Yamaha YB50 Service Manual page 146

2. The panel light does not light.
1. Bulb and bulb holder
• Check the bulb and bulb holder to see if
there is continuity.
2. Voltage
• Connect the pocket tester (20 V AC) on the
bulb holder coupler.
Cable (+) of the tester
Cable (–) of tester
• Place the main switch on "ON"
• Check if there is a voltage (12 V) in the
"Blue cable" of the connector of the bulb
holder.
The circuit is in good condition
3. The rear light does not light.
1. Bulb and bulb holder.
• Check the bulb and bulb holder for conti-
nuity.
2. Voltage
• Connect the pocket tester (20 V AC) in the
bulb holder connector
Cable (+) of the tester
Cable (–) of tester
• Place the main switch on "ON".
• Start engine.
• Check if there is a voltage (12 V on the
"Blue" cable of the bulb holder connec-
tor).
The circuit is in good condition.
CONTINUITY
Blue terminal
Black terminal
SATISFIES THE
SPECIFIED
VALUE(12 V)
CONTINUITY
.
Blue terminal
Black terminal
SATISFIES THE
SPECIFIED VALUE
(12 V)
LIGHTING SYSTEM
NO CONTINUITY
Replace the bulb and/or bulb holder.
OUTSIDE SPECIFIED VALUE
The connection circuit of the main switch to
the bulb holder connector is defective, repair
it.
NO CONTINUITY
Replace the bulb and/or bulb holder.
OUTSIDE SPECIFIED VALUE
The connection circuit of the main switch to
the bulb holder connector is defective, repair
it.
7-16
ELEC