Toshiba 4511, 3511

e-STUDIO3511/4511 TROUBLESHOOTING 5 - 110 November 2003 © TOSHIBA TEC

Remarks

See step 6 if

defects occur.

Cause/Section

Density reproduction

Printer section

Scanner

Parameter

adjustment value

Cover

Auto-toner

Main charger output

Developer bias

Developer unit

Developer material/

Toner/Drum

Drum cleaning blade

Transfer belt cleaning

blade

Toner dusting

Step

Check items

Check the gradation reproduction.

Check the printer output image.

Check if the original glass,

mirrors or lens is dirty.

Check the image processing

parameters.

Adjust the image processing

parameters.

Is the cover installed properly?

(Is the drum exposed to the

external light?)

Is the auto-toner sensor normal?

Is the toner supply operating

constantly?

Is the main charger output

normal?

Is the developer bias proper?

Is the contact between the drum

and developer material proper?

Using the specified developer

material, toner and drum?

Have the developer material and

drum reached their PM life?

Is the storage environment of the

toner cartridge 35oC or less

without dew?

Is the drum cleaned properly?

Is the transfer belt cleaning blade

contacted and released properly?

Is the transfer belt cleaning blade

in proper contact with the transfer

belt?

Is the toner accumulated on the

seals of the developer unit?

Measures

Perform the forced performing of

image quality closed-loop control

(05-395) and then automatic

gamma adjustment.

Output the test patterns and

check them.

Color:using 04-231 for each

color

Black:using 04-113

Clean it.

Check the value of offsetting

adjustment for background

processing (color) and back-

ground peak adjustment for

range correction (black).

While checking the above

encircled image, adjust the

reproduction level by the offset-

ting adjustment for background

processing (color) and back-

ground peak adjustment for

range correction (black).

Correct it.

Check the operation of auto-

toner sensor and readjust.

Check the motor and circuits.

Check the circuits.

Check the doctor-to-sleeve gap

and pole position.

Use the specified developer

material, toner and drum.

Replace the developer material

and drum.

Use the toner cartridge stored in

the environment within specifica-

tion.

Check the drum cleaning blade

pressure.

Check if the spring of the transfer

belt cleaner clutch is removed or

if any connector is disconnected.

Otherwise replace the clutch.

Check if the blade pressure

spring is installed.

Remove the toner and clean the

seals.

* If the trouble is not solved at the step 1 and the step 2 or followings (excluding the parameter adjustment) are

performed, make sure to perform “Enforced performing of image quality closed-loop control” and then “Automatic

gamma adjustment” after taking a measure.