OKI ES8431 Error Codes list and solutions

OKI ES8431 Error Codes list and solutions

– Compatible Printer model: OKI ES8431
– OKI ES8431 Error Code description:

• Code: 001
• Display: Service call 001: Error
• Description: Machine Check Exception hardware fault detection (board failure or poor power supply)
• Troubleshooting Guides: Replace the CU/ PU board.

• Code: 002 … 007
• Display: Power Off/On 002: Error to 007: Error PC: nnnnnnnn LR: nnnnnnnn FR: nnnnnnnn
• Description: CPU unexpected exception
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 009
• Display: Power Off/On 009: Error PC: nnnnnnnn LR: nnnnnnnn FR: nnnnnnnn
• Description: CPU unexpected exception
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 010
• Display: Power Off/On 010: Error PC: nnnnnnnn LR: nnnnnnnn FR: nnnnnnnn
• Description: CPU unexpected exception
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 011
• Display: Power Off/On 011: Error PC: nnnnnnnn LR: nnnnnnnn FR: nnnnnnnn
• Description: CPU unexpected exception
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 020
• Display: Service call 020: Error
• Description: CU Program ROM Hash Check Error
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 023
• Display: Service call 023: Error
• Description: CU Font ROM Hash error
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 030
• Display: Service call 030: Error
• Description: CU RAM Check Error
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 031
• Display: Service call 031: Error
• Description: CU Optional RAM Check Error
• Troubleshooting Guides: Is implementation of the RAM DIMM normal? Does replacement of the program RAM DIMM restore the printer?
  Re-implement the RAM DIMM. Replace the RAM DIMM. Replace the CU/ PU board.

• Code: 036
• Display: Service call 036: Error
• Description: CU RAM DIMM spec. is not supported.
• Troubleshooting Guides: Is the RAM DIMM genuine? Is implementation of the RAM DIMM normal? Does replacement of the program RAM DIMM restore the printer?
  Use a genuine RAM DIMM. Re-implement the RAM DIMM. Replace the RAM DIMM. Replace the CU/PU board (EEPROM replacement required).

• Code: 040
• Display: Service call 040: Error
• Description: CU EEPROM Error
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 042, 043, 045
• Display: Service call 042: Error~ 043: Error 045: Error
• Description: Flash File System Error
  Failed to access to the Flash ROM that is directly mounted on the CU board.
• Troubleshooting Guides: Failed to access to the Flash ROM that is directly mounted on the CU board. Format the Flash forcibly. (This requires caution as it erases NIC-F/W. The NIC-F/W must be written with the maintenance utility after formatting.) Execute system maintenance menu > MAINTENANCE MENU > FLASH FORMAT. After FLASH FORMAT is displayed, release the button and wait until the ON LINE is displayed (about 2 minutes). If the error remains, replace the CU/PU board.

Solve OKI ES8431 Error codes

• Code: 049
• Display: Service call 049: Error
• Description: Incompatibility between the CU and the engine head type (resolution)
• Troubleshooting Guides: 1) Replace the CU/ PU board with the one for the proper head. 2) Replace with a head of proper resolution.

• Code: 052
• Display: Power off/on 052: Error
• Description: A DMA Abort error was detected with the Image Processor.
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the CU/ PU board.

• Code: 067
• Display: Service call 067: Error
• Description: A communication error was detected during communication with the Sleep Mode interface supervisor program.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 068
• Display: Service call 068: Error
• Description: The Sleep Mode interface supervisor program was not found.
• Troubleshooting Guides: Does this error recur after power restoration? Yes Program writing by service personnel.

• Code: 069
• Display: Service call 069: Error
• Description: Malfunction of the NIC chip was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 070
• Display: Power off/on 070: Error
• Description: A PSE firmware error was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 072
• Display: Power off/on 072: Error.
• Description: Engine I/F Error. I/F error between PU and CU
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 073
• Display: Power off/on 073: Error
• Description: An error was detected during image data expansion.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 075
• Display: Power off/on 075: Error
• Description: An error was detected during image data expansion.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 077
• Display: Power off/on 077: Error
• Description: An error was detected during image data expansion.
• Troubleshooting Guides: Does this error recur? Yes Replace the CU/ PU board

• Code: 081
• Display: Service call 081: Error
• Description: Normal reading/ writing of EEPROM or Flash has become impossible.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 104
• Display: Service call 104: Error
• Description: The engine EEPROM implementation check at power on showed no problem, but after that a read/write error was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 106
• Display: Service call 106: Error
• Description: Abnormal engine control logic
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 111
• Display: Service call 111: Error
• Description: A duplex unit for another model was detected.
• Troubleshooting Guides: Is a duplex unit provided for this model installed? No Install a correct duplex unit.

