Icom IC-E208 Service Manual
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Icom IC-E208 Service Manual

Icom IC-E208 Service Manual

Vhf/uhf fm transceiver
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SERVICE
MANUAL
VHF/UHF FM TRANSCEIVER
iE208

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Summary of Contents for Icom IC-E208

  • Page 1 SERVICE MANUAL VHF/UHF FM TRANSCEIVER iE208...
  • 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-E208 VHF/UHF FM TRANSCEIVER at the time at 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 VIEWS 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 VERSION RX (MHz) TX (MHz) 118.000–173.995* , 230.000–549.995* 144.000–146.000, 430.000–440.000 [EUR] 810.000–999.990* [EUR-1] 144.000–146.000, 430.000–440.000 144.000–146.000* , 430.000–440.000 118–173.995* , 230.000–549.995* 144.000–146.000, 430.000–434.000, [ITA] 810.000–999.990* 435.000–438.000 Guaranteed 144.000 – 146.000 MHz only, * Guaranteed 144.000 –...

  • Page 5: Inside Views

    SECTION 2 INSIDE VIEWS • CONTROL UNIT (TOP VIEW) LCD back light LCD back light (DS22: CV1074) (DS22: CV1074) Key back light Key back lights DS13-DS18,DS20: SML512MW DS13-DS18, DS20: SML512MW DS21: SML-020MYT DS21: SML-020MYT • MAIN UNIT (TOP VIEW) Ceramic band pass filter Ceramic bandpass filter FI1: CFWS450HT FI1: CFWS450HT...
  • Page 6 • CONTROL UNIT (BOTTOM VIEW) Color controller Color controller +8V regurator +8V regulator +5V regurator +5V regulator (Q6,Q7: 2SC4116) (Q6, Q7: 2SC4116) Q1: 2SC4116 Q1: 2SC4116 IC5: TA78L05F IC5: TA78L05F Q3: 2SA1734 Q3: 2SA1734 D4: MA8062 D4: MA8062 D5: MA8068 D5: MA8068 Control unit CPU Control unit CPU...

  • Page 7: Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS • Removing the MAIN unit Unscrew 8 screws G, and remove the MAIN unit. Unscrew 4 screws A, and remove the cover. Disconnect the cable B from J505, and remove the speaker. Remove 2 sheets c. MAIN UNIT J505 J505...
  • Page 8 • Removing the CONTROL unit Unscrew 2 screws C, and remove the LCD plate. Remove 2 knobs A. Remove the CONTROL unit. CONTROL UNIT Unscrew 2 screws B, and remove the cover. 3 - 2...

  • Page 9: Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS The signals from the antenna swtiching circuit pass through the each attenuator circuit (for VHF is D49 and D50, for UHF 4-1-1 DUPLEXER CIRCUIT (MAIN UNIT) is D46 and D48, for SHF is D39). The transceiver has a duplexer (low-pass and high-pass fil- The D/A converter outputs “ATT”...
  • Page 10 • ABOVE 230 MHz RF CIRCUIT • UHF (430 MHz–440 MHz) 1ST MIXER CIRCUIT (230 MHz–550 MHz, EXCEPT 430 MHZ–440 MHz) The signals from the UHF RF circuit are mixed with the 1st The signals from the attenuator circuit pass through the tun- LO signal at the 1st mixer circuit (Q35) to produce a 46.05 able bandpass filter (D36, L37, L38, C242, C253, C261).
  • Page 11 • IN CASE OF FM SIGNAL RECEIVING When the signal passes through the other low-pass filter The signal is then amplified at the limiter amplifier section (C52, C53, R46, R52), the filtered signal is applied to the (IC5, pin 5) and applied to the FM detector section (X2, IC5, MAIN CPU (IC505, pin 42) via the “WXALT”...

  • Page 12: Transmitter Circuits

    The signal from the AM detector circuit (Q13) is detected at The signals are amplified at the buffer amplifier (IC3C, pins the AGC detector circuit (D19–D21). When receiving strong 9, 8), and are then applied to the D/A converter IC (IC4, pin signals, the detected voltage increases and the AGC voltage 13) to adjust modulation level.
  • Page 13 4-2-3 VHF DRIVE AMPLIFIER CIRCUIT 4-2-5 VHF APC CIRCUIT (MAIN UNIT) (MAIN UNIT) The APC circuit protects the power amplifier from a mis- matched output load and stabilizes transmit output power. The drive amplifier circuit amplifies the VCO oscillating sig- nal to a level needed at the power amplifier.

  • Page 14: Pll Circuits

    4-2-7 UHF DRIVE AMPLIFIER CIRCUIT When antenna impedance is mismatched, the detected volt- age exceeds the reference voltage. The output voltage of (MAIN UNIT) the APC amplifier (IC15, pin 1) controls the bias voltage of The RF signals from the low-pass filter (VCO board) pass the power module (IC14) to reduce the output power via the through the high-pass filter (L69, C119) and attenuator APC controller (IC15, D531).
  • Page 15 4-3-3 UHF LOOP (VCO BOARD AND MAIN UNIT) • WHILE RECEIVING UHF BAND OR 800 MHz BAND The oscillated signal at the U-VCO circuit is amplified at the The generated signal at the U-VCO (Q101, D100, D101) buffer amplifiers (Q102, Q103), and is then applied to the enters the PLL IC (MAIN unit;...

