Canon PC920 Service Manual page 275

CHAPTER 11 TROUBLESHOOTING
d. Checking the Force of the Cassette Spring
If the force of the spring used to hold up the holding plate of the cassette is not correct, pickup
faults or the like can occur.
If a fault is suspected, check the force of the spring using a spring gauge (CK-0054), and
replace the spring if it is not as indicated:
Standard: 970 ±150 g
Making Measurements
Push the spring gauge against the middle of the spring as shown, and check to make sure that
the reading of the spring gauge is 970 ±150 g when the holding plate is 18 mm away from the
bottom of the cassette.
11-10
Spring gauge
(CK-0054)
Cassette spring
Figure 11-211
COPYRIGHT © 1999 CANON INC.
Holding plate
Cassette
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)