B: Sparking at the leading edge
  Possible Causes Remedies
4 Interpole field too strong Reduce interpole fields
6 Interpole air gap too small Enlarge air gap - decrease effective interpole flux
8 Air gaps uneven (worn bearings) Replace bearings and realign machine
17 Solderings interrupted Resolder tags
19 Flats on commutator or slipring Remove cause while turning or grinding
23 Imperfect brush bedding Rebed brushes carefully and clean
26 Brush arc of contact excessive Reduce effective thickness of brush
27 Brush arc of contact insufficient Try with circumferential stagger or increase brush thickness
28 Sparking Check pressure, grade, holders, brush alignment, remove burns
30 Reaction type holder mounted trailing Reverse holders or direction of rotation
31 Brush sticking Check brush size - remove burns and dust;
35 Incorrect position of holder Adjust holder to correct position
36 Unequal alignment of holders Correct spacing and alignment of holders

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