Technical Bulletin PAGE: 1/2
Model: Taurus-C1/P1 (D074/D075/M044) Date: 13-Feb-12 No.: RD074044
D
Subject: Troubleshooting Vertical Dark Lines Prepared by: S. Sasaki
From: 1st PP Tech Service Sec., PP Tech Service Dept.,
Classification: Troubleshooting
Mechanical
Paper path
Part information
Electrical
Transmit/receive
Action required
Service manual revision
Retrofit information
Product Safety Other ( ) Tier 2
Symptom
Vertical dark lines [A] appear on the output when printing solid images in single color mode.
Cause
A foreign substance stuck in the doctor gap of the development unit causes inconsistency
in developer supply.
Action
Clean the doctor gap of the affected development unit, using the following procedure.
1. Print 3 each of full dot pattern (SP2-109-003: "26") and 1-dot halftone pattern (SP2-109-
003: "11") on either A3 or DLT in black, cyan, magenta, and green.
To make a full-green coverage page
z Enter SP2-109-003 and select No.26 (Full Dot Pattern).
z Enter SP2-109-005 and select "1" (Full Color).
z Enter SP2-109-6 and change Density K from "15" to "0".
z Enter SP2-109-8 and change Density M from "15" to "0".
z Enter SP2-109-7 and -9 and make sure that Density C and Density Y are both
set to "15" (default settings).
Dark lines appear along the feed direction.
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