TC reported TIMS showed obstacle detected at Front M2 car A1 door. Staff (LVR) checked and confirmedFront M2 car A1 door did not opened. Staff (LVR) isolated F ront M2 car A1 door in closed position. ~~~~~ * ,N *

'1. Fault confirmed/ Fault cannot be duplicated
Fault is duplicated in depot. When train was in depot, the doors were jammed ajar and stiff.Found
Door not fully close .
. Release handle -operated . DIRBS was activated

2. What was found from ER/ Fault Trace
From TIMS observed car 2632 FC 026 saloon door A1 Door open in Motion
From ER saw TC cycled doors multiple times with DIR unable to energise. Train was able to move off until DIRBS was triggered

3. Troubleshooting details
Probable Causal Factors
These are 5 identified causal factors based on FTA:

A. Door rollers
Likely
2632 A1 RHS  and LHS outer roller was found to be delaminated.

B. External obstruction
Unlikely
Checked guide and j-rails no signs of FOD. No signs of scratch marks on the guide rail.

C. Internal obstruction
Unlikely
Weather strips were checked to be in good condition. No door rubbing marks were observed. No abnormal sounds were heard during cyclic test.

D. Door Lock switch or door close switch faulty.
Unlikely
DIR and DMI able to extinguish during door cyclic test. DLS red line checked satis when door is closed. DLS cushion rubber intact. DCS distance from actuating plate satis. Door locking device went down fully after door close command.

E. Door motor faulty.
Unlikely
Motor was able to open and close doors with no abnormalities nor unusual sounds.

4. Rectification details
- Replaced main rollers on 2632  A1 RHS/LHS outer roller
- Door operation was smooth without wobbling. Cyclic test was OK with DIR/DMI able to extinguish.
- Door static test timing was within criteria.
- Door push/pull resistance force Satis.
- Door mating strip distance Satis.
- Serviced J-rail and guide rail preventively.
-Checked isolation lock  device function-Satis

DONE BY:SANKAR/AZLI/ZAIDI 19.09.2023