Description Of Components - Kenwood TK-782 Service Manual

SEMOCONDUCTOR DATA /

DESCRIPTION OF COMPONENTS /

" Terminal function (TX-RX unit A/2 IC8)
Pin No. Port Name
1 STB ES Strobe
2 SI DT DATA
3 CLK CK Clock
4 Q1 AM1 Audio mute 1. H : Mute, L : Unmute
5 Q2 LOK Link complete.
(Programmable active H/L)
6 Q3 STR VCO shift switching. H : TX, L : RX
7 Q4 DM DET mute. H : RX, L : TX
8 VSS GND
9 QS IC7 data output
10 NC
11 Q8 SQ External squelch.
(Programmable active H/L)
12 Q7 CODE2 MIC hook logic signal.
(Programmable active H/L)
13 Q6 CODE1 PLL unlock signal.
(Programmable active H/L)
14 Q5 OPT Auxiliary B.
15 OE Output
16 VDC +5V.
DESCRIPTION OF COMPONENTS
TX-RX Unit (X57-6143-01) (A/2)
Ref. No. Use / Function
IC1 DC amp
IC2 DET amp
IC3 Amp/Summing amp
IC4 Analog switch
IC5 A/D converter
IC6 DC amp
IC7 Shift register
IC8 Shift register
IC9 5V AVR
IC10 AF power amp
IC11 FM IF DET
IC12 5V AVR
IC13 9V AVR
Function
Operation / Condition
FC, TCXO control
External DEO, internal DEO
DI / DI and MO addtion
DI switch
PC, TV, FC, AFO, BEEP , TO, MO
control
PC
HNC, H/L, TOF, PA, W/N control
AM, LOK, STR, DM, OPT, CODE1,
CODE2, SQ control
External 5C
Quadrature detector, 2nd mixer,
OSC, IF amplifier, RSSI
5C
9C
"
TK-782
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