Cdj-1143 Control Crcuit - JRC JRL-2000F Service Manual

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(2) ln the Antenna Tuner Mode
( R:Receivi!l& )
T:Transffilttmg
J1
KI
(3) ln the Linear Amplifier Mode
(R:Receiving )
T:Transmitting
R
J1
T
KI
2.6 CDJ-1143 Control Circuit
K2
~ ANTI
o---e
ANT2
~ ANT3
0----0
ANT4
K4toK7
Fig.7
ANTI
ANT2
ANT3
o---e
ANT4
K4toK7
Fig.8
The CDJ-1143 control circuit is on the printed circuit bdard attached to the upper part
of the JRL-2000F. lt incorporates an 8-bit microprocessor and controls the JRL-2000F
and monitors its operation.
(1 )Microprocessor Circuit
IC1 is an 8-bit single-chip CPU and equipped with 1/D ports, a timer, random access
memories and serial communication terminals.
Control programs are stored in ROM1.
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