IBM 3274 51C Maintenance Information page 249

F.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.
Should a diskette drive unit fail (usually indicated by an
1M L failure code of 0010) the CE should only perform the
diagnostic procedures outlined in the MAPs before replac-
ing the drive unit F RU. The CE should perform further
repairs only if he or she is capable of doing so quickly.
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 device hub and
pulley assembly is damaged, the diskette drive should be
exchanged.
e
Clip PN 4240632
Timing Pin
PN 5562019
(storage position)
Figure F-4. 51 TO Special Tools
F-4
F. 1. 1.4 Special Tools
The CE must use the following special tools (shown in
Figure F·4):
• Timing pin
e
(PN 5562019) to adjust or service the
read/write head/carriage stepper motor pulley. (This
part is supplied with each drive.)
• Force gauge
0
(PN 460870) to adjust or service-check
the drive band tension.
• Spring
e
(PN 4240631) to keep the head/carriage in
place against the thickness gauge when performing the
head/carriage adjustments. (This part is supplied with
each drive.)
e
Note: Spring must match view
G.
• Clip
e
(PN 4240632) to keep the thickness gauge in
contact with the track 40 adjustment surface.
Spring PN 4240631