Ricoh pro c901 - RTB 117: Double feed is not detected

Technical Bulletin PAGE: 1/3
Model: Aries-P1.5/C1.5
Date: 22-Nov-16
No.: RM077117
Subject: Double feed is not detected
Prepared by: Hiroaki H Matsui
From: PP Tech Service Dept., 1st PP Tech Service Sect.
Classification:
Troubleshooting
Mechanical
Paper path
Product Safety
Part information
Electrical
Transmit/receive
Other ( )
Action required
Service manual revision
Retrofit information
Tier 2
SYMPTOM
Blank sheets are mixed in duplex jobs, because double-feed was not detected and the
double-fed sheet was not separated while passing through the PTR, fusing and switchback
units.
Note: The problem tends to occur with Thick 4 or thinner paper that tend to stick
and is less likely to occur with thick paper.
CAUSE
The emitter of the double-feed detection sensor lacks accuracy in the LED output level.
SOLUTION
The LED output level of the double-feed detection sensor was optimized, and a new
service part containing the emitter, receiver and harness was registered with
p/n: M0777405. If the problem occurs, replace with the new sensor.
Note: Make sure to replace the emitter, receiver and harness as a set.
How to replace the double-feed detection sensor
1. Open the right front door.
2. Turn the lock lever [A] of the registration unit counterclockwise and pull out the unit.