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Code :

Code: 688
Description: CTL_PRREQ_N signal does not come.
The ECB does not receive a memory address command from the controller 20 seconds after paper is in the position for registration.
Causes: Defective controller board. Communication error 1. Turn the machine's main power off, and then on. 2. Check if the controller board is firmly connected to the ECB.

Code: 820
Description: Scan lock error
By an unexpected reason, the controller error occurred.
Causes: Turn the machine's main power off, and then on.

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