG 1 OUT, ENG 2 OUT, OIL 1 PRESS, OIL 2
PRESS, OIL 1 TEMP, TEST FREQ ANA, TEST FREQ DIG, INT, LIGHT SENSING A, SENSING B, ANALOG
A, ANALOG B, DIGITAL A, DIGITAL B, SHIFT REG, MUX ANALOG, DIGITAL O/P, MUX DIGITAL, ROTOR
OVERSPEED 127%, 137%, 142%, and FAIL WARN indicators should go on.
a.
If no indicators go on, forward BTS to higher maintenance.
b.
If only unit tester indicators do not go on, forward interconnect cable to higher maintenance.
c.
If only one indicator does not go on, replace lamp, paragraph 4-9.
Section III. REPAINTING AND REFINISHING INSTRUCTIONS
WARNING
Observe all cautions and warnings
on
containers
when
using
consumables. When applicable, wear
necessary protective gear during
handling and use. If a consumable is
flammable
or
explosive,
MAKE
CERTAIN consumable and its vapors
are kept away from heat, spark, and
flame. MAKE CERTAIN helicopter is
properly grounded and firefighting
equipment is readily available prior to
use.
4-4. Cleaning Instructions.
a. Remove dust and loose dirt with a clean, soft cloth,
item 4, App D.
b. Remove grease, fungus, and ground-in dirt with
cloth dampened with dry-cleaning solvent, item 3, App
D.
c. Remove moisture with a dry cloth.
4-5. Repainting and Refinishing Instructions.
NOTE
Refer to TB 746-10, Field Instructions
for
Painting
and
Preserving
Electronics Equipment.
a. Repaint test set using these colors:
(1)
Case (exterior). Finish with two coats of baked
enamel colored grey, item 1, app D.
(2)
Front panel. Retouch using enamel colored
instrument black, item 2, App D.
4-2
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