Service manual

Circuit Descriptions
6-8 Samsung Electronics
6-3 System Control
6-3-1 Outline
The main micom peripheral circuit is composed of 16bit Micom (MIC1 ; TMP93CM41F), 8M EPROM (MIC8 ; AM27-
C080) for Microcode and data save, 512 byte EE-PROM (MIC5 ; KS24C020) for permanent storage of data needed at
power off, MIC4 (74AC573) to latch only address in the bus where address and data are mixed, address decoder
(MIC7 ; 74HC00) for selection of ex-ternal device chip and 20MHz clock oscillator for micom operation. The Micom
(MIC1 ; TMP93CM41F) mounted in main board analizes the key commands of front panel or instructions of remote
control through communication with Micom (FIC1 ; LC86P6232) of front and controls the devices on board to exe-
cute the corresponding commands after initializing the devices connected with micom on board at power on.
6-3-2 Block Diagram
RIC1
RF AMP
KS1461
SIC1
DIGITAL SERVO
KS1452
VIC1
A/V DECODER
ZIVA-3
VIC50
VIDEO ENCODER
SAA7128/7120
AIC1,2,3,4
D/A CONVERTER
AK4324
DIC1
DATA PROCESSOR
KS1453
MIC2
ADDR LATCH
74AC573
MIC1
MAIN MICOM
TMP93CM41F
MIC8
EPROM
AT27C080
MIC5
EEPROM
KS24C020
MICOM
BLOCK
HIGH ADDRESS
LOW ADDRESS
DATA BUS
FIC1
FRONT MICOM
LC86P6232
MIC7
ADDR DECODER
74HC00
Fig. 6-13