1 28VDC is available at the aircraft connector 4023VC pin <C.
_ 2 A ground/earth is available at the aircraft connector 4024VC
_
 pin <J.

 (2) If 28VDC and the ground/earth is available at the aircraft connectors as specified above:
 - replace the Panel Assy-Refuel (800VU), (Ref. AMM TASK 28-25-55-000-001), and (Ref. AMM TASK 28-25-55-400-001).
 NOTE : If due to airline operational conditions it is not possible to
____ replace the Panel Assy-Refuel (800VU) and internal Trouble-shooting is required, go to Step (8).
 (3) If 28VDC is not available in Step (1)(b)1_:

 - check/reset/replace the C/B-FUEL/HI/LVL/SPLY (1QJ) at 121VU212.

 (4) Do the test given in Para. 3.A.

 (5) If the fault continues do a check (Ref. AWM 28-46-01), and (Ref. AWM 28-46-02) of the aircraft wiring:

 - between the C/B-FUEL/HI/LVL/SPLY (1QJ) and the refuel panel connector 4023VC pin <C

 - between the DC1 ground point and the refuel panel connector 4024VC pin <J.

 (6) Repair all the unserviceable wiring and connectors.

 (7) Do the test given in Para. 3.A.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A258
 May 01/05 CES

 (8) Panel Assy-Refuel (800VU) Internal Trouble-shooting, (Ref. AWM 28-46-02), and (Ref. AWM 28-46-03):
 (a) Check/replace the SWITCH-TEST/HIGH/LTS (2QJ) (part of 800VU).

 (b) Check/replace the diode between terminals 5 and 6 of diode module (4002VD) (part of 800VU).

 (c) Check/replace the INDICATOR-HI LVL/CTR (5QJ) (part of 800VU).

 (d) Check/repair the Panel Assy-Refuel (800VU) internal wiring as follows:

 - connector 4023VC, pin <C to terminal block 4001VT, terminal 5C

 - terminal block 4001VT, terminal 5H to IND-HI LVL/CTR (5QJ), terminal 4

 - IND-HI LVL/CTR (5QJ), terminal 5 loop connection to terminals III, II, and I

 - IND-HI LVL/CTR (5QJ), terminal I to terminal block 4001VT, terminal 4A

 - terminal block 4001VT, terminal 4F to diode module 4002VD, terminal 5

 - diode module 4002VD, terminal 6 to terminal block 4001VT, terminal 4E

 - terminal block 4001VT, terminal 4B to SW-TEST/HI/LIGHTS (2QJ), terminal 3A

 - SW-TEST/HI/LIGHTS (2QJ), terminal 1A to connector 4024VC, pin

 <J.

 (e) Install the Panel Assy-Refuel (800VU), (Ref. AMM TASK 28-25-55-400-001).

 (f) Do the test given in Para. 3.A.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A259
 May 01/05 CES

 TASK 28-46-00-810-823

 LEFT HI LVL Manual TEST
 WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
 1. Possible Causes
_______________
 - FLSCU-1 (7QJ)

 - FLSCU-2 (9QJ)

 - CTL PNL-REFUEL/DEFUEL (800VU)

 - HARNESS-CHAN A, L WING TK INR (13QT1)

 - SENSOR-HI LEVEL, LEFT WING TANK INNER CHANNEL A (17QJ1)

 - SW-TEST/LTS/HIGH (2QJ)

 - TANK HARNESS GROUP A (57QT)

 - aircraft wiring

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific multimeter
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 28-10-00-910-001 Safety Procedures When You Do Work in a Fuel Tank AMM 28-25-55-000-001 Removal of the Refuel Panel 800VU AMM 28-25-55-400-001 Installation of the Refuel Panel 800VU AMM 28-42-43-000-005 Removal of the Wing Tank Harness 57QT(58QT),
 63QT(64QT) AMM 28-42-43-000-006 Removal of the Wing-Tank Inner-Cell Group A Harness R 13QT1(13QT2) AMM 28-42-43-400-005 Installation of the Wing Tank Harness 57QT(58QT), 63QT(64QT) AMM 28-42-43-400-006 Installation of the Wing-Tank Inner-Cell Group A
 Harness 13QT1(13QT2) AMM 28-46-00-710-001 Test of the Tank High Level Sensing System AMM 28-46-15-000-001 Removal of the Wing-Tank Fuel-Level Sensors AMM 28-46-15-400-009 Installation of the Wing-Tank Fuel-Level Sensors AMM 28-46-34-000-001 Removal of the Fuel-Level Sensing Control-Unit
 (FLSCU) (7QJ,9QJ) AMM 28-46-34-400-001 Installation of the Fuel-Level Sensing Control-Unit (FLSCU) (7QJ,9QJ) AWM 28-46-01
　
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