Ricoh C231 Service Manual page 90

ERROR DETECTION
Feed Start
Timing Sensor
2 n d F e e d
Timing Sensor
Paper Exit
Timing Sensor
Registration
S e n s o r
Exit Sensor
a) When the CPU counts a certain number of main motor encoder pulses
(N) after the feed start timing sensor is actuated, if the registration sensor
does not detect the paper, the jam indicator lights.
b) When the paper exit timing sensor is actuated, if the exit sensor remains
activated, the jam indicator lights.
c) When a certain time (t) (this time depends on the drum speed) has
passed after the paper exit timing sensor is actuated, if the exit sensor is
not activated, the machine detects a paper jam. If this jam condition is
detected, the CPU will stop the next paper from being fed. When the 2nd
feed timing sensor is actuated:
1. If the registration sensor is activated, a registration failure is
detected.
2. If the registration sensor is not activated, a paper wrap jam is
detected.
C231
N
t
a ) O N C h e c k c) Feed or Wrapping Jam
b ) O F F C h e c k
c) ON Check
2-50
C231D570.WMF
SM