• Code: 112
• Display: Service call 112: Error
• Description: A 2nd Tray for another model was detected.
• Troubleshooting Guides: Is a 2nd Tray provided for this model installed? No Install a correct 2nd Tray.

• Code: 113
• Display: Service call 113: Error
• Description: A 3rd Tray for another model was detected.
• Troubleshooting Guides: Is a 3rd Tray provided for this model installed? No Install a correct 3rd Tray.

• Code: 114
• Display: Service call 114: Error
• Description: A 4th Tray for another model was detected.
• Troubleshooting Guides: Is a 4th Tray provided for this model installed? No Install a correct 4th Tray.

• Code: 121
• Display: Service call 121: Error
• Description: High voltage power supply interface error
• Troubleshooting Guides: Is the cable connecting the CU board to the high voltage power supply unit connected properly? Is there any defective contact point?
  Re-connect them properly. Check for defective contact points of the high voltage system. Replace the high voltage power supply unit.

• Code: 122
• Display: Service call 122: Error
• Description: Low voltage FAN error
• Troubleshooting Guides: Is the FAN (bottom right of the front) of the low voltage power supply block working? Is the FAN connector connected correctly?
  Check to make sure connection of the FAN connector. Replace the low voltage power supply unit. Replace the FAN motor. Replace the low voltage power supply unit.

• Code: 123
• Display: Service call 123: Error
• Description: Abnormal environment humidity or unconnected humidity sensor
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the control panel board (PCQ board).

• Code: 124
• Display: Service call 124: Error
• Description: Abnormal environment humidity
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the control panel board (PCQ board).

• Code: 126
• Display: Power off/on 126: Error
• Description: Dew condensation in the printer was detected.
• Troubleshooting Guides: This error tends to occur after a printer is carried in from the outsides. Leave the printer for 2 hours to half a day at room temperature, and turn on the power. Does this error recur?
  After leaving the printer at room temperature, turn on the power again. Replace the control panel board (PCQ board).

• Code: 127
• Display: Service call 127: Error
• Description: Fuser FAN error
• Troubleshooting Guides: Is the FAN connector connected properly? Does this error recur?
  Re-connect it properly. Replace the FAN motor. Replace the CU/ PU board.

• Code: 128
• Display: Service call 128: Error
• Description: Fan motor abnormality 04: Belt FAN 05: Fuser side FAN 08: ID motor FAN
• Troubleshooting Guides: Is the cable to respective fans connected properly? Does this error recur? Does this error recur?
  Connect the FAN connector properly. Replace the FAN. Replace the CU/ PU board.

• Code: 131 … 134
• Display: Service call 131: Error to 134: Error
• Description: LED head detection error (131=Y, 132=M, 133=C, 134=K)
• Troubleshooting Guides: Is the LED head connected properly? Is the LED HEAD fuse brown? Does this error recur?
  Install the LED head unit properly. Check the LED HEAD fuse. Replace the fuse. Restore the power. Replace the LED head unit.

• Code: 142
• Display: Service call 142: Error
• Description: Image drum Up/Down position detection error
• Troubleshooting Guides: Is the image drum unit caught by anything when it is removed or re-installed? Does this error recur at power on? Is the cable connected properly?
  Re-install the image drum unit. Check connection through the CU/PU board, the relay connector, and the ID up/down clutch. Connect it properly. Replace the CU/ PU board.

• Code: 154
• Display: Service call 154: Error
• Description: The belt unit fuse blown out.
• Troubleshooting Guides: Is the belt unit connected properly? Does this error recur?
  Re-install the belt unit. Restore the power. After checking for cable connection, replace the CU/PU board.

• Code: 155
• Display: Service call 155: Error
• Description: The fuser unit fuse blown out.
• Troubleshooting Guides: Is the fuser unit installed properly? Does this error recur?
  After cleaning the connector of the fuser unit, re-install the fuser unit. Restore the power. After checking for cable connection, replace the CU/PU board.

