Canon PC900S Manual Do Utilizador

Making Pre-Checks

Adjusting the Optimum Density

Clean the parts.

Is the copy density

 correction switch (SW101) set 

to the middle index? 

(Note 1)

Set it at 
the middle.

Select non-AE, and set the copy density 
adjusting lever to the middle index; then, 
make two to three copies of the Test 
Sheet (NA-3).

Check the following:
1.  Density of gray scale No. 9
2.  Presence/absence of difference between front 

and rear (Note 2)

3.  Density of gray scale No. 1 (good or bad; Note 2)
4.  Fogging of background (Note 2)

NO

YES

Scanning system, 
pickup/feeding system, 
delivery assembly

Check the following:
1. Cartridge
2. Scanning lamp
3. AE sensor PCB
4. DC controller PCB
5. Composite power supply PCB
 (See the appropriate troubleshooting 
procedure.)

Is the optimum 

density obtained by intensity 

adjustment? 

(Note 3)

Can the 

deviation be corrected 

using the copy density correction 

switch (SW101)? 

(Note 1)

Is gray scale No. 9 

barely visible?

END

YES

YES

YES

NO

NO

NO

Note:
1. Applies only if the machine is equipped with a copy 

density correction switch (SW101).

2. The machine is not equipped with a function to 

correct image faults. See the appropriate 
troubleshooting procedure.

3. See p. 11-42.