Konica Minolta bizhub c20 Service Manual page 452

Field Service Ver. 1.0 Sep. 2008
5.2 ADJUST
5.2.1 ADF 1ST SUB ZOOM
• To adjust for variations in the accuracy of all parts and their mounting accuracy by
Function varying the scanning zoom ratio in the sub-scanning direction (1-side) when using the
Automatic Document Feeder.
• When the original glass is replaced.
• When a new Auto Document Feeder Unit is mounted
Use
NOTE
• After the [CCD SUB ZOOM] adjustments have been performed
• Adjust the length of E in the copy of the test pattern so that the following specification
is met.
• 200 ± 0.5 % (Zoom Ratio = Full Size: 100 %)
Adjustment
Specification
Adjustment • -2.0% ~ "0%" ~ +2.0%
Range • Step: 0.4%
1. Print the test pattern1.
See P.216 of the main body service manual.
2. Enter the [ADJUST] menu in the service mode.
3. Select [ADF 1ST SUB ZOOM], and press the Select key.
4. Place test pattern 1 in the ADF with its printed surface up.
5. Select [TEST COPY] and press the Select key to make a test copy.
NOTE
• The test pattern1 should be positioned vertically.
Setting/
• Use A4 or Letter paper loaded into tray1 to make the test copy.
Procedure
6. Check that the width of E in the copy of the test pattern1 meets the specification.
Calculation: (1 - Width of E in the document ÷ Width of E in the copy) × 100
If the width of E is out of specification, adjust it according to the following procedure.
7. Select [ADJUST], and press the Select key.
8. Using the
9. Place the test pattern1 into the Automatic Document Feeder. Then, make a test copy
again and check it.
• If the width of E in the test pattern is longer than the specified width
Adjustment ..... Decrease the setting.
Instructions • If the width of E in the test pattern is shorter than the specified width
..... Increase the setting.
/ key, change the setting value and then press the Select key.
5. SERVICE MODE
E
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