9-3 BRUSHES
The brushes must be smooth where they contact the slip rings. If not, polish smooth the brushes with sandpaper. A brush that is not smooth produces arcs between the brush and slip ring leading to possible damage.Usable brush lengths are from 5 mm to 15 mm as shown in Fig. 9
9-4 AVR (AUTOMATIC VOLTAGE REGULATOR)
r
Fig.
AVR trouble may be identified.by simply looking at the AVR, or by checking the
9-4-l AVR TROUBLE IDENTIFICATION by APPEARANCE
If an AVR electronic part is burnt dark, or the surface epoxy resin melted, it often indicates indicates AVR trouble.
9-4-2 IDENTIFYING AVR TROUBLE by CHECKING
INTER-LEAD RESISTANCE
Check the
NOTE: Take tester inaccuracy in to account in reading tie tester.
TESiER
Fig