Yamaha F150B - Checking the PTT Motor; Checking the Brush

9-42
PTT motor
0
1
2
3
4
5
6
7
8
9
10
A
Checking the PTT motor
1. Check the commutator. Clean with 600
grit sandpaper and compressed air if dirty.
2. Measure the commutator diameter. Replace
the armature if below specification.
3. Check the armature continuity. Replace if
out of specification.
Checking the brush
1. Measure the length of each brush.
Replace the brushes if below specifica-
tion.
2. Check the brush and circuit breaker for
continuity. Replace if there is no
continuity. NOTICE: Do not touch the
bimetal b, otherwise the operation of
the circuit breaker can be affected.
Motor commutator standard diameter a:
22.0 mm (0.87 in)
Wear limit: 21.0 mm (0.83 in)
f
e
e
B
d
a
Digital circuit tester: 90890-03174
Armature continuity:
bcde
Motor brush standard length:
9.8mm (0.39in)
Wear limit a: 4.8 mm (0.19 in)
b
c
e
d
a
b