Service manual

20
32 VSS IN Power source voltage: -5.0V.
VC voltage of power source circuit input.
33 P27 OUT Terminal not used.
34 P26 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G7 line keys on key matrix is touched.
35 P25 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G6 line keys on key matrix is touched.
36 P24 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G5 line keys on key matrix is touched.
37 P23 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G4 line keys on key matrix is touched.
38 P22 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G3 line keys on key matrix is touched.
39 P21 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G2 line keys on key matrix is touched.
40 P20 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G1 line keys on key matrix is touched.
41-50 P17-P08 OUT Terminal not used.
51-72 SEG21-SEG0 OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)
SEG 21 (51) ........................ SEG21 (26) SEG 10 (62) ....................... SEG10 (15)
SEG 20 (52) ........................ SEG20 (25) SEG 9 (63) ........................ SEG 9 (14)
SEG 19 (53) ........................ SEG19 (24) SEG 8 (64) ........................ SEG 8 (13)
SEG 18 (54) ........................ SEG18 (23) SEG 7 (65) ........................ SEG 7 (12)
SEG 17 (55) ........................ SEG17 (22) SEG 6 (66) ........................ SEG 6 (11)
SEG 16 (56) ........................ SEG16 (21) SEG 5 (67) ........................ SEG 5 (10)
SEG 15 (57) ........................ SEG15 (20) SEG 4 (68) ......................... SEG 4 ( 9)
SEG 14 (58) ........................ SEG14 (19) SEG 3 (69) ......................... SEG 3 ( 8)
SEG 13 (59) ........................ SEG13 (18) SEG 2 (70) ......................... SEG 2 ( 7)
SEG 12 (60) ........................ SEG12 (17) SEG 1 (71) ......................... SEG 1 ( 6)
SEG 11 (61) ........................ SEG11 (16) SEG 0 (72) ......................... SEG 0 ( 5)
73/74 VCC/VREF IN Connected to GND.
75 AVSS IN Connected to VC.
76 COM3 OUT Terminal not used.
77 COM2 OUT Common data signal: COM2.
Connected to LCD signal COM2.
78 COM1 OUT Common data signal: COM1.
Connected to LCD signal COM1.
79 COM0 OUT Common data signal: COM0.
Connected to LCD signal COM0.
80 VL3 IN Power source voltage input terminal.
Standard voltage for LCD.
Pin No. Signal I/O Description