• Code: 160 … 163
• Display: Service call 160: Error to 163: Error
• Description: Toner sensor detection error (160=Y, 161=M, 162=C, 163=K) This error does not occur with the factory default settings.
• Troubleshooting Guides: Is the toner cartridge installed? Is the lock lever of the toner set? Does this error recur?
  Install the toner cartridge. Move the lock lever of toner cartridge to the lock position. Replace the toner sensor assembly.

• Code: 166
• Display: Service call 166: Error
• Description: An abnormality was detected with the power supply temperature thermistor.
  01: Short 02: Open 03: High temp. 04: Low temp.
• Troubleshooting Guides: 01, 02: Does this error recur? Does this error recur? Does this error recur? Restore the power. Replace the low voltage power supply unit. Replace the CU/ PU board. Replace the cable between the low voltage power supply unit and the CU/PU board.
  03: Does this error recur? Remove anything obstructing the ventilation slots if any and restore the power. Replace the low voltage power supply unit. Replace the CU/ PU board. Replace the cable between the low voltage power supply unit and the CU/PU board.
  04: Does this error recur? Raise the room temperature and restore the power. Replace the low voltage power supply unit. Replace the CU/ PU board. Replace the cable between the low voltage power supply unit and the CU/PU board.

• Code: 167
• Display: Service call 167: Error
• Description: Temperature difference error with Upper Center Thermistor and Planar Heater Thermistor
• Troubleshooting Guides: Is the error message displayed? Does this error recur?
  Restore the power. Replace the fuser unit.

• Code: 168
• Display: Service call 168: Error
• Description: Planar Heater Thermistor Error
  01: Short 02: Open 03: High temp. 04: Low temp.
• Troubleshooting Guides: Is the error message displayed? Does this error recur?
  Restore the power. Replace the fuser unit.

• Code: 169
• Display: Service call 169: Error
• Description: Upper Side thermistor error
  01: Short 02: Open 03: High temp. 04: Low temp.
• Troubleshooting Guides: Is the error message displayed? Does this error recur?
  Restore the power. Replace the fuser unit.

• Code: 170, 171
• Display: Service call 170: Error, 171: Error
• Description: Short circuit or open circuit of the Upper Center Thermistor was detected.
• Troubleshooting Guides:
  Does this error recur? Yes Restore the power. Replace the fuser unit.

• Code: 172, 173
• Display: Service call 172: Error, 173: Error
• Description: An either temperature aberration (a hightemperature or cold temperature) of Upper Center Thermistor, Lower Thermistor, Upper Side Thermistor, Planar Heater Thermistor was detected.
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Replace the fuser unit.

• Code: 174, 175
• Display: Service call 174: Error, 175: Error
• Description: Short circuit or open circuit of the Lower Thermistor was detected.
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Replace the fuser unit.

• Code: 176, 177
• Display: Service call 176: Error, 177: Error
• Description: An abnormal (high or low) temperature of the Lower Thermistor was detected.
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Replace the fuser unit.

• Code: 181 … 184
• Display: Service call 181: Error to 184: Error
• Description: Option unit I/F error (181=Duplex Unit, 182 to 184=Optional Tray)
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Check to make sure the contact points of the connector and replace the optional unit.

• Code: 190
• Display: Power off/on 190: Error
• Description: System memory overflow
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Install an add-on RAM DIMM.

• Code: 200 … 202
• Display: Service call 200: Error to 202: Error
• Description: PU Firmware Download error
• Troubleshooting Guides: An error occurred during rewriting of the PU firmware. Restore the power and retry download. (This error doesn’t occur because this process is not performed in normal operation.)

• Code: 203, 204
• Display: Power off/on 203: Error, 204: Error
• Description: CU program error (not occur in normal operation)
  The CU program executed abnormal processing.
• Troubleshooting Guides: The CU program executed abnormal processing. Restore the power.

• Code: 207, 208
• Display: Power off/on 207: Error, 208: Error
• Description: CU program error (not occur in normal operation)
  The CU program executed abnormal processing.
• Troubleshooting Guides: The CU program executed abnormal processing. Restore the power.

• Code: 209
• Display: Power off/on 209: Download Error
• Description: Custom Media Type table downloading failed.
  Custom Media Type table downloading failed.
• Troubleshooting Guides: Custom Media Type table downloading failed. After turning on the power again, perform downloading again. (This error does not occur during the normal operation because this processing is not carried out in normal operation.)

