High-Voltage Transformer Control Circuit; General Description - Toshiba e-STUDIO555 Service Manual

9.4

High-voltage Transformer Control Circuit

9.4.1

General description

The high-voltage transformer is controlled by the on-off signal of each bias output from the ASIC on the
LGC board, and the reference voltage (Vctr) output through a D/A converter. The high-voltage
transformer generates the output current or the output voltage of each bias, based on the input +24V
voltage (+24VD1).
LGC board
IC58
Main CPU
Adjustment
value
HVTER-0
HVTM-0
HVDAC-0
HVTAC-0
HVDDC-0
IC56
HVTT-0
ASIC
HVTBB-0
Digital data
e-STUDIO555/655/755/855
PROCESS RELATED SECTION
+24VD1
IC27
NVRAM
IC31
Buffer
HVMVR-1A
IC18
HVDVR-1A
D/A
HVTVR-1A
converter
Analog data
(Reference voltage: Vctr)
High-voltage transformer
Leakage detection
Main charger bias
Main charger wire
bias
Grid bias
Developer bias
Developer AC
Developer DC
Transfer bias
Transfer belt cleaning bias
Fig. 9-3
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9 - 4
+24VD1
Main charger wire
Grid
Magnetic roller
Transfer belt
power supply roller
Transfer belt
cleaning brush