Toshiba e-STUDIO556 Service Manual page 785

NO 
l
l
l
l
l
l
l
l
l
l
l
l

YES
Check the value for 05-2165 and 05-2166. Is the value which is subtracted the value for 05-
2165 from the one for 05-2166 "400" or more?
NO 
l
l
l
l
l
l
l
l
l

YES
Replace the LGC board and perform the drum surface potential sensor control / condition
check (described later).
<<Procedure of the "surface potential sensor control check">>
1. Set the value for the number of detected abnormalities of the drum surface potential
control (08-2850) to "0".
2. Set the value for the drum surface potential setting (08-2851) to "0" (valid).
3. Perform the "enforced performing of image quality control" (05-2120).
4. Check the status of drum surface potential sensor control (05-2160) and number of drum
surface potential sensor control abnormality (08-2850).
Are both values for 05-2160 and 08-2850 "0"?
Perform the test print (04-114: Secondary scanning direction 33 gradation steps). Is there
any problem with the image?
YES 

NO
© 2011 - 2014 TOSHIBA TEC CORPORATION All rights reserved
1. Perform the charging transformer output (05-2040) and check that
the value is within the range of -500±12V. If the voltage is outside the
range, replace the HVT board and perform the drum surface
potential sensor control / condition check (described later).
2. When the charging transformer output is within the range of -
500±12V, replace the drum surface potential sensor, and perform the
drum surface potential sensor control / condition check (described
later).
3. If the problem still occurs, replace the LGC board, and perform the
drum surface potential sensor control/condition check (described
later).
1. Replace the HVT board, and perform the drum surface potential
sensor control / condition check (described later).
2. Replace the photoconductive drum, and perform the drum surface
potential sensor control / condition check (described later).
3. Replace the surface potential sensor, and perform the drum surface
potential sensor control / condition check (described later).
4. If the problem still occurs, replace the LGC board, and perform the
drum surface potential sensor control / condition check (described
later).
End
8 - 233
e-STUDIO556/656/756/856/557/657/757/857
ERROR CODE AND TROUBLESHOOTING
8