2025177-028 Main Power Supply - GE Corometrics 250cx Series Service Manual

2025177-028 Main Power Supply

Revision C
Parts List, Drawings, and Replacement: Assembly/Disassembly of FRUs
1. Remove top cover. Keep screws aside.
2. Remove two screws fastening DSP board to chassis.
3. Remove DSP board from Main board.
4. Disconnect 8-conductor Inverter cable from DSP board connector J1.
5. Disconnect 20-conductor DSP-to-LCD Decoder ribbon cable from DSP board
connector J2.
6. Disconnect 10-conductor DSP-to-Keypad ribbon cable from DSP board
connector J5.
7. Disconnect external display cable from J9 on DSP/Display PWA.
8. Remove clear section of tubing from E1 to PT1 on Main board.
9. Remove clear section of tubing from E2 to PT2 on Main board.
10. Remove Pneumatics assembly. Leave tubing connected to Front Bezel. The
tubing length should be sufficient.
11. Cut tie-wrap holding power-switch cable to cable-tie mount on chassis.
12. Disconnect power-switch cable from power supply bulkhead-mounted
connector.
13. Remove power supply bulkhead-mounted connector from chassis with needle-
nose pliers.
14. Disconnect Power Supply cable from J1 connector on Recorder board. Slide
grommet out of bulkhead.
15. Disconnect Power Supply cable from J8 connector on Main board. Slide
grommet out of bulkhead.
16. Remove three flat-head screws from side of Power Supply. (See photograph
below.)
17. Remove four pan-head screws from back of Power Supply.
18. Remove one pan-head screw from inside bottom of Power Supply. (See
photograph below.)
19. Unplug Fan from Power Supply.
20. Remove Power Supply from chassis.
21. Replace with new Power Supply.
22. Fasten three flat-head screws into side of Power Supply.
23. Fasten four pan-head screws into back of Power Supply.
24. Fasten one pan-head screw into inside bottom of Power Supply.
25. Connect Power Supply cable to J1 connector on Recorder board.
26. Connect Power Supply cable to J8 connector on Main board.
27. Insert power supply power-switch connector into chassis.
28. Connect front-bezel power-switch cable to chassis-mounted connector.
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