Toshiba E-STUDIO520 - General Description; High-Voltage Transformer Control Circuit

e-STUDIO520/600/720/850 PROCESS RELATED SECTION March 2005 © TOSHIBA TEC
10 - 4
10.4 High-voltage Transformer Control Circuit
10.4.1 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 trans-
former generates the output current or the output voltage of each bias, based on the input +24V voltage
(+24 VG).
Fig.10-3
High-voltage transformer
HVMVR-1A
HVDVR-1A
HVTVR-1A
HVTM-0A
HVTER-0
HVDAC-0A
HVDDC-0A
HVTAC-0
HVTT-0A
HVTBB-0A
IC27
NVRAM
IC58
Main CPU
LGC board
IC56
ASIC
IC18
D/A
converter
Digital data
Adjustment
value
+24VB +24VB
Analog data
(Reference voltage: Vctr)
Transfer bias
Transfer belt cleaning bias
Developer bias
Main charger bias
Leakage detection
Developer DC
Developer AC
Main charger wire
Grid
Magnetic roller
Transfer belt
power supply roller
Transfer belt
cleaning brush
Grid bias
Main charger wire
bias