Icom IC-400PRO Service Manual
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Icom IC-400PRO Service Manual

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SERVICE
MANUAL
UHF TRANSCEIVER
i400PRO

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Summary of Contents for Icom IC-400PRO

  • Page 1 SERVICE MANUAL UHF TRANSCEIVER i400PRO...
  • Page 2 This service manual describes the latest service information NEVER connect the transceiver to an AC outlet or to a DC for the IC-400PRO UHF TRANSCEIVER at the time of publi- power supply that uses more than 16 V. This will ruin the transceiver.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEW SECTION 3 DISASSEMBLY INSTRUCTIONS SECTION 4 CIRCUIT DESCRIPTION 4 - 1 RECEIVER CIRCUITS ............4 - 1 4 - 2 TRANSMITTER CIRCUITS .

  • Page 4: Specifications

    SECTION 1 SPECIFICATIONS ‘ ‘ GENERAL • Frequency range : 476.425 MHz–477.400 MHz [CB] 450 MHz–500 MHz [Private] • Number of conventional channels : 40 channels (Include in 1 bank) [CB] 88 channels (Include in 2–8 bank) [Private] • Type of emission : Wide (16K0F3E) (25 kHz;...

  • Page 5: Inside View

    SECTION 2 INSIDE VIEW Final FET module (IC3 : RA30H4452M-21) Antenna switch/ CPU 5V regulator* Low-pass filter circuit (IC10: AN78L05M) 8V regulator 1st Mixer* (IC9: TA7808F) (Q3: 3SK299) 2nd IF filter* (FI2: ALFYM450F=K) VCO circuit D/A converter* (IC6: M62363FP-650C) AF amplifier (IC8: LA4425A) Reference crystal oscillator* IF IC...

  • Page 6: Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS • Opening case and removing the front unit Unscrew 8 screws F. Unscrew 4 screws A, and remove the bottom cover. Remove the filter case G. Disconnect the flat cable B from J2. Unscrew the screw H. Disconnect the cable C from J7.

  • Page 7: Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-3 1ST MIXER AND 1ST IF CIRCUITS (MAIN UNIT) 4-1-1 ANTENNA SWITCHING CIRCUIT The 1st mixer circuit converts the received signals to a fixed (MAIN UNIT) frequency of the 1st IF signal with the PLL output frequency. The antenna switching circuit functions as a low-pass filter By changing the PLL frequency, only the desired frequency while receiving and as resonator circuit while transmitting.

  • Page 8: Transmitter Circuits

    4-1-5 AF AMPLIFIER CIRCUIT (MAIN UNIT) 4-2 TRANSMITTER CIRCUITS The AF amplifier circuit amplifies the demodulated AF sig- 4-2-1 MICROPHONE AMPLIFIER CIRCUIT nals to drive a speaker. (MAIN AND FRONT UNITS) The microphone amplifier circuit amplifies audio signals The AF signals from the FM IF IC (IC1, pin 9) are applied to within +6 dB/octave pre-emphasis characteristics from the the active filter circuit (IC16).

  • Page 9: Pll Circuits

    4-2-4 POWER AMPLIFIER CIRCUIT (MAIN UNIT) 4-3 PLL CIRCUITS The power amplifier circuit amplifies the driver signal to an 4-3-1 PLL CIRCUIT (MAIN UNIT) output power level. A PLL circuit provides stable oscillation of the transmit fre- quency and receive 1st LO frequency. The PLL output com- The RF signal from the drive amplifier (Q8) is passed pares the phase of the divided VCO frequency to the refer- through the low-pass filter circuit (L18, L43, C89, C90, C92,...

  • Page 10: Power Supply Circuits

    4-4 POWER SUPPLY CIRCUITS 4-5 PORT ALLOCATIONS 4-4-1 VOLTAGE LINES (MAIN UNIT) 4-5-1 CPU (FRONT UNIT; IC1) Port Line Description Description number name The voltage from a DC power supply. TEMP Input port for the internal temperature. The same voltage as the HV line which is con- Input port for the low voltage detection trolled by the power switching circuit (Q23, Q24).
  • Page 11 CPU-Continued 4-5-2 OUTPUT EXPANDER (MAIN UNIT; IC17) Port Port Description Description number name number name I/O ports for the optional board control Outputs transmit/receive control signal. OPT3– 44–46 OPT1 signals. High: While receiving. Outputs audio output control signal. Input port for the clock signal from the AFON High: While receiving.

