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Equipment Performance Checklist (Cont)
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TM-11-5815-206-12 Teletypewriter Sets AN/PGC-1 AND AN/PGC-3 and Teletypewriters TT-4A/TG TT-4B/TG TT-4C/TG TT-335/TG TT-537/G TT-698/TG Manual
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Replacement Lubrication Schedule
TM 11-5815-206-12/ TO 31W4-2PGC1-61
b. Fuse Replacement.
4-9. Replacement of Lamp and Fuses
(1) Lift the front door (fig. 1-7).
a. Lamp Replacement.
(2) Press the fuse cap (fig. 3-1) inward, turn
(1) Remove the dust cover (para 3-5a).
the cap slightly to the right, and pull the cap and
(2) To remove the lamp, press the lamp into its
fuse from the fuseholder.
socket in the dust cover, turn the lamp slightly,
(3) Insert the new fuse in the fuseholder and
and pull it from the socket.
replace the fuse cap.
(3) Insert the new lamp into the socket, press
CAUTION
and turn the lamp slightly to secure it firmly in the
Be sure to install only fuses of the correct
socket
current rating (para 2-5) in the fuseholders.
(4) Replace the dust cover. Be sure to
reconnect the dust cover ground leads (fig. 1-7).
4-10. Troubleshooting Chart
Corrective action
Probable cause
Malfunction
Replace fuse (para 2-5 and 4-9b).
Ac power fuse blown. Failure of
1. Motor fails to start.
Correct defect or use another power
power source.
Connect power cm-d.
Power cord not plugged in.
2. No power.
Replace lamp (para 4-9a).
Defective copy lamp.
3. Copy lamp does not light.
Correct or request higher category of
Check for faulty ground.
4. Shock from equipment.
maintenance (para 2-3e).
Worn brushes.
Request higher category maintenance
5. Motor runs but speed is erratic.
Inspect spool for proper seat. Replace
Ribbon spool not seated correctly on
6. Ribbon does not feed or does not
ribbon or request higher category
driving collar spring tension on
reverse.
maintenance (para 3-6).
ribbon feed clutch. Ribbon spool
gears not meshing.
Check fuses (para 4-9b).
Fuses blown.
7. Loss of all functions in set.
Request higher category of main.
Inspect for lubrication.
8. Mechanical binding.
tenance (para 4-2).
Inspect print pallets for dirt.
Clean with cleaner (para 4-7).
9. Poor print quality.
Inspect  for correction or request
Blown fuse, broken wire, or defective
10. Running open (high level units)
higher category of maintenance.
motor stop switch.
External signal line open or shorted.
Inspect  for correction or request
11. Running open (low units).
higher category of maintenance.
Reverse input signal line leads.
Space instead of mark impulses
received.
Check motor speed.
Motor speed incorrect.
12. Receiving unit operates, bu
mea-
Request higher category of main-
(range-finder
Selector  mechanism  improperly
range
tenance.
adjusted.
surement is narrow.
Request higher category of main-
tenance.
improperly adjusted.
Request higher category of main-
Transmitter contacts (high level
tenance.
units) or contact assembly (low
level units) out of adjustment.
Request higher category of
main-
Friction clutch dry or out of ad-
13. Transmitter Mechanism trans-
tenance.
justment.
mits garbled copy.
Request higher category of
main-
Transmitter contacts dirty or out of
tenance.
adjustment (high level units).
Request higher category of
main-
Transmitter contact assembly out of
tenance.
adjustment (low level units).
Request higher category of
main-
Contact bail spring weak (high level
tenance.
units).
Reconnect (para 2-6d and e).
Keyboard transmitter plug discon-
nected.
Release keyboard lock.
Key-levers blocked.
Request higher category of main-
Check for lubrication.
14. Binding or noisy.
tenance.
Replace or connect.
Locking lever latch spring broken or
rotates
15. Transmitter  camshaft
disconnected.
continuously.
Replace or connect.
Repeat-blocking-lever spring broken
or disconnected.
The  3 0 V d c power supply is
Request higher category of main-
16. Motor runs but no transmission
tenance.
inoperative.
from keyboard, and page
printer does not print.
4-7

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