Replacement of Lamp and Fuses

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.

source (para 1-5).

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.

(para 2-8).

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-

Keyboard transmitter friction clutch

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