  • Page 12: Adjustment Procedures

    • At least 16 MB RAM and 10 MB of hard disk space I STARTING SOFTWARE ADJUSTMENT • 640×480 pixel display (800×600 pixel display recommend- q Connect IC-400PRO and PC with *OPC-1122 JIG CABLE w Turn the transceiver power ON.
  • Page 13 I REQUIRED TEST EQUIPMENT EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RANGE Output voltage : 13.8 V DC Frequency range : 300–3000 Hz DC power supply Audio generator Current capacity : 10 A or more Measuring range : 1–500 mV Measuring range : 1–50 W Frequency range...
  • Page 14 • SCREEN DISPLAY EXAMPLE CS-400PRO ADJ Rev.1.0 File Option COM 1: OPEN Connect Reload (F5) Disp para [A / D] [D / A] : 178 : B2h : 19.96 V BPF T1 : 197 : 32h : 0.98 V TEMPS : 177 : B1h : 26.44 ’C T2/POW : 172 : 32h : 0.98 V LVIN...

  • Page 15: Pll Adjustment

    5-2 PLL ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK • Operating freq. : 450.000 MHz MAIN Connect a digital multi- 1.0 V MAIN C133 VOLTAGE • Receiving meter or an oscillo- scope to the check point, “LV”.

  • Page 16: Software Adjustment

    5-3 SOFTWARE ADJUSTMENT Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION REFERENCE • Operating freq. : 500.000 MHz Rear Loosely couple a frequency 500.0000 MHz FREQUENCY...
  • Page 17 SOFTWARE ADJUSTMENT – continued Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION • Operating freq. : 450.000 MHz MAIN Connect a SINAD meter with a Minimum distortion 4 Ω...

  • Page 18: Trimmer Adjustment

    5-4 TRIMMER ADJUSTMENT • Make this adjustment if necessary (For example, when beep sound is too loud or too soft). • BE CAREFUL!: 5-tone calling beep sound becomes loud or soft when beep volume adjusts to loud or soft. MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS...

  • Page 19: Parts List

    SECTION 6 PARTS LIST [FRONT UNIT] [FRONT UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1140011470 S.IC HD6433687A37FP (FX-2622B) 7030005050 S.RESISTOR ERJ2GEJ 103 X (10 kΩ) 1110005770 S.IC S-80942CNMC-G9C-T2 7030005050 S.RESISTOR ERJ2GEJ 103 X (10 kΩ) 1140008650 S.IC HN58X2464TI 7030005120 S.RESISTOR ERJ2GEJ 102 X (1 kΩ) 1110005340 S.IC NJM12902V-TE1...

  • Page 20: Main Unit

    [FRONT UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 5040002310 S.LED SML-311YTT86 1790000620 S.DIODE MA77 (TX) 5040002310 S.LED SML-311YTT86 1750000710 S.VARICAP HVC350BTRF 5040002310 S.LED SML-311YTT86 1750000710 S.VARICAP HVC350BTRF 5040002310 S.LED SML-311YTT86 1720000570 S.VARICAP MA368 (TX) 5040002310 S.LED SML-311YTT86 1790001250 S.DIODE MA2S111-(TX) 5040002310 S.LED SML-311YTT86...
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R134 7030003650 S.RESISTOR ERJ3GEYJ 563 V (56 kΩ) ERJ3GEYJ 151 V (150 Ω) 7030003340 S.RESISTOR R135 7030003690 S.RESISTOR ERJ3GEYJ 124 V (120 kΩ) 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R136 7030003560...
  • Page 22 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R267 7030003610 S.RESISTOR ERJ3GEYJ 273 V (27 kΩ) 4030006860 S.CERAMIC C1608 JB 1H 102K-T R268 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) 4030011330 S.CERAMIC C1608 CH 1H 391J-T R269 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) 4030011330 S.CERAMIC C1608 CH 1H 391J-T...
  • Page 23 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C164 4030006860 S.CERAMIC C1608 JB 1H 102K-T C318 4030011600 S.CERAMIC C1608 JB 1E 104K-T C167 4030011600 S.CERAMIC C1608 JB 1E 104K-T C319 4030008920 S.CERAMIC C1608 JB 1H 473K-T C168 4030008920 S.CERAMIC C1608 JB 1H 473K-T C320 4030008910 S.CERAMIC...

