Riso RP-255, Technical Manual

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AF SCANNING SECTION (RN20/21 Series)
[ 14 - 16 ]
Adjustment
1. AF Scan Start Position Adjustment
Checks and adjustment
(1) Set B4-size paper in the paper-feeding tray, place the Test Chart No. 15 on the AF unit, create an
original-size master, and print.
(2) Check the prints. Confirm that 5 ±2 mm of the top scan skip check graduations is skipped.
(3) If the position is outside the specified parameters, adjust using the Test Mode No. 186 (AF Scanning
Start Position Adjustment).
2. AF Horizontal Scan Position Adjustment
Checks and adjustment
(1) Set B4-size paper in the paper-feeding tray. Using the AF unit, create an original-size master with
the Test Chart No. 15, and then print.
(2) Examine the master created on the print drum, and check that pattern “e” on the left and right of the
original is not missing.
(3) If the pattern is missing, adjust using the Test Mode No. 185 (AF Horizontal Scan Position
Adjustment).
3. AF Image Elongation & Shrinkage Adjustment
Checks and adjustment
(1) Set B4-size paper in the paper-feeding tray, place Test Chart No. 15 on the AF unit, create an
original-size master, and then print.
(2) Lay the print on top of the original to check that the image elongation and shrinkage is within ±1.4%
at the 310-mm line.
(3) If the elongation and shrinkage is outside the specified parameters, adjust using the Test Mode No.
187 (AF Scan Image Elongation & Shrinkage Adjustment).
* Before making this adjustment, perform master image adjustment.
4. AF Read Sensor Sensitivity Adjustment
Checks and adjustment
(1) Open the AF unit, remove the two screws (P tight, M3 x 10), and then remove the AF cover. Finally,
close the AF unit.
(2) Turn variable resistor VR1 on top of the AF-PCB to adjust LED1 to maximum brightness.
Checks after adjustment
• Check that LED1 on top of the AF-PCB clears when the original (thin Riso paper inlet) is detected by
the AF read sensor.