S 035-034-001
(7)
Disconnect the electrical connector from the rear of the indicator.
S 015-057-001
(8)
Do this Task: Fuel Summation Unit Removal (AMM 28-41-81/401).
E. Procedure
S 975-035-001
(1) Measure the connector pin resistances.
(a)
Connect the resistance probes to the EXT RES receptacles on the system test unit.
(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. ~...................................................... | 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 1) 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.
(f)
Set the power switch to OFF.
(g)
Disconnect the probes from the system test unit.
S 485-036-001
(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 975-037-001
(3) Measure the empty tank resistances.
(a) Set the power switch on the system test unit to ON.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
INDICATORS ú CONFIG 1 ú 01A Page 513 (GULL SYSTEM TESTER) ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
HIGH
ADJ
DISPLAY
TEST LEADS
1
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 ANALOG FUEL QUANTITY ú
28-41-00 INDICATORS ú CONFIG 1
ú 01A Page 514 (GULL SYSTEM TESTER) ú Jul 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 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
(c)
Set the DISPLAY SELECT switch to CAP.
(d)
Set the CAPACITANCE FUNCTION switch to A/C TEST - UNSH.
S 415-058-001
(4)
Do this Task: Fuel Summation Unit Installation (AMM 28-41-81/401).
S 825-059-001
(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 on the spar for the applicable tank (Fig. 501).
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