Ricoh D014 Service Manual page 916

Copy Process Overview
ID Sensors, Music Sensors
An ID sensor and three MUSIC sensors [13] are mounted over the surface of the image
transfer belt. The laser in each PCU writes an ID sensor pattern on each drum surface (Y,
M, C, K) at prescribed intervals then these patterns are transferred to the image transfer
belt. The ID sensor above the patterns on the ITB measures the light reflected from each of
the four patterns and sends this data (Vsp) to the CPU. These Vsp readings are used for
toner supply control. The MUSIC sensors read a different set of patterns. These readings
are used to 1) adjust the start timing for laser firing, 2) adjust the angle of the 3rd mirror,
and 3) set the drum rotation speeds. The MUSIC sensor readings are used to ensure that
the alignment of the images on the ITB is always correct.
Paper Transfer and Separation
A strong negative charge applied to the PTR idle roller [14] repels and pushes the image
from the image transfer belt onto the paper. Immediately after this is done, a paper
discharge plate neutralizes the charge on the paper and image transfer belt. The curvature
of the feed path makes the paper to separate from the image transfer belt.
D014/D015/D078/D079
CÓPIA NÃO CONTROLADA
6-12
CÓPIA NÃO CONTROLADA
SM