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IC Descriptions for UK4B
IC1110
This is a switching IC, NJM2233BM, which allows the sync signal input on monitor sets to be switched between pin
20 of SCART 1 (conventional) and pin 14 of SCART 1 (SIS signal). The IC takes a 5V supply and is switched by the
control line SIS.
IC1205
This a ROHM BA7603F triple video switch which allows the RGB input to be switched between SCART 1 and
SCART 2. The switch is controlled by the RGB_SW line from the IC.
IC1271
This a large multiway electronic switch, MM1631BJBE. Via the I
2
C lines the cpu can select any audio input L/R pair
and feed them to scart 3 or IC801.
IC151
BA2904F - this is an OP-AMP used to amplify the AGC voltage back to IC801.
IC1801/1802
2
2
PCA9534PW - These are I
C expander IC's. They convert I
C commands from IC801 into control lines.
IC1841/1851
These are OP-AMPS used to control the speed of the fans
IC2002/2003
6db AMP/BUFFERS that compensate for internal loss in the YPbPr / RGB / HV loop.
IC2006
RS232 to 5v decoder / encoder. It converts the RS232 signal from K2008 into a TTL signal that can be understood
by the CPU IC2010
IC2007 / 8 / 11
5v to 3.3v logic conversion for the CPU IC2010
IC2009
Reset pulse generator for the CPU IC2010
IC2010
CPU with internal program flash memory. The software version programmed into this device can be found in the
2
service menu. The RS232 data is converted into I
C data by this CPU and fed to the main CPU via KCPA.
All RS232 protocol are generated by this IC.
IC2012
This is a 5v regulator.
IC4001
This is a SST SST39VF020 CMOS multi-purpose flash with a capacity of 2Mbits. It is connected to the LOC using
address lines, data input/output, write enable and control lines. The flash IC is powered by the 3V3 SW supply.
IC4002
This is a ROHM BD5260G open drain voltage detector IC which works in conjunction with the main power and the
3.3V standby line to control the back lights.
IC601
This is a "current mode PFC controller" operating in transition mode. It is used in conjunction with L603 as active
power phase correction.
-19-
N4JK
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