Service Call 501-584
D146/D147/D148/D149/D150 5-74 SM
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC553-00 A Fusing End Thermopile High Temperature Detection (software)
Above (T3) degrees C detected for (t4) seconds continuously.
Detection period: 100ms, detection count: 10 times or more.
§ Triac short-circuit
§ IOB defective
§ BCU defective
§ Replace the IOB
§ Replace the BCU
§ Replace the fusing unit
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC554-01 A Fusing end thermopile high temperature detection (hardware)
In the event of an error
§ Triac defective (short-circuit)
§ Engine controller defective
§ Heating edge thermopile defective
§ Fusing control software: out of control
§ If the triac is defective, replace the AC power supply board
§ If necessary, replace the BCU or heating edge thermopile
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC554-02 A Fusing end NC sensor high temperature detection (hardware)
In the event of an error
§ Triac defective (short-circuit)
§ Engine controller defective
§ Heating edge thermopile defective
§ Fusing control software: out of control
§ Attach the new fusing unit, then run SP-5-810-002
§ If necessary, replace the BCU or Fusing edge NC sensor
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