Ricoh SP 8400DN Field Service Manual page 1260

6.Troubleshooting
SC No. Type
SC460- D High Voltage Power Source: Separation : Output Error
00
The machine detects the error detection signal "L (unexpected)" 10 times for 200 msec
consecutively when monitoring the error signal every 20 msec during outputting the PWM
signal.
Hardware error
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Load error
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SC No. Type
SC497-00 C
SC No. Type
SC498-00 C
522
Error Name/Error Condition/Major Cause/Solution
Input / Output connector is disconnected.
Input / Output harness is short-circuited.
Transfer unit is not set properly.
BCU error (signal error)
HVPS defective
Grounding fault of separation power output, short-circuit with other outputs
Surface/air clearance insufficient in separation power output path (including distance
from other outputs)
Cycle the main power off/on
Reconnect or replace the harness of the HVPS (power pack).
Reconnect or replace the harness between the BCU to the HVPS.
Reset or replace the transfer unit.
Check if the contact and separation movement of the transfer unit works correctly.
Replace the HVPS.
Replace the BCU.
Error Name/Error Condition/Major Cause/Solution
Machine Temperature Detection Thermistor Error
The output of the temperature sensor is out of the following range.
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0.56 V or less (90°C or more)
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3.0 V or more (-18°C or less)
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Imaging temperature sensor is not set (connector disconnected or broken)
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Imaging temperature sensor defective
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Reconnect the connector.
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Replace the connector.
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Replace the imaging temperature sensor (thermistor).
Error Name/Error Condition/Major Cause/Solution
Temperature and Humidity Sensor Error (Main machine)
The output of the temperature/humidity sensor is out of the following range.
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0.76 V or less/ 2.90 V or more (temperature sensor)