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747-400
MAINTENANCE MANUAL
ACCESS DOOR
FUEL QUANTITY
PROCESSOR UNIT, M7860
FUEL QUANTITY
PROCESSOR UNIT,
M7860
FWD E6 RACK CIRCUIT CARD ADAPTER PSD747-21
FIELD CALIBRATION UNIT PSD60-1,-2,-2R PSD747-20 INTERCONNECT CABLE
Simmonds ON PRESS FOR TWO TERM.
Precision
MEG READINGS
CHASSIS
OFF SIGNAL
PSD746-2
VTO POT
GH
FI
E J
DK
C
L B
AIRCRAFT ONLY HI WIPER LO
M
SIM TU ONLY
F
A N
DISCRETESSIMULATOR
O
SIM TU & COMP U PROBE SELECT
TANK N
UNITS
INDICATOR COMP
TU T + -W/DMEASURE INT C
MEASURE EXT
LOZ TU LBS/KG WOW 1 WOW2 LO-Z HI-ZPF COMP
T
LOZ-HIZ
U
10-200 PF 10-2000 PFCOMP-HIZ OFF
DENSITY R1 C
S
LOZ-COMP
HIZ LOZ-SHLD E R2
L
GOODSHLD COMP-SHLD
O E R3
HIZ-SHLD
MM C
SHLD-GND
R4 COMP
P T
LOZ-GND BAT R5BADCOMP-GND R6 R7 HIZ-GND R8
OFF
INTERCONNECT TEST SET PSD747-2
PSD60
CABLES
Processor and In-Tank Component Test Set-Up (at the Processor)
Figure 505
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A
747-400
MAINTENANCE MANUAL
(5) Do this task to remove the applicable IFQC card from the card file:
ESDS Circuit Card Removal (AMM 20-41-02/201).
S 485-163
(6) Do these steps to install the PSD747-21 circuit card adapter.
(a) Install the PSD747-21 circuit card adapter into the slot of the
removed IFQC card.
(b) Make sure the PROCESSOR arrow on the circuit card adapter
points up when you install the adapter in the FQPU, M7860.
(c) Push the card extractors to engage the PSD747-21 circuit card
adapter with the mating connectors.
S 485-097
(7) Make sure the DENSITOMETER switch on the PSD747-2 test set is in the
OFF position.
S 485-098
(8) Connect the test equipment.
(a) Use the PSD747-20 interconnect cables and connect the PSD747-21
circuit card adapter with the PSD747-2 SIGNAL connectors.
(b) Attach the PSD60-1 or PSD60-2 cables to these connectors:
NOTE: Make sure you attach the PSD747-2 test set and the____
PSD60-1 or PSD60-2 to the same aircraft ground. You
could cause stray capacitance values if you do not
ground the cables correctly.
1) LOZ and the HIZ connectors on the PSD747-2 test set
2) LOZ and HIZ connectors on the PSD60-1 or PSD60-2
calibration unit.
S 815-099
(9) Put the PSD747-2 PROBE SELECT switch to the position(s) given in
Figure 506 for the applicable compensator or tank unit.
NOTE: Each compensator or tank unit has a PROBE SELECT switch____
position. See Figure 506 for the correct compensator or tank
unit position on the switch. The switch positions will not
be the same for all the fuel tanks. Some of the PROBE SELECT
positions are not used.
S 815-100
(10)
Measure the capacitance for all of the tank units.
S 815-174
(11)
Measure the capacitance for the compensator.
S 815-175
(12)
Measure the insulation resistance for all of the tank units.
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A
747-400 MAINTENANCE MANUAL
S 815-176
(13)
Measure the insulation resistance for the compensator.
S 815-101 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 燃油 FUEL 4(108)
