Yamaha MM700F, Руководство по обслуживанию, Страница: 436 / 589

8-14
– +
ELEC
Inspection
1. Inspect:
•
Commutator (outer surface)
Dirty
→
Clean with #600 grit sandpaper 1 .
Hold the armature in a vise 2 and copper or
aluminium plate 3 .
CAUTION:
Lightly grip the armature with a vise.
2. Measure:
•
Commutator (diameter)
Measure the diameter
a
of the commutator at
points where the brush comes in contact.
Out of specification
→
Replace the starter
motor.
Commutator wear limit
a
:
27 mm (1.06 in)
3. Measure:
•
Mica (insulation depth)
1
(between commutator segments)
Out of specification
→
Scrape mica to proper
limits.
Use a hacksaw blade
2
that is ground to fit.
Mica undercut
a
:
0.6 mm (0.024 in)
4. Measure:
•
Armature coil resistance
(insulation/continuity)
Defect(s)
→
Replace the starter motor.
Inspecting steps:
•
Connect the pocket tester for the continuity
check
1
and the insulation check
2
.
•
Measure the armature coil resistances.
Armature coil resistance:
Continuity check
1
:
0.014 ~ 0.018
Ω
at 20°C (68°F)
Insulation check
2
:
More than 100 k
Ω
at 20°C (68°F)
•
If the resistance is incorrect, replace the starter
motor.
ELECTRICAL STARTING SYSTEM (VX700DX/VT700)
SCH8080
SCH8100
SCH8110
SCH8090