Toyota Supra 1990 Manual page 366

ST-6
Continuity
No continuity
STARTING SYSTEM - Starter
ST0040
ST0199
ST0200
ST0019
4. INSPECT UNDERCUT DEPTH OF SEGMENT
Check that the undercut depth is clean and free of foreign
material. Smooth out the edge.
Standard undercut depth: 0.6 mm (0.024 in.)
Minimum undercut depth: 0.2 mm (0.008 in.)
If the undercut depth is less than minimum, correct it with
a hacksaw blade.
Field Frame (Field Coil)
1. INSPECT FIELD COIL FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity between
the lead wire and field coil brush lead.
If there is no continuity, replace the field frame.
2. INSPECT THAT FIELD COIL IS NOT GROUNDED
Using an ohmmeter, check that there is no continuity be-
tween the field coil end and field frame.
If there is continuity, repair or replace the field frame.
Brushes
INSPECT BRUSH LENGTH
Using vernier calipers, measure the brush length.
Standard length: 15.5 mm (0.610 in.)
Minimum length: 10.0 mm (0.394 in.)
If the length is less than minimum, replace the brush holder
and field frame.
Brush Springs
INSPECT BRUSH SPRING LOAD
Take the pull scale reading the instant the brush spring
separates from the brush.
Standard installed load:
1,785 - 2.415 kg (3.9 - 5.3Ib,18 - 24 N)
Minimum installed load:
1.2 kg (2.6 Ib, 12 N)
If the installed load is less than minimum, replace the brush
springs.