Yamaha F75F - Assembling the PTT Motor; Checking the Brush

PTT motor
9-33
4. Check:
• Armature continuity
Out of specification  Replace
the arma-
ture.
Checking the brush
1. Measure:
• Brush length
Below specification  Replace
the brush.
2. Check:
• Circuit breaker continuity
No continuity  Replace.
Do not touch the bimetal “1”. Otherwise,
the operation of the circuit breaker can be
affected.
Assembling the PTT motor
Do not apply grease or oil to the commuta-
tor of the armature.
1. Install:
• Oil seal
“1”
2. Install:
• Spring
• Circuit breaker
• Brush holder
• Brush
• PTT motor lead
• Screw
• O-ring (to the motor base assembly)
Standard commutator undercut
1.50 mm (0.0591 in)
Wear limit
1.00 mm (0.0394 in)
Digital circuit tester
90890-03243
Armature continuity
“a” “b” “c” “d”
a. Standard brush length
b. Wear limit
Standard brush length
10.00 mm (0.3937 in)
Wear limit
3.5 mm (0.14 in)
a
b
c
d
b
a
1
New
1
New