Icom IC-M422 User Manual Download | Manualshive

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iC-m422

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Summary of Contents for IC-M422

Page 1: ...3 26 5 6 2 42 3 6 2 iC m422 ...

Page 2: ...r your convenience 1 Make sure the problem is internal before dis assembling the transceiver 2 DO NOT open the transceiver until the transceiver is disconnected from its power source 3 DO NOT force any of the variable components Turn them slowly and smoothly 4 DO NOT short any circuits or electronic parts An insulated turning tool MUST be used for all adjustments 5 DO NOT keep power ON for a long ...

Page 3: ...ATION 5 1 5 2 FREQUENCY ADJUSTMENT 5 2 5 3 TRANSMIT ADJUSTMENT 5 3 5 4 RECEIVE ADJUSTMENT 5 4 SECTION 6 PARTS LIST 6 1 IC M422 6 1 6 2 HM 150B SW 6 5 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY SECTION 8 SEMICONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 1 LOGIC BOARD 9 1 9 2 HM 150B SW 9 1 9 3 VR BOARD 9 3 9 4 SQL BOARD 9 3 9 5 MAIN UNIT 9 3 SECTION 10 BLOCK DIAGRAM SECTION 11 VOLTAGE DIAGRAM 11 ...

Page 4: ...power More than 70 dB Audio harmonic distortion Less than 10 at 60 deviation Residual modulation More than 40 dB Audio frequency response 1 dB to 3 dB of 6 dB oct from 300 Hz to 2500 Hz Microphone impedance 2 kΩ M RECEIVER Receive system Double conversion superheterodyne system Intermediate frequencies 1st IF 21 7 MHz 2nd IF 450 kHz Sensitivity 13 dBµ typical at 12 dB SINAD Squelch sensitivity At ...

Page 5: ... 4 6 5 2 2 6 5 1 5 2 2 6 5 1 A 5 6 A 5 6 5 7 2 6 5 1 5 7 2 6 5 1 5 2 3 6 5 1 5 2 9 0 6 1 7 6 2 7 6 5 7 3 6 5 1 5 7 3 6 5 1 8 6 8 6 5 2 4 6 5 1 5 2 4 6 5 1 9 6 9 6 5 7 4 6 5 1 5 7 4 6 5 1 0 7 3 0 7 3 5 2 5 6 5 1 5 2 5 6 5 1 1 7 1 7 5 7 5 6 5 1 5 7 5 6 5 1 2 7 2 7 5 2 6 6 5 1 5 2 6 6 5 1 3 7 3 7 5 7 6 6 5 1 5 7 6 6 5 1 4 7 4 7 5 2 7 6 5 1 5 2 7 6 5 1 7 7 1 7 7 1 5 7 8 6 5 1 5 7 8 6 5 1 5 2 9 6 5 1 5...

Page 6: ...2 1 SECTION 2 INSIDE VIEWS FRONT UNIT MAIN UNIT ...

Page 7: ...G THE MAIN UNIT 1 Disconnect W2 from the J2 and J3 2 Disconnect W4 and W5 from the J4 and J5 3 Unsolder the antenna connector C 2 points 4 Unsolder bottom side D 6 points as shown below 5 Unscrew 2 screws E and 6 screws F and 2 clips G to remove the MAIN unit from the chassis 3 Unscrew 4 screws B Note When replacing the screws 0 6 0 8 N m of torque MUST be applied to ensure water resistance 4 Slid...

Page 8: ... converted 1st IF signal from the 1st mixer is passed through the monolithic filters FI1 FI2 to suppress unwant ed signals and then amplified at the 1st IF amplifier Q23 The amplified 1st IF signal is applied to the FM IF IC IC2 pin 16 4 1 4 2nd IF AND DEMODULATOR CIRCUITS The 1st IF signal is converted into the 2nd IF signal and de modulated at the detector section in the FM IF IC The FM IF IC co...

