Section IV
Paragraphs 4-12 to 4-14
AN-G-25 GREASE
NOTE
Amount
Location
Part
In the event that tubes are changed, check the
associated circuit functioning for proper align-
Dynamotor
Each end of unit
Small amount
ment. Univerter tube changes may consider-
See par. 7-22
ably affect univerter alignment due to the high
Section VII
frequencies involved.
Attenuator
(10) figure 7-5
Small amount
on gear teeth
Spur Gear
Small amount
(5) figure 7-5
Attenuator
Do not remove tubes with power applied to the
on top and
plunger drive
equipment. Heaters are wired in various
sides
rack
series - parallel combinations and removal of
one tube may overload and burn out other
AN-O-4 OIL (AN-O-6A, Alternate)
heaters. See figures 9-1 and 9-2 for heater
circuits,
Amount
Part
Location
CARRIER SET
(6) figure 7-1
4-14. REPLACEMENT OF FUSES.
One drop if
binding or
control shaft
a. The power input line is protected by two 10 amp
squeaking
bushing
fuses mounted on the front panel. To remove, turn
occurs.
cap to unlock and pull fuse from holder.
(7) figure 7-1
Attenuator
One drop if
MICROVOLTS
binding or
control shaft
squeaking
bushing
occurs
Never replace a fuse with one of higher rating
(8) (9) figure 7-2
R-f slug rack
One drop
unless continued operation is of such impor -
oil retaining
tance as to warrant possible damaging of the
felt was hers
equipment.
(12)(13) figure
One drop if
Attenuator
7-5
binding or
Spur Gear
b. If a replaced fuse blows immediately, investi -
squeaking
shaft
gate circuits before further replacement.
occurs
g. Check alignment of the r-f and audio sections
as outlined in Section VIII and realign where necessary.
(Refer to minimum performance standards in Section
VI, paragraph 6-20. )
h. With chassis covers replaced, secure chassis
in case and perform the intermediate inspection as
outlined in paragraph 4-3 above.
4-12. SPECIAL INSPECTION. (2000 hours)
a. Replace all tubes in the equipment.
b. Perform the Major Inspection as outlined in
paragraph 4-12 above.
4-13. REPLACEMENT OF VACUUM TUBES.
a. All tubes are of the miniature type. Remove by
pulling straight out of socket, taking care not to bend
the base pins. See figure 4-1 for tube location.
b. Thoroughly test a suspected tube before dis -
carding. If replacement tube does not correct opera-
tion, always re-insert the original tube.
20
