S 766-015-001
 (9)  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 3) The receptacle that connects the compensator unit to the wire bundle.
 F.  SIMMONDS (JCAIR) PSD40 OR PSD60 SYSTEM TESTER; Do the Resistance Check
 S 736-016-001
 (1)  
Set the power switch on the test unit to ON.

 S 736-017-001

 (2)  
Set the FUNCTION SEL switch to MEG (not SELF TEST MEG) (PSD40-1) or set the FUNCT switch to MEASURE EXT (PSD60-1).

 S 736-018-001

 (3)  
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to LOZ-HIZ.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITHOUT ISOLATED FUEL QUANTITY ú  28-41-91
 TRANSMITTER (IFQT)  ú  CONFIG  1
 ú  01  Page 605
 ú  Mar 12/02 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 736-019-001
 (4)  Read the total resistance for the tank units.
 (a)  Make sure the resistance shown on the test unit is more than 250 megohms.
 S 736-020-001
 (5)  
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to COMP-HIZ.

 S 736-021-001

 (6)  
Read the total resistance for the compensator.

 (a)  Make sure the resistance shown on the system tester is more than 250 megohms.
 S 736-022-001
 (7)  Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to each of the SHLD or GND positions.
 (a)  Make sure the minimum resistance agrees with the values shown in this table:
 ~.............................................................. | SYSTEM TESTER SWITCH POSITION | MINIMUM RESISTANCE | | | Megohms | ................................................................
 |  HIZ-GND  (Hi Z to Airplane Ground)  |  10  |
 |  LOZ-GND  (Tank Unit Lo Z to Airplane |  10  |
 |  Ground)  |  |
 |  COMP-GND (Compensator Lo Z to  |  10  |
 |  Airplane Ground)  |  |
 |  LOZ-SHLD (Tank Unit Lo Z to Shield)  |  1  |
 |  COMP-SHLD (Compensator Lo Z to  |  1  |
 |  Coax Shield)  |  |
 |  HIZ-SHLD (Hi Z to Coax Shield)  |  1  |
 |  SHLD-GND (Coax shield to Airplane  |  10  |
 |  Ground)  |  |

 2.......................................…......................1
 S 816-023-001
 (8)  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
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITHOUT ISOLATED FUEL QUANTITY ú  28-41-91
 TRANSMITTER (IFQT)  ú  CONFIG  1
 ú  01  Page 606
 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 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 3) The receptacle that connects the compensator unit to the wire bundle.
 G.  BARFIELD 8000 SYSTEM TESTER; Do the Resistance Check
　
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