Ricoh FT556 Service Manual page 154

6. Check the lamp voltage as follows:
a) Turn the main switch off.
b) Turn on DIP SW 201-8 on the left side
of the operation panel.
c) Turn on the main switch.
d) Press 5, 1, and # in that order.
e) Check the lamp voltage, displayed in
the Magnification Ratio indicator, at ID
level 4.
• The lamp voltage at ID level 4 should
not be more than 79 volts. If it is more
than 79 volts, replace the exposure
lamp.
7. Adjust VR1 [A] on the operation panel
board to achieve proper image density.
(Turn clockwise to increase [H] or counter-
clockwise to decrease [L].)
8. Turn off the main switch.
9. Turn off DIP SW 201-8, and reassemble.