Chapter 2 Replacement of Maintenance Parts > PCB/Power Supply Related
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4. Use a tester to measure the resistance between GND and the fuse after replacement.
• If the resistance is in the range from 0 Ω to several ohms, there is likely to be a short circuit ahead
of the fuse. Do the following:
(1) Disconnect the sensors, motors, Head, and cables connected to the PCB.
(2) Check once again to verify there are no short circuits. Reconnect each of the removed
components one by one. If you identify a short circuit, replace the component connected.
• Replace the entire PCB if removing all sensors, motors, and other components fails to
resolve the short circuit.
(3) Confirm that the short circuit has been eliminated. Turn the power back on.
• If a short circuit cannot be confirmed, take the following steps:
(1) Remove the component related to the immediate error. (Example: HD THERMIS [12] →
Remove the head.)
(2) If the fuse does not blow immediately after turning on power, replace the component removed.
(3) If the fuse blows once again, the short circuit is in a different component. Repeat the process
from the beginning.
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