Icom IC-756PRO III Handbuch

IC-756PRO Alignment Procedure

PLL Board

Reference Oscillator

- Connect Frequency counter to P81 on the PLL board

- Adjust L53 and R33 for 64.000000MHz

- Connect RF volt meter to P81 on the PLL board

- Adjust L81 and L82 for maximum level

LPL A

- Set display to 0.0300000MHz, LSB

- Connect multi-meter to check point LPA

- Adjust C154 for 2.0V

VCO A

- Connect multi-meter to check point LVA

- Set display to 7.999999MHz, USB

- Adjust C278 for 4.3V

- Set display to 19.999999MHz, USB

- Adjust C258 for 4.3V

- Set display to 44.999999MHz, USB

- Adjust C228 for 4.3V

- Set display to 60.000000MHz, USB

- Adjust C208 for 4.3V

1LOA

- Connect RF volt meter to P351

- Set display to 0.030000MHz

- Verify RF output level for 0dBm or higher

- Set display to 7.999999MHz

- Verify RF output level for 0dBm or higher

- Set display to 8.000000MHz

- Verify RF output level for 0dBm or higher

- Set display to 19.999999MHz

- Verify RF output level for 0dBm or higher

- Set display to 20.000000MHz

- Verify RF output level for 0dBm or higher

- Set display to 44.999999MHz

- Verify RF output level for 0dBm or higher

- Set display to 45.000000MHz

- Verify RF output level for 0dBm or higher

- Set display to 60.000000MHz

- Verify RF output level for 0dBm or higher

LPL B

- Connect multi-meter to check point LPB

- Set display to 0.0300000MHz, USB

- Adjust C454 for 2.0V

VCO A

- Connect multi-meter to check point LVB

- Set display to 7.999999MHz, USB

- Adjust C578 for 4.3V

- Set display to 19.999999MHz, USB

- Adjust C558 for 4.3V

- Set display to 44.999999MHz, USB

- Adjust C528 for 4.3V

- Set display to 60.000000MHz, USB

- Adjust C508 for 4.3V

1LOA

- Connect RF volt meter to P651

- Set display to 0.030000MHz

- Verify RF output level for 0dBm or higher

- Set display to 7.999999MHz

- Verify RF output level for 0dBm or higher

- Set display to 8.000000MHz

- Verify RF output level for 0dBm or higher

- Set display to 19.999999MHz

- Verify RF output level for 0dBm or higher

- Set display to 20.000000MHz

- Verify RF output level for 0dBm or higher

- Set display to 44.999999MHz

- Verify RF output level for 0dBm or higher

- Set display to 45.000000MHz

- Verify RF output level for 0dBm or higher

- Set display to 60.000000MHz

- Verify RF output level for 0dBm or higher

3LO

- Connect RF volt meter to P701

- Verify RF output level for –16dBm or higher

S3LO

- Connect RF volt meter to P801

- Verify RF output level for –7dBm or higher

S2LO

- Connect RF volt meter to P901

- Verify RF output level for 0dBm or higher

Marker

- Connect oscilloscope to P851

- Verify output signals for 4Vpp or higher

PA Board

Driver idling current

- Set the mode to CW

- Open W29 leads, and connect current meter

- Transmit

- Adjust R11 for 100mA

- Close W29

Final idling current

- Set the mode to CW

- Open L8 side of R28 leads, and connect current meter

- Transmit

- Adjust R18 for 500mA

- Close R28

FAN

- Install multi-meter between J11-1 and ground

- Transmit

- Verify the voltage between 6V and 8V

- Receive

- Jumper between CP1 and CP2

- Verify the voltage for 12V

Main Board

Initial setup for alignment

- Reset the microprocessor (Hold “F-INP”and “M-CL”buttons and turning radio on)

