Clean the large-current slipring and brush assemblies
Vacuum and de-burr the large-current slip ring, its four brush assemblies, and the surrounding covers and cables, then close out with a local-mode rotation test — the routine service that keeps abraded carbon-brush material from shorting the LCSR.
Tools & parts
| Item | Part number | Qty |
|---|---|---|
| Standard tools | n/a in source | 1 set |
| Vacuum cleaner | n/a in source | 1 |
| Brush (vacuum-cleaner nozzle attachment) | n/a in source | 1 |
| Rag | n/a in source | 1 |
| Cutter | n/a in source | 1 |
| Ruler | n/a in source | 1 |
| Torque wrench (M6 hexagonal socket head bolt) | rated 4.4 N·m — no part number in source | 1 |
| Brush alignment jig | BSX77-4283 (JIGU-LCSR) | 1 |
Safety
Hazard: High voltage present in the slip ring and the brushes
Consequence: Electric shock
Avoidance: Turn OFF all the breakers on the distribution board before it becomes necessary to touch the slip ring or the brushes
Hazard: Cleaning abraded brush material with alcohol; source labels this call-out "CAUTION" — reclassified NOTICE here because the stated outcome is an LCSR short circuit, not personal injury
Consequence: Abraded brush material solidifies in the slip ring groove, causing an LCSR short circuit
Avoidance: Do not use alcohol to clean the abraded brush material
Hazard: Mishandling the ring, cover, or brushes during this cleaning procedure — using sandpaper on brush burrs, forcing the cover against the ring, rough handling of the fragile brushes, abraded material left to fall into the gantry, off-center brush mounting, or a miswired cable; source labels this call-out "CAUTION" — reclassified NOTICE here because every listed outcome is equipment/procedure-quality, not personal injury
Consequence: Abnormal brush wear (if sandpaper grains enter the brushes), a damaged ring, damaged or broken brushes, contamination inside the gantry, or a misaligned/miswired brush assembly
Avoidance: Remove brush burrs with a cutter only — never sandpaper; take care not to force the ring when removing a cover; handle the brushes carefully and trim only their burrs; keep abraded material (powder) from falling into the gantry; center the brush assemblies on the ring using the alignment jig; verify the cable is connected correctly
Hazard: Abraded slip-ring brush material (carbon brushes containing a metallic element) generated throughout this cleaning procedure; source labels this call-out "NOTE" — reclassified CAUTION here as a personal-health precaution, not an equipment-only one
Consequence: Inhaling airborne abraded brush material
Avoidance: Thoroughly ventilate the work area and take protective measures such as wearing a protective mask before starting
Hazard: Performing other check/cleaning work with the dome cover removed after this cleaning procedure, without completing step (12) onward; source repeats this call-out twice — before step 1 and again after step 11
Consequence: Foreign matter such as dust or screw shavings falls on the ring, possibly resulting in slip ring discharge
Avoidance: Perform all of the check items described in step (12) onward of this procedure any time the dome cover is left off for other work
Hazard: A brush worn unevenly, left untrimmed before brush alignment; source labels this call-out "CAUTION" — reclassified NOTICE here as an equipment-only outcome
Consequence: A projection can form on the brush, resulting in a short circuit
Avoidance: Remove the projection using a cutter so the brush surface is even before performing brush alignment
Hazard: Using sandpaper to correct unevenness on a worn brush; source labels this call-out "CAUTION" — reclassified NOTICE here as an equipment-only outcome
Consequence: Sandpaper grains entering the brushes causes abnormal brush wear
Avoidance: Never use sandpaper to correct brush unevenness — use a cutter only
Hazard: Using a brush assembly mounting screw longer than specified; source labels this call-out "CAUTION" — reclassified NOTICE here as an equipment-only outcome
Consequence: Reduced clearance between the screw and the slip ring, possibly causing an LCSR short circuit
Avoidance: Use only the specified mounting screw (*6B6-20SDM, 20 mm long, fitted with SW6 and 2W6), confirmed with a ruler
Full step-by-step for Clean the large-current slipring and brush assemblies
All 21 steps are documented in the FSELIB Aquilion 16 (TSX-101A) service manual — re-authored, web-first, with the real figures from the source.
Open the full procedureRelated Gantry — Slip ring & brushes guides
Source: 2D201-061E*H p.100-106. Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.