Semiconductor Data - Kenwood TK-8102H Service Manual

CIRCUIT DESCRIPTION / SEMICONDUCTOR DATA
Power Supply Circuit
When the POWER switch on the display unit is pressed,
the power port on the display unit which is connected to
CPU port 18 (POWER), goes low, then CPU port 93 (SBC)
goes high, Q34 turns on, SB SW (Q42) turns on and power
(SB and BSB) are supplied to the radio.
This circuit has an overvoltage protection circuit. If a DC
voltage of 18 V or higher is applied to the power cable, D39
turns on and a voltage is applied to the base of Q38. This
voltage turns Q38 on and turns Q34, BSB and SB off.
BSB
Q42
B
SW
Q16 Q34
IGN
SW SW
SBC
IC6
5M
CPU
POWER
POWER
SW
Fig. 16 Power supply circuit
B
D39
Q38
SW
5M
IC17
AVR
IC15
RESET
IC18
INT

SEMICONDUCTOR DATA

Microprocessor : 784214AGCXXX
(TX-RX Unit IC6)
Terminal function
Pin No. Name I/O
1 NC I
2 DTMOSC O
3 PLLE O
4 EVLLD O
5 DTMCK O
6 DTMDT I/O
7 UL O
8 BSHIFT O
9 VDD -
10 X2 -
11 X1 -
12 VSS -
13 NC -
14 NC -
15 RESET -
16 INT I
17 DMTSDT I
18 POWER I
19 IGN I
20 TX/RX O
21 LEDMON O
22 LEDPF O
23 AVDD -
24 AVREF -
25 QTIN I
26 SQIN I
27 RSSI I
28 PWRPRCT I
29 BATT I
30 TEMP1 I
31 TEMP2 I
32 TEMP3 I
33 AVSS -
34 DTM/BEEP O
35 QT/DQT O
TK-8102H
Function
DTMF IC Clock Control
PLL IC Chip Select
E-Volume LD
DTMF Dec IC Clock
DTMF Dec IC Data
Unlock Detect
Clock Shift
X'TAL (7.3728MHz)
X'TAL (7.3728MHz)
GND
OPEN
GND
CPU RESET
COM Stop
DTMF Dec IC STD
Power Key Input
Ignition
TX/RX
LED for MON Key
LED for PF Key
+5V
+5V
QT/DQT Input
Squelch Input
RSSI Input
Power Protect
Battery Voltage
Temperature 1
Temperature 2
Temperature 3
GND
DTMF/Beep Output
QT/DQT Output
15