(b)
Set the DISPLAY SELECT switch to RES.
(c)
Set the RESISTANCE FUNCTION switch to EXT RES.
(d)
Set the power switch to ON.
(e)
Touch the probes to each of these locations and make sure the resistance is more than the applicable minimum value:
NOTE: Change the position of the probes if the resistance
____ value is less than the minimum value. If you cannot get a resistance that is more than the minimum value, the circuit is bad.
~............................................................ | LEAD 1 | LEAD 2 | MINIMUM RESISTANCE | .............................................................. | Pin 1 of receptacle | Shield of pin 1 | 1 megohm | .............................................................. | Pin 2 of receptacle | Shield of pin 1 | 1 megohm | .............................................................. | Pin 3 of receptacle | Shield of pin 1 | 1 megohm | .............................................................. | Shield of pin 1 | Airplane ground | 10 megohms | 2.....................….................…....................1
(f)
Set the power switch to OFF.
(g)
Disconnect the leads from the system test unit.
S 485-038-001
(2) Connect the test equipment (Fig. 504).
(a)
Connect the test harness to the airplane wire bundle.
(b)
Connect the test harness to the system test unit.
S 975-039-001
(3) Measure the empty tank resistances.
(a) Set the power switch on the system test unit to ON.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 1
ú 01 Page 514 (GULL SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
HIGH
ADJ
DISPLAY
TEST LEADS
SYSTEM TESTER
GROUNDED TO AIRPLANE STRUCTURE
CONNECTED TO 115 VOLTS
DO NOT CONNECT
GULL SYSTEM TESTER
FOR CONNECTOR PIN RESISTANCE MEASUREMENTS
ALL EXCEPT
Test Equipment Set-Up for Resistance Measurement Figure 504
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 1
ú 01 Page 515 (GULL SYSTEM TESTER) ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(b)
Set the RESISTANCE FUNCTION switch to each of these positions:
1) Make sure that each resistance shown on the system test unit is more than the applicable resistance: ~........................................... | SWITCH SETTING | MINIMUM RESISTANCE | ............................................. | C-GND | 10 Megohms | ............................................. | B-GND | 10 Megohms | ............................................. | A-GND | 10 Megohms | ............................................. | A-C | 250 Megohms | ............................................. | A-B | 250 Megohms | 2..................…........................1
(c)
Set the DISPLAY SELECT switch to CAP.
(d)
Set the CAPACITANCE FUNCTION switch to A/C TEST - UNSH.
S 415-054-001
(4)
Do this task: Fuel Summation Unit Installation (AMM 28-41-81/401).
S 825-055-001
(5)
Set the capacitance trimmer.
NOTE: This step sets the airplane wiring to a standard
____ capacitance value of 16 pf. This will make it easier to find problems with the capacitances of the equipment in the fuel tank.
(a)
Get access to the bussing plug installed on the spar for the applicable tank (Fig. 501).
(b)
Disconnect the electrical connector from the bussing plug.
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