Toshiba e-STUDIO2500c, Service Manual, Page: 237 / 402

11
May 2006 © TOSHIBA TEC e-STUDIO2500c/3500c/3510c PROCESS UNIT RELATED SECTION
11 - 5
11.4 Electric Circuit Description
11.4.1 High-voltage transformer control circuit
[ 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, the clock signal for generating AC bias and the reference voltage signal (VR) output
through a D/A converter. The high-voltage transformer generates the output current or voltage of each
bias, based on the input +24V voltage (+24VD3).
Fig. 11-3
High-voltage transformer
HVTMVRY/M/C/K
HVTDVRY/M/C/K
HVTTR1VRY/M/C/K
HVTMC/K
HVTSTS
HVTCLK
HVTTR2VR
HVTDDCC/K
HVTDACC/K
HVTTR1Y/M/C/K
HVTTR2
HVTECC/K
IC39
NVRAM
IC41
ASIC
IC76
D/A
converter
IC53
Engine CPU
LGC board
IC56
ASIC
D/A
converter
Digital data
Analog data
(Reference voltage)
Analog data
(Reference voltage)
Adjustment value
+24VD3 +24VD3
1st transfer bias
(Y/M/C/K)
Cleaner bias
Developer bias
(Y/M/C/K)
Main charger bias
(Y/M/C/K)
Leakage detection
Developer DC
Developer AC
Needle electrode
(Y/M/C/K)
Grid
(Y/M/C/K)
Magnetic roller
(Y/M/C/K)
1st transfer roller
(Y/M/C/K)
2nd transfer bias
2nd transfer
facing roller
Recovery blade
(Y/M/C/K)
Grid
bias
Needle electrode
bias