Ricoh FT7770 Service Manual page 446

The sorter uses a series of 3 shift registers to turn on all clutches and
solenoids and the motor.
of the copier.
Initially, all three shift registers are reset (CN201-11, CN202-11). The
clock (CN201-2, CN202-2) then shifts the serial data (CN201-1, CN202-1)
through the shift registers. It takes 14 clock pulses to input all the data
into the registers.
When the latch signal is applied the shift registers output the data that
was serially input into them. The parallel output from the shift registers
is then buffered by drivers.
on or off.
The manual feed solenoid of the second sorter, though present, is never
actuated.
The operation is similar to the erase lamp unit
The drivers turn the individual components
10-6