Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 362 / 987

CAUTION:
• Since Sublogs are basically stored in volatile memory, almost all information will be lost by turning OFF and then ON
the power. Therefore, it is important to perform log collection operation without turning OFF and then ON the power
while the symptom occurs.
• Once the Sublog files are collected, they are deleted from the host machine. In the case of collecting Sublogs
consecutively, the number of continuous log files may be fewer than usual.
■ Key Operation Logs
The key operation log function is used to collect user's key operation logs in order to distinguish between a host machine failure
and a user's operation mistake when, for example, a fax transmission error occurred.
If it cannot be denied the possibility that the user operation caused the error, collect the key operation logs.
Key operation logs are not recorded by default, therefore, the function needs to be enabled.
In order to save key operation logs, configure the setting of the following Settings/Registration menu to ON (enabled).
[Management Settings] > [Device Management] > [Store Key Operation Log]
Only when the foregoing setting is enabled, it is judged that user's permission has been obtained, and user operation logs start
to be recorded.
User operation logs are saved together with Sublogs and collected as logs contained in Sublog files.
Among the saved user operation logs, the confidential information shown below is masked.
• Password entered from the software keyboard
• PIN, PIN code, etc. entered from the Numeric Keypad
• Information that is hidden by turned letters on the UI screen
CAUTION:
Be sure to obtain user's permission in advance to record key operation logs for analyzing problems.
NOTE:
• When logs are output, passwords, PIN, and turned letters are masked, and these confidential information never leak out.
• Collect this log when it is determined that analysis of the firmware debug log is required.
■ Network Packet Logs
With this function, network packet data sent from or received by the host machine is collected (captured) in the HDD without the
need for special equipment.
When it is expected that the trouble was caused by network, collect network packet logs.
Note that this function is not a standard function because packet data on the network contains customer information. To use this
function, it needs to be activated as a license option and then enabled in service mode.
CAUTION:
When collecting network packet logs using this function, be sure to obtain user's permission in advance by explaining about
it.
CAUTION:
In the case of a heavy-load network environment, some of the packets may be left uncollected.
6. Troubleshooting
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