Yamaha F40B - Checking the PTT Motor

67C3K11 7-36
1
2
3
4
5
6
7
8
9
6. Remove the brush holder screws B,
brushes C, brush springs D, and oil seal
from the PTT motor base 9.
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 specifica-
tion.
3. Measure the commutator undercut a.
Replace the armature if below specifica-
tion.
4. Check the armature for continuity.
Replace the armature if out of specifica-
tion.
5. Check the bearing. Replace the armature
if damaged.
PTT motor commutator standard
diameter: 16.5 mm (0.65 in)
Wear limit: 15.5 mm (0.61 in)
S67C7064
D
C
D
9
B
B
S6AU7066
S6AU7067
PTT motor commutator standard
undercut a: 1.00 mm (0.039 in)
Wear limit: 0.50 mm (0.020 in)
Armature continuity
Checking point Continuity
Commutator segments b Yes
Segment – Armature core c No
Segment – Armature shaft d No
S6AG7087
b
c
d
PTT motor