• SIGNA MR355 / SIGNA MR360
  • Service Manual
  • 5856356-3EN Revision 5.0
  • Basic Service Documentation. Copyright General Electric Company.
  • Object ID: 00000018WIA304C0030GYZ
  • Topic ID: id_13106239 Version: 1.2
  • Date: Jul 5, 2019 10:46:04 PM

ICE SRI PAC Fiber Optic Checks

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1 - - -
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Fiber Optic Light Meter Kit1-

46-317830G1

-
Table 3. Safety
Table 4. Required conditions
ConditionReferenceEffectivity

Fiber Optic Light Meter Kit Parts Break Down.

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About this task

This procedure describes how to turn on the fiber optic drivers in a Signa system. Software output control is provided for the HFBR-1522/HFBR–1528 drivers (plastic cable) on the ICE, the HFBR-1522s (plastic cable) on the PAC and the SRI.

ICE, SRI, PAC FIBER OPTIC CHECKS

Procedure

  1. Access to the ICE and disconnect the 5 fiber optic cables from J38, J39, J40, J41, J42 of ICE according to the Figure 1.
  2. The Fiber Optic Test can be selected from the Diagnostics menu. The drivers on the ICE (See Figure 1) remain on until the Fiber Optic Test is canceled. The drivers on the link remain on until the test is canceled, or a break occurs in the link upstream from the device being tested.
    Figure 1. ICE LOCATION

Fiber Optic Power Level Measurement

Procedure

  1. To turn on the HFBR-1522/HFBR–1528 drivers on ICE and the HFBR-1522 drivers on the SRI fiber optics and ICE - SRI fiber optics, go to the Service Desktop on the host computer and start the Service Browser by clicking the Service Browser button on the diagnostics menu on the left side of the screen.
  2. This test illuminates the fiber optic transmitters on the ICE to allow testing their intensity. The LEDs illuminated are SRI Reset, SRI Tx, and PAC Tx. They will continue to be illuminated until the Stop button is pressed.
  3. Remove protective cover and install the appropriate adapter (46-320033G1 for plastic cables; FOA-32 for glass cables) onto the fiber optic meter. Plug test cable (1/2 m for plastic (46-307564P4), 1 m for glass (46-307584P3)) onto the adapter. See Figure 2.
    Figure 2. FIBER OPTIC MEASUREMENT CONFIGURATION
  4. Use the on/off button to turn on the EXFO fiber optic meter. Make sure the meter is on 660 calibration for plastic links. Use the λ Select button to alternate between wavelength values displayed on the meter LCD display. Use the dBm/W button to select dBm unit scale on the meter LCD display.
  5. Disconnect system cable from transmitter (gray fiber optic connector) under test. Connect the test cable into the transmitter under test.
    Note:

    Cable damage possibility. Disconnecting the fiber optic cables by pulling on the cable can damage the cable/connector. Use the connector to disconnect cables.

    Note:

    The fiber optic connectors are a latching type connector. For the plastic cable connectors, press on the latch to release. For the glass cable connectors, press in on outer connector shell and rotate a quarter turn.

  6. Measure transmitter output through test cable with EXFO fiber optic meter. Compare this value with specification. See Figure 3. If value is out of spec, there is a problem. It could be a power supply problem, transmitter problem, or functional problem with board. Do not proceed until this value is within spec.
    Figure 3. 1.5T FIBER OPTIC POWER LEVELS
    Note:

    The fiber optic connectors are a latching type connector. For the plastic cable connectors, press on the latch to release. For the glass cable connectors, press on the outer connector shell and rotate a quarter turn.

  7. Disconnect test cable from the transmitter under test and reconnect system cable to transmitter.
  8. Disconnect test cable from EXFO fiber optic meter.
  9. Disconnect far end of system cable from receiver (blue fiber optic connector; gray for some) and connect system cable to meter adapter.
  10. Note:

    For the optical cable form PAC (the cable connected to J38/J39 at ICE), just inspect that the signal light can be seen from the cable end.

    Measure optical output from system cable. Compare this value with specification. If this value is out of spec and the transmitter output was within spec, there is a cable routing issue or a damaged cable. Check cable for kinks, tight radius bends, damaged or poorly polished connectors, etc.
  11. Repeat this procedure for each link that requires testing.

TEST SPECIFICATIONS

About this task

The following data characterize fiber optic power levels in a Signa system. Typical data were obtained from a limited sample of systems. Typical values may cover a wide range due to the effects of cable routing, connecting, and cable length which may vary from system to system. Minimum values, however, are absolute, and will be the same for fixed sites, mobiles, and T/R(s).

Procedure

Plastic Data Links (AMP fiber 501232-5 or 501336-1 with HP versatile link connectors and 660 nm HFBR-1522/ HFBR-2522 transmitter/receiver pair):

ICE J41 to SRI J11; ICE J42 to SRI J13; SRI J12 to ICE J40; ICE J39 to PAC J9; PAC J10 to ICE J38;

  • Nonmodulated HFBR-1522/HFBR-1528 transmitter output through 1/2 m test cable:

    Typical: -8.5 dBm

    Minimum: -11.2 dBm

  • Nonmodulated HFBR-1522/HFBR-1528 transmitter output through 147 ft cable:

    Typical: -21.5 dBm

    Minimum: -23.0 dBm

Note:

Do not observe the light directory. Use white paper and reflect the beam to observe.

Finalization

Procedure

  1. Turn off the fiber optic meter. Disconnect all kit components used in measurement scheme and return to kit.
    Figure 4. Fiber Optic Light Meter Kit
  2. Restore all system fiber optic cables and components to original configuration.