Self Diagnosis (Pdl Board - Canon C2050 Service Handbook

5 Self Diagnosis (PDL Board)

E677
Main cause The connection between the host machine and the PDL board is faulty. The
system software is faulty. The hard disk is faulty. The PDL board is faulty.
The system controller PCB of the host machine is faulty.
Condition of
detection
0001 DPRAM size error
0002 Initialization communication error
0004 PDL board disconnection
0080 Communication error
In communication for initialization, the DPRAM size returned by
the PDL board to the host machine has an error.
(The host machine is aware of the DPRAM size in advance; the
DPRAM is a dual-port RAM used for communication between the
host machine and the PDL board, and is mounted on the PDL
board.)
In communication for initialization, the contents of communication
returned by the PDL board to the host machine have an error and,
therefore, communication cannot be established.
After the connection of the PDL board is recognized at power-on,
the PDL board is disconnected.
During power-up, monitoring is executed at intervals of 2 min;
however, if the CPU is not on (sleep state or the like), no error will
be identified even if the PDL board is discontented.
If the PDL board is disconnected in sleep state, the absence of the
PDL board will be recognized at the start of the CPU.
An error in communication has occurred after the communication
between the host machine and the PDL board has been established.
For communication related to the sleep mode (power control) of
the host machine, the response from the PDL board is disrupted for
2 min or more.
ERROR CODE
E-25