User's Manual

Innovator™ HX Series Digital Chapter 4, Circuit Descriptions,
UHF Transmitter Control/Exciter Cabinet Assemblies
Volume 1, Rev. 0 4-3
this circuit is operational, the Green LED
DS4, mounted on the board, will be lit
PS5 protects the +12 VDC 2 Amp
circuits for the Upconverter through J62
pins 17, 18, 19 and 20. If this circuit is
operational, the Green LED DS5,
mounted on the board, will be lit
PS6 protects the +12 VDC 2 Amp
circuits for the Remote through J63 pins
17, 18, 19 and 20. If this circuit is
operational, the Green LED DS6,
mounted on the board, will be lit
4.2.1.1.2 -12 VDC Circuits
-12 VDC from the Switching Power
Supply Assembly connects to J5 on the
board. The -12 VDC is divided into two
separate circuits each with a 3 amp self
resetting fuse, PS1 and PS2.
PS1 protects the -12 VDC 2 Amp circuits
for the System through J63 pins 1, 2, 3
and 4. If this circuit is operational, the
Green LED DS1, mounted on the board,
will be lit
PS2 protects the -12 VDC 2 Amp circuits
for the Remote through J62 pins 1, 2, 3
and 4. If this circuit is operational, the
Green LED DS2, mounted on the board,
will be lit
The connections from J62 and J63 of the
Power Protection Board are wired to J62
and J63 on the Control Board.
4.2.1.2 (A3) Control Board (1302021;
Appendix D)
The control monitoring functions and
front panel operator interfaces are found
on the Control Board. Front panel
operator interfaces are brought to the
control board using a 26 position
conductor ribbon cable that plugs into
J60. The control board controls and
monitors the Power Supply and Power
Amplifier module through a 16 position
connector J61 and two 20 position
connectors J62 & J63.
4.2.1.2.1 Schematic Page 1
U1 is an 8 bit RISC microcontroller that is
in circuit programmed or programmed
using the serial programming port J4 on
the board. When the microcontroller, U1,
is held in reset, low on pin 20, by either
the programming port or the external
watchdog IC (U2), a FET Q1 inverts the
reset signal to a high that connects to the
control lines of U5, an analog switch. The
closed contacts of U5 connect the serial
programming lines from J4 to U1. LED
DS10 will be lit when programming port J4
is used.
U2 is a watchdog IC used to hold the
microcontroller in reset, if the supply
voltage is less the 4.21 VDC; (1.25 VDC <
Pin 4 (IN) < Pin 2 (Vcc). The watchdog
momentarily resets the microcontroller, if
Pin 6 (ST) is not clocked every second. A
manual reset switch S1 is provided but
should not be needed.
Diodes DS1 through DS8 are used for
display of auto test results. A test board
is used to execute self test routines.
When the test board is installed,
Auto_Test_1 is held low and Auto_Test_2
is allowed to float at 5 VDC. This is the
signal to start the auto test routines.
U3 and U4 are used to selectively enable
various input and output ICs found on
pages 2 & 3 of the schematic.
U1 has two serial ports available. In this
application, one port is used to
communicate with transmitter system
components where U1 is the master of a
RS-485 serial bus. The other serial port is
used to provide serial data I/O where U1
is not the master of the data port. A dual
RS-232 port driver IC and a RS-485 Port
driver are also in the second serial data
I/O system. The serial ports are wired
such that serial data input can come
through one of the three serial port
channels. Data output is sent out through
each of the three serial port channels.