136 Troubleshooting
Error code 56, SET SPEED DOOR OPEN
DLCU counts the tacho pulses from the motor in order to guarantee that
the drum is stationary when the door is opened. To ensure that the signal
from the tacho generator is working correctly, DLCU compares the tacho
signal to a digital bit value from the CPU processor, which is due to the
CPU having activated the motor.
If the digital bit value is on when the door lock is unlocked, an error mes-
sage will be sent to CPU.
The DLCU processor will reset itself when the error has disappeared.
CPU reads the error message when the program finishes and generates an
error code, the error message is ignored between these two occasions.
Reason:
The error can be caused by cross talk in circuits in the CPU, or caused by
damaged components in the CPU.
Action:
If the error returns after a reset, change the CPU.
Error code 58, SET SIGNAL NO TACHO
DLCU counts the tacho pulses from the motor in order to guarantee that
the drum is stationary when the door is opened. To ensure that the signal
from the tacho generator is working correctly, DLCU compares the tacho
signal to a digital bit value from the CPU processor, which is due to the
CPU having activated the motor. The tacho signal should always cor-
respond to the digital bit value and if the tacho signal is not present when
the digital bit value is present, an error message will be generated to CPU.
The error message is filtered in such a way that the digital bit value should
have been on for 2 seconds; if this is the case, a check is made that the
pulses from the tacho sensor are present when the digital bit value ceases.
The DLCU processor will reset itself when the error has disappeared.
CPU reads the error message when the program finishes and generates an
error code, the error message is ignored between these two occasions.
Reason:
• Theerrorcanbecausedbybreaksinthecircuitsforthetachosensor,
or caused by a error in the magnet in the tacho sensor.
• Collateraldamageduetoaerrorinthemotorsystem.
Action:
• Ifthereisnoerrorinthetachosensororthemotorsystem,andtheer-
ror returns after a reset, change the CPU.