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SUBJECT:
SC321 USING FIERY & MISFEEDS FROM BYPASS
SYMPTOM:
1. Intermittent SC321 codes only when in Printer Mode (using Fiery).
2. Paper is misfed from bypass table with A3 paper, ACS mode, and second side of duplex copy.
CAUSE:
1. Electrical noise interfering with the Transfer Belt start signal.
2. The paper buckle at the Registration Rollers becomes smaller due to the stiffness of paper. During this
period, the copy paper fed from the bypass table waits to start. This means that if stiff paper waits longer
at the Registration Rollers, the buckle will become smaller.
The problem occurs only with the ACS mode, bypass feed, A3 paper and second side of duplex copy, for
the following reasons:
1. ACS mode and bypass feed
In the ACS mode, copy paper starts to be fed toward the Registration Rollers when the development
process starts. This is because the paper from the bypass table must meet the earlier registration
start timing of black and white copy. The waiting time for paper at registration for a full color copy is
longer than that for a black and white copy.
2. Paper
The development time with A3 paper is longer than with A4 paper side ways.
This means that the waiting time for A3 paper is longer than that of A4 paper.
3. Second Side of Duplex Copy
When the second side is copied, the paper has already passed the fusing section. The paper with
silicone oil from the fusing section makes the friction between the feed and reverse roller less. This
means that the paper slips between the two rollers easier than the paper without silicone oil.
SOLUTION:
1. Improved software timing tolerance to avoid electrical interference.
2. The software has been changed as shown in the diagrams below. These changes ensure that paper is
fed through the Registration Rollers even if the paper buckle is small.
RICOH GROUP COMPANIES
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CONTROL NO. 297
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