Yamaha YP400T Service Manual page 374

2. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness
side) as shown.
Positive tester probe → yellow/blue 1
Negative tester probe → black 2
Ch Dg Y
L
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of yellow/
blue 1 on the meter assembly coupler
(wire harness side).
• Is the voltage within specification?
YES
This circuit is OK.
SIGNALING SYSTEM
R/W R/G G
Y/L B/L Gy B
1 2
NO
Replace the meter
assembly.
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