Table 4-3 Spring Specifications - Canon NP-70 Service Manual

4-52
NP-70
2) PAPER SEPARATION BRACKETS
These brackets have a formed finger, known as the separation hook, for holding the front edge
of the top sheet of paper for proper feeding into the copier.
3) PAPER CONTACT PLATES
These plates have a foam pad attached and are positioned along the sides of the paper. The
pads grip the paper slightly and minimize the possibility of more than one sheet of paper being
fed at one time.
4) CASSETTE COVER
The cassette cover has two sections, one of which is swung back when inserting the cassette
into the copier. This cover should be opened when used for copying and closed when in
storage.
5) SPRINGS
These springs lift the paper by means of the inner plate. Table 4-3 shows the specifications
of springs used for each magazine. When replacing springs, change both together.
Cassette Part No. Number of coils
Diameter of wire
(mm)
Total length
(mm)
A3 97-5922
10.0 1.2 71.5
B4
97-5923 11.0 1.2 75
A4 97-5924 10.0 1.0
79
BS 97-5925 10.5 1.0
84.5
Letter 97-5924 10.0 1.0 79
Universal 97-5924 10.0
1.0 79
Table 4-3 Spring Specifications
4.9-3
REMOVAL/INSTALLATION ACTIONS
The Cassette Assemblies are designed for easy slip-in/slip-out use. However, whenever replac-
ing, be sure that the cassette is firmly positioned in the machine. Without proper seating, the
NP-70 will not operate.
4.9-4 REPAIR/SERVICING ACTIONS
The accurate positioning and action of components in the cassette is important to the opera-
tion of the NP-70 copier. Should a cassette fail to operate properly the follow may be per-
formed:
1) SPRING PRESSURE CHECK
Stand a ruler vertically against the front edge of the inner plate and lower the paper lifting
plate with a manometer pressing on the front-center. Measure the pressure when the front
edge of the plate is depressed 3 mm and 32 mm. The specified values are listed in Table 4-4.
Second Printing,lune, 1974
© CANON INC.