Description: Energizing has been carried in a wrong order. Communication conditions are defective.
Remedy: Turn off first the power to the plotter and host computer. Then, turn on the power to the host computer. Finally, turn on the power to the plotter. Check the communication conditions. Perform a loopback test to check whether the device normally operates. If the device maloperates, replace the CPU circuit board with a new one.
Code: 23
Display: ERROR 23 LOOPBACK S
Description: Signal line is in abnormal conditions.
Remedy: Connect the loopback connector. Replace the CPU circuit board with a new one.
Code: 24
Display: ERROR 24 LOOPBACK R
Description: No interruption takes place in data receiving.
Remedy: Connect the loopback connector. Replace the CPU circuit board with a new one.
Code: 25
Display: ERROR 25 LOOPBACK T
Description: No interruption takes place during data sending.
Remedy: Connect the loopback connector. Replace the CPU circuit board with a new one.
Code: 26
Display: ERROR 26 LOOPBACK D
Description: Data received is defective.
Remedy: Connect the loopback connector. Replace the CPU circuit board with a new one.
Code: 30
Display: ERROR 30 OPERATION
Description: An erroneous operation has been taken (such that SELF TEST is executed while the device is engaged in self test or COPY is executed while the device is engaged in copying).
Remedy: Point out the wrong operation. Replace the keyboard with a new one. Replace the CPU circuit board with a new one.