Page 9: ...l Then the level adjusted MIC signals are applied to the modulation circuit 4 2 2 MODULATION CIRCUIT The modulation circuit modulates the VCO oscillating signal with the audio signals from the microphone The level adjusted MIC signals are applied to the modulation circuit D2 to modulate the VCO oscillating signal by chang ing the reactance of D2 at the VCO Q4 Q5 D3 D4 The modulated VCO output sign...

Page 10: ...lock voltage change to compensate for the drift in the oscillated frequency 4 4 DSC CIRCUITS DECODING A portion of the demodulated AF signals from the FM IF IC IC2 pin 9 are passed through the LPF Q38 to filter DSC signal The filtered DSC signal is applied to the DSC de coder IC15 pin 2 The decoded DSC signal is output from pin7 and then applied to the CPU LOGIC BOARD IC1 pin 14 Then the CPU contr...

Page 11: ...uit Q17 D11 High 25 W Low 1 W 55 ATT Outputs attenuator control signal to the attenuator D22 High Attenuator ON 57 PTT Input port for the PTT switch HM 150B SW S1 Low PTT key is pushed 60 UNLK Input port for the UNLK signal from the PLL IC IC1 pin7 High PLL circuit is unlocked 61 DTRS Input port for the DISTRESS key LOGIC BOARD S9 Low DISTRESS key is pushed 62 RMUTEP Outputs AF Public Address mute...

Page 12: ...6 key is pushed 76 DOWN Input port for the Z key LOGIC BOARD S2 Low Z key is pushed 77 UP Input port for the Y key LOGIC BOARD S1 Low Y key is pushed 138 DIM Outputs dimmer control signal to the LCD control circuit LOGIC BOARD Q2 Q3 139 BEEP Outputs beep signal to the AF amplifier IC9 pin 1 141 DS BPF While transmitting Outputs DSC encode signal as DSENC to the LPF IC8 pin 5 via the buffer amplifi...

Page 13: ...e 0 01 20 V FM deviation meter Frequency range 30 300 MHz Measuring range 0 to 10 kHz AC millivoltmeter Measuring range 10 mV to 10 V DC volt meter Input impedance 50 kΩ V DC or more External speaker Input impedance 4 Ω Capacity More than 5 W Attenuator Power attenuation 40 or 50 dB Capacity More than 30 W SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION M REQUIRED TEST EQUIPMENTS To the antenna co...

Page 14: ...CP1 1 1 2 1 V MAIN Verify 2 Channel CH16 156 800 MHz Output power Low Transmitting 0 9 1 9 V Verify REFERENCE FREQUENCY 1 Channel CH16 156 800 MHz Output power Low Connect a power meter to the antenna connector Transmitting Rear Panel Loosely couple a fre quency counter to the antenna connector 156 800 MHz 500 Hz MAIN C12 CP1 Lock voltage check point Reference frequency adjustment C12 5 2 FREQUENC...

Page 15: ...nel CH16 156 800 MHz Output power Low Connect an audio generator to the pin 28 of J4 MAIN UNIT and set as Frequency 1 kHz Level 30 mV Set the FM deviation meter as HPF OFF LPF 20 kHz De emphasis OFF Detector P P 2 Transmitting Rear Panel C o n n e c t a n F M deviation meter to the antenna con nector through an attenuator 4 25 4 35 kHz MAIN R327 R112 R327 Output power adjustment Frequency deviatio...

Page 16: ...set as Frequency 156 800 MHz Level 10 dBµ Modulation 1 kHz Deviation 3 kHz Receiving MAIN Connect a DC volt meter or oscilloscope to the check point CP3 Maximum voltage MAIN L35 L36 L38 L39 Repeate two times or more SQUELCH 1 Channel CH16 156 800 MHz SQL Max counterclockwise Set the SSG as Level 12 dBµ Receiving MAIN Connect a volt meter or oscilloscopeto the check point CP5 1 0 V MAIN R214 5 4 RE...

