Filter
Top Products
FC-210/310 TROUBLESHOOTING 4 - 60 February 2002 © TOSHIBA TEC
<Check by the grid pattern>
13.While pressing [0] and [5] simultaneously, turn the power ON.
14.Enter "1" with digital key and press the [PRINTER/NETWORK] key.
15.Check the output grid patterns of yellow, magenta, cyan and black if there is image density
difference among the front/center/rear areas or abnormality in the overall image.
* At this time, there is no problem even if the Y, M, C and K grid patterns are out of alignment.
– If there is difference in tonal balance between the front and rear areas –
• Check the state of contact of the photoconductive drum and the transfer belt.
• Check the quantity of developer (check whether developer material is properly sup-
plied onto the surface of the developer sleeve).
– If there is any streak of yellow, magenta, cyan or black streak in the secondary-scanning
direction –
• Check if there is any stain or dust on the main charger wire that corresponds to the
color of the streak.
– If there is any white streak in the secondary-scanning direction –
• Check if there is any stain or dust on the slit glass of the laser optical unit.
– If the entire page is solid in a specific color –
• Abnormality of the main high-voltage transformer corresponding to that color or
abnormalityof the laser optical unit.
Of the four main high-voltage transformers, exchange the main high-voltage trans-
former considered to be abnormal for other main high-voltage transformer considered
to be normal, and then output the chart again.
If the solid color over the entire page changes as the result of exchanging the main
high-voltage transformer, that main high-voltage transformer is abnormal.
If the solid color over the entire page does not change, check whether there is any
disconnection of the harness between the LGC board and the main high-voltage
transformer or whether the power supplys to the main charger (disconnection of high-
voltage harness or contact defects). If there is no problem, check the laser optical
unit.
If the density is low on both front and rear sides and any of the above abnormalities are not found,
make the following check.