Motorola
IC-T81E, IC-T81A
service manual
5566I-S, Icom Inc
Specifications
Parts list
Block Diagram
Reset
Accessories
Disassembly Instructions
Adjustment Procedures
PLL Adjustment
Mode Xtal BPF PDA2, CK AMP
Page 53
A-5566I-S-
1
1-1-32,
Kamiminami,
Hirano-ku,
Osaka,
547-0003,
Japan
© 1999 Icom Inc.
Page 52
Page 53
Image 53
Page 52
Page 53
Contents
Multiband FM Transceiver
Ordering Parts
Introduction
Repair Notes
Sample Order
Table of Contents
General
Specifications
Transmitter
Version 50 MHz 145 MHz 440 MHz 1200 MHz MHz RX only
Band
Receiver
WFM
WFM
Logic Unit
Inside Views
RF Unit
CPU
Removing the Chassis Panel Removing the Shield Plate
Disassembly Instructions
Removing the Logic Unit Removing the RF Unit
Logic unit
Circuit Description
Antenna Switching Circuits RF Unit
Receiver Circuits
Duplexer Circuit RF Unit
7 1ST Mixer Circuit RF Unit
Transmitter Circuits
APC Circuits RF Unit
DRIVE/POWER Amplifier Circuits RF Unit
MHz PA
APC Control Circuit
PLL Circuits
Power Supply Circuits Voltage Line
Line Description
VCC
1 I/O Expander IC RF Unit IC2
Port Allocations
2 I/O Expander IC RF Unit IC3
Pin Port Description Number Name
CPU Logic Unit IC1
Preparation
Adjustment Procedures
‘ Required Test Equipment
Connection
PLL Adjustment
ULV
RF Unit Bottom View
VLV
RF Unit TOP View 6MLV
Dial
Receiver Adjustment
Sensitivity
VHF
Logic Unit TOP View
SSG
Meter
Top Push and hold MHz band
101 dBm
Push and hold
Displayed frequency
445.000 MHz USA-1
SQL key
Transmitter Adjustment
HPF OFF LPF
Deviation
Dtmf
AUS, SEA
=Surface mount
Parts List
Trimmer
Ceramic ECUE1H121JCQ
Transistor UN911D TX
Coil Eljnd R10J 0.1U
Themistor
Ceramic ECUE1H060CCQ
Ceramic ECUE1H390JCQ
VCO Board
Ceramic ECUE1H120JCQ
Accessories
Mechanical Parts and Disassembly
Chassis Parts
VCO Unit
MP29 C
Diodes
SEMI-CONDUCTOR Information
Transistor and FET’S
TOP View
Board Layouts
Logic Unit
IC1
Bottom View
IC3
GND Pset Ifin
IC6
RF Unit
L912
J4 to Logic unit J1
IC2
MP1
IC3
J302 to RF unit
VCO Board
OUT 12VCOOUT
VLVCO3 VHF GND VHVCO3 UVCO3 Uhfout GND 12VCO3 GND
Q354
Block Diagram
TX/RX Frequency
Mode Xtal BPF PDA2, CK AMP
TX/RX Buff
ANT LPF HPF AMP
Mode Xtal Initial BPF
Reset
MOD TX/RX Frequency
ANT Buff HPF LPF YGR
Logic Unit
Section Voltage Diagram
Oscin Mixin Oscout GND Mixout REC VCC DET Ifin Rssi
2NDLO
DEC Ifout Filout Quad
WFM NTCCF20124AH 473KCT TXC
COM3 COM2 Reset Power
12VCO COM2 Reset
Clonein VCC VIN Cpuhv
COM4 COM3 COM2 COM1
VHF
RF Unit
400M
1200M
00M
50M
1200MHz
400MHz
PLST1 IN1
GND1
ENB VCC2
LOK GND2
Icom America Inc
Icom Inc
5566I-S
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