Ricoh M281 Series Service Manual page 560

Troubleshooting Guide
[B]: Abnormal mode: LEDs on the controller board
LEDs 1 to 8 blink constantly
Example:
No.
POSTCOD 1. For self-diagnosis code (BIOS).
E 1-8 2. After the BIOS starts up, LEDs 4,5,7 turn off and LEDs 1,2,3 ,6 turn on and LED
8 blinks. LED 8 is lit or off when there is a problem with the CPU.
BIOS LED - LED is lit when the BIOS is running.
- LED blinks when the OS is running.
[C]: Reconnecting and replacing the USB cable:

Reconnect the USB cable as shown below.
USB connector at the operation panel:

When connecting the cable, hold the molded part of the cable as shown below so as not to
apply excessive force on the connector part. Applying excessive force toward the upper
direction on the connector may cause connection failure.
D255/D256/M281/M282
Note
6-122
Rev. 02/09/2017
SM