Icom IC-T90A manual Detector, Coil, Tracking

Page 28

ADJUSTMENT MODE ADJUSTMENTS (Continued)

The following adjustment must be performed at “ADJUSTMENT MODE”.

“DETECTOR COIL” adjustment must be performed on same channel as “DTCS DEVIATION ADJUSTMENT” (DT ch.).

 

 

 

 

 

MEASUREMENT

 

ADJUSTMENT

ADJUSTMENT

ADJUSTMENT CONDITION

VALUE

POINT

 

 

 

 

 

 

 

 

 

UNIT

LOCATION

 

UNIT

ADJUST

 

 

 

 

 

 

 

 

DETECTOR

1

• Displayed frequency :

AF

Connect a multime-

1.0 V

AF

L151

COIL

 

(DS ch.)

 

445.000 MHz

 

ter to

check

point

 

 

 

 

 

• Connect the SSG to the antenna

 

CP0.

 

 

 

 

 

 

 

connector and set as:

 

 

 

 

 

 

 

 

 

Level

 

: 1.0 µV*

 

 

 

 

 

 

 

 

 

 

 

(–47 dBm)

 

 

 

 

 

 

 

 

 

Modulation

: OFF

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RF

1

• Displayed frequency :

AF

Connect a DC volt-

Maximum voltage

Top

[DIAL]

TRACKING

 

(TL ch.)

30.100 MHz

 

meter

or

oscillo

 

panel

 

 

 

• Connect the SSG to the antenna

 

scope to the IC151,

 

 

 

 

 

connector and set as:

 

pin 12 (“SD” line).

 

 

 

 

 

Level

 

: 0.5 µV*

 

 

 

 

 

 

 

 

 

 

 

(–113 dBm)

 

 

 

 

 

 

 

 

 

Modulation

: 1 kHz

 

 

 

 

 

 

 

 

 

Deviation

 

: ±3.5 kHz

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TH ch.)

47.100 MHz

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TL ch.)

48.100 MHz

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TH ch.)

75.100 MHz

 

 

 

 

 

 

 

 

 

• Set the SSG as:

 

 

 

 

 

 

 

 

 

Level

 

: 1 µV*

 

 

 

 

 

 

 

 

 

 

 

(–107 dBm)

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TL ch.)

76.100 MHz

 

 

 

 

 

 

 

 

 

• Set the SSG as:

 

 

 

 

 

 

 

 

 

Level

 

: 1 µV*

 

 

 

 

 

 

 

 

 

 

 

(–107 dBm)

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TH ch.)

149.100 MHz

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TL ch.)

150.100 MHz

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TH ch.)

229.100 MHz

 

 

 

 

 

 

 

 

 

• Set the SSG as:

 

 

 

 

 

 

 

 

 

Level

 

: 3.2 µV*

 

 

 

 

 

 

 

 

 

 

 

(–97 dBm)

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TL ch.)

280.100 MHz

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

• Displayed frequency :

 

 

 

 

Maximum voltage

 

[DIAL]

 

 

(TM ch.)

370.100 MHz

 

 

 

 

 

 

 

 

 

• Set the SSG as:

 

 

 

 

 

 

 

 

 

Level

 

: 0.5 µV*

 

 

 

 

 

 

 

 

 

 

 

(–113 dBm)

 

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*This output level of the standard signal generator (SSG) is indicated as SSG’s open circuit.

 

 

 

 

 

 

 

 

5 - 11

 

 

 

 

 

Page 27 Page 29
Image 28
Page 27 Page 29
Contents IC-t90a Introduction Ordering PartsRepair Notes Sample OrderTable of Contents General SpecificationsTransmitter Receiver Frequency MHzWFM WFMInside Views Logic UnitTop view Bottom viewRF Unit AF UnitTop view Bottom view Disassembly Instructions Removing the rear panel Removing the AF unitCircuit Description Receiver Circuits5 2ND if and Demodulator Circuits AF Unit 4 1ST Mixer and 1ST if Circuits RF, AF and VCO UnitsRF Circuit Squelch Circuitaf and Logic Units AF Amplifier Circuit AF Unit2ND 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 PreparationJIG ConnectionAD-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 Coil DetectorTracking 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 Accessories Mechanical Parts and DisassemblyChassis 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 VCO Unit AF 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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