Ricoh FT7770 Service Manual page 563

SERVICE CALL CONDITIONS
Service Call 1 - Exposure
o The exposure lamps light while in a waiting or an idling
condition.
o The circuit of the exposure lamps opens.
Turn the main switch off and
Do the exposure lamps light?
I
Does SC 1 remain off?
Y N
I
I
I
o Replace the exposure lamp if when the exposure
lamp circuit is open.
o Replace the lamp regulator if
circuit is not open.
Press the print key.
Do the exposure lamps light?
Does
from
Y
Replace the lamp regulator.
the lamp regulator trigger
HIGH (+20 volts) to LOW?
N
I
Does the output voltage on
go from HIGH (2O volts) to
Y N
I
Replace the main board.
Check and correct the harness and/or connector.
on.
the exposure lamp
voltage (CN228-2) go
main board (CN208-A3)
LOW?
13-39
30 April, '89