  • Page 24: Front Unit

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [ACCESSORIES] REF. ORDER REF. ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6510004880 Connector MR-DS-E 01 0800005780 Microphone HM-100N 8010019060 2601 chassis 8900011780 Cable OPC-1194 8110007820 2601 cover 8900000730 Cable OPC-049 8210019340 2622 front panel 8930060840 2622 keyboard (A) 8010019151...
  • Page 25 MP10 (C) MP15 (C) J1 (C) W2 (M) MP1 (C) MP13 (M) J4 (M) MP1 (M) MP8 (M) MAIN UNIT MP2 (M) MP7 (M) MP13 (C) MP11 (C) MP2 (F) R14 (F) MP4 (M) MP3 (F) MP5 (M) MP9 (C) J1 (F) W1 (F) MP18 (C)
  • Page 26 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSSISTORS AND FET’S • DIODES 2SA1577 T106 Q 2SC3356 T1B R25 2SC4116 BL 2SC4213 B 2SC4215 O DA221 TL DAN222TL DAP222 DSA3A1 HVC350B (Symbol: HQ) (Symbol: R25) (Symbol: LL) (Symbol: AB) (Symbol: QO) (Symbol: K) (Symbol: N) (Symbol: P) (Symbol: Green)
  • Page 27 SECTION 9 BOARD LAYOUTS 9-1 FRONT UNIT • TOP VIEW Microphone 9 - 1...
  • Page 28 • BOTTOM VIEW (FRONT UNIT) to MAIN unit J2 9 - 2...
  • Page 29 9-2 MAIN UNIT • TOP VIEW CHASSIS to DC cable speaker HORN DISC to Optional cable OPC-617 to Optional unit to FRONT unit J2 9 - 3...
  • Page 30 • BOTTOM VIEW (MAIN UNIT) 9 - 4...
  • Page 31 SECTION 10 BLOCK DIAGRAM 400-430 MHz Q15 XP1214 440-490 MHz RX VCO 2SC4116 Q16 DTC144EU 2SK880 2SC4226 D16 HVC350B CR-741 LVIN RIPPLE BUFF D14 1SV307 D2 UM9401F D1, D11 RA30H4452M-21 MB15A02PFV-1 D15 MA77 D5 UM9401F MA728 HVC362 2SC4215 2SC5107 2SC5107 2SC5107 2SC3356 15.3 MHz...
  • Page 32 SECTION 11 VOLTAGE DIAGRAMS 11-1 FRONT UNIT DS11 FRONT UNIT L2-0607TAY 5.0V Explanatory notes R51 100k HANG VOLTAGE LINE TX LINE MA2S111 RX LINE C79 0.1 COM3 SEG22 COM3 COM4 SEG21 COM4 CPU5V SEG20 S-80942CNMC-G9C 5.0V TEMP P86/AN6 P70/SCK3_2 CPU5V SEG19 BATV CPU5V...

  • Page 33: Main Unit

    11-2 MAIN UNIT MAIN UNIT (1) CPU5V CPU5V 5.0V R110 2SC4116 2SK880 120k R220 C161 CR-741 7.0V 100k 100p 3.3k 3.3k R266 OV12 Explanatory notes 2SC4215 C200 C126 OV12 R267 OV12 VOLTAGE LINE TX LINE DAST R268 DAST R210 C113 CIRQ CIRQ 100K...
  • Page 34 MAIN UNIT (2) MEASUREMENT CONDITIONS VOLTMETER Amplitude(Oscilloscope) : 100 MHz Frequency : 465 MHz Transmission : 25 W 6.8V RA30H4452M-21 TX: 6.3V RX: 0V 6.4V AS080340-15N 1 2 3 4 TX: 3.0V C102 C100 C331 RX: 0V 0.5p AS080340-15N UM9401F AS100340-10N AS080340-15N 1SV307...
  • Page 36 S-14003HZ-P2 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan C 2003 Icom Inc.

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