DC POWER SUPPLY ASSEMBLY 1A4 7 -4 INPUT CODE: FPSST

TM 11-6625-3081-23 7-4. DC POWER SUPPLY ASSEMBLY 1A4 7 -4 INPUT CODE: FPSST a . DESCRIPTION This module tests fixed power supplies 1A4PS1, 1A4PS2, 1A4PS3, and 1A4PS4. The 1A4PS1 28 vdc output is measured by using channel 226 of A/D converter assembly 2A2A13 and scaling accordingly. A prompt is displayed if voltage is not +26.0 to +30.0 vdc. The 1A4PS2 +15 vdc output is measured using channel 227 of A/D converter assembly 2A2A13 and scaling accordingly. A prompt is displayed if voltage is not +14.0 to +16.0 vdc. The 1A4PS3 -15 vdc output is measured using channel 228 of A/D converter assembly 2A2A13 and scaling accordingly. A prompt is displayed if voltage is not -14.0 to -16.0 vdc. The 1A4PS4 +5 vdc output is measured using channel 229 of A/D converter assembly 2A2A13, and scaling accordingly. A prompt is displayed if voltage is not +4.5 to +5.5 vdc. b. REPLACEMENT PROCEDURE REFERENCE The following list provides a cross reference of replacement items to replacement procedures. 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. Item Reference (Ref Des/Part No.) (Para No.) 1A4PS1/BKF-28-4 2-33 1A4PS2/BKF-15-6 2-33 1A4PS3/BKF-15-6 2-33 1A4PS4/BKF-5-11 2-33 2A2A13XX (SLOT J8)/AC4720 2-61 2A2A7A6A4/13082738 2-51 7-22