• Code: 213, 214
• Display: Power off/on 213: Error, 214: Error
• Description: CU program error (not occur in normal operation)
  The CU program executed abnormal processing.
• Troubleshooting Guides: The CU program executed abnormal processing. Restore the power.

• Code: 230
• Display: Service call 230: Error
• Description: RFID Reader not Installed
• Troubleshooting Guides: RFID read device error Does this error recur? Yes Yes Check the FFC connecting the RFID R/W board and the CU/PU board. Replace the CU/ PU board and the RFID R/W unit (top cover).

• Code: 231
• Display: Service call 231: Error
• Description: 01: RFID Reader I/F Error
  05: K reader (TC/ID) – Tag interface connection error
  06: Y reader (TC/ID) – Tag interface connection error
  07: M reader (TC/ID) – Tag interface connection error
  08: C reader (TC/ID) – Tag Interface connection error
  11: K reader (TC/ID) – Tag interface connection error
  12: Y reader (TC/ID) – Tag interface connection error
  13: M reader (TC/ID) – Tag interface connection error
  14: C reader (TC/ID) – Tag interface connection error
• Troubleshooting Guides: 01: Is the FFC connected properly? Does this error recur? Does this error recur?
  Check the FFC connecting the RFID R/W board and the CU/PU board. Connect the FFC properly. Replace the CU/ PU board. Replace the RFID R/W unit (top cover).
  05 to 08, 11 to 14: Does this error recur after the power restoration? Does this error recur after the power restoration? Is the antenna cable connected properly? Is the antenna set in the holder correctly? Does this error recur after the power restoration?
  Move electronic equipment away from the printer is any on the printer, and restore the power. Replace the toner cartridge or ID of the indicated color. Check the antenna cable of the indicated color. Connect the cable properly. Adjust the antenna to the correct position. Replace the RFID R/W unit (top cover).

• Code: 232
• Display: Service call 232: Error
• Description: More than one image drum tag of the same color was detected.
• Troubleshooting Guides: Is more than one image drum installed? Yes Cycle the power. Replace the image drum in question.

• Code: 250
• Display: Power off/on 250: Error
• Description: An encrypted file erasing error was detected.
• Troubleshooting Guides: Did the user accept to execute Erase SD Card? Inform the user that it is necessary to execute Disk ERASE to restore the SD card defaults in order to delete the encrypted file.

• Code: 251
• Display: Service call 251: Error
• Description: An error was detected during SD Card Erase.
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Replace the SD card.

• Code: 254
• Display: Service call 254: Error
• Description: An unexpected error occurred during initialization in the Security mode.
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Regenerate an encryption key. If it doesn’t solve the problem, replace the CU/PU board or encrypted SD card.

• Code: 257
• Display: Service call 257: Error
• Description: An unexpected error occurred during initialization of the SD card.
• Troubleshooting Guides: Does this error message reappear? Yes Cycle the power. Format the SD card again. If it does not solve the problem, replace the SD card.

• Code: 901, 902
• Display: Power off/on 901: Error, 902: Error
• Description: Short circuit or open circuit with the bent thermistor was detected.
• Troubleshooting Guides: Is the belt thermistor cable connected properly? Does this error recur after power restoration?
  Re-connect the cable properly. Replace the belt thermistor.

• Code: 903, 904
• Display: Power off/on 903: Error, 904: Error
• Description: The belt thermistor detected abnormal (too high or too low) temperature.
• Troubleshooting Guides: Is the belt thermistor cable connected properly? Does this error recur?
  Re-connect the cable properly and restore the power. Replace the belt thermistor, after a lapse of 30 minutes, turn on the power.

• Code: 918
• Display: Power off/on 918: Error
• Description: Duplex FAN error
• Troubleshooting Guides: Does this error recur after power restoration? Does this error recur after power restoration? Does this error recur after power restoration?
  Check if the duplex unit is installed properly. Check if the FAN is connected properly. Replace the FAN.

• Code: 923
• Display: Power off/on 923: Error
• Description: The ID motor is not running normally.
• Troubleshooting Guides: Does this error message reappear after power restoration? Does this error message reappear after power restoration?
  Check if the image drum is installed properly. Replace the image drum unit. Replace the ID motor.

• Code: 928
• Display: Power off/on 928: Error
• Description: The fuser motor is not running normally.
• Troubleshooting Guides: Does this error message reappear after power restoration? Does this error message reappear after power restoration?
  Check if the fuser is installed properly. Replace the fuser. Replace the fuser motor.

