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CHAPTER 10 TROUBLESHOOTING
COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
10–18
F. Electrical System
1. Obtaining Optimum Exposure
You can adjust the intensity of the scanning lamp (LA1) at F5 as follows (effective for both
AE and manual):
1) Set the setting of ‘U12’ (density correction) in user mode to its initial value.
2) Place the Test Sheet (NA-3) on the copyboard, and select non-AE and Direct.
3) Select ‘216’ (density adjusting volume voltage display) in service mode.
4) Slide the density adjusting volume until the copy count indicator indicates ‘245’ as the F5
voltage.
5) Make a copy.
6) Check the copy image, and change the setting of ‘326’ (scanning lamp on voltage
adjustment) in service mode using the keypad.
[1] A higher setting will increase the intensity, making the image lighter.
[2] A lower setting will decrease the intensity, making the image darker.
[1]
[2]
159
Copy
density
Intensity (manual)
[1]
[2]
Test Chart
Original
density
Intensity (AE)
Copy
density
Figure 10-225
7) Press the Start key, and store the setting.
• Repeat steps 5) through 7) until an optimum image is obtained.
8) Press the Reset key to end service mode.