Johnson C8000, Service Manual, Page: 17 / 28

17
No display on the console or the display is dim
Possible causes:
1. Console is damaged or the console cable is not connected properly.
2. Poor connection to all the terminals on the control board.
3. Controller is damaged.
4. Generator is damaged.
Fix:
1. First, unplug the console cable and use a multi-meter to check if
the voltage between the 1(Vcc) and 7(Ground) pin of the console
cable is greater than 12.
(If it is, replace the console and check again.
2. Open the side covers then check if all the wire harnesses are
connected properly to the terminals of the control board
3. Unplug the generator cable from the Controller and pedal the
machine to check if the voltage is variable.
If it is, replace the Controller with a new one.
If it is not, replace the generator with a new one.