Samsung ML-5000A Service Manual page 37

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4-4-3 Diagnostic Mode

When the printer malfunction occurs and DCU displays Error Status Code, you can use the Diagnostic Mode to

find a problem and fix it.

DIAGNOSTIC CODE

When you fix the malfunction, you can make only a unit of machine operated in Diagnostic mode. To enter

Diagnostic mode, push three buttons ( [DOWN], [SHIFT], [STOP] ) simultaneously and turn the printer power

on. When the DCU displays Ô78Õ, release the keys in 2-3 seconds, then the DCU displays Ô00Õ. By using [UP] or

[SHIFT] and [DOWN] keys, select the desired Diagnostic Code, and push the [ENTER] key to perform the

operation. To stop its operation, push the [SHIFT] and [ENTER] buttons.

MAIN MOTOR OPERATING SYSTEM

Only main motor turns continuously.

MAIN HIGH VOLTAGE ON

There is output of -1400V to MHV terminal.

TRANSFER HIGH VOLTAGE (-) ON

There is output of -800V to THV terminal.

THV (+) REFERENCE ON

There is output of +800V to THV terminal.

DEV/SUPPLY HIGH VOLTAGE & PTL ON

There are output DEV and SUPPLY high voltage to each HV terminals, the PTL lights. At this

time, the left one of three LEDs (Diagnostic Mode Indicator) in the DCU lights, and DEV HV is -

300V. To change this voltage, push the [UP] button, and two (center and right) of three LEDs light,

there are output -350V to DEV HV terminal.

LSU OPERATING SYSTEM

The scanning motor in LSU turns and the right one of three LEDs lights. To check the LD (Laser

Diode) in the LSU at this state, push the [UP] button, the LD is driven, and the center LED lights.

If the LD is normal, all three LEDs light.

PICKUP CLUTCH ON

The solenoid in machine operate. To release the solenoid, push the [SHIFT] and [ENTER] buttons.

PEMPTY/PWIDTH/NEW CRU SENSOR TEST

When you make the actuator of PEMPTY/PWIDTH sensor operate, the left or right one of three

LEDs lights. If you set new CRU in the machine in this mode, the right LED lights.

FEED & EXIT SENSOR TEST

The feed & exit sensor also can be tested by the same method of the code Ô06Õ.

Samsung Electronics

Troubleshooting

4-17

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