Function Block Diagram - UMAX Data Systems Astra 1220U Service Manual

Function Block Diagram

The following diagram reveals the functions of the scanner's main board.
NS_RS,NS_PH1,NS_PH2
TGI,SEL1,SEL2
R1,R2
J1
CCD connector
Resistance
VIDE
O
MCLK
LED_N
LED
J2
connector
A,B,/A,/B
J3
MOTOR connector
Q4
7805
Regulator
POWER
J4
JACK
U3
OSC
X1
48MHz
X2 XTAL
U4
24MHz
Gain
U1
LM9811
CCD Processer
RA0_8
U4
DD0_7
ASTRA 1220P
U2
ULN2003
Scanner Function
Motor Driver
+5V
+12V
M/B System Block Diagram
Fig. 2-3: System Block Diagram
(128,256K)
U5
DRAM
Data Storage
RD0_7
S_CTR1_3
S_STATUS0_4
PV8630
ASIC
DA0_7
U6
Vendor ID
74HC04
EMI Reduce
U_A,B,/A,/B
U_HOME,DETECT
Service Manual
D+
U S B USB
D - Connector
93C46
UTA connector
J7
ASTRA 1220U page 3
5