7-28. OPTICAL SIGNAL GENERATOR (OSG) 2A2A3
INPUT CODE: OSGST
This module tests the ability of the optical signal generator (OSG) assembly
2A2A3 lamps to respond to on and off commands.
Lamp detector A2 is checked through the A/D converter lamp detector channel.
Voltage is applied and output compared to an upper limit of 0.50 vdc and a lower
limit of -1.00 vdc.
The CTF lamp is then checked with an application of 10.2 vdc. After a 2 second
delay output is compared to an upper limit of 4.00 vdc and lower limit of 0.80 vdc.
The sphere lamp is then checked with an application of 25.4 vdc. After a 2
second delay output is compared to an upper limit of 4.00 vdc and lower limit of
Lamp detector A3 is checked for same parameters as detector A2.
The CTF lamp is then checked with an application of 23 vdc. After a 2 second
delay output is compared to an upper limit of 8.00 vdc and lower limit of 2.00 vdc.
If an error is detected a prompt is displayed at the completion of each test.
REPLACEMENT PROCEDURE REFERENCE
The following list provides a cross reference of replacement items to
The item column identifies the item to be replaced by
reference designation and part number.
The reference column identifies the
procedural paragraph used to perform the replacement action. The VDT screen will
display the proper sequence of repair/replace actions.
(Ref Des/Part No.)
2A2A6XX (SLOT 408)/69331B
2A2A13XX (SLOT J7)/AC4720