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7925
Maintenance
tion, perform an operational checkout using the appropri-
ate diagnostic tests or the off-line checkout given in
Section IV, Troubleshooting.
To ensure trouble-free operation, the disc drive should be
kept free of unusual amounts of contaminants. When the
results of an inspection indicate that excessive amounts of
smoke, dust, oil vapor, or other foreign matter are present,
a general cleaning is required. Refer to table 2-1 for the
appropriate cleaning materials, ensuring that only the
specified brands and types are used.
Before performing any or all of the preventive mainte-
nance routines given in table 2-3 and in the preventive
maintenance procedures, perform the following prelimi-
nary steps:
FUNCTION 8 -
MANUAL.
This function is used to
operate the disc drive manually. Tag bus commands are
entered by toggle switches TO through T3. Head selection
is accomplished with switches H8 (Cll), H4, H2, and HI,
and sector is selected using switches labeled S32, S16, S8,
S4, S2, and S1. When the START pushbutton is pressed
the operation begins. Indicator LED's CO through C15
display the state of the control bus. The tag bus commands
are listed on the front panel of the DSU and described in
Section I, Theory of Operation. Also, the control bus func-
tions are described in section
1.
2-10.
PREVENTIVE MAINTENANCE
Table 2-3 provides preventive maintenance routines for
the disc drive. These routines are to be performed every
six months. However, if the disc drive is installed in an
environment that contains abnormal amounts of dust,
smoke, oil vapor, or other foreign matter, the routines
should be performed more frequently.
Preliminary steps are included to provide guidelines for
preparing the disc drive for service. References are made
to Section V, Removal and Replacement, for any dis-
assembly that is required. In addition to the routines con-
tained in table 2-3, detailed preventive maintenance pro-
cedures are also included.
When the preventive maintenance has been completed
and the disc drive has been restored to an operating condi-
2-11.
2-12.
GENERAL CLEANING
INFORMATION
PRELIMINARY STEPS
WARNING
This disc drive does not contain
operator-serviceable parts. To pre-
vent electrical shock, refer all instal-
lation and maintenance activities to
service-trained personnel.
ITEM
Absolute Filter and Prefilter
Data and Servo Heads
Head Cables and Connectors
Carriage Rails and Bearings
Spindle and Pack Chamber
Table 2-3. Preventive Maintenance Routines
ROUTINE
Measure absolute filter output air pressure. Refer to paragraph 2-13. Re-
place as necessary. (Refer to Section V, Removal and Replacement.)
Inspect for contamination. (Refer to figure 2-6.) Clean as necessary.
(Refer to paragraph 2-15.)
Inspect for looseness and/or damage. Replace as necessary.
Clean as required. (Refer to paragraph 2-16.) Inspect bearings for exces-
sive wear and ease of operation.
Remove all foreign particles and clean as necessary. (Refer to para-
graph 2-17.)
Spindle Ground Contact and Spring
Power Supplies
Mainframe Switches and Solenoids
Alignment of all adjustable parameters
Indicators
Pack Lock Lubrication
Inspect spindle ground contact and spring for excessive wear and/or
looseness. Replace as necessary.
Check all power supply voltage values. (Refer to paragraph 4-3.)
Inspect for proper operation. (Refer to Section III, Alignment and
Adjustment.)
Check alignment of all adjustable parameters. If necessary, adjust. (Refer
to Section III, Alignment and Adjustment.)
Inspect for proper operation. Replace as necessary. (Refer to Section V,
Removal and Replacement.)
Perform the pack lock lubrication procedure. (Refer to paragraph 2-14.)
2-7
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