Description Of Components - Kenwood TK-880 Service Manual

TX-RX Unit (X57-6450-XX) (A/2)
-10 : K -11 : K2 -12 : K3 -13 : HK -14 : HK2 -15 : HK3
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
IC14 8V AVR
IC15 Flip-flop
IC200 Mixer
IC300 PLL
IC400 Power module
IC401 TX power amp
Q1 DC switch
Q2 Ripple filter
Q3 Ripple filter
Q4 HOR switch
Q5 HOR SW control
Q6 HOR SW control
Q7 Buffer amp
Q8 AF mute
Q9 AF mute
Q10 8R SW control
Q11 8R switch
Q12 8T switch
Q13 8T SW control
Q15 IF amp
Q16 AF switch
Q17 PC switch
Q18 DET mute
Q19 APC

DESCRIPTION OF COMPONENTS

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, TV
HNC, H/L, TOF, CODE3, CODE4,
PA, BUSY, W/N control
AM, LOK, STR, DM, OPT, CODE1,
CODE2, SQ control
External 5C
Quadrature detector, 2nd mixer,
OSC, IF amplifier, RSSI
5C
9C
8C
Power control
DBM
Reference 16.8MHz.
PLL lock : LD "H"
RF power 25W
R17 connection and, PTT "H" time
DI off
8CL
9CL
IGN
IGN
HNC "H" time on
HT
AM "H" time on
Power off time on
TR "H" time on
Q10 on time on
Q13 on time on
KEY "H" time on
44.85MHz
Wide time on
TX (8T) time on
KEY "H" time on
APC driver
Ref. No. Use / Function
Q20 APC APC pre-driver
Q21 APC control
Q22 TOF switch TOF "H" time on
Q23 W/N switch Wide time off
Q24 W/N switch Wide time on
Q25 TOF switch Q22 on time on
Q26 Inverter Power switch "L" time on
Q27 SB switch Q28 on time on
Q28 SB SW control Q30 on and Q31 off time on
Q29 H/L switch High power time "H"
Q30 SB SW control Power on time on
Q31 SB SW control DC 20V and over time on
Q32 DET mute TX time on
Q201 RF amp Low noise amplifier
Q202 RF amp TX drive first
Q203 Pre IF amp 44.85MHz
Q204 RF amp TX drive
Q205 RF amp TX drive last
Q300 Buffer amp PLL
Q301,302 Active filter
Q401 Short protection
Q402 W/N switch Wide time off
Q403 W/N switch Wide time on
D1~6 Protection
D7 HOR protection
D8,9 Protection
D11 AF mute
D12~14 Protection
D16 Reverse protection
D17 Protection
D20 Reverse protection IGN
D21 Protection 5V (IGN)
D22,23 W/N CF change
D24 Over current
protection
D26 Reverse protection
D27 Power detection
D28 Protection
D30 Power detection
D31 Reverse protection
D32 Surge absorption B
D34 Protection DC 20V and over time on
D35 Charge DEO
D37 Reverse protection
D40,41 RF switch
TK-880/H
Operation / Condition
35