Icom IC-756PRO III Manual
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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