1-23. DAYSIDE TEST BENCH 2A1 (cont)
d, INDIRECT VIEW DISPLAY 2A1A3
(1) The indirect view display 2A1A3 is an electronic assembly located in the rear
of the dayside test bench.
It is used to test the airborne IVD and the HOD UUTS. The
dayside test bench IVD is identical to its airborne counterpart, except it does not
contain five circuit card assemblies installed in the airborne IVD.
(2) Five connectors on the IVD supply the following signals and voltages:
Connector J1 - control and status signals
Connector J2 - 115 vat, 400 Hz, 3-phase and +28 vdc
Connector J3 - video No. 1 input and video drive (HOD) output
Connector J4 - video signals and voltages
Connector J5 - coaxial cable to HOD (UUT)
e. LASER POWER SUPPLY ASSEMBLY 2A1A6
The laser power supply assembly 2A1A6 (FO-18) is located in the
rear of the dayside test bench.
It consists of a high-voltage power supply and an
electronic box assembly.
Input and output connections are made through connector
2A1W45-J1, located on the front of the dayside test bench.
(2) Electronic Box Assembly.
External power of 115 vat, 400 Hz, 3-phase is
applied to contacts of relay K1.
When all interlock switches are closed (laser safe),
HV INTERLOCK signal enables relay K1, which applies the 3-phase voltage to the high-
voltage power supply.
At the same time, relay K2 is enabled by the HV INTERLOCK sig-
nal and applies +28 vdc and -15 vdc to the laser transceiver unit UUT. Then, +28 vdc
is applied to power supply A2 in the high-voltage power supply. Terminal board assem-
bly Al is supplied 1000 vdc and 600 vdc from the high voltage power supply and trans-
mits those voltages to the major test adapter.
(3) HV Power Supply.
The electronic box assembly supplies 115 vat, 400 Hz,
3-phase to the contacts of solid-state relay CR2.
When the OPERATE SIGNAL line is
enabled, the 3-phase voltage is applied to the transformer and rectifier circuitry
which transmits 1000 vdc to the electronic box assembly. Power supply A2 changes
+28 vdc to 600 vdc and transmits this voltage to the electronic box assembly.