• Topic ID: id_16158060
  • Version: 1.0
  • Date: Jul 7, 2018 4:30:29 PM

JEDI - Switches, TPs, Fuses, LEDs

1 Introduction

This section provides LED, switch, connector, and fuse information for the X-Ray Generation Subsystem.

All Test Points and LEDs are easily accessible and clearly labeled. Standard color coding of LEDs shall be used:

  • RED for hazard / fault conditions

  • GREEN for OK status conditions

  • YELLOW for other conditions

2 Power On Self Tests

note:

Related Topic: Power-On Sequence Theory.

The LED display status offers useful visual feedback which can help to enable error-code based troubleshooting. Whenever in doubt, a useful first step is to look at the LED status display on the PPC kV control board, then check the LEDs on the LVPS400, Rotation, and Heater boards.

2.1 PPC kV Control Board Indicators

The LEDs indicating the status are the yellow LEDs, DS17 to DS24 on PPC kV control board. For the location of these LEDs, see the PPC kV Control Board block diagram in Figure 7.

2.2 LED Status

2.2.1 Power-On Diagnostics (on PPC kV Control Board)

In the figures below, means LED ON and, means LED OFF.

Figure 1. DS17 through DS24

  • Power On self tests: LEDs DS17 to DS24 are lit successively several times very fast.

  • Application mode: LEDs DS17 to DS24 are lit successively more slowly. The power up self tests are completed, PPC kV control board is up and running.

Figure 2. DS17 through DS24

Half of the 8 LED are lit: After the download of the boot this indicates that the PPC kV control board is erasing the flash memory and preparing for the download of the application. When these tasks are done, the four LEDs on the right will be lit as shown in the following figure.

Figure 3. DS17 through DS24

Half of the 8 LED are lit: Normal after the download of the boot. This can also indicate a corrupt software problem or database checksum problem. In case of software problem communication with the generator will not be possible. Try to download again the software or replace PPC kV CTRL board. In case of database problem, an error code is logged and communication with the generator is possible. Refer to error code description.

Figure 4. DS17 through DS24

When an application error occurs, LEDs blink indicating the simplified error code in binary code. When the error is cleared, the 8 LEDs are lit successively.

2.2.2 Heater Board

After the power on diagnostics, heater board LEDs DS1 and DS2 are lit successively. Refer to block diagrams for complete explanation of LED indication on this board. Any different status corresponds to an abnormal situation. An error code is logged. Refer to error code description.

2.2.3 Rotation Board

note:

See block diagrams.

After the power on diagnostics, rotation board LED DS5 is blinking. Refer to block diagrams for complete explanation of LED indication on this board. Any different status corresponds to an abnormal situation. An error code is logged. Refer to error code description.

2.2.4 LVPS400 Board

note:

See block diagrams

After the power on diagnostics, LVPS400 board LEDs DS3 and DS4 are lit successively. Any different status corresponds to an abnormal situation. An error code is logged. Refer to error code description.

3 CT-IF-V4 Board

3.1 Board Location

Figure 5. CT-IF-V4 Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 6. CT-IF-V4 Board

290863.pdf

3.2 Board Connections

4 PPC KV Control V2 Board

4.1 Board Location

Figure 7. PPC KV Control V2 Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 8. PPC KV Control V2 Board

252335.pdf

4.2 Board Connections

4.3 Board Switches and Jumpers

No switches and jumpers are installed on this board.

4.4 Board Indicators

5 GATE CMD Board

5.1 Board Location

  • warning
  • Electrocution hazard.
  • High Voltage present.
  • Do not touch the board UNTIL DS300 on this board and DS1 on the Dual Snub board go out.
  • warning
  • Burn Hazard.
  • The surface on transformer T300 and heat sink can become very hot.
  • Do not touch the transformer or heat sink.

Figure 9. GATE CMD Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 10. GATE CMD Board

252343.pdf

5.2 (Other possible GATE CMD board implementation)

Figure 11. (Other possible GATE CMD board)

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 12. (Other possible GATE CMD board)

252351.pdf

6 KV MEASURE (standard) Board

6.1 Board Location

Notice Image
  • notice
  • This board forms part of the oil seal of the High Voltage Tank. It can only be removed at the factory. The Field Replaceable Unit (FRU) is the complete HV Tank.

Figure 13. KV_MEASURE Two Tubes Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 14. KV_MEASURE Two Tubes Board

252356.pdf

6.2 Board Connections

7 HEATER V6 Board

7.1 Board Location

  • warning
  • Electrocution hazard.
  • High Voltage present.
  • Do not go into generator until indicator DS1 and DS3 go out.

Figure 15. HEATER V6B Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 16. HEATER V6B Board

290866.pdf

7.2 Board Connections

8 ROTATION Board

8.1 Board Location

  • warning
  • Electrocution hazard.
  • High Voltage present.
  • Do not go into generator until indicator DS6 and DS7 (neon-orange) go out.

Figure 17. Rotation Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 18. Rotation Board

252359.pdf

8.2 Board Connections

8.3 J2 Wiring

Figure 19. J2 Wiring

8.4 Board Indicators

I

9 PI Filter Board

9.1 Board Location

  • warning
  • Electrocution hazard.
  • High Voltage present.
  • Do not go into generator until complete shut down of NGPDU.

Figure 20. PI Filter Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 21. PI Filter Board

290869.pdf

9.2 Board Connections

9.3 Board Indicators

There are no LEDs on this board.

10 LVPS400 Board

  • warning
  • Electrocution hazard.
  • High Voltage present.
  • Do not go into generator until DS8 (neon-orange) goes out.
  • warning
  • Burn Hazard.
  • THE RECTIFIER BRIDGE ON THIS BOARD CAN BECOME VERY HOT.
  • Do not touch the rectifier bridge.

Figure 22. LVPS400 Board

note:

For a larger version of the above illustration, click on the pdf icon below:

Figure 23. LVPS400 Board

252394.pdf

Board Connections: