User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD Board Descriptions
ATSC Transmitter/Regenerative Translator
Instruction Manual, Rev. 1 63
making process, U7 does that. Rather, it is layered on top of U7 and is the EPLD's
interface to the outside world. Information is passed between the microcontroller and
the EPLD. The microcontroller communicates information to and from the front panel
and sends the EPLD the information it needs to decide whether or not to allow the
system to turn on. The front panel viewable LEDs DS3 for Operate/Standby and DS4 for
Status indicate the current operating condition of the system are mounted on and
controlled by this board. The U9 microcontroller can also communicate, using the
Optional Ethernet Kit, with a daughter card that allows the user to view remote control
parameters via a web Ethernet interface.
The ±12 VDC and +5 VDC from the (A9) power supply and the +32 VDC from the (A10)
power supply are routed to the other boards in the drawer through this board. The +32
VDC power supply operates all the time, and connects the +32 VDC to the board at J19-
1, 2, & 3 with 5 common. Q13 on the control board is turned on and off to gate the +32
VDC, which connects through J19-6, 7 & 8, to the RF output stages.
The ±12 VDC and +5 VDC input voltages to this board is connected through J21 and
filtered before being connected to the rest of the board. +12 VDC connects through
J21-1, +5VDC through J21-2 & 3, and -12 VDC through J21-6. Common connections for
the input voltages are connected to J21-4 & 5. The ±12 VDC and +5 VDC are used on
this board and also routed to the other boards in the drawer through this board. The
+3.3 VDC for the microcontroller and programmable logic array, mounted on the board,
is provided by the voltage regulator IC U6 from the filtered +5 VDC input. The output of
U6 can be adjusted to +3.3 VDC using R120.
(A9 & A10) Power Supplies used in CU0TD/RD-1 thru CU0TD/RD-5 and Driver
for CU1TD/RD-1 & higher power
Table 13: Model Number with corresponding (A10) Voltages and AC Input Voltages
MODEL (A10) POWER SUPPLY VOLTAGE AC INPUT VOLTAGE
CU0TD/RD-1 +24VDC 115VAC or 230VAC
CU0TD/RD-2 +28VDC 115VAC or 230VAC
CU0TD/RD-3 +30VDC 115VAC or 230VAC
CU0TD/RD-4 +42VDC w/878A or +48VDC w/888A 230VAC
CU0TD/RD-5 +42VDC w/878A or +48VDC w/888A 230VAC
Voltages for the operation of the boards in the drawer are generated by (A9) a +5VDC
and ±12VDC power supply and (A10) a switching power supply which is a different
power supply providing a different voltage in each model. See the chart above. The
115VAC or 230VAC input to the CU0TD/RD-1 thru CU0TD/RD-3 drawer connects through
the AC power cord at J6, the power entry module located on the rear panel of the
drawer.
The CU0TD/RD-4 & CU0TD/RD-5 drawer only operates with 230VAC. An On/Off
10A/250VAC circuit breaker is part of the power entry module. With the circuit breaker
switched On, the (L) line input is wired to F1 a 10 Amp fuse for over current protection.
The AC lines are connected to terminal block TB1, which distributes the AC to (A9 and
A10) the two DC power supplies. There are two varistors, mounted on TB1, connected
from the line input to neutral and to ground for surge protection. The AC in the
CU0TD/RD-4 & CU0TD/RD-5 also connects to the (A11) fan mounted on the rear panel
of the drawer. The fan will run when AC is applied to the drawer and the circuit breaker
is switched On. The +5VDC and ±12VDC outputs of the (A9) power supply connects to
the terminal block (TB2) that distributes the DC to the boards in the drawer. Some of