Main Microprocessor; Microprocessor Periphery Block Diagram; Key Matrix - Kenwood RXD-402 Service Manual

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4. Main microprocessor

4-1 Microprocessor periphery block diagram

X14, IC51
X14, IC52, 53
TE
L 13942296513
X04, IC7

4-2 Key matrix

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CIRCUIT DESCRIPTION
X28, IC1
X13, IC1
X04, IC3
x ao u163
y
i
RXD-402/452/502/552/572S/A41/A51
2 9
8
Q Q
3 6 7 1 3 1 5
SERIES
co
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9 4 2 8
X04, IC2
TUNER PACK IC2
0 5 8 2 9 9 4 2 8
X28, IC4
EXPANDER
m
9 9
9 9
7