Remedy: 3rd Roll Deck 1 Is the 3rd Roll Deck Opened? Yes Close it. Micro Switch DS3 2 Is the Micro Switch firmly pressed when you close the 3rd Roll Deck? No Replace the Micro Switch. Yes Install the 3rd Roll Deck to the machine properly. Signal Junction PCB (PW3599) 3 Check if all connectors of PW3599 are inserted properly. No Check whether or not any wire is broken between PW3599 and Paper Deck, or between PW3599 and DC Controller. Yes Replace PW3599. DC Controller (PW7720) 4 Is it cleared by replacing DC Controller? Yes Replace PW7720.
Code: U-04
Description: Internal Transportation Unit Open
Causes: Close the Internal Transportation Unit Note: When you twist the knob, confirm that the Click sound is made.
Remedy: Internal Transportation Unit 1 Is the Internal Transportation Unit opened? Yes Close it. (Confirm the click, when you twist the knob.) Photo Interrupter (PH24) 2 Is the Photo Interrupter interrupted properly by the Internal Transportation Unit? No Confirm if the Photo Interrupter is properly fixed. Yes 1. Confirm the connector and wiring. 2. If the wiring does not have the problem, replace the Photo Interrupter. DC Controller (PW7720) 3 Is it cleared by replacing DC Controller? Yes Replace PW7720.
Code: U-06
Description: Toner Cover Open
Causes: Close the Toner Cover
Remedy: Toner Cover 1 Is the Toner Cover Opened? Yes Close it. Micro Switch DS8 2 Check the voltage at J202-3 on the DC Controller (PW7720) with a multi-meter. When it is opened, 5Vdc. When it is closed, 0Vdc. No 1. Check the wiring between switch and DC Controller. 2. If the wiring does not have any problem, replace the switch. DC Controller (PW7720) 3 Is it cleared by replacing DC Controller? Yes Replace PW7720.
Code: U-11
Description: Manual Bypass Table Open
Causes: Close the Manual Bypass Table.
Remedy: Manual Bypass Table 1 Is the Manual Bypass Table opened? Yes Close it. DC Controller (PW7720) 2 Is it cleared by replacing DC Controller? Yes Replace PW7720.
Code: U-12
Description: Right Side Door Open
Causes: Close the Right Side Door
Remedy: Right Side Door 1 Is the Right Side Door opened? Yes Close it. Micro Switch DS7 2 Check the voltage at J202-2 on the DC Controller (PW7720) with a multi-meter. When it is opened, 5Vdc. When it is closed, 0Vdc. No 1. Check the wiring between switch and DC Controller. 2. If the wiring does not have any problem, replace the switch. DC Controller (PW7720) 2 Is it cleared by replacing DC Controller? Yes Replace PW7720.
Code: U-13
Description: Top Rear Cover Open
Causes: Close the Top Rear Cover
Remedy: Top Rear Cover 1 Is the Right Side Door opened? Yes Close it. Micro Switch DS6 2 Check the voltage at J202-1 on the DC Controller (PW7720) with a multi-meter. When it is opened, 5Vdc. When it is closed, 0Vdc. No 1. Check the wiring between switch and DC Controller. 2. If the wiring does not have any problem, replace the switch. DC Controller (PW7720) 2 Is it cleared by replacing DC Controller? Yes Replace PW7720.