Canon PC980 Service Manual - Page 308

CHAPTER 11 TROUBLESHOOTING 3. AE Adjustment Perform this adjustment if you have replaced any of the following: • DC controller PCB • Composite power supply PCB (See p.11-41.) • AE sensor PCB • Scanning lamp Making Adjustments Before Starting the Work • Obtain a newspaper with more or less even print. (Avoid ones with many photos or large display text.) • Obtain five sheets of white sheets of paper. • Be sure that the intensity of the scanning lamp has been adjusted when you have replaced the scanning lamp. • Set the density correction switch (SW101) to the middle setting. If the machine is not equipped with a density correction switch, set the density adjusting lever to the middle setting. 1) Short JP103 and JP104 on the DC controller PCB. SERVICE JP104 JP103 Figure 11-265 2) While keeping the condition in step 1), turn on the power. • The scanning lamp will turn on, and the main motor (M1) will rotate. 3) Stop shorting JP103 and JP104. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-43