Fig. 431 Corona Wire Loop; Fig. 4-32 Attaching Corona Wire - Canon NP-70 Service Manual

NP•70
4-27
3) CORONA WIRE REPLACEMENT
Although each corona assembly differs in corona wire specifications. the follmwing general pro-
cedure is applicable for wire replacement.
a) Cut a length of wire and form a loop at each end.
The overall length of the wire should be equal to
the dimensions given in Table 4-l. b
2~
(1) (2)
(3)
Fig. 431 Corona Wire Loop
b) Remove the covers from the termination housings and take out the old wire.
c) With the exception of the A. C. Corona Assembly,
both ends of the corona wire should be attached
to the tension spring which connects the corona
wire with the rear assembly terminal. In the case
of the A. C. Corona Assembly, only one loop is
connected.
Corona Wire
Fig. 4-32 Attaching Corona Wire
d) Position the other end of the wire (not connected to the spring) on its mounting stud in
the front termination cover.
e) Pass the wire (s) over the seating position (s) of the wire guides and secure the spring to
the rear teminal, using tweezers.
f) Set the corona wire height to that prescribed in Table 4 - 1.
4)
GRID WIRE REPLACEMENT
Perform grid wire replacement whenever it becomes damaged or uncleanable (reference-
Fig. 4-33).
a) Remove the grid portion of the A. C. Corona Assembly.
b) Loosen the front grid wire hanger and remove the old grid. Then, tighten the front
hanger at its inward position.
© CANON INC.
Second Printing-June, 1974