Icom IC-T90A manual AF Unit, VCO Unit, Ext.Sp Ext.Micremoto

Page 48

9 - 3 AF UNIT

• TOP VIEW

EXT.SP

EXT.MICREMOTO

J252J253

to S251

The combination of this page and the next page shows the unit layout in the same configuration as the actual P.C. Board.

DN

E

UP

VCO UNIT

4

 

 

 

 

• TOP VIEW

 

 

 

3

 

 

 

 

1

 

2

 

 

to RF UNIT

 

 

 

 

 

to RF UNIT

1

GND

1

 

 

 

 

 

 

 

VSFT

8

V1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J2

V2

 

 

 

 

 

 

 

2

VMOD

 

 

 

 

 

 

 

3

 

8

VCO3

 

 

 

 

 

40

1

GND

 

 

 

 

 

 

 

J1

V3

 

 

 

 

 

 

+10V

 

 

 

 

 

 

39

 

 

 

LO

6

to LOGIC unit J1

 

 

 

UNLK

 

 

 

 

 

 

 

 

 

 

 

 

GND

40

 

 

 

CK

 

 

 

 

39

GND

 

 

 

PLSTB

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

CHG

 

 

 

 

REF

1

 

 

 

 

PATMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VMOD

XMOD

 

 

 

 

 

 

 

 

 

 

AFV

+3

 

 

 

 

 

 

6

 

 

 

+3C

 

 

 

 

 

 

 

 

 

DETO

 

 

 

 

 

 

 

 

 

 

VOLC

 

 

 

 

 

 

 

 

 

 

HV

VCC

 

 

 

 

 

 

 

 

 

 

MUTE

 

 

 

 

 

 

 

 

 

 

BEEP

J251

 

 

 

 

 

 

 

 

 

NOISE

EXTM

 

 

 

 

 

 

 

 

 

VSHFT

 

 

 

 

 

 

 

 

 

 

V1C

V2C

 

 

 

 

 

 

1

 

 

 

V3C

 

 

 

 

 

 

 

 

 

SD

 

 

 

 

 

 

 

 

 

 

REMO

 

 

 

 

 

 

 

 

 

 

R3C

 

 

 

 

 

 

 

 

 

 

DICK

 

 

 

 

 

 

 

 

 

 

DIUD

 

 

 

 

 

 

 

 

 

 

DATA

 

 

 

 

 

 

 

 

 

 

DASTB

 

 

 

 

 

 

 

 

 

 

IOSTB

TXC

 

 

 

 

 

 

 

 

 

 

AM

 

 

 

 

 

 

 

 

 

 

WFM

 

 

 

 

 

 

 

 

 

 

PDA/UL

 

 

 

 

 

 

 

 

 

 

PLSTB

 

 

 

 

 

 

 

 

 

 

CK

WXALT

 

 

 

 

 

 

 

 

 

 

INTSP

2

 

 

 

 

 

 

 

 

1

GND

+10V

2

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

9 - 5

Page 47 Page 49
Image 48
Page 47 Page 49
Contents IC-t90a Introduction Ordering PartsRepair Notes Sample OrderTable of Contents Specifications GeneralTransmitter Receiver Frequency MHzWFM WFMInside Views Logic UnitTop view Bottom viewAF Unit RF UnitTop view Bottom view Disassembly Instructions Removing the rear panel Removing the AF unitCircuit Description Receiver Circuits4 1ST Mixer and 1ST if Circuits RF, AF and VCO Units 5 2ND if and Demodulator Circuits AF UnitRF Circuit AF Amplifier Circuit AF Unit Squelch Circuitaf and Logic Units2ND if and Demodulator Circuit Transmitter Circuits PLL Circuits APC Circuit RF UnitGeneral APC CircuitVCO Divider Circuit VCO and RF Units PLL CircuitPower Supply Circuits 2 R3V Switch IC AF Unit IC51Port Allocations Voltage LineCPU Logic Unit IC1 Ctsel DtcsLCD SEG35Adjustment Procedures Operation on the Adjustment ModeOperation on the Output Power Adjustment PreparationConnection JIGAD-92SMA Trimmer Adjustment PLL LockVCO VoltageVCO Unit RF UnitL16 L456 L19Adjustment Mode Adjustments ReferenceDial FrequencyAdjustment Mode Adjustments PH ch 53.900 MHz Transmitting 8V 145 MHz Displayed frequency Connect an amme 45 a Logic Unit R325R365 R326Ctcss Detector CoilTracking AF Unit CP0IC151, pin 12 SD line L151Displayed frequency Connect a DC volt Maximum voltage Adjustment Adjustment Condition Operation MeterSection Parts List Order DescriptionCoil Eljre 3N9Z-F Ceramic ECJ0EB1H681K Connector AXK6S30445P Ceramic ECJ0EC1H060C Encoder Trimmer Tantalum ECST1EY474R Ceramic ECJ0EC1H2R5B Mechanical Parts and Disassembly AccessoriesChassis Parts Logic Unit RF UnitChassis Parts AF Unit VCO UnitSEMI-CONDUCTOR Information Transistors and FetsDiodes NameBoard Layouts TOP ViewMC1 Microphone DUPLogic unit Bottom ViewSP1 SQL PTTRF Unit RF unit AF Unit VCO UnitEXT.SP EXT.MICREMOTO S253S252 Block Diagram Logic UnitChassis Loop LPF HPF Drive BPF ANT FIL AMPVoltage Diagram 11 1 Logic UnitIC5 11 2 RF Unit 2SK347611 3 AF Unit BU4094BCFVURL 32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan
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