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2.1
LEADING PARTICULARS
Maintenance features of the mM
2310
Disk Storage
Drive include switches and controls which permit
the CE to check and monitor operating character-
istics of the machine in a read select mode during
maintenance.
A CE disk cartridge is used by the Customer
Engineer for radial alignment of read/write heads,
and circumferential adjustment of the sector trans-
ducer.
Special tools are available at the branch-office
level to properly service the machine and its com-
ponents. A special Disk Cartridge Cleaning Fixture
is used to clean read/write surfaces of the disk.
A Disk Run Out Fixture is used to measure vertical
deflection of disk surfaces
0
2.2 CE DISK CARTRIDGE
The CE disk cartridge (P /N
2200001)
can be identi-
fied by its red access door. (Customer disk car-
tridges are white all over.) The CE disk cartridge
has three pre-recorded tracks on each side
of
the
disk. These tracks are used for head-alignment
tracking adjustment (track
100)
and sector index
timing adjustments (track 095). The third track,
which checks detent spacing (track 105), is provided
for future use and is not to be used for maintenance
purposes. Care must be taken not to damage the
pre-recordings contained on these tracks. Allowance
is made for protection of CE tracks by avoidirg the
use of tracks 90 through 110. Any other tracks may
be used by the CE for read/write maintenance
applications.
The alignment of read/write heads is accom-
plished by using CE Track
100
which consists of two
tracks. One of the tracks is written outboard from
track
100,
and the other is written inboard from
track
100
so that eccentricity is built into the track.
The two tracks are written with a clock pattern of
all zeros at a frequency of
720
KC. Read/write
heads are adjusted to read equal amplitudes of the
two eccentric tracks. (Section 4. 17. 1)
227 -5984 (9/65)
CHAPTER 2 MAINTENANCE FEATURES
The index timing is adjusted by the use of CE
track 095. A burst of bits and an index pulse is
recorded on this track. The sector transducer is
. positioned radially about the spindle so that a time
delay of
30
(±5) fJ.sec exists between the reference
burst for an all-bits pattern and presentation of the
index pulse.
2.3
CE CONTROL PANEL
A CE control panel located on back of the equipment
(Figure
2-1)
is provided to permit limited operation
of the disk storage drive independent of the using
system, except for power input. The CE switches
located on the panel are normally inoperative and be-
come active only when the CE Interlock signal cable
between the using system and the disk storage drive
is disconnected.
Disconnecting this cable, places the machine in
a Read Select mode. The CE can examine the read
circuit and recorded data without the possibility of
erasing recorded information.
2.4 CE SWITCHES
Four CE switches are provided on the CE panel;
Head Select switch, Step Mode switch, Direction
switch, and Step Control switch. No CE control is
provided on the
2310
for writing information.
2. 4. 1 Head Select Switch
The Head Select switch controls the selection of heads
so that the CE may examine read Signals originating
from either head. This switch determines which of
the two heads is in use, and is particularly useful
when aligning heads to a CE cartridge. The switch
has two positions, labeled 0 and 1, which correspond
with the upper and lower read/write head.
2.4.2 Step Mode Switch
The Step Mode switch controls the actuator stepping
mode by determining the distance to be traversed by
2.1
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