User manual ICOM IC-22S

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Manual abstract: user guide ICOM IC-22S

Detailed instructions for use are in the User's Guide.

[. . . ] To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. ORDERING PARTS Be sure to include the following four points when ordering replacement parts: 1. Quantity required <SAMPLE ORDER> 1130008350 S. IC LV2105V IC-22S MAIN UNIT Cover 5 pieces 10 pieces 8810009610 Screw FH M2. 6×6 ZK IC-22S REPAIR NOTES 1. DO NOT open the transceiver until the transceiver is disconnected from its power source. DO NOT keep power ON for a long time when the transceiver is defective. [. . . ] The digital AF signals from DI/AN switch (IC522, pin 2) are applied to the modulation circuit after being passed through the J3 via the "MODIN" line. · ALC CIRCUIT "THROUGH" from the CPU (MAIN unit; IC1, pin 80) Through switch MIC switch Microphone IC2, D4 MIC IC3A IC520 ALC switch IC514 ALC IC520 IC520 ALC switch Switch IC525 to the modulator circuit "ALC" from the CPU (MAIN unit; IC1, pin 81) "THROUGH" from the CPU (MAIN unit; IC1, pin 80) Power supply Q524 4-3 4-2-7 APC CIRCUIT (MAIN UNIT) The APC circuit protects the power amplifier from a mismatched output load and stabilizes the output power. The APC detector circuit (D14, D17, L39) detects forward signals and reflection signals at D14 and D17 respectively. The combined voltage is at minimum level when the antenna impedance is matched at 50 and is increased when it is mismatched. The detected voltage is applied to the differential amplifier (IC6, pin 2), and the power setting voltage is applied to the other input (pin 1) for the reference. When antenna impedance is mismatched, the detected voltage exceeds the power setting voltage. The output voltage of the differential amplifier (IC6, pin 1) controls the input current of the power module (IC10) to reduce the output power. An oscillated signal from the VCO passes thorough the LO and buffer amplifiers (Q9, Q12) is applied to the PLL IC (IC1, pin 6) and is prescaled in the PLL IC based on the divided ratio (N-data). The reference signal is generated at the reference oscillator (X1) and is also applied to the PLL IC. The PLL IC detects the out-of-step phase using the reference frequency and outputs it from pin 15. The output signal is passed through the loop filter (Q2, R6, R11­R15, C11, C12) and is then applied to the VCO circuit as the lock voltage via the "LV" line. 4-3-2 VCO CIRCUIT (MAIN unit) The VCO circuit contains a separate TX-VCO (Q6, D2, D4) and RX-VCO (Q7, D5, D38). The oscillated signal is amplified at the LO (Q9) and buffer (Q11) amplifiers, and is then applied to the T/R switching circuit (D6, D7). Low: While narrow passband width (±2. 5 kHz) is selected (FI2 is selected). High: While receiving. C5V 5 RXC +8V +5V 6 TXC T8 11 W/N R5V 14 SHIFT 4-5 4-5-3 CPU (LOGIC UNIT; IC1) Pin number 1 2 3 4 5 6 7 Port name CTCIN SQLV MICUD SD LVIN TEMP DET0 Description Input port for the CTCSS/DTCS signals. Input port for the transceiver's internal temperature detecting signal. Output LCD backlight brightness controls signals Outputs the CPU clock shift control signal. Input port for the noise pulse signal for squelch and CPU. Pin number 53­55 56, 57 58­61 62 Port name IS0­IS2 Description Output initial matrix strobe signals. KS1, KS2 Output key scan signals KR3­KR0 PTT Input ports for the keyboard matrix signals. High : Digital is selected. 64 DI_SEC 65 Outputs filter characteristic control signal while the UT-115 is installed. · Outputs serial data to D/A convertor (MAIN unit; IC5, pin 8). · Outputs DTMF clock signal to the expander IC (MAIN unit; IC2, pin 2). · Outputs strobe signal to the D/A converter (MAIN unit; IC5, pin 6). Input port for the optional unit detecting signal. 66 SO 8 9 10 14 19 25 26 28 29 30 31 34 35 40 COLOR DIM0 DIM1 CSHIFT RESET PWRSW NOIS DICK DIUD CLIN CLOUT SCK BUSY 67 OPSCK 68 OPV1 DASTB 69 OPV2 73 Input ports for encoder signals. Outputs serial clock signal to the D/A convertor (MAIN unit; IC5, pin 7). [. . . ] · Transmitting : 146. 0 MHz · Turn the [DIAL] to set to ±4. 6 kHz. FREQUENCY 1 · Operating frequency · IF bandwidth : Wide · Push the [S. MW] key after finish adjustment. DEVIATION · Connect an audio generator to the [MIC] jack and set (Analog) as : 1 kHz/80 mV rms [dE] · Connect an FM deviation meter to the antenna connector and set as : HPF : OFF LPF : 20 kHz De-emphasis : OFF Detector : (P­P)/2 · Transmitting : 146. 0 MHz · Turn the [DIAL] to set to ±1. 25 kHz. DIGITAL VCO 1 · Operating frequency · IF bandwidth : Wide · Push the [S. MW] key after finish adjustment. [. . . ]

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