S 766-025-001

 (2)  
Set the battery switch to ON.

 S 766-026-001

 (3)  
Turn the METER ADJUST knob until the meter is at its maximum value.

 S 766-027-001

 (4)  
Set the INS TEST POINTS switch to LO-Z/HI-Z.

 S 766-028-001

 (5)  
Read the total resistance for the tank units.

 (a)  Make sure the resistance shown on the test unit is more than 250 megohms.
 S 766-029-001
 (6)  Set the INS TEST POINTS switch to each of the SHLD or GND positions shown below.
 (a)  Make sure that each resistance shown on the test unit is more than the applicable minimum resistance:
 ~.............................................................. | SYSTEM TESTER SWITCH POSITION | MINIMUM RESISTANCE | | | Megohms | ................................................................ | GND/HIZ (Airplane Ground to Hi-Z) | 10 | | GND/LOZ (Airplane Ground to Tank | 10 | | Unit Lo-Z) | | | SH/LOZ (Coax Shield to Tank Unit | 1 | | Lo-Z) | | | SH/HIZ (Coax Shield to Hi-Z) | 1 | | GND/SH (Airplane Ground to Coax | 10 | | Shield) | | 2.......................................…......................1
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITHOUT ISOLATED FUEL QUANTITY ú  28-41-91
 TRANSMITTER (IFQT)  ú  CONFIG  1
 ú  01  Page 607
 ú  Mar 12/02 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 016-030-001
 (7)  
Disconnect the UNSHIELDED wire bundle of the test harness from the INSULATION LO-Z receptacle on the test unit.

 S 486-031-001

 (8)  
Connect the COMP wire bundle to the INSULATION LO-Z receptacle.

 S 766-032-001

 (9)  
Set the INS TEST POINTS switch to LO-Z/HI-Z.

 S 766-033-001

 (10)
 Read the resistance of the compensator.

 (a)  Make sure the resistance on the system tester is more than 250 megohms.
 S 766-034-001
 (11) Set the INS TEST POINTS switch to each of the SHLD or GND positions shown below.
 (a)  Make sure that each resistance shown on the test unit is more than the applicable minimum resistance:
 ~.............................................................. | SYSTEM TESTER SWITCH POSITION | MINIMUM RESISTANCE | | | Megohms | ................................................................
 |  GND/LOZ  (Airplane Ground to  |  10  |
 |  Compensator Lo-Z)  |  |
 |  SH/LOZ (Coax Shield to Compensator  |  10  |
 |  Lo-Z)  |  |

 2.......................................…......................1
 S 766-035-001
 (12) If a resistance value is less than the minimum value, do a check for a short circuit in one of these areas (AMM 28-41-21/501 or AMM 28-41-03/501):
 (a)  
The tank unit 1) The wires that connect the tank unit to the FQIS 2) The plug that connects the tank unit to the wire bundle 3) The receptacle that connects the tank unit to the wire

 bundle.

 (b)  
The compensator unit 1) The wires that connect the compensator unit to the FQIS 2) The plug that connects the compensator unit to the wire

 bundle
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITHOUT ISOLATED FUEL QUANTITY ú  28-41-91
 TRANSMITTER (IFQT)  ú  CONFIG  1
 ú  01  Page 608
 ú  Mar 12/02 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 3)  The receptacle that connects the compensator unit to the wire bundle.
 H.  Put the Airplane Back to Its Usual Condition
 S 036-036-001
 (1)  
Disconnect the test harness from the bussing plug.

 S 086-037-001

 (2)  
Remove the test harness and the system tester.
　
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