User Manual

UHF Analog Driver/ Transm it ter Chapter 4, Circuit Descript ions
LX Series, Rev. 0 4- 17
jack J43 pin 15A, the PLL Lock Indicator
output of the board.
Volt age Requirem ents
The board is powered by ± 12 VDC that is
produced by an external power supply.
+ 12 VDC enters the board through J43
pins 18A, B & C, and is filtered and
isolated by L5, L6 and the shunt
capacitor C24. The + 12 VDC is then
applied to the rest of the board and to
J14 pin 3 for use by the UHF Generator
Board.
One connection of the + 12 VDC is to I C
U12. U12 and associated circuitry
produce a + 9 VDC that connects to J14
pin 1 for use by the UHF Generator
Board.
Another connection of the + 12 VDC is to
a + 5 VDC regulator. The + 12 VDC
connects to diodes CR6 and CR7 that
along with the pi type filter consisting of
C56, L10, C54 and C55 rem oves any
noise from the + 12 VDC before it
connects to the + 5 VDC regulator I C U8.
The output of the IC U8, + 5 VDC,
connects to the rest of the board.
The - 12 VDC enters the board through
J43 pins 19A, B & C and is filtered and
isolated by L7 and the shunt capacitor
C28. The - 12 VDC is then applied to the
rest of the board and to J14 pin 5 for use
by the UHF Generator Board.
4 .4 ( A4 ) Control M on it oring/ Pow er
Supply M odule ( 1 1 0 VAC, 1 3 0 1 9 3 6 OR
2 2 0 VAC, 1 3 0 3 2 2 9 ;Appe ndix B)
The Control Monitoring/ Power Supply
Module Assem bly contains (A1) a Power
Protection Board ( 1302837), ( A2) a 600
Watt Switching Power Supply, (A3) a
Control Board (1302021), (A4) a Switch
Board (1527- 1406) and ( A5) a LCD
Display.
AC I nput t o Pioneer Excit er/ Am plifier
Chassis Assem bly
The AC input to the Pioneer
Exciter/ Amplifier Chassis Assembly is
connected from J1, part of a fused entry
module, located on the rear of the chassis
assem bly to J50 on the Control
Monitoring/ Power Supply Module. There
are two possible m odules that can be part
of your system , 1301936 for 110 VAC or
1303229 for 220 VAC operation. J50- 10 is
line # 1 input, J50- 8 is earth ground and
J50- 9 is line # 2 input. The input AC
connects to J1 on the Power Protection
Board where it is fuse protected and
connected back to J50, at J50- 11 AC Line
# 1 and J50- 12 AC Line # 2, for distribution
to the cooling Fan.
4 .4 .1 ( A1 ) Pow er Prot e ct ion Board
( 1 3 0 2 8 3 7 ; Appe ndix B)
The input AC connects through J1 to two
10 Am p AC fuses F1 and F2. The AC line
# 1 input connects from J1- 1 to the F1
fuse. The AC line # 1 input after the F1
fuse is split with one line connected back
to Jack J1 Pin 4, which becom es the AC
Line # 1 to the Fan. The other line of the
split connects to J4. The AC line # 2 input
connects from J1- 3 to the F2 fuse. The
AC line # 2 input after the F2 fuse is split
with one line connected back to Jack J1 at
Pin 5, which becom es the AC Line # 2 to
the Fan. The other line of the split
connects to J2. J1- 2 is the earth ground
input for the AC and connects to J3.
Three 150- VAC, for 115 VAC input, or
three 275- VAC, for 230 VAC input, MOVs
are connected to the input AC for
protection. One connects from each AC
line to ground and one connects across t he
two lines. VR1 connects from J4 to J2, VR2
connects from J4 to J3 and VR3 connects
from J2 to J3.
+ 12 VDC Circuit s
+ 12 VDC from the Switching Power
Supply Assembly connects to J6 on the
board. The + 12 VDC is divided into four
separate circuits each with a 3 amp self
resetting fuse, PS3, PS4, PS5 and PS6.