Ricoh D131 Service Manual page 543

SC800: Overall System
Could not initialize or read the bus connection.
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[50B1]
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SSCG register value was incorrect.
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[50B2]
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SC834 D Self-diagnostic error: optional memory
An error occurred after write/verify check for optional RAM on the
motherboard..
[5101]
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
SC838 D Self-diagnostic error: Clock generator
A verify error occurred when setting data was read from the clock
generator via the I2C bus
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[2701]
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D131/D132/D133
Defective connection bus
Defective SSCG
Replace the motherboard (engine I/F board).
Defective connection bus
Defective SSCG
Replace the motherboard (engine I/F board).
Defective memory device
Replace the motherboard (engine I/F board).
Defective clock generator
Defective I2C bus
Defective I2C port on the CPU
Replace the controller board.
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GW
SM Appendix