Circuit Explanation; Block Diagram - Casio BN-10 Service Manual & Parts List

9. CIRCUIT EXPLANATION

9-1. Block Diagram

(BN-20 only)
EL driver
DC/AC inverter
(BN-20 only)
EL
34.5 kHz
Common-
LCD
TAB(LSI3)
319 × 160 dots
Clock
Segment-TAB
(LSI4, 5)
Bias
generator
for LCD (IC708)
Electronic
contrast
adjustment
VLCO
POWER SUPPLY
V5EXT
V2SYS
V3SYS
V5SYS
AC Adapter
AD-A70140
KEYS
KI/KO
CPU
TX/RX
(LSI1)
Clock
10.14 MHz 32.768 kHz
Data bus
Gate array
(LSI2)
RX/TX
TX/RX
RX/TX
MODEM
BW-100
CPU
TELEPHONE
CPU/Gate array etc.
— 44 —
Address bus
Buzzer
TX/RX
Line driver/receiver
(IC501)
TX/RX
START BUTTON
RX/TX
MINI CRADLE
RS-232C
Personal computer
1 Mbits S-RAM
(LSI303)
16 Mbits
MASK ROM
(LSI301)
8 Mbits
FLASH ROM
(LSI304)
(BN-20 only)
8 Mbits
FLASH ROM
(LSI306)
8 Mbits
FLASH ROM
(LSI308)