• SIGNA MR355 / SIGNA MR360
  • Service Manual
  • 5856356-3EN Revision 5.0
  • Basic Service Documentation. Copyright General Electric Company.
  • Object ID: 00000018WIA303D1F20GYZ
  • Topic ID: id_13107590 Version: 1.1
  • Date: Jul 5, 2019 10:46:05 PM

1.5TGP Flex Coil Troubleshooting Tips

Overview

The following tips can be used to troubleshoot common problems with the Signa Horizon 1.5T /Signa Horizon LX 1.5T /Signa Twin Speed 1.5T/Signa Infinity 1.5T Signa Infinity Twin Speed 1.5T/Signa CV/i 1.5T/Signa MR/i 1.5T /Signa HDe 1.5T GP Flex coil.

Coil fault Troubleshooting

The system reports a coil fault during prescan or does not recognize the coil connection to the system when selected in the software

Table 1.
Probable Cause Suggested Actions Resolution
The coil connector has become disconnected from the system interface.Check to make sure the coil connector is fully engaged.Engage connector and try the scan again.
Coil ID issues.From CSD, select Diagnostics, Manual Tests, SRI Functional Checks, and run the SRI Coil ID test. Compare the coil ID value found to that listed in the coil configuration.If the value does not match, or no coil ID is found, perform Cable Replacement.

External Cable Check

  1. Select the DIODE TEST function on the DMM.

  2. Connect the POSITIVE lead of the DMM to the center pin of the BNC on the external cable. Connect the NEGATIVE lead to the main housing/ground of the BNC.

  3. Flex the external cable, especially near the connectors and the strain relief, and observe that a reading of 0.400 to 0.600 should remain on the DMM, with no instability or fluctuations.

  4. Connect the POSITIVE lead of the DMM to the main housing/ground of the BNC on the external cable. Connect the NEGATIVE lead to the center pin of the BNC.

  5. Flex the external cable, especially near the connectors and the strain relief, and observe that a reading of INFINITY should remain on the DMM, with no instability or fluctuations.

  6. If the cable fails any of the above tests, replace it. Refer to Section 5-2 External Cable Replacement.

Figure 1.

PIN Diodes Check

Note:

There is only one PIN diode in this antenna. This procedure will indicate if the PIN diode is defective.

  1. Select the DIODE TEST function on the Digital Multimeter (DMM).

  2. Connect the POSITIVE lead of the DMM to the center pin of the BNC on the external cable. Connect the NEGATIVE lead to the main housing/ground of the BNC.

  3. A reading of 0.400 to 0.600 should be observed on the DMM.

  4. If a reading below 0.400 is observed in either direction, either the output cable is shorted or the PIN diode is bad.

  5. If a reading above 0.600 is observed in step 3, the PIN diode is defective.

  6. Connect the POSITIVE lead of the DMM to the main housing/ground of the BNC on the external cable. Connect the NEGATIVE lead to the center pin of the BNC.

  7. A reading of INFINITY should be observed on the DMM.

  8. If a reading of INFINITY is observed in both directions, either the output cable is open or the PIN diode is open.

  9. If any of the above conditions fails, replace the PIN diode. Refer to Section 5-4 Replacing the PIN Diode.