Page 17: ...3GEYJ 331 V 330 Ω B 12 4 39 R76 7030003380 S RES ERJ3GEYJ 331 V 330 Ω B 12 4 43 9 R81 7030003430 S RES ERJ3GEYJ 821 V 820 Ω B 87 3 10 R82 7030003520 S RES ERJ3GEYJ 472 V 4 7 kΩ B 21 4 39 5 R83 7030003440 S RES ERJ3GEYJ 102 V 1 kΩ B 70 9 12 R85 7030003680 S RES ERJ3GEYJ 104 V 100 kΩ B 12 7 27 5 R86 7030003210 S RES ERJ3GEYJ 120 V 12 Ω B 11 2 31 7 R87 7030003520 S RES ERJ3GEYJ 472 V 4 7 kΩ B 13 7 34...

Page 18: ...A1 FI1 2030000350 MLH 21R15AB FL 368 FI2 2030000270 MLH FL 363 21 7 MHz FI3 2020001680 CER ALFY450E X1 6050012120 S XTL CR 804 21 250 MHz T 49 29 6 X2 6070000200 DCR CDBLA450KCAY24 B0 L1 6200009560 S COL MLG1608B R10J T T 66 2 45 L2 6200010840 S COL MLG1608B 56NJ T T 61 4 42 8 L3 6200003090 S COL NL 322522T 2R7J 3 T 57 3 56 2 L4 6200008190 S COL 0 25 1 9 8TL 80N T 55 1 52 6 L6 6200009560 S COL MLG...

Page 19: ...100 kΩ T 21 9 9 1 R262 7030003680 S RES ERJ3GEYJ 104 V 100 kΩ T 27 7 10 4 R263 7030003800 S RES ERJ3GEYJ 105 V 1 MΩ T 26 4 8 3 R264 7030003450 S RES ERJ3GEYJ 122 V 1 2 kΩ T 32 8 11 8 R265 7030003520 S RES ERJ3GEYJ 472 V 4 7 kΩ T 30 6 13 5 R266 7030003800 S RES ERJ3GEYJ 105 V 1 MΩ T 30 3 20 REF ORDER DESCRIPTION M H V NO NO LOCATION MAIN UNIT R267 7030003800 S RES ERJ3GEYJ 105 V 1 MΩ T 30 2 22 1 R2...

Page 20: ...S CER C1608 JB 1H 102K T T 102 1 60 5 C164 4030009530 S CER C1608 CH 1H 030B T T 102 2 54 4 C165 4030006860 S CER C1608 JB 1H 102K T T 95 5 60 3 C173 4030011770 S CER C1608 CH 1H 060B T T 93 9 57 5 C174 4030009910 S CER C1608 CH 1H 040B T T 96 56 8 C175 4030009500 S CER C1608 CH 1H 0R5B T T 92 6 57 5 C176 4030009560 S CER C1608 CH 1H R75B T T 91 5 59 5 C177 4030009530 S CER C1608 CH 1H 030B T T 87...

Page 21: ...1CA101UP T 14 8 61 8 C387 4030011600 S CER C1608 JB 1E 104K T T 30 58 9 C388 4030006860 S CER C1608 JB 1H 102K T T 21 1 61 6 C389 4510004630 S ELE ECEV1CA100SR T 24 9 63 8 C390 4030011600 S CER C1608 JB 1E 104K T T 32 56 4 C391 4030006860 S CER C1608 JB 1H 102K T T 30 60 2 C392 4510004630 S ELE ECEV1CA100SR T 32 8 63 8 C393 4510004630 S ELE ECEV1CA100SR T 39 6 65 6 C411 4030006900 S CER C1608 JB 1...

