Canon imagePRESS C1 Service Manual Download

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Chapter 14

14-20

Field Remedy

1. User mode > Adjustment/Cleaning > Auto Gradation Adjustment > Full Adjust > select the Test Print Paper > Test Print 1 > OK.

2. Place a printout generated in Step 1 on the copyboard glass and put about 20 sheets of identical type of paper on it to prevent it from moving when the

DADF is closed; then scan it.

Reference: The Auto Gradation Adjustment function is also available by making the following selections in user mode: [System Settings > Device

Management Settins > Auto Gradation Adjustment]. In case of making the selections above, be sure to take the action mentioned in Step2.

3. In the same manner as Step2, generate printouts of Test Print2 and 3.

Reference: In case that Full Adjustment is performed with another color model adopting the same belt type feeder, be sure to follow the procedure above.

14.3.1.7.4 Hue variation occurs in continuous copy job performed right after replacement of photosensitive drum

0016-2816

imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+

[ Case in the field ]

Description

Although there was no problem with images when performing the auto gradation adjustment (full adjustment) right after replacement of the photosensitive

drum, hue variation was confirmed between the 1st and 100th copies in making 100 copies continuously.

Cause

Since the machine was cooled completely and its photosensitive drum was fresh, the drum temperature was not setted, and thereby making variation of drum

potential large.

Field Remedy

Although depending on the outer environment and the temperature control of the drum heater before mounting a new photosensitive drum, this machine, in

some cases, needs 20 to 30 minutes to settle the temperature control of the drum heater in case it has been completely cooled in a low temperature

environment. When the same symptom occurs, perform the auto gradation adjustment in a state in which this machine is as much stable as possible and then

make copies.

14.3.1.7.5 Faulty hue (yellowish) image is output when copying pinkish original

0016-2858

imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+

[ Case in the field ]

Description

When copying (pinkish) original that was output from this machine, the output image took on a tinge of yellow. When performing a test printing with a PG

test chart (type=5, Y=35, M=35, and C=10) in use and use the output image [A] for a copy job to confirm the aforementioned symptom, the similar kind of

faulty hue image [B] was output.

F-14-25

Field Rermedy

(Workaround as of Nov. 29, 2006)

1. Change the original mode from "Test/Printed Img". to "Color Copy Original", and then make a copy again.

2. If the symptom is not improved fully in Step 1, adjust the lighter density in Special Features > Image Adjustment > Color Balance > Density Fine

Adjustment. In the field case above, hue was improved by setting the lighter density of magenta to '+3'.

14.3.1.7.6 Faulty hue image is output after executing quick auto gradation adjustment (printer PASCAL)

0016-2925

imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+

[ Inspected by Canon Inc. ]

Description

An image with faulty hue was output after executing quick adjustment (printer PASCAL) in Additional Functions > Adjustment/Cleaning > Auto Gradation

Adjustment; however, this symptom did not occur after executing the full adjustment (reader PASCAL).

Cause

In Printer PASCAL, this machine scans a patch formed in the specified distance away from the trail edge of paper. In the above-mentioned inspection case,

however, wider blank area in the trail edge prevented this machine from scanning the patch, resulting in a failure of updating the gradation correction value.

Field Remedy

1. In Service mode > COPIER > TEST > PG, set TYPE to '5' (halftone), and specify the cassette (paper) that is used for Printer PASCAL with PG-PICK;

then enter '5' for PG-QTY and perform a test copying.

2. Take measures of the width of blank area in the trail edge of each output image (5 images in total) and calculate the mean value.

3. In Service mode > COPIER > Adjust > FEED-ADJ > RESIST, adjust the trail edge blank area so that the mean value will be within 2.5mm to 3.0mm.

(adjustment range: -50 to +50, unit = 0.1mm, default='0')

Note:

- When the horizontal registration or squareness is adjusted or changed in the field, the lead edge/trail edge registration can be changed. If such is the case,

perform the field remedy mentioned above.

- If the blank area at the trail edge is small, paper might be wound around a roller in 2nd page printing/copying. If such is the case, perform an adjustment so

Canon imagePRESS C1, Service Manual

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