Pioneer KEH-1800, Service Manual

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35
KEH-1800,1830
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Pin Functions (PD6293A)
Pin No. Pin Name I/O Function and Operation
1–5 SEG4-0 O LCD segment output 4-0
6–8 COM1-3 O Common driver output 1-3
9 COM0 O Common driver output 0
10 LCDB LCD bias power supply
11–14 KS3-0 O Key strobe output 3-0
15,16 KDT0,1 I Key data input 0,1
17 REM I Remote control reception
18 DPDT I Display data input
19
NC
Not used
20 KYDT O Key data output
21 MODA GND
22 X0 Crystal oscillator connection pin
23 X1 Crystal oscillator connection pin
24 VSS GND
25,26 KDT2,3 I Key data input 2,3
27,28 KST5,4 O Key strobe output 5,4
29–55 SEG39-13 O LCD segment output 39-13
56 VCC 5V
57–64 SEG12-5 O LCD segment output 12-5
IC's marked by* are MOS type.
Be careful in handling them because they are very
liable to be damaged by electrostatic induction.
80
1
20
21 40
41
60
61
*PE5017B
Format Meaning
C C MOS
*PD6293A
49
48
33
32
17
16 1
64