Typical Photo Process Timing Chart - Kyocera Mita FS-6750 Service Manual

Typical photo process timing chart

The following chart shows the signals used for photo processing. These signals acti-
vate the corresponding device in the following timing sequences. A simple descrip-
tion for these signals follow.
MOTOR
PAPER
MHVDR
ERASE
BIAS
THVDR1
SPVDR
Table 4. 2 Functions of signals
Signal
MHVDR (Main High Voltage
DRive)
ERASER
BIAS
THVDR (Transfer High Voltage
DRive)
SPVDR (SeParation Vias DRive) Turns the separation charge bias on and off. The duration of
First page
A
B
F
Drives main charger with high voltage bias. This signal is kept
on during the job is processed.
Turns on the eraser (LED array) as soon as the motor begins
revolving (A above).
Turns on the developer bias (on the magnet roller). The duration
of this signal is dependent on the current paper size (B) and
turns off between pages (C).
Turns on the transfer bias. Note that the transfer bias is reverse
(+500V) at the beginning of a print job (D)until the paper is
actually fed onto the transfer roller. This prevents contamina-
tion on the back side of paper by effectively repelling the toner
during the paper is not present between the drum and the
transfer roller. The transfer bias is kept on during a print job
(E).
SPVDR turned on (F) varies depending on the size of the page.
SPVDR is off between pages (G).
4-12
Electrophotographics system
Second page
C
E
D
G
Function
Operation theory
FS-6750