FUNCTION
CAPACITOR

TANK  ADAPTER CABLE 
WING  PSD40-502-3 
CENTER  PSD40-502 

TO UNITS
T-CABLE
WIRING
SIMMONDS PSD40-1 SYSTEM TESTER
Test Equipment Set-Up for Capacitance Simulation
Figure 503 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS  ú  CONFIG  2
 ú  01A  Page 512
 (SIMMONDS SYSTEM TESTER)  ú  Jul 15/93 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SYSTEM TESTER POWER SWITCH
SIMMONDS 
PRECISION 
CHASSIS  ON OFF  000.0  M PF  MEG READINGS TWO TERM. PRESS FOR 
PSD60-1 
AIRCRAFT ONLY 
C M O P T U  C H T LOZ HIZ SHLD COMP INDICATOR  UNITS TANK  TU COMP HIZ-GND COMP-GND LOZ-GND SHLD-GND HIZ-SHLD LOZ-HIZ LOZ-SHLD LOZ-COMP COMP-HIZ COMP-SHLD MEASURE INT SIM TU ONLY MEASURE EXT PF M SIM TU & COMP  T C E L E T F U N C S  COMP 0 3 10-200 PF  SIMULATOR  TU 0 5 4 10-2000 PF 

CONNECT TO AIRFRAME GROUND  WING CENTER TANK  PSD40-502 PSD40-502-3 ADAPTER CABLE 
FUEL QUANTITY INDICATOR  CABLE ADAPTER T-CABLE SIMMONDS PSD60-1 SYSTEM TESTER PSD40-503  WIRING AIRCRAFT  TO AND TANK COMPENSATOR UNITS 
Test Equipment Set-Up for Capacitance Simulation Figure 503 (Sheet 2) 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS  ú  CONFIG  2
 ú  01A  Page 513
 (SIMMONDS SYSTEM TESTER)  ú  Jul 15/93 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

FUNCTION DECADE MEASURE CAPACITOR SWITCH
FUNCTION
SIMMONDS  COMP-SHLD HIZ-SHLD  LOZ-GND SHLD-GND  SIMULATOR 
PRECISION  LOZ-SHLD COMP 2  COMP-GND 
FUNCTION  D4  M^ PF  TU COMP-HIZ COMP LOZ-COMP  LOW HIGH HIZ-GND  D1  X100 PF  V1 
SELECT  LOZ-HIZ MEASURE  S3  0-200 PF 
SWITCH  INT CAP  SIM  TU  VERNIER 
EXT CAP  SELFCAP  KNOBS 
TEST 
MEG  MEG 
D2  X10 PF  V2 
FUNCTION SEL S2  0-25 PF 
J1  LOZ  J4 
PSD40-1  COMP 
TESTER  HIZ 
POWER 
SWITCH  COMP  3  X10 PF  V3 
TOR  TAN  0-25 PF 
S1  ON  J9  COMP 
O F  CHA  SIS  LOZ  2  COMP 2 

UNSHIELDEDGROUNDED TO
ADAPTER CABLES AIRPLANE (MADE LOCALLY) STRUCTURE
F72731
FUEL QUANTITY INDICATOR
COMP COAXIAL
TO COMPENSATOR AND TANK UNITS
SIMMONDS PSD40-1 SYSTEM TESTER WITH THE F72731 CABLE
Test Equipment Set-Up for Capacitance Simulation Figure 503 (Sheet 3)
C40115
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS  ú  CONFIG  2
 ú  01A  Page 514
 (SIMMONDS SYSTEM TESTER)  ú  Jul 15/93 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 975-025-002
 (4)  Do a check of the values on the fuel quantity indicator with a full tank.
 (a)  Connect the test harness to the rear of the fuel quantity indicator.
 (b) (c)  Close the QTY and EP GND FUELING circuit breakers, and let the system become warm for five minutes.Make sure the fuel quantity indicator shows the applicable full value with the applicable tolerance: TANK FULL VALUE
　
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