Ink Detection Adjustment - Ricoh JP5000 Service Manual

DRUM

6.8.7 INK DETECTION ADJUSTMENT

[A]
PURPOSE: To ensure correct detection of a no ink condition when all the ink has
been consumed.
NOTE: For this adjustment, there must be no ink on the ink roller.
PROCEDURE:
1. Remove the drum front cover [A].
2. On the ink detection board [B], connect the probes and the grounding lead of
an oscilloscope as follows:
• Probe CH1 to TP1
• Probe CH2 to TP2
• Grounding lead to TP-12V
(Select the 5 µs range.)
3. Turn on the main switch.
4. 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.
C H 1
Standard signal
C H 2
Detection signal
5. If incorrect, adjust the standard signal by turning VR901 on the ink detection
board.
C229D011.WMF
6-56
[B]
+ 0.5 µ
sec
µ sec
6
0
C229R082.WMF
1 July, 1998