System Block Diagram - Olivetti ECR 7900 Service Manual

1-7 SYSTEM BLOCK DIAGRAM

Printer
LTPC235
Wind Motor
Buzzer
Drawer
Sol. Driver
FROM
S-RAM
+VCC5
+VPRN
+VDRW
-VPW
Power supply
VF
Y108540-8
Motor
Control
Print
Control
A0-A19
D0-D7
CS WE OE
A0-A18
D0-D7
CS WE OE
+VCC3
+VBB
ECR 7900 Service Manual
Main CPU
M30842MC
Key scans
Return
Rear Display
Display
Control
10digits 16segment VFD
Front Display
160 x 80 dots LCD
Keyboard
9.83 MHz
Main Clock
X'TAL
32.768KHz
Sub Clock
RS232C
RS232C
Driver
Interface
USB
Interface
SD CARD
Interface
Reset
Power Fail
Dry Battery
19