Table of Contents
Advertisement
Functional Description
7936 and 7937
Primary power
PCA-AB
contains the drive LINE-
switch and the spindle motor start capacitor and
control relay. Also mounted on
PCA-AB
are con-
nectors that facilitate the changeover of the
spindle motor wiring when the drive power con-
figuration is changed from 90-132 Vac to
IBO-264
Vac, or vice versa.
5-2.
BLOCK DIAGRAMS
A basic block diagram (figure 5-16) for the con-
troller and drive electronics is provided in this
chapter. Functional block diagrams (figures 12-20
through 12-23) for the servo, read/write, spindle,
and power supply systems within the drive are lo-
cated in chapter 12. A functional block diagram
for the two HP-IB controllers available for use in
the drive is contained in Appendix A at the rear of
the manual.
In order to facilitate text and table references to
the functional block diagrams in chapter 12 and
the appendixes, each diagram is identified by two
large characters in the lower right-hand corner of
the page.
For example, the read/write system
diagram is identified with the characters
RW.
These characters are boxed in the text and tables
thus:
~.
The diagrams are identified as follows:
CR
=
Figure A-3, Controller, Functional Block
Diagram, in Appendix A.
NOTE
Appendix A describes the two HP-IB
controllers available for use in the drive.
Refer to figure A-3 when
Ii
is used in
this chapter to identify the functional
block diagram for controller PCA-A6.
S1
=
Figure 12-20. Servo System, Functional Block
Diagram (Sheet 1 of 2)
S2
=
Figure 12-20. Servo System, Functional Block
Diagram (Sheet 2 of 2)
RW
Figure
12-2l.
Read/Write
System,
5-2
Functional Block Diagram
NOTE
The numbers which identify the test
points in the servo and read/write func-
tional block diagrams are the pin num-
bers on the read/write and servo test
PCAs. Refer to chapter B for details.
SO
= Figure
12-22. Spindle
Drive
System,
Functional Block Diagram
PS
=
Figure
12-23. Power Supply
System,
Functional Block Diagram
5-3.
SIGNAL NOTATION
In the controller and drive logic circuits, a digital
signal is applied to its destination in one of two
states: active or inactive. The signal is active when
its voltage level (high or low) makes the action oc-
cur for which the signal was designed. This action
is usually identified by a signal mnemonic.
A
mnemonic with an "-L" suffix indicates a logic sig-
nal with an active low voltage level. A mnemonic
with an
"-H"
suffix indicates a logic signal with an
active high voltage level.
Signal mnemonics
without an "-L" or "-H" suffix usually indicate
analog, data bus, or control bus signals.
5-4.
LIST OF MNEMONICS
The mnemonics used in the functional block
diagrams and accompanying text are defined in
table 5-l. The SOURCE column of table 5-1 gives
the identification characters f or the functional
block diagram where the signal appears, followed
by the number of the assembly where the signal
originates.
The following assembly numbers appear in the
SOURCE column of table 5-1:
A1
=
Servo PCA-Al
A2
=
Read/Write PCA-A2
A3
=
Head-Disc Assembly A3
A4
=
Power Supply PCA-A4
Advertisement
Table of Contents
