Ricoh SP 8400DN Field Service Manual page 1282

6.Troubleshooting
SC No. Type
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SC547- D Zero cross Error (relay contact fault)
02
In the event of an error
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SC547- D Zero cross Error (low-frequency error)
03
In the event of an error
Frequency instability of commercial power line
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SC No. Type
SC551- A Fusing Thermopile (Edge) Disconnection
01
When the thermopile (edge) detects a predetermined temperature or less for specified
seconds consecutively.
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SC551- A NC Sensor (End) Disconnection
02
3ED - 3FF (FB voltage: 3.243V-3.300V) is detected for specified seconds continuously (NC
sensor (center): detection & compensation, NC sensor (end): detection & compensation).
Detection period: 100 ms, detection frequency: 10 times or more.
•
544
Error Name/Error Condition/Major Cause/Solution
Turn the main power supply switch OFF/ON
If the fusing relay is damaged, replace the PSU.
Check the connection between PSU and controller board, and replace harness and
board if necessary.
Fusing relay damage (contact open)
Fusing relay drive circuit fault
PSU fuse (24VS) blowout
Turn the main power supply switch OFF/ON.
If the fusing relay is damaged, replace the PSU.
Check the connection between PSU and controller board, and replace harness and
board if necessary.
If the PSU fuse (24VS) blows out, replace the fuse.
Turn the main power supply switch OFF/ON.
Check the power source.
Check the connection between PSU and controller board, and replace harness and
board if necessary.
Error Name/Error Condition/Major Cause/Solution
Harness broken
Connector disconnected
Reconnect the connectors between the fusing unit and the BCU.
Replace the thermopile (edge).
Replace the harness between the fusing unit and the BCU.
Replace the BCU.
Harness broken