Kenwood TK-790 Service Manual page 33

Microprocessor : 78064GCXXX8EU (Display Unit IC4)
• Terminal function
Pin No. Pin name I/O
1 PTT I
2 K5 I
3 K6 I
4 K7 I
5 K8 I
6 K9 I
7 K10 I
8 AVDD –
9 AVREF –
10 RED O
11 GRN O
12 E –
13 DM1 O
14 DM2 O
15 I
16 K11 I
17 K12 I
18 K13 I
19 K1 I
20 K2 I
21 1/2 I
22 B/F I
23~26 COM0~3 O
27 BIAS
28~30 VLC0~2
31 VSS
32~67 S0~35 O
68 S36 O
CE
69 S37 O
CL
70 S38 O
DI
71 S39 O
DO I
72 SCK O
73 SDT I/O
SEMICONDUCTOR DATA
Action
MIC PTT L : ON, H : OFF
[MON] key L : ON, H : OFF
[PF6] key L : ON, H : OFF
[PF1] key L : ON, H : OFF
[PF2] key (Full) L : ON, H : OFF
[PF3] key (Full) L : ON, H : OFF
[PF7] key (Full) L : ON, H : OFF
+5V
+5V
TX LED (Red) L : ON, H : OFF
BUSY LED (Green) L : ON, H : OFF
GND
Backlight (Dimmer)
Backlight (Dimmer)
Not used
[SCN] key (Full) L : ON, H : OFF
[PF8] key (Full) L : ON, H : OFF
[PF9] key (Full) L : ON, H : OFF
[PF4] key L : ON, H : OFF
[PF5] key L : ON, H : OFF
HEAD 1/2 jumper
HEAD 1 : Jumper installed,
HEAD 2 : Jumper removed
Panel type Jumper
Basic panel : Jumper installed.
Full panel : Jumper removed
LCD drive common 0~3
LCD drive bias
LCD drive power suply
GND
LCD drive segment 0~35
LCD drive segment 36 (Basic)
DOT matrix driver CE (Full)
LCD drive segment 37 (Basic)
DOT matrix driver CL (Full)
LCD drive segment 38 (Basic)
DOT matrix driver DI (Full)
LCD drive segment 39 (Basic)
DOT matrix driver DO (Full)
EEPROM serial clock
EEPROM serial data
TK-790/
Pin No. Pin name I/O
74
75 RXD I
76 TXD O
77
78 –
79 X2 –
80 X1 –
81 VDD –
82,83
84 RST –
85 END I
86 K3 I
87 K4 I
88 ENI I
89 TEST I
90 AO2 O
91 AO1 O
92 AI2 I
93 AI1 I
94 BLC O
95,96
97 DM I
98 HK I
99 AVSS –
100 VOL I
Shift Register Output
• Shift register 1 on control unit (IC523)
Pin No. Port Name
4 Q1 PTO GE-STAR/Scrambler PTO
5 Q2 BC4 Scrambler BC4
6 Q3 BC3 Scrambler BC3
7 Q4 BC2 Scrambler BC2
14 Q5 AC Scrambler AC
13 Q6 BC1 Scrambler BC1
12 Q7 HR Acc HR
11 Q8 CMP Compander
( B ) /H
Action
Not used
Serial interface RXD
Serial interface TXD
Not used
GND
X'tal 4.19MHz
X'tal 4.19MHz
+5V
Not used
Reset
Encoder data
L : ON, H : OFF
[GR ] Key
L : ON, H : OFF
[GR ] Key
Encoder interrupt
Serial interface test
Programable AUX output B
Programable AUX output A
Programable AUX input B
Programable AUX input A
MIC backlight ON/OFF
L : ON, H : OFF
Not used
DTMF MIC key pad data input
L : ON, H : OFF
MIC hook
GND
AF volume
Action
H : ON, L : OFF
( B )
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