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_
 - if the REFILL float is visible, replace the can.
 (c) If the fault continues:
 - press the F/O RAIN RPLNT pushbutton switch and do a check for 28VDC at pin A/A of the F/O solenoid valve (3DB2).
 1 If there is 28VDC:
_
 - replace the SOL VALVE-RAIN RPLNT, F/O (3DB2) (Ref. AMM TASK 30-45-41-000-001) and (Ref. AMM TASK 30-45-41-400-001).
 2 If there is no 28VDC:
_
 - do a check for 28VDC at pin 1 of the F/O RAIN RPLNT pushbutton switch.
 a If there is 28VDC:
_
 - replace the P/BSW-RAIN RPLNT, F/O (2DB2).
 b If there is no 28VDC:
_
 - do a check for a ground signal at pin A/D and pin A/C of the F/O solenoid valve (3DB2) (Ref. ASM 30-45/01). . If there is no ground signal:
 * repair the wiring from the F/O solenoid valve (3DB2) pin A/B to the ground terminal and the wiring from the
 「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 : 001-049, 051-052, 054-056, 058-059, ∞∞30-45-00∞∞∞∞∞∞∞∞∞∞Page 212
 061-099, 101-101, 103-149, 151-199, 201-299, Aug 01/05 301-399, 401-499, CES

 F/O solenoid valve (3DB2) to the relay (10KS1), pin A/D
 to pin 8.
 . If the fault continues:

 * replace the RELAY-OIL LOW PRESS AND GROUND, ENG1
 (10KS1) and/or the RELAY-OIL LOW PRESS AND GROUND, ENG2
 (10KS2).
 . If there is a ground signal:

 * do a check of the wiring between the F/O solenoid valve
 (3DB2) pin A/A and the circuit breaker (1DB2).
 ** If there is no continuity, repair the above wiring.
 ** If there is continuity, replace the circuit breaker
 (1DB2).

 

 (2) If the circuit breaker is open:
 - close the circuit breaker.
 (a) If the circuit breaker trips:
 - replace the SOL VALVE-RAIN RPLNT, F/O (3DB2).
 1_ If the fault continues:
 - do a check for a short to ground at the wiring between the
 F/O solenoid valve pin A/A and the circuit breaker (1DB2)

 a If there is a short to ground:
_
 - repair the related wiring. 2 If there is no short to ground:
_ - replace the C/B-ANTI ICE/F/O/RAIN/RPLNT (1DB2).
 (b) If the circuit breaker stays closed and the fault continues:
 - replace the SOL VALVE-RAIN RPLNT, F/O (3DB2).
 C. Do the test given in Para. 3.
 「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 : 001-049, 051-052, 054-056, 058-059, ∞∞30-45-00∞∞∞∞∞∞∞∞∞∞Page 213
 061-099, 101-101, 103-149, 151-199, 201-299, Aug 01/05 301-399, 401-499, CES

 DRAIN MAST ICE PROTECTION - FAULT ISOLATION PROCEDURES
______________________________________________________
 TASK 30-71-00-810-801
 FWD Drainmast-Heater Failure
 1. Possible Causes
_______________
 - CONTROL UNIT (5DU)

 - DRAINMAST-FWD (4DU)

 - DEU-B (300RH1)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
23-73-00-810-827 DEU-B - Fault in DEU-B 300RHx with connected
 Systems/Devices AMM 23-73-47-000-001 Removal of the Decoder/Encoder Units (DEU) B 300RH AMM 23-73-47-400-001 Installation of the Decoder/Encoder Unit (DEU) B
 300RH AMM 30-71-00-710-001 Operational Test of the Drainmast Ice Protection AMM 30-71-34-000-001 Removal of the Waste-Water Ice-Protection
 Control-Unit AMM 30-71-34-400-001 Installation of the Waste-Water Ice-Protection
 Control-Unit AMM 30-71-51-000-001 Removal of the Drain Mast AMM 30-71-51-400-001 Installation of the Drain Mast ASM 30-71/01
 3. Fault Confirmation
__________________
 A. Do the operational test of the waste-water ice-protection system (Ref. AMM TASK 30-71-00-710-001).

 4. Fault Isolation
_______________

 A. If the fault message on the PTP 110RH shows 'DRAINMASTS HEATER FWD'and the green 'HTR' LED of the CONTROL UNIT 5DU does not come on:
 - replace the CONTROL UNIT (5DU) (Ref. AMM TASK 30-71-34-000-001) and (Ref. AMM TASK 30-71-34-400-001).
 (1) If the fault continues:

 - replace the DRAINMAST-FWD (4DU) (Ref. AMM TASK 30-71-51-000-001) and (Ref. AMM TASK 30-71-51-400-001).
 (a) If the fault continues:
 - do a check and repair the wiring between: CONTROL UNIT 5DU connector A/8 and DRAINMAST 4DU connector A/B, DRAINMAST 4DU connector A/C and GND, DRAINMAST 4DU connector A/A and GND (Ref. ASM 30-71/01).
　
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