Maintenance - IBM 3274 51C Maintenance Information

E.1.1.3 Maintenance
The diskette drive needs no planned maintenance. The
MAPs guide the CE in diagnosing diskette drive failures;
the MAPs also send the CE to maintenance procedures in
this appendix when an adjustment, service check, or F RU
replacement 'is needed.
The CE should verify a repair online using the system or
device diagnostic programs.
The head/carriage assembly and the drive hub and pulley
assembly are adjusted and tested at the factory. The head/
carriage assembly can be exchanged in the field; the drive
hub and pulley assembly cannot be exchanged in the field.
If the track 40 adjustment surface or the drive hub and
pulley assembly is damaged, the diskette drive should be
exchanged.
o
Force Gauge
Part 460870
\
Timing Pin
Part 5562019
(storage posif~n)
Figure E·4. 31 SO Special Tools
E-6
E.1.1,4 Special Tools
The CE must use the following special tools (shown in
Figure E-4):
• Timing pin
e
(part 5562019) to adjust or service the
read/write head/carriage stepper motor pulley. (This
part is supplied with each drive.)
• Force gauge (part 460870),
G '
to adjust or service-
check the drive band tension.
• Spring (part 4240631),
CD '
to keep the head/carriage
in place against the thickness gauge when performing
the head/carriage adjustments. (This part is supplied
with each drive.)
Note: Spring must match view,
G-
• Clip (part 4240632),
e '
to keep the thickness gauge
in contact with the track 40 adjustment surface.