IBM System/360 2050 User Manual

stop indicator comes on. The master check indicator·
is not set. To determine the failing address, sub-
tract one from the ROS address indicated in SDR
(19-30) The force indicator switch must be used to
get the proper indication from the switchable indi-
cators.
ROS BIT PLANE REMOVALS AND ADJUSTMENTS
ROS Bit Plane Adjustments
The pressure screws in the spider assemblies must
be checked for minimum torque of 4. 5 inch-pounds
every 90 days. Use the torque screwdriver (P/N
461450) to carry out the adjustment procedure that
follows:
1. Following the sequence shown in Figure 94
check the torque on setscrews 1 through 8, 11, and
12 for 4. 5 inch-pounds. Use torque wrench listed
above.
Note: Make sure the torque wrench has been
recently calibrated. This wrench must be calibrated
periodically.
2. Check the torque on setscrews 9 and 10 for
3. 5 inch-pounds (Figure 94).
3. After completing steps 1 and 2, check the
torque in the same sequence indicated in Figure 94 to
see that torques for positions 1-8, 11 and 12 arewith-
in 4. 0 to 5. O inch-pounds and that torques for positions
9 and 10 are within 3. 0 to 4. 0 inch-pounds. If the
torques are not within specifications, re-torque as
described above.
4. Repeat steps 1-3 until the specifications are
met.
11
12
1 2
--
3 4
5
6
7
8
9
10
FIGURE 94. SETSCREWS TORQUE SEQUENCE (ROS BIT PLANES)
100 (3/71) Model SO FEMM
ROS Bit Plane Removal
Caution
Use extreme caution when handling bit plates;
they are easily damaged.
1. Release pressure on the 12 pressure pads
by loosening the setscrews bearing on the center of
each pad. Use a standard bristol wrench or a torque
wrench (P/N 461450). Do not loosen slotted-head
screws that are located toward the center of the
casting assembly.
2. Release pressure from upper and lower
drive connectors by loosening the four spring-loading
screws in each connector. Do not disengage screws
completely.
3. Remove the four corner hex-head screws and
two center knurled nuts and remove spider assem-
bly from two center studs. (The knurled nuts may
be removed by hand.)
4. Remove rubber pressure pad from center
studs.
5. Remove upper and lower drive connectors by
removing two screws at the end of each conneetor.
Note: Plastic or lint-free gloves must be worn
when handling bit planes.
6. Carefully remove the bit plane from align-
ment pins and studs by holding at center of each of
the horizontal edges. The plane must be held and
gently lifted out without being allowed to bow.
Caution
Exercise extreme care in handling the bit plane
to avoid creasing, folding, or scratching.
7. Cleanliness of the sense and bit planes is
very important. Perform the following cleaning
procedure before installing the bit plane.
Note; Elapsed time between cleaning the sense
lines and bit planes and installing the bit planes,
rubber pressure pad, and spider assembly must be
kept to a minimum.
ROS Bit Plane Cleaning
New bit planes are stored in an IBM-approved poly-
ethylene bag. The bag must not be opened until just
before the bit plane is to be installed. If the bag is
opened or damaged prior to installation the bit plane

IBM System/360 2050 Specifications

General

Brand	IBM
Model	System/360 2050
Category	Computer Hardware
Language	English