Sindoh M400 - Page 86

1. Channels: HVPS is composed with 4 DC-DC converters and with 7 channels of electrification (CHG), drum
(PD), development (DEV, TR, BL) and transfer (TX+, TX-)
2. Output Characteristics: Constant voltage method including transfer channels
3. Each of logic control is entered to each DC-DC converter and has PWM signals for converter control.
Categorie
s
CHG
PD
DEV
TR
BL
-TX
+TX
TX-
SENSING
Power
Voltage
∘ +24.5V ± 12.5% (+21.44V~+27.56V)
Power
Current
∘ Max. 350mA
PWM
Signal
∘ Voh 5.0V Pull-up, Vol = Max. 0.8V(at Iol = 40mA, Vcc = 4.75V)
Frequenc
y
∘ 24.41KHz ± 1KHz
Rated
Output
Voltage
-1690V
-200V
-620V
DEV-
180V
DEV-
300V
-1350V
+3000V
3.3V
Range
-250V ~ -
2000V
-
-20V ~ -
1000V
Enable
-400V ~ 3500V
-
Tolerance
±21V: -
250V ~ -
700V
±3%: -
700V ~ -
2000V
± 10V
±10V:-
20V ~ -
333V
±3%: -
333V ~-
1000V
±5%
±5%
±100V
±22V:-400V ~
600V
±100V:600V~
3500V
-
Rate Load
20MΩ ~ 1GMΩ
20MΩ ~ 1GMΩ
270MΩ ~
1GMΩ
30 MΩ ~ 1GMΩ
-
Setup
Output
Voltage
-1690V ±
21V
-200V ±
10V
-620V±
10V
± 3%
± 3%
-1350V ±
60V
At 450 MΩ
(Active
Low)
+3000V±100V
TX Output
Current
12 ± 1㎂
4. 24.5VS is supplied from LVPS. Front section of 24.5V is composed with safety interlock structure to
prevent high voltage output of HVPS when cover is opened.
5. TX channel operates when TX enable signal is entered. TX channel has 2 channels of TX+ and TX-.
6. Enable signal basically applies -1350V to TX-.
7. TX-Sensing works as to detect 12μA current constantly.
TX-Sensing signal delivers “LOW LEVEL” when transfer’s output current is lower than 12μA and “HIGH
LEVEL” when it is higher than 12μA.
8. CHG PWM : It controls CHG and PD channel voltages. PD channel always maintains 200V versus GND
using zener diode.
9. DEV PWM : It controls DEV, TR and BL channel voltages. TR and BL voltages use zener diode to always
maintain DEV-120V and DEV-300V versus DEV output voltage