Keyboard STIF/PSE Loop Test

1 Diagnostic Link

Diagnostics >> System Function>> Global Operator Console>>Keyboard Datapaths

Diagnostics >> Hardware Locations>> Global Operator Console>>Keyboard Datapaths

Figure 1. Keyboard Datapaths

2 Purpose

This diagnostic verifies that the SCIM (Keyboard Processor) serial communication path is working with a loopback connector external to the PSE board.

note:

Click Calculate Time to get an estimate of the time it takes to run the selected diagnostics.

3 Components Tested

The SCIM serial communication path is tested from the SCP across the CAM Backplane to the PSE, and from the PSE across any cables between the PSE and the loopback connector. The SCIM is not tested.

4 Requirements

Before running the test, you must press the Emergency Stop button on the SCIM, then install a loopback connector external to the PSE board on the SCP to SCIM communication path. There are two possible configurations for the loopback connector:

  • Place the loopback connector directly on the PSE.

  • Place the loopback connector on the outside of the System Cabinet Interface.

To make the loopback connector, get a DB9 connector and wire pins 1 and 2 together and pins 6 and 7 together (see Figure 2). To get DB25 connector and wire pins 8 & 9 together and pins 20 & 21 together, use a male connector.. To connect to the PSE board, use a male connector.

Figure 2. SCIM to SCP Block Diagram

Figure 3. J26 Location on Cabinet Top

5 Block Diagram

Figure 4. SCIM External Loopback Block Diagram

6 Test Sequence

  1. The SCP transmits a data packet through the SCIM serial port on the SCP board.

  2. The serial data is looped back externally to the PSE board.

  3. The SCP verifies that it received the same data that was sent.

note:

Do not change the Test Options settings from the default settings unless instructed to do so by a GE Healthcare engineer. There are very few circumstances when these settings need to be changed.

7 Expected Results

After the SCIM communication path is broken to install the loopback connector, the emergency stop is triggered. Press the EMO Reset on the PDU to recover after the SCIM communication path is restored.

Output values pass or fail. In the event of failure, the details of the failure can be found in the GE System Log.

In the case of errors, click the 1st Error number to see the nature of the error. It is recommended that you view the GE System Log to view all the errors that were recorded.

If this test fails, the possible reasons are:

  • Loopback connector is defective or not installed.

  • Any cable between the loopback connector and the PSE board.

  • CAM Backplane is defective.

  • PSE board is defective.

  • SCP board is defective.

If the test passes with the loopback connector directly on the PSE, but fails with the loopback connector on the outside of the System Cabinet, then the cable from the PSE to the System Cabinet Interface or the System Cabinet Interface connector is defective.

If the test fails with the loopback connector directly on the PSE, then the problem is either the PSE board, CAM Backplane, or the SCP. Run the SCP loopback test to determine if the SCP is defective. If the SCP loopback test succeeds, check for bent or missing pins where the PSE board and SCP board connect.