HP 7970B Operating And Service Manual page 3

Description
1-20. BASIC AND OPTIONAL ASSEMBLIES.
1-21. The tape unit is available in a variety of configura-
tions. Regardless of tape speed, the following assemblies are
basic and applicable to all tape units.
a. Transformer Assembly.
b. Photosense Assembly.
c. Tension Assemblies (two).
d. Capstan Assembly.
e. Reel Motor Assemblies (two).
f. Reel Servo Printed-Circuit Assembly.
g. Capstan Servo Printed-Circuit Assembly.
h. Control and Status Printed-Circuit Assembly.
1-2
7970Bj7970C
i. Power Distribution Assembly.
j. Power Regulator Printed-Circuit Assembly.
1-22. The control switch assembly is a basic assembly;
however, if the tape unit is equipped with write data cir-
cuits, the control switch assembly wHi contain the write en-
able indicator.
1-23. The following assemblies are optional and, depend-
ing upon the use of the tape unit, mayor may not be a part
of the tape unit.
a. Write Enable Assembly.
b. Density Select Assembly.
c. Unit Select Assembly.
Part 2