E150 Neither thermistor nor trimmer resistance is connected to the head. (The head is not connected.) E151 The thermistor of the head is open-circuited. E152 The thermistor of the head is short-circuited. E153 The trimmer resistance of the head is open-circuited. E154 The trimmer resistance of the head is short-circuited. E155 The trimmer resistance of the head is out of specifications. E156 When a specific voltage is applied to the head, the voltage of the head is not changed within a specific time. E157 The voltage of the head is out of the specifications. E160 The temperature of the head does not reach a specific temperature within a specific time. E161 The temperature of the head exceeds a specific temperature. E170 When the pulse motor for the head scan is driven, it cannot be detected by a sensor within a specific time. E171 The motor is not connected to the pulse motor driver PCB for the head scan. E172 The gate array employed to drive the pulse motor for head sca...

E101 The AF motor of the laser unit is faulty. E102 The light intensity of the laser does not reach a specific level. E110 The polygonal scanner motor does not reach a specific speed within a specific time. E111 The polygonal cooling fan does not rotate properly. E120 The temperature of the laser does not reach a specific value. E121 The stoppage of the laser cooling fan is detected. E140 The movable guide motor is turned ON, and a specific position cannot be detected within a specific time. E141 1. The capping motor is turned ON, and a specific position cannot be detected within a specific time. 2. A specific position of the cam sensor for the recovery system cannot be detected within a specific time. E142 The pressure position switching motor is turned ON, and a specific position cannot be detected within a specific time. E143 The intake switching motor is turned ON, and a specific position cannot be detected within a specific time. E144 A detectio...

The waste-ink counter for the BJ F900, F890, F700, F500, S900, S820, S750 and S520 are all reset in the same manner. Turn off the printer. Press and hold the RESUME button, then press and hold the POWER button. Release the RESUME button, then press and release the RESUME button two more times in succession. (youre still holding the POWER button during this). The printer mechanics will move momentarily. You are now in Service mode. Pressing the RESUME key will select a function; for example, pressing RESUME 4 times will select the clear waste ink counter function. The lamp will alternate color with each key press. 1. service/factory test printout, including ink sensor check 2. EEPROM info printout 3. EEPROM initialization 4. Clear the waste-ink counter 5. Printer model setting. (more selections beyond this- leave this alone) After selecting mode, press the POWER button to commit the change, and return to the top of the function selection menu. Pressing the POWER button again turns off t...