- Setup the radio as below

- Frequency: 14.100000MHz

- Filter: 2.4KHz

- Mode: USB

- Pre-amp: P.AMP1

- Antenna: ANT1

- Meter: Po meter

- Attenuater: OFF

- AGC: MID

- VOX: OFF

- Tuner: OFF

- Monitor: OFF

- Noise Blanker: OFF

- NR SW: OFF

- RF/SQL: Center

- Balance: Center

- NR Level: CCW

- MIC Gain: Center

- RF Power: CW

- COMP Level: Center

- KEY Speed: Center

- BK-IN Delay: Center

- Notch: OFF

- Notch Center

- CW Pitch: Center

- RIT: OFF

- Delta TX: OFF

Transmitter

- Connect RF power meter to ANT connector

- Connect AF signal generator to mic connector

- Apply 1.5KHz/1mV signals to mic connector

- Transmit

- Adjust MIC GAIN pot on the front panel for 50W

- Adjust L261 for maximum RF output power

Transmit Total Gain

- Connect RF power meter to ANT connector

- Connect AF signal generator to mic connector

- Apply 1.5KHz/1mV signals to mic connector

- Set MIC GAIN pot on the front panel to center

- Adjust R263 for 50W

IC APC

- Connect RF power meter to ANT connector

- Set radio to 3.550000MHz, RTTY

- Ground CP501

- Transmit

- Adjust R545 for 23A

HF RF Power

- Connect RF power meter to ANT connector

- Set radio to 14.100000MHz, RTTY

- Transmit

- Adjust R507 for 105W

50MHz RF Power

- Connect RF power meter to ANT connector

- Set radio to 50.000000MHz, RTTY

- Transmit

- Adjust R509 for 100W

FM transmit modulation

- Set Radio to follows

- Frequency: 29.60000MHz

- Mode: FM

- Filter: 15KHz

- RF POWER: Maximum

- Mic Gain: Center

- Connect Modulation analyzer to ANT connector

- Connect AF signal generator to mic connector

- Apply 1KHz/10mV signals to mic connector

- Transmit

- Adjust R2227 on DSP board for 4.5KHz

- Apply 1KHz/1mV signals to mic connector

- Verify transmit modulation for 3.5KHz

AM Carrier Power

- Set radio to 14.100000MHz AM

- Set RF POWER pot to maximum

- Connect RF Power meter to Antenna connector

- Connect AF signal generator mic connector

- Apply no signals to mic connector

- Transmit

- Adjust R510 for 40W

- Apply 1KHz/10mV signals to mic connector

- Adjust R2229 on DSP board for 90%

Speech processor

-Set R392 to Center

RX Receiver

- Set radio to follows

- Frequency: 14.1015MHz

- Mode: USB

- Shift: 0

- Filter 2.4KHz

- Connect RF signal generator to ANT connector

- Connect SINARDER to external SP Jack

- Receive

- Adjust L111, L112 and L113 for maximum level

RX Total Gain

- Set radio to follows

- Frequency: 14.1015MHz

- P AMP: OFF

- Mode: USB

- Shift: 0

- Filter 2.4KHz

- Connect RF signal generator to ANT connector

- Connect SINARDER to external SP Jack

- Apply 14.1015MHz/54dBu signals to ANT connector

- Apply no signals to ANT connector

- Adjust R210 for 30dB between with signals and without signals

Noise Blanker

- Set radio to follows

- Frequency: 14.1015MHz

- P AMP: OFF

- NB: OFF

- Mode: USB

- Shift: 0

- Filter 2.4KHz

- Set R271 to center

- Connect noise generator to ANT connector

- Connect oscilloscope to CP271

- Apply noise signals to ANT connector

- Adjust L272 for maximum level

- Turns noise blanker on

- Apply 20dBu noise signals to ANT connector

- Adjust R271 for removing noise signals

RF board

- Setup the radio as below

- Frequency: 14.100000MHz

- Mode: USB

- Attenuater: OFF

- Dual watch: OFF

- RF/SQL: Center

- RF Power: Maximum

- R863: Center

- R872: Center

Transmitter

- Connect RF power meter to ANT connector

- Connect AF signal generator to mic connector

- Connect RF volt meter to J151

- Apply 1.5KHz/1mV signals to mic connector

- Transmit

- Adjust L713. L712 and L711 for maximum voltage

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