OKI MC363
Troubleshooting. LCD Display Trouble
LCD displays nothing
| Check item | Checking method | Action |
|---|---|---|
| Checking connections | ||
| Connection between the printer and AC power supplied | Check the connection between the printer and AC power supplied. | Connect the AC cable properly. |
| Cable assembly connecting low-voltage power supply unit to CU/PU board | Make sure the low-voltage power supply unit is connected to the POWER connector and SP connector on the CU/PU board properly. Check whether the cable connector is half-connected or tilted. | Connect the cable properly. |
| Check whether there is any fault in the cable assembly, e.g., missing wires. | Replace the cable with a good cable. | |
| Connection between CU/PU board and SU board | Make sure the 16-pin FFC is connected to the OPE_OPM connector on the CU/PU board properly. Make sure the 16-pin FFC is connected to the OPE1 connector on the SU board properly. Check whether the cable connector is half-connected or tilted. |
Connect the FFC cable properly. |
| Check for broken wires using a tester. Check visually whether the sheath peels. |
Replace the FFC cable with a good cable. | |
| Connection between SU board and OPM board | Make sure the 16-pin FFC is connected to the OPE2 connector on the SU board properly. Make sure the 16-pin FFC is connected to the CN1 connector on the OPM board properly. Check whether the cable connector is half-connected or tilted. |
Connect the FFC cable properly. |
| Check for broken wires using a tester. Check visually whether the sheath peels. | Replace the cable with a good cable. | |
| Checking power supplies | ||
| AC power supplied to CU/PU board | Check the supplied voltage of the connector on the CU/PU board. A)POWER connector 1, 2, 3pin: 5V 4, 5, 6pin: 0V B)SP connector 1pin: 3.3V 2pin: 0V |
Replace the low-voltage power supply. Replace the POWER cable or SP cable. |
| AC power supplied to SU board | Check the supplied voltage of the OPE1 connector on the SU board. 3pin: 3.3V 16pin: 5V 5, 15pin: 0V |
Replace the CU/PU board or OPE1_FFC cable. |
| AC power supplied to OPM board | Check the supplied voltage of the CN1 connector on the OPM board. 14pin: 3.3V 1pin: 5V 2, 12pin: 0V |
Replace the SU board or FFC cable. |
| AC power supplied to LCD | Check the supplied voltage of the CN501 connector on the OPM board. 12pin: 3.3V 29pin: 5V 11, 30pin: 0V |
Replace the OPM board or LCD. |
| Checking LSI operation | ||
| I/F signal from CU/PU board to OPM board | Check whether signals are output to the OPE_OPM connector on the CU/PU board. 9pin: Transmission data 11pin: Clock 13pin: Enabling 15pin: Reset Signals should be always output under normal conditions. |
Replace the CU/PU board. |
| Display of OKI logo. Operation panel display does not change. | ||
| Operation panel display | OKI logo stays on. | Replace the CU/PU board. |
| Error message display | ||
| Error message display | Check the detail of the error on the error message list. | Follow the instructions. |