Ricoh DD5450 Field Service Manual page 116

Chapter 3 Master Making/Master Feed/Ejection Section
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1. Master Setting Error Detection
Operation
During master making, the master top sensor uses amount of reflected light to detect presence
or absence of a master on the transfer path. Then the following displays and operations are
performed:
● When a master setting error is detected, "MASTER SET ERROR" is displayed and printing is
not processed.
● "MASTER SET ERROR" is only cleared by opening and closing the master cover.
(It is not cleared by turning the power off.)
● Printing is not performed but master making is only performed when the display is cleared after
"MASTER SET ERROR" is displayed.
(Because the master is not attached to the drum.)
Timing
Master setting error is detected in the following conditions.
● While master making is being processed, the reflected light amount does not turn to be in a white
level. (Master detection sensor)
● When completing master making, reflected light amount received by the master top sensor is at
the white level (master present).
2. Master End Detection
Operation
The end mark is printed on the area about 1 m from the end of the master.
● When the end mark is detected, "NO MASTER" is displayed.
● When "NO MASTER" is displayed, master making is not performed next. (The display is not
cleared by turning the power off.)
Timing
When the end mark sensor continuously detects end mark (HELP-008, indicated value: 100 or more)
during master making, it is considered as master end and "NO MASTER" is displayed.
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