2GL/2FV/2FW
2-3-6
2-3-3 Main PWB
For 16 ppm GDI printer
Figure 2-3-3 Main PWB block diagram (For 16 ppm GDI printer)
The main PWB consists mainly of CPU (U1) and primarily performs the printing data processing and interface controls
with computers. The CPU (U1) outputs the laser light and executes printing following the flash memory (U4) that stores the
control programs being linked with the process and paper feeding/conveying mechanism that the engine/high voltage
PWB controls.
SYSCK
X2
OSC(video)
85.761 MHz
VOSC
X1 U2
YC2
YC3
YC4
Engine
I/F
APC
I/F
USB
I/F
USBDP
USBDN
48.000 MHz
OSC (USB)
(System)
RESIN, ESTSN
PDMSKN
VIDEON,
VDCLK,
ECPRDYN,
ERSTN,
P04, P05, 06
ESBSYN,
VBDN,
VXC,
EINTN,
P07
PLGCLK
SBSY, SDIR, EGIRN
ECCLKN, ECMDN
OUTPEN
VDATA
VDFONSPL
PDN
+5V1
+3.3 V reg
ulator
+3.3V1
U7
SDRAM address bus
SDRAM data bus
U1
U6
Gate array
RISC CPU
(Core+ASIC)
SDA11-0
SDD15-0
RASN, CASN, WEN, BA1, BA0
DQML, D1QMU
SDCSN0
SDCLK
FSSI
FSCK
FSRSTM
FSCSN
FSSO
U03
SDRAM
U4
Flash
memory
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