IBM 3274 51C Maintenance Information page 283

F.3.3.7 Solenoid and Idler Removal (Figure F-30)
1. Power down.
I
DANGER
Voltage is still present at the socket when the power
cable is disconnected.
2. Disconnect the ac drive motor power cable
e .
~.
Insert a strip of clean paper between the two heads.
4. Turn the operator knob
G
to the closed position.
5. Loosen the lever screw
0 .
6. Push the bail
0
inward slightlY, and disconnect the
cable eyelet
G
from the bail lever
0 .
7. Turn the operator knob
G
to the open position.
8. Remove the ac motor drive belt
6) .
9. Remove the solenoid cable connector
G
from the
control card.
10. On all domestic machines or World Trade machines,
prior to EC 841505, remove the solenoid, the bracket,
and the cable as a unit
CD.
On World Trade machines
with EC 841505 and later, skip this step.
11. Loosen the solenoid locking setscrew
e
and unscrew
the solenoid from the bracket. (The solenoid and the
bail actuator cable are exchanged as a unit.)
F-40
F.3.3.8 Solenoid and Idler Replacement (Figure F-30)
1. On all domestic machines or World Trade machines,
prior to EC 841505, reinstall the solenoid
CD
on the
bracket and tighten the solenoid locking setscrew
CD
On World Trade machines with EC 841505, and later,
reinstall the head load solenoid
CD
on the casting and
tighten the solenoid locking setscrew
CD .
2. On all domestic machines or World Trade machines
prior to 841505, reinstall the solenoid, bracket, and
cable asa unit. On World Trade machines with
EC 841505 and later, skip this step.
3. Reconnect the head load solenoid cable connector
0
to the control card.
4. Reinstall the ac motor drive belt
6) .
5. Turn the operator knob
G
to the closed position.
6. Push the bail
0
inward slightly, and connect the cable'
eyelet
CD
to the bail lever
0
with the eyelet crimp
o
facing outward. (Ensure that the cable remains
on the pulley and is not twisted; turn the solenoid
plunger
0
if necessary.)
7. Turn the operator knob
0
to the open position.
8. Remove the strip of paper from between the heads.
9. Perform the Head Gap Adjustment (see paragraph
F.3.3.3).
10. Perform the bail adjustment (see paragraph F .3.3.4).