Power/Units - Oki OKIPAGE 8c Plus Maintenance Manual

(3) EPROM
This EPROM (27C512-150) has a storage capacity of 512K bits and stores programs for the
PU block.
(4) EEPROM
This EEPROM (NM93C66N-NW) having a storage capacity of 4K bits is mounted on the
board by means of IC socket and stores adjustment values etc.
(5) Pulse motor drivers
These drivers (MTD2005F) drive eight pulse motors for moving up and down the EP and
transferring medium.
(6) Video memory
This SRAM receives print data through video interface and stores it.
2.3

Power/Units

The power supply unit comprises of the low voltage power supply unit which consists of an AC filter
circuit, low voltage power supply circuit and heater driver circuit, and the high voltage power supply
unit.
(1) Low voltage power supply unit
This circuit generates the following voltages.
Output voltage
+3.3 V
+5 V
+32 V
+12 V
–12 V
(2) High voltage power supply unit
This circuit generates the following voltages necessary for electro-photographic processing
from +32 V in accordance with the control sequence from the control board. When cover open
state is detected, +32 V supply is automatically interrupted to stop the supply of all the high-
voltage outputs.
Output
-1.35 KV ± 50V
CH
DB Normal paper
Y. M. C
Transparency
Y. M. C. : -200V/+300V, K. : -250V/+300V
SB Y. M. C.K : -650V/0V
TR 0 to 4 KV
FIX 0 to 2.5 KV
41057601TH Rev.1
CU Unit CPU, LED HEAD
Logic circuit supply voltage
Motor and fan drive voltage and source voltage for high-voltage supply, discharge lamp
HSP, OP Amp, high voltage power supply
HSP
Voltage
: -250V/+300V, -232V/+300V(First paper. Y only)
K : -275V/+300V
Use
Use
Voltage applied to charging roller
Voltage applied to developing roller
Voltage applied to toner supply roller
Voltage applied to transfer roller
Voltage applied to transfer roller
Remarks
Variable
Variable
17/