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January 2000 © TOSHIBA TEC 4 - 51 FC-22 TROUBLESHOOTING
<Check by the gradation pattern>
16.While pressing [0] and [5] simultaneously, turn the power ON.
17.Input [4] with digital key and press [SETTINGS].
18.Check the output gradation images for gamma adjustment if there is any abnormality in
yellow, magenta, cyan and black.
– If there are any abnormalities –
1 Check if the drum and transfer belt are rotating. If not, correct any mechanical prob-
lems.
2 Check if the transfer belt unit is set fully upward.
3 Check if the transfer belt unit is set fully inside.
4 Check the surface of the transfer belt for any abnormal stain, large scar or tear.
5 Check if the connector of the transfer transformer is disconnected.
6 Check if the high-voltage harness of the main high-voltage transformer/transfer is
disconnected.
7 Check the harness between the LGC board and the transfer transformer if it is open-
circuited.
8 Check the high-voltage contact of the transfer belt unit if it is contacting properly or if
it is not dirty.
9 Check if the high-voltage harness is disconnected.
0 Check if the connector J113, J114 or J118 on the LGC board is disconnected.
!¡ Check if the connector J166 or J168 on the IMC board is disconnected.
!™ Check if the harness between the LGC board and the color registration sensor is
open-circuited.
!£ Check if the color registration sensor connector is disconnected.
!¢ Check if the main high-voltage transformer connector is disconnected.
!∞ Check if the harness between the LGC board and the main high-voltage transformer
is open-circuited.
!§ Replace the transfer transformer.
!¶ Replace the main high-voltage transformer.
19. Check the sensor detection area of the transfer belt for any damage, and if damaged,
replace the transfer belt.
20. Check the light receiving area of the color registration sensor if it is not dirty.
* Be sure to do the following after having made checks and corrections:
1. While pressing [0] and [8] simultaneously, turn ON the power.
2. Enter [742] with digital keys and press the [START] key.
3. Set the color registration control setting to [0] (automatic).
4. Enter [743] with digital keys and press the [START] key.
5. Set the color registration control for warming-up setting to [1] (enabled).
6. Turn OFF the power.