Toshiba e-studio281c - Output Control Circuits of High-Voltage Transformer

11
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DRUM RELATED SECTION
11 - 5
11.4 Output Control Circuits of High-Voltage Transformer
• Outputs adjustment value of the main charger, transfer charger, and developer biases in the
NVRAM to the gate array.
↓
• Outputs control voltage data from the gate array to the D/A converter.
↓
• Analog conversion by the D/A converter.
↓
• Outputs control voltage Vc to the main charger grid bias, 1st transfer roller bias, 2nd transfer roller
bias, color developer bias and black developer bias transformer.
↓
• The main charger bias, 1st transfer roller bias, 2nd transfer roller bias, color developer bias and
black developer bias transformers generate output current or voltage proportional to the control volt-
age Vc with the output ON signal.
* Adjustment of the control voltage Vc (change of adjustment data) is performed in the Adjustment
Mode (05).
* Output value of the cleaning blade bias is fixed when the transformer board is shipped from the
factory.
* The output of the 1st transfer roller bias can be switched to that of the constant voltage or current
with the switching signal. (It normally switched to the output of the constant voltage in printing.)
Fig. 11-2
Engine
CPU
NVRAM
Adjustment
value
LGC board High-voltage transformer
Control voltage data
Control voltage (Vc)
Grid
1st transfer
2nd transfer
Black developer
Color developer
Main charger ON
CCON
1st transfer ON
2nd transfer ON
Black and color developer
(
DC
)
ON
Black developer
(
AC
)
ON
Color developer
(
AC
)
ON
Cleaning blade ON
D/A
converter
Gate array
#2
Gate array
#1
TC1ON
KDVVR
CDVVR
TC1VR
GVR
TC2VR
TC2ON
KCDVDON
KDVAON
CDVAON
ECON
1st transfer
constant voltage/current switch
TC1IV