Ricoh SP 8400DN Field Service Manual page 1277

SC No. Type
SC541- A Fusing Thermopile (Center) Disconnection
01
Below a predetermined temperature (or below CB) is detected for specified seconds
continuously.
Detection frequency: 10 times or more.
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SC541- A NC Sensor (Center) 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.
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SC541- A NC Sensor (Center) Short-circuit
03
AD value: 0-13 (FB voltage: 0.000V-0.041V) is detected for specified seconds continuously.
Detection period: 100 ms, detection frequency: 10 times or more.
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SC No. Type
SC542- A Fusing Thermopile (Center) Thermopile Does Not Reload
02
When the thermopile (center) does not reach a predetermined temperature for 7 seconds
consecutively.
SC542- A Fusing Thermopile (Center) Does Not Reload
03
When the thermopile (center) does not reach the permission temperature of heat central
reloading for specified seconds continuously.
Error Name/Error Condition/Major Cause/Solution
Harness broken
Connector disconnected
Reconnect the connectors between the fusing unit and the BCU.
Replace the thermopile (center).
Replace the harness between the fusing unit and the BCU.
Replace the BCU.
Harness broken
Connector disconnected
Reconnect the connectors between the fusing unit and the BCU.
Replace the NC sensor (center).
Replace the harness between the fusing unit and the BCU.
Replace the BCU.
Harness broken
Connector disconnected
Reconnect the connectors between the fusing unit and the BCU.
Replace the NC sensor (center).
Replace the harness between the fusing unit and the BCU.
Replace the BCU.
Error Name/Error Condition/Major Cause/Solution
6.Troubleshooting
539