JUNE 2002 © TOSHIBA TEC
5 - 109
e-STUDIO550/650/810 TROUBLESHOOTING
Defective area
Step
Check Items
Prescription
Remarks
Main charger output
8
Is the setting value proper?
If the setting value is out of specification,
Is the main charger output normal?
adjust it.
If the output is not normal, check the
circuits. (Note 1)
Developer bias output
9
Is the setting value proper?
If the setting value is out of specification,
Is the developer bias output normal?
adjust it.
If the output is not normal, check the
circuits. (Note 1)
Increasing toner density
10 Is the performance of the auto-toner
Check the performance of the
sensor control normal?
auto-toner sensor.
11 Is the toner density high?
Adjust the toner density.
(Note 2: See the toner density
correcting method.)
Image quality sensor/
12 Are the image quality sensor and the
Check the performance of the image
Surface potential sensor
surface potential sensor normal?
quality sensor and the surface potential
sensor. (See the troubleshooting
related with the image quality control.)
Drum cleaning blade
13 Is the drum cleaned properly?
See the troubleshooting for the
poor cleaning.)
Note 1:
If the output from the main charger or the developer bias is abnormal, replace the high-voltage transformer with a new one and
output the chart again. If the output stays abnormal, check if the harness connecting the LGC board and high-voltage
transformer is open-circuited, if the power supply is normal and if the main charger wire is dirty.
Note 2:
Toner density correcting method
Change the setting value ‘Toner density life correction setting (08-414)’ (6 is the default setting.)
3: Appox. 1.5% lower than the current value
7: Appox. 0.3% higher than the current value
4: Appox. 0.8% lower than the current value
0: Appox. 0.5% higher than the current value
5: Appox. 0.3% lower than the current value
1: Appox. 0.8% higher than the current value
6: The current value (Default setting)
2: Appox. 1.5% higher than the current value
<Caution for correction>
When increasing or decreasing the toner density too much, the image may become poor or the life of developer material,
cleaner, photoconductive drum and fuser unit, etc. may shorten. Therefore it is not recommended to correct (to shift) the toner
density basically. If it is shifted, make sure that the image may be improper in a few minutes after shifting.
Содержание e-studio550
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