• Code: 931
• Display: Power off/on 931: Error
• Description: Duplex unit CPU clock frequency error
• Troubleshooting Guides: Does this error message reappear after power restoration? Does this error message reappear after power restoration?
  Replace the unit. Replace the CU/ PU board.

• Code: 933
• Display: Power off/on 933: Error
• Description: Tray 2 CPU clock frequency error
• Troubleshooting Guides: Does this error message reappear after power restoration? Does this error message reappear after power restoration?
  Replace the unit. Replace the CU/ PU board.

• Code: 934
• Display: Power off/on 934: Error
• Description: Tray 3 CPU clock frequency error
• Troubleshooting Guides: Does this error message reappear after power restoration? Does this error message reappear after power restoration?
  Replace the unit. Replace the CU/ PU board.

• Code: 935
• Display: Power off/on 935: Error
• Description: Tray 4 CPU clock frequency error
• Troubleshooting Guides: Does this error message reappear after power restoration? Does this error message reappear after power restoration?
  Replace the unit. Replace the CU/ PU board.

• Code: 941
• Display: Power off/on 941: Error
• Description: A watch dog timer error was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 942
• Display: Power off/on 942: Error
• Description: An undefined interruption was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 943
• Display: Power off/on 943: Error
• Description: PU CPU ran away out of control due to noise etc.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 944
• Display: Power off/on 944: Error
• Description: Dcon circuit access failed.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 945
• Display: Power off/on 945: Error
• Description: SDRAM access at power on failed.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 980
• Display: Power off/on 980: Error
• Description: An abnormal temperature of the fuser unit was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the fuser unit.

• Code: 982
• Display: Service call 982: Error
• Description: Excessive trays beyond the specification are installed.
• Troubleshooting Guides: Are many trays beyond the specification installed? Yes Use trays as many as specified.

• Code: 983
• Display: Service call 983: Error
• Description: More than one toner cartridge tag of the same color was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the CU/ PU board.

• Code: 984
• Display: Service call 984: Error.
• Description: A format tag not matching with the K position was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the K toner cartridge or image drum.

• Code: 985
• Display: Service call 985: Error
• Description: A format tag not matching with the Y position was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the Y toner cartridge or image drum.

• Code: 986
• Display: Service call 986: Error
• Description: A format tag not matching with the M position was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the M toner cartridge or image drum.

• Code: 987
• Display: Service call 987: Error
• Description: A format tag not matching with the Cposition was detected.
• Troubleshooting Guides: Does this error recur? Yes Cycle the power. Replace the C toner cartridge or image drum.

• Code: 999
• Display: Service call 999: Error
• Description: The CU/PU firmware has a problem with its compatibility
• Troubleshooting Guides: Does an error occur at cycling the power? Yes Replace the CU/PU board or start printer by forced ONLINE (see Chapter 6) and rewrite the firmware.

• Code: F0C, FOD
• Display: Power off/on F0C, F0D: Error PC:nnnnnnnn LR:nnnnnnnn FR:nnnnnnnn
• Description: CU program error
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Replace the CU/ PU board.

• Code: FFE
• Display: Power off/on FFE: Error PC:nnnnnnnn LR:nnnnnnnn FR:nnnnnnnn
• Description: CU program error
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Replace the CU/ PU board.

• Code: FFF
• Display: Power off/on FFF: Error PC:nnnnnnnn LR:nnnnnnnn FR:nnnnnnnn
• Description: CU program error
• Troubleshooting Guides: Does this error recur? Yes Restore the power. Replace the CU/ PU board.

– Get more information about Epson XP 15000 troubleshooting, click here

– Get more error code list with quick guide to fix printer product, click here
– About get help with reseting Epson inkpad or others, click here

Waste Ink Pad Counter Utility Functions:

– Cleaning printhead.
– Ink charge.
– Fix Epson red lights blinking Error

– Fix Epson Service Required Error: A printer’s ink pad at the end of its service life Please contact Epson Support.

– Check the current value of waste ink counters and ink level counters.
– Clear Waste Ink Counters.
– Read and write serial number.
– Read and write USB ID.
– Read and write HEAD ID.
– Make EEPROM dump, backup.
– Paper feed test.
– Nozzle check.
– Color check pattern.
– Initialize (disable) PF deterioration offset.
– Retrieve device information

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