Ricoh B246 SERIES, Руководство пользователя, Страница: 153 / 268

153
153
LD Power Adjustment
„
The drum potential sensor output for the pattern (V
H
)
must be -300
±
20V .
z
This pattern has the same density as the ID sensor
pattern.
„
If not, the laser diode power is adjusted.
Laser
BCU
Service manual, section 6.8.11, Development Bias, Bias Grid, and LD Adjustment
ˆ
This process ensures that the ID sensor pattern is always at the same intensity, so
that the TD sensor reference voltage V
REF
updates correctly.
¾
NOTE: V
REF
is also updated regularly, using the ID sensor pattern. However,
LD power adjustment for the ID sensor pattern is not done at that time. LD
power is only adjusted during auto process control (normally at the start of the
day when the machine is switched on).
ˆ
The machine makes a pattern of the same density as the ID sensor pattern (not
fully black).
ˆ
The drum potential sensor for this pattern must be –300V
±
20V.
ˆ
If it is not, the laser diode power is adjusted. It must be adjusted successfully within
25 attempts or the laser power is set to the previous value.