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Page Title:
SECTION IV. OPERATIONAL CHECKOUT |
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 TM 55-4920-415-13&P
SECTION IV. OPERATIONAL CHECKOUT
3-12. Vibrator Motor Does Not Operate.
3-9. General. This section lists the most probable
failures that may occur to the gyro tester and the most
Probable Cause
Remedy
probable cause. The remedy recommended is listed
opposite the probable cause.
a. Defective motor
Report malfunction to
Intermediate Maintenance
b. Dirty slip rings
Report malfunction to
3-10. Fork Will Not Rotate.
Intermediate Maintenance
c. Defective vibration
Report switch (par. 3-16)
Probable Cause
Remedy
motor switch
a.
Burned out fuse
Replace fuse (par. 3-17)
d.
Burned out fuse
b.
Defective drive motor
Report
malfunction
to
Replace fuse (par. 3-17)
control unit
Intermediate Maintenance
3-13. Indicator Lights Do Not Glow
c.
Defective rotation
Replace switch (par. 3-16)
switch
d.
Defective slip clutch
Report malfunction to
Probable Cause
Remedy
Intermediate Maintenance
a. Defective lamp
Replace lamp (par. 3-18)
e. Defective drive motor
Report malfunction to
b. Defective switch
Replace switch (par. 3-15 &
Intermediate Maintenance
f. Defective rotational
Replace switch (par. 3-15)
rate switch
3-11. Fork Rotational Rate Inconsistent With Switch
Setting.
Probable Cause
Remedy
a. Defective drive motor
Report malfunction to control
unit
Intermediate Maintenance
b. Defective rotational
Replace switch (par. 3-15)
rate switch
c. Misadjusted rotational
Adjust potentiometer
rate
potentiometer
SECTION V. REPAIR AND REPLACEMENT
3-16. Rotation and Vibration Switches.
consists of the drive motor, vibration motor, motor
control unit, rotational rate potentiometers, slip ring,
a. Removal.
lamps, fuses and various switches. The power cable
(1) Tag and disconnect the electrical wires
connects to a standard 115 volt ac power outlet. Refer
from switch (25, 22).
to electrical diagram in Figure 1-2.
(2) Loosen set screw that secures knob.
3-15. Rotational Rate Switch.
(3) Remove hex nut and lock washer that
a. Removal.
secures switch in control panel.
(1) Tag and disconnect the electrical wires
b. Replacement.
from switch (26, Figure 2-1).
(1) Position switch in control panel (29) and
(2) Loosen set screw that secures knob.
replace washer and hex nut.
(3) Remove hex nut and lock washer that
(2) Secure knob with set screw.
secures switch in panel.
(3) Replace electrical leads.
b. Replacement.
(1) Position switch in control panel (29) and
replace washer and hex nut.
(2) Secure knob with set screw.
(3) Replace electrical leads.
3-3
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