Code :

Code: 3-050
Description: ENGINE ERROR or PLEASE WAIT message on the LCD of the operator panel or monitor screen.
Causes: 1. Harness between the engine and control boards. 2. Engine board. Defective interface between the engine and control boards(DCU error code 78)
Remedy: 1. Check the harness between the engine and control boards. 2-1. Check if the engine board works properly when the printer resets. U5 pin 1 should be below 0.7V for about 122 ms after power on, then remain over 3.5V. - Check U5 pin 2 = approx. 3.8V. If so, check R54 or R55. - Check U5 pin 3 = approx. 4V. If so, check R53, R56, or C35. - If the voltages are normal, and U5 pin 1 is below 0.7V, replace U5. - If all are normal, check CPU pin 55. If OK, replace CPU. 2-2. Check X1 oscillation (6.94407MHz). 2-3. Replace EPROM in the Engine board. 2-4. If all above are OK, replace CPU.

Code: 3-060
Description: While printing, ‘MEMORY OVERFLOW’ message displays on monitor screen.
Causes: Control boards. Insufficient printer memory.
Remedy: Install optional SIMM memory in the control boards.

Code: 3-080
Description: Main motor not driving while printing, and paper not feeding into printer, resulting ‘JAM 0’.
Causes: Engine board. 1. Motor harness may be defective. 2. R7 changed value. 3. U1 defective.
Remedy: 1. Check the motor harness. If defective or damaged, replace. 2. Check R7=5.6kohm or 1kohm. Replace with 5.6Kohm. 3-1. Perform DCU diagnostic mode 00 and check the motor. 3-2. In DCU mode 00, check for pulses at U1 pin 5 and pin 14. If not, check related parts. 3-3. In DCU mode 00, check U1 pins 2 and 11 are over 4V. If the pins are below 1V, check Q2, D3 and D8. 3-4. If all above are OK, replace U1.

Code: 3-090
Description: While operating, high level sound
Causes: LSU, Motor bracket, Impella, Developer, gear, Fuser, foreign substance, etc. 1. LSU motor , Main motor bracket or wiring Developer or Fuser gears Foreign substance
Remedy: Replace the LSU Check Main motor bracket or wiring Pick-up ass’y’s rolls Reassemble or replace the Developer and the Fuser

Code: 3-100
Description: When system power is turned on, the printer does not turn on.
Causes: Engine board. 1-1. Harness between engine and control boards. 1-2. Defective harness between the control board and panel. 1-3. Fuse F151 2-1. Fuse F101
Remedy: 1-1. Check the harness between engine and control boards. If defective or damaged, replace. 1-2. Check the harness between control board and operator panel. If defective or damaged, replace. 1-3. Check F151 on the engine board. If open, measure the resistance between 5V and ground. If below50ohm, it is shorted. 2-1. Check F101 on the engine board. If open, check : - open R114 - Q102 shorted D-S, G-D, G-S - Defective DB101

Code: 3-110
Description: When printing, vertical line gets curved.
Causes: LSU and Engine board. 1. For LSU, +24V supply is unstable in the Engine board 2. Difference according LSU vendors.
Remedy: If the Q9 is KSE171, replace it to KSB1151. Check the capacitor between CN3#5 and JP60: 100nF. Check the resistor between Q5#collector and JP92: 12.1Kohm

Code: 3-120
Description: When turning on, all LED are continuously lightening.
Causes: Fuser, LSU, Engine board. 1. Fuser error 2. Paper is broken behind transfer roller. 3. Connectivity between Engine board and Video Controller.
Remedy: 1. Replace the Fuser. 2. Replace the LSU. 3. Check the wiring between the Engine board and the Video Controller.

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