SYSTEM
TESTER
CONNECT TO
AIRFRAME
GROUND
AIRCRAFT
J1
WIRING CONNECTOR
AND J1 HARNESS
INDICATOR PSD60-503 IFQT
DO NOT DO NOT CONNECT CONNECT
INDICATOR-TO-IFQT
Test Equipment Set-Up for Insulation Resistance Check Figure 602 (Sheet 3)
M46299
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ISOLATED FUEL QUANTITY ú 28-41-91
TRANSMITTER (IFQT) ú CONFIG 2 ú 01 Page 609 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(5) S 766-023-002Set the FUNCTION SEL switch to MEG (not SELF TEST MEG) (PSD40-1) or set the FUNCT switch to MEASURE EXT (PSD60-1).
(6) S 766-024-002Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to LoZ - HiZ.
(7) S 766-025-002Read the total resistance for the tank units. (a) Make sure that the measured resistance is more than 250 megohms.
(8) S 766-026-002Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to COMP-HIZ.
(9) S 766-027-002Read the total resistance for the compensator. (a) Make sure that the measured resistance is more than 250 megohms.
S 766-028-002
(10) Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to each of the SHLD or GND positions shown in the table below.
(a) Make sure that the measured resistance is more than the minium resistance specified:
~............................................................ | |MINIMUM RESISTANCE| | SYSTEM TEST SET SWITCH POSITION | (Megohms) | .............................................................. |HIZ - GND (HiZ to Airframe ground) | 10 | .............................................................. |LOZ - GND (LoZ to Airframe ground) | 10 | .............................................................. |COMP - GND (Comp LoZ to Airframe ground) | 10 | .............................................................. |LOZ - SHLD (UT LoZ to Airframe ground) | 1 | .............................................................. |COMP - SHLD (Comp LoZ to Coax Shld) | 1 | .............................................................. |HIZ - SHLD (HiZ to Coax Shld) | 1 | .............................................................. |SHLD - GND (Coax Shld to Airframe ground)| 10 | 2.........................................…..................1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ISOLATED FUEL QUANTITY ú 28-41-91
TRANSMITTER (IFQT) ú CONFIG 2 ú 01 Page 610 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 766-029-002
(11) If a measured resistance value is less that the minimum value, do a check for:
(a)
A short circuit at the J2 connector (at the IFQT-end of the harness).
(b)
A short circuit at the 3-pin connector (at the tank connector-end of the harness).
G. Resistance Check of the IFQT-to-Indicator Harness
S 036-030-002
(1)
Remove the plug on the flight deck and refuel panel indicators (for the channel to be checked).
S 496-031-002
(2)
Connect the test cable (PN PSD60-503) between the test set and the applicable IFQT wire harness, but do not connect to the indicator (Fig. 602).
S 036-032-002
(3)
Disconnect the IFQT wire harness from the applicable IFQT-J1 connector.
S 766-033-002
(4)
Set the power switch on the test unit to ON.
S 766-034-002
(5)
Set the FUNCTION SEL switch to MEG (not SELF TEST MEG) (PSD40-1) or set the FUNCT switch to MEASURE EXT (PSD60-1).
S 766-035-002
(6)
Set the FUNCTION MEASURE switch (PSD40-1) or set the SELECT switch (PSD60-1) to LoZ - HiZ.
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