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 reading not the same|  indicator|  cockpit indicator. Recheck|  |
 as reservoir|  |  indicator readings. If|  |
 indicator reading|  Faulty reservoir|  indications still differ, replace|  |
 (EIS or Analog)|  transmitter/|  reservoir transmitter/indicator.|  |
 |  indicator|  |  |
 |  |  |  |
 Cockpit indicator at|  Faulty indicator|  |  |
 zero or below with|  |  Same as above.|  |
 fluid in tank|  Faulty transmitter|  |  |
 |(EIS or Analog)  |  |  |
 |  No 28v dc power|  Check instrument circuit breaker.|  |
 |  |  Check power at indicator pin 5(+)|  |
 |  |  to ground.|  |
 |  |  |  |
 |  Faulty wiring|  Check wiring between indicator and| |
 |  |  transmitter. Check ground at|  |
 |  |  transmitter pin 4.|  |
 |  |  |  |
 Reservoir indicator|  Faulty indicator|  Replace reservoir transmitter/|  |
 at zero or below|  |  indicator.|  |
 |with fluid in tank  |  |  |
 |  |  |  |

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-33-01
 ALL  ú ú 01 Page 101 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | Trouble | Possible Fault | Corrective Action | ................................................................................
 Cockpit indicator|  Faulty connection|  Check integrity of connections at|  |
 moves erratically,|  |  indicator and transmitter/|  |
 or jumps between|  |  indicator.|  |
 readings|  Faulty transmitter|  Replace reservoir transmitter/|  |
 |  |  indicator (Ref 29-33-12).|  |
 |  Faulty indicator|  Replace indicator.|  |
 |  |  |  |
 Indicator does not|  No power|  Check for 5v ac power at pins 6|  |
 illuminate|  |  and 7 of indicator plug.|  |
 |  |  |  |
 |  Open lighting|  Check for continuity at pins 6|  |
 |  circuit in|  and 7 of indicator.|  |
 |  indicator|  |  |
 |  |  |  |

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-33-01
 ALL  ú ú 02 Page 102 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | Trouble | Possible Fault | Corrective Action | ................................................................................
 Quantity level does|  Binding in|  Verify that the reservoir|  |
 not return to the|  quantity|  transmitters gives consistent|  |
 same level after|  transmitter|  signals to the hydraulic fluid|  |
 operation of|  (hysteresis)|  quantity displays.|  Indication |
 "heavy use"|  |  hysteresis after actuation of|  |
 system|  |  devices must not be more than | 3| |
 |  |  EIS indication digits or|  |
 |  |  equivalent on analog gauges.|  |
 |  |  |  |
 |  |  Test for excessive hysteresis in|  |
 |  |  System B transmitter:|  |
 |  |  |  |
 |  |  Recording EIS or analog|  |
 |  |  indications at flaps 0 and|  |
 |  |  flaps 10, extend flaps from 0|  |
 |  |  to 10 and return three times.|  |
 |  |  Indications at either position|  |
　
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