Icom IC-T90A manual Adjustment Adjustment Condition Operation, Meter

Page 31

ADJUSTMENT MODE ADJUSTMENTS (Continued)

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

ADJUSTMENT

 

 

ADJUSTMENT CONDITION

OPERATION

 

 

 

 

 

 

 

 

 

S-METER

1

• Displayed frequency :

 

 

 

Push the [BAND] key.

 

 

 

(SM ch.) 1.620 MHz

 

 

 

 

 

• Mode

: FM

 

 

 

 

 

 

• Connect the SSG to the antenna connector and set as:

 

 

 

 

Level

: 0.63 µV* (–111 dBm)

 

 

 

 

 

 

Modulation

: 1 kHz

 

 

 

 

 

 

Deviation

: ±3.5 kHz

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

• Same operation as step 1 for the listed frequencies and SSG

Push the [BAND] key.

 

 

 

level shown below.

 

 

 

 

 

 

• Some adjustment frequencies must adjust both FM and WFM

 

 

 

 

modes.

 

 

 

 

 

 

 

 

 

When adjust the WFM mode, set the SSG’s deviation as

 

 

 

 

±52.5 kHz.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ADJUSTMENT freq.

 

SSG level (FM)

SSG level (WFM)

 

 

 

 

(SM Ch.) 28.100 MHz

 

0.5 µV (–113 dBm)

–

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(SM Ch.) 51.000 MHz

 

0.5 µV (–113 dBm)

1.8 µV (–102 dBm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(SM Ch.) 145.100 MHz

 

0.5 µV (–113 dBm)

1.8 µV (–102 dBm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(SM Ch.) 180.100 MHz

 

0.63 µV (–111 dBm)

3.2 µV (– 97 dBm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(SM Ch.) 435.100 MHz

 

0.5 µV (–113 dBm)

–

 

 

 

 

 

 

 

 

 

 

 

 

 

(SM Ch.) 520.100 MHz

0.79 µV (–109 dBm)

3.2 µV (– 97 dBm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(SM Ch.) 729.100 MHz

 

0.5 µV (–113 dBm)

3.2 µV (– 97 dBm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

• AF UNIT

IC151, pin 12 (SD line)

RF Tracking check point

5 - 14

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Page 30 Page 32
Contents IC-t90a Sample Order IntroductionOrdering Parts Repair NotesTable of Contents General SpecificationsTransmitter WFM ReceiverFrequency MHz WFMBottom view Inside ViewsLogic Unit Top viewRF Unit AF UnitTop view Bottom view Removing the rear panel Removing the AF unit Disassembly InstructionsReceiver Circuits Circuit Description5 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 APC Circuit PLL CircuitsAPC Circuit RF Unit GeneralPLL Circuit VCO Divider Circuit VCO and RF UnitsVoltage Line Power Supply Circuits2 R3V Switch IC AF Unit IC51 Port AllocationsCPU Logic Unit IC1 SEG35 CtselDtcs LCDPreparation Adjustment ProceduresOperation on the Adjustment Mode Operation on the Output Power AdjustmentJIG ConnectionAD-92SMA Voltage Trimmer AdjustmentPLL Lock VCOL19 VCO UnitRF Unit L16 L456Frequency Adjustment Mode AdjustmentsReference DialAdjustment Mode Adjustments PH ch 53.900 MHz Transmitting 8V 145 MHz Displayed frequency Connect an amme 45 a R326 Logic UnitR325 R365Ctcss Coil Detector Tracking L151 AF UnitCP0 IC151, pin 12 SD lineDisplayed frequency Connect a DC volt Maximum voltage Meter Adjustment Adjustment Condition OperationOrder Description Section Parts ListCoil Eljre 3N9Z-F Ceramic ECJ0EB1H681K Connector AXK6S30445P Ceramic ECJ0EC1H060C Encoder Trimmer Tantalum ECST1EY474R Ceramic ECJ0EC1H2R5B Accessories Mechanical Parts and DisassemblyChassis Parts AF Unit VCO Unit Logic UnitRF Unit Chassis PartsName SEMI-CONDUCTOR InformationTransistors and Fets DiodesDUP Board LayoutsTOP View MC1 MicrophoneSQL PTT Logic unitBottom View SP1RF Unit RF unit VCO Unit AF UnitEXT.SP EXT.MICREMOTO S253S252 Logic Unit Block DiagramLoop LPF HPF Drive BPF ANT FIL AMP Chassis11 1 Logic Unit Voltage DiagramIC5 2SK3476 11 2 RF UnitBU4094BCFV 11 3 AF UnitURL 32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan
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