FUNCTIONAL DESCRIPTION OF EQUIPMENT
This chapter provides a functional description of the tunable
The circuits are explained to the extent necessary for
general support maintenance.
In addition to the functional description contained herein,
refer to TM 32586501210 for operating instructions for the tunable
The following description references block diagrams, an
interconnection diagram, and schematic diagrams. Block diagrams are
provided in the text or as foldout drawings.
diagram and schematic diagrams are provided as foldout drawings.
Foldout drawings referenced in the text as FOs are located at the
rear of the manual.
This paragraph provides information that applies to the
following functional description.
Logic input/output voltage levels are:
33.1 Logic Levels.
High (true) = +2.4 to 5.5 V dc
Low (false) = 0.0 to +0.4 V dc
33.2 Signal Names. Signal names describe the function performed by
the signal. A signal name with an overbar is read with the prefix
NOT . For example, RESET is read NOT RESET.
If RESET is low (zero
(0) or false), the opposite (RESET) is assumed to be high (one (1) or
Refer to figure 3-1.
The tunable coupler contains separate
control, status, and power distribution circuits. As shown in figure
FO1, motherboard A7 provides interconnections between RF relays K1
and K2, RF switch assembly S2, stepper motor Ml, and the following
circuit card assemblies (CCAs):
Decoder CCA A4
Control logic CCA A3