OKI MPS4700
Troubleshooting. Abnormal MFP operation after powered on. No operation
| Check item | Checking | Action in case of fail |
|---|---|---|
| Checking power supplies | ||
| AC power supplied to the printer | Check the supplied voltage from the AC power source. | Supply AC power. |
| 5V and 24V power supplied to CU/PU board (MRM) | CU/PU board (MRM) Check the power supply using the POWER connector on the CU/PU board (MRM). 12, 13, 14pin: 24V 7pin: 5VS0 9, 10, 11pin: 0VP 8pin:0V |
Replace the low-voltage power supply. |
| 5V, and 24V power supplied to SU board (MSU) | Check the power supply using the POWER connector on the SU board (MSU). 1pin:5VS 2, 5, 6pin:0V 3, 4pin:24V |
Replace the low-voltage power supply. |
| Confirmation of the power switch LED | ||
| Power Switch LED | Confirm whether the LED is off. If the LED blinks rapidly, the number of blinking times in a cycleshows an error. The timing of blinking rapidly is shown in the below figure | Replace either of the power supply unit, the CU board (MRM), SWAssy (Front), the cables connected to the CU board and power supply unit or the cables connected to the CU board and SW-assy. In case of 2, 4, 8 or 10 times of LED blinking rapidly: Replace either of the power supply unit, the CU board (MRM), the cables connected to the power supply unit and the CU board. In case of 3, 6 or 9 times of LED blinking rapidly: Replace the CU board (MRM). |
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| Checking connections | ||
| Connection between lowvoltage power supply unit and CU/PU board (MRM) | Make sure the low-voltage power supply unit is connected to the POWER connector on the CU/ PU board (MRM) properly. Check whether the cable connector is half-connected or tilted, or whether wires are broken. Check whether there is any fault in the cable assembly, e.g., missing wires. |
Connect the cable properly. |
| Cable assembly connecting low-voltage power supply unit to CU/PU board (MRM) | Replace the cable with a good cable. | |
| Connection between lowvoltage power supply unit and SU board (MSU) | Do the checking as described in "Checking connections" | Refer to "Checking connections" |
| Cable assembly connecting low-voltage power supply unit to SU board (MSU) | ||
| Connection between CU/PU board (MRM) unit and SU board (MSU) | ||
| Cable assembly connecting CU/PU board (MRM) to SU board (MSU) | ||