High-Voltage Transformer Output Control Circuit; General Description - Toshiba e-STUDIO200L Service Manual

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.
LGC board
Engine-
HVSDWN
CPU
IC22
Adjustment
value
NVRAM
HVTM
HVTAC
HVCLK
HVTT
HVTSP
ASIC
IC24
HVTGB
Digital
data
e-STUDIO200L/202L/203L/230/232/233/280/282/283
DRUM RELATED SECTION
+24VD2
IC31
HVMVR
HVAVR
D/A
HVDVR
converter
HVTVR
HVSAV
IC52
Analog data
( Reference voltage: Vc )
HVT board
Leakage detection
Main charger bias
electrode
Grid bias
Developer bias
Developer
Developer
Transfer bias
Separation bias
Transfer guide
Fig. 11-3
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11 - 4
+24VD2
Needle
Needle electrode
bias
Grid
bias
( AC )
Developer sleeve
(Magnetic roller)
bias
( DC )
Transfer charger
Separation charger
Pre/Post-Transfer guide,
bias Registration roller