Faded Image (Low Density) - Toshiba e-STUDIO 5540C Service Manual

8.5.21

Faded image (low density)

Cause/Section Step
Laser optical 1
unit, Main
charger grid
Toner empty 2
Auto-toner
circuit
3
4
Toner motor 5
Toner cartridge 6
Developer 7
material
Developer unit 8
Main charger 9
Drum 10
11
Transfer unit 12
13
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Fig.8-30
Check item
Perform the enforced performing of
image quality closed-loop control (05-
2742).
Is the "ADD TONER" symbol
blinking?
Is there enough toner in the
cartridge?
Is the toner density of developer
material too low?
Is the toner motor malfunctioning?
Are there any abnormalities in the
toner cartridge?
Has the developer material reached
its PM life?
Is the magnetic brush in proper
contact with the drum?
Is the main charger dirty?
Is there film forming on the drum
surface?
Has the drum reached its PM life?
Is the transfer belt or the 1st transfers
roller dirty?
Is the 2nd transfer roller reached its
PM life?
When the enforced performing of
image quality closed-loop control is
performed, the automatic cleaning of
main charger and the LSU slit glass
cleaning are performed at the same
time.
Replace the toner cartridge.
Check the auto-toner circuit function.
Check the motor drive circuit.
Replace the toner cartridge.
Replace developer material.
Check the developer unit installation.
Check the doctor-sleeve gap and
pole position.
Clean it or replace the needle
electrode.
Clean or replace the drum.
Replace the drum.
Clean the transfer belt and the 1st
transfers roller.
Replace the 2nd transfer roller.
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8 - 328
Measures