Yamaha F50D Servise Manual page 313

Disassembling the PTT motor
1. Remove the bolts 1, and then remove
the york 2, armature 3, and PTT motor
base 4.
1
4
2. Remove the screws 5, and then remove
the brush holder assembly 6 from the
PTT motor base.
5
Checking the PTT motor
1. Check the commutator. Clean with 600
grit sandpaper and compressed air if
dirty.
2
1
3
5
6
2. Measure the commutator diameter a.
Replace if below specification.
1
a
Digital caliper 1: 90890-06704
Commutator diameter wear limit a:
21.0 mm (0.83 in)
3. Check the armature
Replace if out of specification.
b
c
Armature continuity:
b c
PTT motor
for continuity.
d e
10
d e
9-34
0
1
2
3
4
5
6
7
8
9
A