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MAINTENANCE
6.
1 INTRODUCTION
This section contains the instructions required to maintain the FDD. The information
is provided in the form of preventive maintenance, trOUbleshooting and corrective
maintenance.
6.2 MAINTENANCE TOOLS
The special tools (or equivalent) required to maintain an FDD are as follows:
DESCRIPTION
Alignment Diskette (Optional)
Outer Stop Gauge
Inner stop Gauge
CDC PART NUMBER
Model 421-51W
83401300
83401400
The standard tools required to maintain the FDD are as follows:
• Socket Wrenches
Sizes: 5/16" (7. 94mm) , 1/4" (6. 35mm) , 3/16" (4. 76mm) , 11/32"
(8. 73mm)
• Allen Wrenches
Sizes: 0.050"
(1.
27mm) , 1/16"
(1.
59mm) , 5/64" (1. 98mm) , 7/64"
(2. 78mm)
• Oscilloscope, Tektronix 335, or equivalent.
• Feeler Gauges, wire
Sizes: 0.030" (0. 762mm), 0.058"
(1.
47mm) , 0.060" (1. 52mm) ,
O.
062"
(1.
58mm) , 0.079" (2. 01mm)
• Feeler Gauge, Shim: 0.072" (1. 83mm)
0.010" (0.254mm)
6.3 PREVENTIVE MAINTENANCE
The head load pad should be inspected after 650 hours of head-load time. If pad is
worn, dirty, torn, or loose it should be replaced.
(See paragraph 6.7.4).
6.4 HEAD CLEANING
On occasions the Read/Write head may require cleaning. If this situation occurs clean
head as follows:
77834769-T
r---------,
t_
CAUTIO~ __
j
Do not smoke while cleaning. Do not touch a head surface with
fingers. Do not leave residue or lint on the head surfaces.
Residual particles can result in a scored disk and/or loss of a
head.
Do not raise head-load arm to the 90-degree position and then
release
it;
damage to the load-arm spring and/or to the head
(core and ceramics) could result.
6-1
6
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