R (b) If the resistance values are in the specified limits:
R - do a check of the wiring (Ref. ASM 24-23/01) for a short to
R ground, a short circuit or an open circuit between:

R . pin A/12 of the APU generator and pin C/10 of the GAPCU

R . pin A/13 of the APU generator and pin C/11 of the GAPCU

R . pin A/14 of the APU generator and pin C/9 of the GAPCU

R . pins C/9, C/10, C/11 and pin C/7 of the GAPCU.

R 1_ If the wiring is not correct:
R - repair or replace as necessary.

R 2_ If the wiring is correct:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001)
R and (Ref. AMM TASK 24-41-34-400-001).

R a_ If the fault continues:
R - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-R 001) and (Ref. AMM TASK 24-23-51-400-001).

R (2) If the CFDS message comes into view with the fault code 67:
R - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and
R (Ref. AMM TASK 24-23-51-400-001).

R (a) If the fault continues:
R - do a check of the wiring (Ref. ASM 24-23/01) for a short to
R ground, a short circuit or an open circuit between:

R . pin A/12 of the APU generator and pin C/10 of the GAPCU

R . pin A/13 of the APU generator and pin C/11 of the GAPCU

R . pin A/14 of the APU generator and pin C/9 of the GAPCU

R . pins C/9, C/10, C/11 and pin C/7 of the GAPCU.

R 1_ If the wiring is not correct:
R - repair or replace as necessary.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-23-00∞∞∞∞∞∞∞∞∞∞Page 233
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R  2_  If the wiring is correct:
R  - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) 
R  and (Ref. AMM TASK 24-41-34-400-001). 
R  B. Make sure that the aircraft electrical circuits operate correctly in APU 
R  configuration. 
R  (1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK 
R  24-41-00-861-002). 
R  (2) Let the APU generator operate for five minutes to make sure that it 
R  operates correctly. 
R  (3) De-energize the aircraft electrical circuits from the APU (Ref. AMM 
R  TASK 24-41-00-862-002).

R TASK 24-23-00-810-816

R Failure of the Status Circuit of the ELEC/APU GEN Pushbutton Switch R 1. Possible Causes
_______________
R - P/BSW-ELEC/APU GEN (2XS)
R - GAPCU (24XG)
R - wiring

R 2. Job Set-up Information

______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R  AMM  24-41-00-740-002  Operational Check of GAPCU via CFDS 
R  AMM  24-41-34-000-001  Removal of the Ground Auxiliary Power Control Unit 
R  (GAPCU) (24XG) 
R  AMM  24-41-34-400-001  Installation of the Ground Auxiliary Power Control 
R  Unit (GAPCU) (24XG) 
R  ASM  24-23/02 
R  3. Fault Confirmation__________________ 
R  A. Test 

R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R 4. Fault Isolation
_______________
R A. Table of the circuit breakers used in this procedure:
R -------------------------------------------------------------------------------R PANEL DESIGNATION IDENT. LOCATION R -------------------------------------------------------------------------------R 122VU ELEC/GAPCU 17XG W24
R B. If the BITE test gives the maintenance message PB SW ELEC GEN APU (2XS)/ R GAPCU (24XG):
R NOTE : After you do the trouble shooting for this fault, open and close
____ R the circuit breaker 17XG to remove all 28VDC power supply from the R GAPCU.
R - do a check of the wiring (Ref. ASM 24-23/02) for an open circuit or a R short to ground between:
R . pin A/1C of the GAPCU and pin A/D3 of the ELEC/APU GEN pushbutton R switch
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-23-00∞∞∞∞∞∞∞∞∞∞Page 235
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R  . pin A/4E of the GAPCU and pin A/D2 of the ELEC/APU GEN pushbutton 
R  switch 
R  . pin A/2G of the GAPCU and pin A/D1 of the ELEC/APU GEN pushbutton 
R  switch. 
R  (1) If the wiring is not correct: 
　
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