Ricoh FACSIMILE FAX77, Field Service Manual

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5-5. Defective Sensor Table
Sensor
Symptoms if shorted Symptoms if open
Document sen- “PAGES:00 KPAD/N”, “DEPTCODE 0000 “READY SET DOCUMENT” remains
sor (SB-1) KPAD/N”, or “QUICK/SPEED/KPAD” are
displayed even if a document is
displayed even if no document is present. present.
Scan line sensor At power up, the default contrast, resolu- A document jam occurs half-way
(SB-2) tion, and reception mode indicators blink. through feeding the first page.
Trailing edge Operation appears normal. Tx/copying is normal until the end.
sensor (SB-0) However, the machine does not send
an end of page signal (the other ter-
minal does not cut the paper be-
tween pages).
Printer jam sen- At power up, a paper cycle is made, then At power up, a paper cycle is made
sor (SB-5) CLEAR COPY is displayed even if there is but the paper is not cut, and CLEAR
no jam.
COPY is displayed.
Paper end sen- At power up, a paper cycle begins even if The Replace Paper indicator lights at
sor (SB-4) there is no paper, but it fails and CLEAR power up, even if paper is present
COPY is displayed.
Cutter sensor At power up, a paper cycle is made, then At power up, the cutter motor starts
(SB-7) the cutter motor rotates a few times, then immediately and rotates a few times.
CLEAR COPY is displayed.
Cover switch
CLOSE COVER is not displayed even if the CLOSE COVER is displayed even if
(SB-10) cover is opened. the cover is closed.
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