4-5. SBU REPLACEMENT AND SCANNER/SENSOR ADJUSTMENT
4-5-1. SBU Adjustment Tools
1. Adjustment Kit
(P/No. H0809600)
2. Test PCB
(P/No. H0939650)
Additionally, the test chart which is included in the adjustment kit is available as part number H0809602.
4-5-2. SBU Replacement
1. Unplug the machine from the wall outlet.
2. Remove the printer cover, operation panel assembly, and scanner cover (see sections 2-1 and 2-3).
3. Remove the SBU (2 screws, 1 connector at CN7 on the FDU).
4-5-3. Scanner/Sensor Adjustment
Every time you replace the SBU or when the machine has a document non-feed or jam problem because of incor-
rect scanner/sensor adjustment, adjust the scanner/sensor mechanism as shown in the following pages.
As the scanner has 2 features, scanning document and detecting sensor actuator movement, the scanner needs ex-
act adjustment. Refer to Appendix D for more details on the scanner/sensor mechanism.
This section is divided into 4 parts:
1. Preparation
2. Horizontal Scan Line Adjustment
3. Vertical Scan Line Adjustment
4. Focusing
‘‘Preparation’’
explains how to set up the SBU adjustment tools in the machine.
‘‘Horizontal Scan Line Adjustment ’’
explains how to adjust the horizontal position of the SBU with the tools.
This section is quite important because the machine cannot detect sensor movement unless the SBU is adjusted
properly.
‘‘Vertical Scan Line Adjustment ’’
explains how to adjust the vertical position of the SBU with the tools.
The new test chart is designed so that the SBU can be adjusted vertically.
‘‘Focusing’’
explains how to adjust focusing on the CCD. Adjusting the lens position is a bit more difficult than for
other current models.
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