Ricoh Da-P1 Field Service Manual page 185

SC No. Level
SC547-02 D
SC No. Level
SC547-03 D
SC No. Level
SC551-00 A
Error Name/Error Condition/Major Cause/Solution
Zero-crossing error (bad relay contact)
If a "zero-crossing interrupt request" does not occur when the fusing relay
is in an ON state, an error results.
• Damaged fusing relay (open contact)
• Failed fusing relay drive circuit
• PSU fuse (24VS) blown
• Turn the main power off/on.
• Replace the PSU when fusing relay is broken.
• Check the connection between PSU – engine board.
• Replace the board and/or harness.
• Replace the PSU fuse (24VS) if it is blown
Error Name/Error Condition/Major Cause/Solution
Zero-crossing error (low frequency error)
The number of zero-crossing interrupts does not reach a certain value in
500 ms.
The frequency of the commercial power supply line is unstable.
• Turn the main power off/on.
• Check the connection of commercial power supply line
• Check the connection between PSU – engine board.
• Replace the board and/or harness
Error Name/Error Condition/Major Cause/Solution
Thermistor broken (Edge)
While a fusing heater works, temperatures of -20°C or less during a
consecutive 9 seconds are detected more than 10 times.
• Thermistor broken
• Connector contact failure
Clear the SP: fusing SC
Service Call
183