Ricoh LDD250, Руководство по обслуживанию

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DRUM SECTION
SM 3-71 C262/C265
R
ep
lac
em
en
t
Adjus
tm
ent
Ink Detection Adjustment
Purpose: To ensure correct detection of a no-ink condition when all the ink has
been consumed.
CAUTION: Before you do this procedure, be sure to remove the ink around the ink
roller. To do this, set SP2-2-1 (ink detection) to OFF, and then feed
paper until the ink reaches the end condition. After you complete the
following procedure, make sure to return SP2-2-1 to its default (ink
detection ON).
1. Remove the drum front cover [A].
2. Connect the probes and grounding lead of
an oscilloscope to the following points on
the ink detection board [B]:
•
Probe CH1 to TP1
•
Probe CH2 to TP2
•
Grounding lead to TP3 and TP4
3. Select the 5
μ
s range.
4. Turn ON the main switch.
5. Make sure that the waveform is as shown
in the top half of the following diagram
when the ink detection pin is not in contact
with the ink.
6. If incorrect, adjust the standard signal by turning VR901 [C] on the ink detection
board.
C262R071.WMF
6
+
0.5
μ
0
CH1
Standard signal
CH2
Detection signal
μ sec
sec
C262R072.WMF
[A]
[B]
[C]
⇒
Rev. 05/2006