W DOC AIRBUS | TSM A320F

Lavatory Signs - The Occupied or Unoccupied Symbol in the Lavatory Lighted Sign does not come on

TASK 33-26-00-810-802-A
Lavatory Signs - The Occupied or Unoccupied Symbol in the Lavatory Lighted Sign does not come on

1. Possible Causes
  • LAMPS
  • SIGN-LAVATORY OCCUPIED [3WJ]
  • MICRO SWITCH LAVATORY [2WJ]
  • WIRING
  • C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ]
  • SIGN-LAVATORY OCCUPIED [13WJ]
  • SWITCH-LAVATORY OCCUPIED (7WJ)
  • SWITCH-LAVATORY OCCUPIED (9WJ)
  • [5WJ]
  • [8WJ]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 33-26-00-710-001
Operational Test of the Lavatory Lighted Signs WJ
ASM 332601
AMM 33-26-11-000-001
Removal of the Lavatory Door Microswitch (WJ)
AMM 33-26-11-400-001
Installation of the Lavatory Door Microswitch (WJ)
AMM 33-26-23-000-001
Removal of the Lavatory-Occupied Signs (WJ)
AMM 33-26-23-400-001
Installation of the Lavatory-Occupied Signs (WJ)
3. Fault Confirmation
Subtask 33-26-00-710-051-A
A. Do the operational test of the Lavatory Lighted Signs AMM 33-26-00-710-001.
4. Fault Isolation
Subtask 33-26-00-810-051-A
A. If the test shows that no LAMPS in the red occupied pictorial symbol of the FWD SIGN-LAVATORY OCCUPIED [3WJ] come on:
  • make sure that the FWD lavatory door is closed and locked,
  • do a check for 28 VDC at the LAMPS ASM 332601.
   (1) If there is 28 VDC:
   (2) If there is no 28 VDC:
   (3) If the fault continues:
  • do a check and repair the WIRING between:
    C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ] and MICRO SWITCH LAVATORY [2WJ] pin C,
    MICRO SWITCH LAVATORY [2WJ] pin NO and SIGN-LAVATORY OCCUPIED [3WJ] pin 3+,
    SIGN-LAVATORY OCCUPIED [3WJ] pin 2- and GND
    ASM 332601
Subtask 33-26-00-810-053-A
B. If the test shows that no LAMPS in the green unoccupied pictorial symbol of the FWD SIGN-LAVATORY OCCUPIED [3WJ] come on:
  • make sure that the FWD lavatory door is not locked,
  • do a check for 28 VDC at the LAMPS ASM 332601.
   (1) If there is 28 VDC:
   (2) If there is no 28 VDC:
   (3) If the fault continues:
  • do a check and repair the WIRING between:
    C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ] and MICRO SWITCH LAVATORY [2WJ] pin C,
    MICRO SWITCH LAVATORY [2WJ] pin NF and SIGN-LAVATORY OCCUPIED [3WJ] pin 1+,
    SIGN-LAVATORY OCCUPIED [3WJ] pin 2- and GND ASM 332601.
Subtask 33-26-00-810-060-A
C. If the test shows that no LAMPS in the red occupied pictorial symbol of the AFT SIGN-LAVATORY OCCUPIED [13WJ] come on:
  • make sure that the AFT lavatory doors are closed and locked,
  • do a check for 28 VDC at the LAMPS ASM 332601.
   (1) If there is 28 VDC:
   (2) If there is no 28VDC:
   (3) If the fault continues:
   (4) If the fault continues:
  • do a check of the [5WJ] and replace it if necessary.
   (5) If the fault continues:
  • do a check of the [8WJ] and replace it if necessary.
   (6) If the fault continues:
  • do a check and repair the WIRING between:
    C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ] and SWITCH-LAVATORY OCCUPIED (9WJ) pin C,
    SWITCH-LAVATORY OCCUPIED (9WJ) pin NO and [5WJ] pin X,
    [5WJ] pin Z and GND,
    C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ] and SWITCH-LAVATORY OCCUPIED (7WJ) pin C,
    SWITCH-LAVATORY OCCUPIED (7WJ) pin NO and [5WJ] pin A/A,
    [5WJ] pin A/2 and [8WJ] pin A/X1,
    [8WJ] pin A/X2 and GND,
    C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ] and [8WJ] pin A/A2,
    [8WJ] pin A/A1 and SIGN-LAVATORY OCCUPIED [13WJ] pin 3+ ASM 332601.
Subtask 33-26-00-810-061-A
D. If the test shows that no LAMPS in the green unoccupied pictorial symbol of the AFT SIGN-LAVATORY OCCUPIED [13WJ] come on:
  • make sure that the AFT lavatory doors are not locked,
  • do a check for 28 VDC at the LAMPS ASM 332601.
   (1) If there is 28 VDC:
   (2) If there is no 28VDC:
   (3) If the fault continues:
   (4) If the fault continues:
  • do a check of the [5WJ] and replace it if necessary.
   (5) If the fault continues:
  • do a check of the [8WJ] and replace it if necessary.
   (6) If the fault continues:
  • do a check and repair the WIRING between:
    C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ] and [8WJ] pin A/A2,
    [8WJ] pin A/A3 and SIGN-LAVATORY OCCUPIED [13WJ] pin 1+,
    SIGN-LAVATORY OCCUPIED [13WJ] pin 2- and GND ASM 332601.
Subtask 33-26-00-710-052-A
E. Do the test as given in the Para. 3. A.
5. Close-up
Subtask 33-26-00-860-050-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:40:21 UTC
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