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Diagrams
12·1.
INTRODUCTION
This chapter contains electrical and mechanical
diagrams for the drive. These provide details of
drive dimensions, air circulation, the location of
components within the drive, signal and power dis-
tribution, and functional block diagrams.
12·2.
DIMENSIONS
The dimensions of the drive and the HP 19511 A
Cabinet are shown in figures 12-1 and 12-2,
respectively.
12·3.
AIR CIRCULATION
The path of the cooling air circulated by the
squirrel-cage fan in the drive is shown in figure
12-3.
12·4.
ASSEMBLY LOCATION
Figure 12-4 shows the locations of the major
electronic assemblies and parts in the drive. These
include:
servo PCA-Al
read/write PCA-A2
head-disc assembly A3
power supply PCA-A4
power distribution PCA-A5
controller PCA-A6
LED PCA-A7
primary power PCA-AS
spindle motor B 1
line filter FLI
12·5.
SIGNAL DISTRIBUTION
Due to the number of assemblies, multi-pin con-
nectors, and interconnecting cables in the drive, it
is impractical to provide a detailed signal distribu-
tion drawing for the drive in a single diagram.
Instead, a simplified overall cabling diagram for
12
the drive is supplied, followed
by separate
drawings which show the input and output signals
at the connectors of each assembly in the drive
and details of the interconnecting cables.
Two
tables also provide additional signal distribution
information.
This signal distribution documentation consists of
the following tables and figures:
• Table 12-1. An alphabetical listing of the sig-
nal mnemonics used in the parts location and
connector pinout drawings, together with the
source and destination for each signal. Refer
to table 5-1 for a description of the signal
functions.
• Table 12-2. A listing of the dc voltages
shown in the parts location and connector
pinout drawings, together with the source
and destination of the voltages.
Output
specifications for the voltages are also given.
NOTE
In tables 12-1 and 12-2, where a multiple
destination is given for a signal, this in-
dicates that the signal is routed through
a number of assemblies before it reaches
its final destination.
The destinations
are listed in order, from the one nearest
the source (first) to the final destination
(last). In both tables:
Al
=
servo PCA-Al
A2
=
read/write PCA-A2
A3
=
head-disc assembly A3
A4
=
power supply PCA-A4
A5
=
power distribution PCA-A5
A6
=
controller PCA-A6
A7
=
LED PCA-A7
AS
=
primary power PCA-AS
•
Figures 12-5 through 12-11. Drawings which
provide details of cable assemblies WI
12-1
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