Ricoh FT4227 Manual page 579

COPY QUALITY
Yes
Does the drum rotate properly?
Yes No
Check drum drive mechanisms such as the drum drive belt and the drum
pulleys.
Check the following points:
CN103-4 (Charge/grid trigger line)
•
(1) If the signal stays HIGH after the Start key is pressed, replace the
main control board.
(2) If the charge corona does not turn on even if the signal changes to
LOW, replace the high voltage supply board - CTBG.
• CN103-2 (Transfer trigger line)
(1) If the signal stays HIGH after the Start key is pressed, replace the
main control board.
(2) If the transfer corona does not turn on even if the signal changes to
LOW, replace the high voltage supply board - CTBG.
If there is no problem with the signal lines, replace the drum if the sensitivity
does not recover even when the drum is not exposed to light.
6-4
12 February 1992