Page 22: ...ctor MR DSE 01 1 W1 8900014000 Cable OPC 1405 TJM 1 W2 8900014090 Cable OPC 1489 AI 1 MP1 8510016590 Case 2807 CASE BLK 1 8510016620 Case 2807 CASE A SW 1 MP2 8830001730 Screw ultra sert UD 45058 NI 2 MP4 8930055070 2438 sheet 1 MP5 8930064040 2807 R packing seal 1 MP11 8010020100 2852 chassis 1 MP12 8930034300 1542 ANT seal KN 1 MP13 8810002950 Screw M3x6 SUS 2 MP14 8930064350 2807 R bush plate 1...

Page 23: ...7 2 IC M422 sm indd 9 10 4 21 2005 1 01 32 PM ...

Page 24: ...8 1 SECTION 8 SEMICONDUCTOR INFORMATION TRANSISTOR AND FET S DIODES ...

Page 25: ... 6 7 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 37 s 4 0 6 7 9 1 SECTION 9 BOARD LAYOUTS The combination of this page and the next page shows the unit layout in the same configuration as the actual P C Board IC M422 sm 2 indd 1 2 4 22 2005 1 35 26 PM ...

Page 26: ...6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 37 s 44 6 7 0 0 n 9 2 The combination of this page and the previous page shows the unit layout in the same configuration as the actual P C Board IC M422 sm 2 indd 3 4 4 22 2005 1 35 32 PM ...

Page 27: ...6 6 6 6 6 6 6 5 4 s 4 0 6 7 31 2 s 4 0 6 7 62 2 s 4 0 6 7 0 0 0 33 3 9 3 The combination of this page and the next page shows the unit layout in the same configuration as the actual P C IC M422 sm 2 indd 5 6 4 22 2005 1 35 33 PM ...

Page 28: ... 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 7 7 7 7 31 2 s 44 6 7 62 2 s 44 6 7 9 4 The combination of this page and the previous page shows the unit layout in the same configuration as the actual P C Board IC M422 sm 2 indd 7 8 4 22 2005 1 35 35 PM ...

Page 29: ...10 1 SECTION 10 BLOCK DIAGRAM IC M422 sm indd 21 22 4 21 2005 1 01 39 PM ...

Page 30: ...11 1 11 1 MAIN UNIT 6 6 6 6 6 6 6 28 6 28 6 48 6 48 6 6 28 6 6 6 SECTION 11 VOLTAGE DIAGRAM IC M422 sm indd 23 24 4 21 2005 1 01 40 PM ...

Page 31: ...11 2 48 6 6 28 6 48 6 6 6 6 28 6 28 6 6 6 6 6 48 6 6 6 6 IC M422 sm indd 25 26 4 21 2005 1 01 43 PM ...

Page 32: ...11 3 11 2 LOGIC BOARD IC M422 sm indd 27 28 4 21 2005 1 01 44 PM ...

Page 33: ...002000 1 Spring washer M4 SUS 3 1 MP19 MP20 8810010240 8930061700 Screw PH B0 2 2715 PTT plate 6 NI BT Screw BiH M4 8 ZK REF NO CHASSIS PARTS ORDER NO DESCRIPTION QTY MC1 7700002640 MIC KUC3523 040245 1 REF NO MAIN PARTS ORDER NO DESCRIPTION QTY Screw and washer abbreviations B0 BT Self Tapping PH Pan head NI Nickel SUS Stainless ZK Black BiH Bind head MAIN UNIT MP12 C MP3 C MP1 C MC1 M MP19 C MP1...

Page 34: ...d Centre 150 6165 Highway 17 Delta B C V4K 5B8 Canada Phone 1 604 952 4266 Fax 1 604 952 0090 URL http www icomcanada com E mail info icomcanada com A B N 88 006 092 575 Unit 1 103 Garden Road Clayton VIC 3168 Australia Phone 61 03 9549 7500 Fax 61 03 9549 7505 URL http www icom net au E mail sales icom net au 146A Harris Road East Tamaki Auckland New Zealand Phone 64 09 274 4062 Fax 64 09 274 470...

Page 35: ...S 14131MZ C1 2005 Icom Inc ...

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