Toshiba e-studio 202L - High-Voltage Transformer Output Control Circuit; General Description

e-STUDIO200L/202L/230/232/280/282 DRUM RELATED SECTION June 2004 © TOSHIBA TEC
11 - 4
11.3 High-Voltage Transformer Output Control Circuit
11.3.1 General description
The high-voltage transformer is controlled by the ON/OFF signal of each bias output from the ASIC on
the LGC board, reference voltage Vc output through D/A converter, etc. The high-voltage transformer
then generates the output current/voltage of each bias according to the +24V voltage (+24VD2) input.
Fig.11-3
HVT board
IC31
IC22
IC24
IC52
HVMVR
HVAVR
HVDVR
HVTVR
HVSAV
HVTM
HVSDWN
HVTAC
HVCLK
HVTT
HVTSP
HVTGB
NVRAM
Engine-
CPU
LGC board
ASIC
D/A
converter
Digital
data
Adjustment
value
+24VD2 +24VD2
Analog data
(
Reference voltage: Vc
)
Transfer guide
bias
Transfer bias
Separation bias
Developer bias
Main charger bias
Leakage detection
Developer
bias
(
DC
)
Developer
bias
(
AC
)
Needle electrode
Grid
Developer sleeve
(Magnetic roller)
Transfer charger
Separation charger
Pre/Post-Transfer guide,
Registration roller
Grid bias
Needle
electrode
bias