C. Green Pin Sparks
  Possible Causes Remedies
4 Interpole field too strong Reduce interpole fields
5 Interpole field too weak Increase interpole fields
6 Interpole air gap too small Enlarge air gap - decrease effective interpole flux
7 Interpole air gap too large Reduce air gap - increase effective interpole flux
14 Mica proud Recess mica or use a more abrasive grade
15 High or low commutator segments Tighten, turn or regrind
16 Commutator too loose Tighten, use new mica and turn
17 Solderings interrupted Resolder tags
19 Flats on commutator or slipring Remove cause while turning or grinding
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
29 Radial brush holders not in correct position Adjust holder to radial position, distance from commutator 2 - 3mm
30 Reaction type holder mounted trailing Reverse holders or direction of rotation
36 Unequal alignment of holders Correct spacing and alignment of holders

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