RELAY (9HG) connector A/Z and GND,
 RELAY (9HG) connector A/1 and ZC (8HK) connector AB/1D,
 RELAY (9HG) connector A/A and GND.

R **ON A/C 401-499,
 A. If the test gives the maintenance message RECIRC FAN 1(15HG) AND 2(14HG) OR SPLY:
 - remove the access panels 131PW, 131NW and 132PW (Ref. AMM TASK 25-55-12-000-001),

 - visually inspect the mixer unit ducts for damage (pay special attention to the lateral seams of the ducts).

 (1) If you find damage then you must replace the mixer unit (Ref. AMM TASK 21-21-43-000-001) and (Ref. AMM TASK 21-21-43-400-002).

 (2) If there is no damage,

 - make sure that the recirculation filter (4012HM, 4013HM) housings and the adjacent areas are clean,

 - remove the FILTER-RECIRCULATION (4012HM) (Ref. AMM TASK 21-21-41-000-001),

 - remove the FILTER-RECIRCULATION (4013HM) (Ref. AMM TASK 21-21-41-000-001).

 (3) If the recirculation fans (14HG, 15HG) operate correctly:

 - do a check of the recirculation filters (4012HM, 4013HM) for contamination.
 (a) If the filters are clogged:

 - replace the FILTER-RECIRCULATION (4012HM) (Ref. AMM TASK 21-21-41-000-001) and (Ref. AMM TASK 21-21-41-400-001),

 - replace the FILTER-RECIRCULATION (4013HM) (Ref. AMM TASK 21-21-41-000-001) and (Ref. AMM TASK 21-21-41-400-001).

 (b) If the filters are not clogged:

 - install the FILTER-RECIRCULATION (4012HM) (Ref. AMM TASK 21-21-41-400-001).

 - install the FILTER-RECIRCULATION (4013HM) (Ref. AMM TASK 21-21-41-400-001).

 (4) If the recirculation fans (14HG, 15HG) do not operate:

 - do a check of the P/BSW-VENTILATION/CAB FANS (4HG) and replace it if necessary (Ref. ASM 21-21/01).
 (a) If the fault continues:
 - do a check of the RELAY-FAN FAULT SUPPRESS (16HG) and replace it if necessary (Ref. ASM 21-21/01).
 「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 : ALL ∞∞21-21-00∞∞∞∞∞∞∞∞∞∞Page 208
 Aug 01/05 CES

R  (b) If the fault continues: 
R  - do a check of the RELAY-L FAN POWER (5HG) and replace it if 
R  necessary (Ref. ASM 21-21/01), 
R  - do a check of the RELAY-R FAN POWER (6HG) and replace it if 
R  necessary (Ref. ASM 21-21/01). 
R  (c) If the fault continues: 
R  - do a check of the RELAY-L FAN CONTROL (7HG) and replace it if 
R  necessary (Ref. ASM 21-21/01), 
R  - do a check of the RELAY-R FAN CONTROL (8HG) and replace it if 
R  necessary (Ref. ASM 21-21/01). 
R  (d) If the fault continues: 
R  - do a check of the RELAY-L FAN FAULT (10HG) and replace it if 
R  necessary (Ref. ASM 21-21/01). 
R  - do a check of the RELAY-R FAN FAULT (9HG) and replace it if 
R  necessary (Ref. ASM 21-21/01). 
R  (e) If the fault continues: 
R  - replace the FAN RECIRCULATION (15HG) (referred to as FAN 
R  (15HG)) (Ref. AMM TASK 21-21-51-000-001) and (Ref. AMM TASK 21-
R  21-51-400-001), 
R  - replace the FAN-RECIRCULATION (14HG) (Ref. AMM TASK 21-21-51-
R  000-001) and (Ref. AMM TASK 21-21-51-400-001). 
R  (f) If the fault continues: 
R  - do a check and repair the wiring (Ref. ASM 21-21/01) and (Ref. 
R  ASM 21-63/01) from: 
R  - the FAN (15HG) to the CB (1HG), 
R  - the FAN (15HG) to the CB (2HG), 
R  - the FAN (15HG) to ground, 
R  - the FAN (14HG) to the CB (3HG), 
R  - the FAN (14HG) to the CB (11HG), 
R  - the FAN (14HG) to ground, 
R  - the RELAY (7HG) to the RELAY (5HG), 
R  - the RELAY (7HG) to ground, 
R  - the RELAY (10HG) to the RELAY (5HG), 
R  - the RELAY (10HG) to ground, 
R  - the RELAY (10HG) to the ACSC1 (47HH), 
R  - the RELAY (16HG) to the SW (4HG), 
R  - the RELAY (16HG) to ground, 
R  - the RELAY (8HG) to the RELAY (6HG), 
R  - the RELAY (8HG) to ground, 
R  - the RELAY (9HG) to the RELAY (6HG), 
　
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