Subaru Robin Power Products RGX180, RGX240D 9-3BRUSHES, 9-4AUR AUTOMATIC VOLTAGE REGULATOR

9-3 BRUSHES

The brushes must be smooth where they contact the slip rings. If not. polish the brushes smooth with sandpaper. X brush that is not smooth produces arcs between the brush and slip ring leading to possible damage.Usable brush lengths are from 5mm to ljmm as shown in Fig. 9-3. .a brush

shorter than 5mm must be replaced because decreasedcon-

15mm - 5mm

tact pressure between the brush and slip ring lowers genera- tor efficiency and output voltage.

Fig. 9-4

9-4 AUR (AUTOMATIC VOLTAGE REGULATOR)

AVR trouble may be identified -by simply looking at the AVR, or by checking the inter-lead resistance with a tester. or actu- ally mounting it in the generator and operating it.

9-4-l AUR TROUBLE IDENTIFICATION by APPEARANCE

If an AVR electronic part is burnt dark. or the surface epoxy resin melted, it often indicates .r\VR trouble.

9-4-2 IDENTIFYING AUR TROUBLE by CHECKING

INTER-LEAD RESISTANCE

Check the inter-lead resistance of the AVR with a tester. (See Fig. 9 -5 .) If the tester readings vary greatly from the values specified in the Table 9-I. rhe AVR is faulty.

NOTE: Take tester inaccuracy in to account in reading the tester.

TESTER

Fig. 9-5

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