Troubleshooting The Ptt Unit - Yamaha F200B Service Manual

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Troubleshooting the PTT unit

Troubleshooting consists of the following 3 items:
Symptom 1: Specific trouble conditions
Symptom 2: Trouble conditions of an area or individual part
Cause: Trouble causes of symptom 2
— : Not applicable
Symptom 1: PTT unit does not operate.
Symptom 2
PTT relay does not
operate
PTT motor does not
operate
PTT fluid pressure
does not increase
4-25
Troubleshooting
Cause
Blown fuse (PTT switch)
PTT switch malfunction
PTT relay malfunction
Short, open, or loose
connection of the wiring
harness
PTT motor malfunction
Short, open, or loose
connection in PTT motor
circuit
—
Manual valve open
Insufficient PTT fluid
PTT fluid leakage
Air in PTT
Clogged fluid passage
Gear pump malfunction
Checking step
Check the fuse.
Check the PTT switch.
Check the PTT relay.
Measure the PTT switch input voltage.
Measure the PTT relay input voltage.
Check for continuity between the PTT
switch and the fuse holder.
Check for continuity between the PTT
switch and PTT relay.
Disassemble and check the PTT
motor.
Check for wiring continuity between
the PTT motor and the PTT relay
terminal.
Measure the PTT fluid pressure.
Check the manual valve.
Add sufficient PTT fluid.
Check the PTT fluid leakage.
Bleed the PTT unit.
Disassemble and check the PTT unit.
Check the filter for dirt and
obstructions.
Check the valves for damage.
Check the fluid passages for
obstructions.
Check the gear pump operation.
See
page
5-3
A-11
5-75
5-74
5-75
5-74
5-75
A-11
5-75
A-11
9-45
A-11
9-38
9-40
10-14
10-15
9-40
9-50
9-56
9-53
9-53
9-50
9-56
9-53