CHAPTER 4 IMAGE FORMATION SYSTEM

Input Signals from the DC Controller to the Composite Power Supply PCB

 

 

Half preheating

Full preheating

Fluorescent lamp

Fluorescent lamp

 

 

 

 

ON I*

ON II*

 

 

 

 

 

 

Duty ratio (5 kHz)

 

25.9 %

60 %

44.4 %

55 %

 

 

 

 

 

 

Filament voltage

 

2.5Vrms

4.5Vrms

3.6Vrms

4.1Vrms

 

 

 

 

 

*ON duty ratio of FLOW signal (in relation to 1kHz):

 

 

40% or more

ON I

 

 

less than 40%

..............................

ON II

 

 

Table 4-101

Half Pre-Heating Control (between press on Power switch and press on Copy Start key; part of scanner reverse travel)

OFF

FLON signal

5KHz

25.9%

FLPRHT signal

Figure 4-106

5V

0V

Full Pre-Heating Control (initial rotation, last rotation, part of scanner reverse travel)

OFF

FLON signal

5KHz

60%

FLPRHT signal

Figure 4-107

5V

0V

4-6

COPYRIGHT © 1997 CANON INC.

CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

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Canon NP6218, FY8-13EX-000 service manual Off