  • Page 16: Other Circuits

    4-4 OTHER CIRCUITS 4-5-2 MAIN UNIT VOLTAGE LINES 4-4-1 SUB-CPU RESET CIRCUIT (CONTROL UNIT) Description Line IC2 is the reset voltage detecting circuit. The output voltage The voltage from the external power supply via from the +5 regulator circuit (IC5) is applied to the VDD ter- the W501 (OPC-465).

  • Page 17: Port Allocations

    (MAIN unit; IC505)–Continued 4-6 PORT ALLOCATIONS 4-6-1 MAIN CPU PORT ALLOCATIONS Port Description number name (MAIN UNIT; IC505) CLONE_IN Input port for the cloning signal. Port Outputs the data signal to the D/A Description number name DA_DATA CONVERTER (IC11, pin 17). Outputs the transmit mute signal.
  • Page 18 (MAIN unit; IC505)–Continued 4-6-3 FRONT CPU PORT ALLOCATIONS (CONTROL UNIT; IC6) Port Description number name Port Description Outputs the VCO circuit select signal. number name VCO_SHIFT High : The VCO circuit oscillates Input port for the [BAND] key. BAND 203.95–263.945 MHz signal. Low : The [BAND] key is pushed.

  • Page 19: Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION Need to enter the adjustment mode, and the JIG cable as shown the page 5-2 is required when adjusting the IC-E208. I REQUIRED TEST EQUIPMENT EQUIPMENT GREDE AND RANGE EQUIPMENT GREDE AND RENGE Output voltage : 13.8 V DC...
  • Page 20 ‘ ‘ CONNECTIONS FM DEVIATION ATTENUATOR METER 50 dB or 60 dB RF POWER METER POWER SUPPLY 50 , 1 80 W 13.8 V, 20 A or more STANDARD SIGNAL GENERATOR 0.1 300 MHz 127 to 17 dBm (0.1 V to 32 mV) CAUTION! DO NOT transmit while an SSG is...

  • Page 21: Software Adjustments

    5-2 SOFTWARE ADJUSTMENT (TRANSMITTING) ADJUSTMENT ADJUSTMENT CONDITION OPERATION REFERENCE • Operating frequency : 435.0 MHz • Turn the [DIAL] to set to 435.0000 MHz. FREQUENCY • Loosely couple a frequency counter to the antenna • Push the [BAND] key. [Fr] connector on the rear panel.
  • Page 22 SOFTWARE ADJUSTMENT (TRANSMITTING AND RECEIVING)–Continued ADJUSTMENT ADJUSTMENT CONDITION OPERATION FREQUENCY • Operating frequency : 144.0 MHz • Turn the [DIAL] to set to ±4.6 kHz. DEVIATION • Connect an audio generator to the [MIC] jack and set • Push the [BAND] key. (VHF band) : +20 dB [DE]...
  • Page 23 SOFTWARE ADJUSTMENT (RECEIVING)–Continued ADJUSTMENT ADJUSTMENT CONDITION OPERATION TRACKING • Operating frequency : 400.1 MHz • Push the [BAND] key. (Middle2 • Connect an SSG to the antenna connector and set as band) Level : 1 µV* (–107 dBm) [Tr] Modulation : 1 kHz Deviation : ±...
  • Page 24 SOFTWARE ADJUSTMENT (RECEIVING)–Continued ADJUSTMENT ADJUSTMENT CONDITION OPERATION TEMP. • Operating frequency : 435.0 MHz •Turn the [DIAL] to set to “F9” on the display. CORRECTION • Receiving • Push the [BAND] key. <High power> (UHF –10˚C) [HP–] (UHF +60˚C) • Operating frequency : 435.0 MHz •Turn the [DIAL] to set to “07”...
  • Page 25 SOFTWARE ADJUSTMENT (RECEIVING)–Continued ADJUSTMENT ADJUSTMENT CONDITION OPERATION SQUELCH • Operating frequency : 145.12 MHz • Push the [BAND] key. LEVEL • Connect an SSG to the antenna connector and set as (Wide) Level : 0.079 µV* (–129 dBm) [SqW] Modulation : 1 kHz Deviation : ±...

  • Page 26: Parts List

    SECTION 6 PARTS LIST [CONTROL UNIT] [CONTROL UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1110005780 S.IC S-80945CLMC-G7F-T2 6510023680 CONNECTOR 2633 FRONT CONNECTOR 1180000420 S.IC TA78L05F (TE12R) 1140011370 S.IC HD6433842RB36H (FX2633D)B 5030002580 LCD L2-0736TAY DS13 5040002930 S.LED SML-512MW T86P 1530002690 S.TRANSISTOR 2SC4116-GR (TE85R) DS14 5040002930 S.LED SML-512MW T86P...
  • Page 27 [VCO UNIT] [VCO UNIT] ORDER ORDER DESCRIPTION DESCRIPTION ERJ3GEYJ 390 V (39 Ω) D106 1790001620 S.DIODE 1SV308 (TPL3) R122 7030003270 S.RESISTOR D107 1790001260 S.DIODE MA2S077-(TX) R123 7030003730 S.RESISTOR ERJ3GEYJ 274 V (270 kΩ) R124 7030003520 S.RESISTOR ERJ3GEYJ 472 V (4.7 kΩ) ERJ3GEYJ 470 V (47 Ω) R125 7030003280 S.RESISTOR...

  • Page 28: Main Unit

    [VCO UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C126 4030006950 S.CERAMIC C1608 CH 1H 040C-T 1590003240 S.TRANSISTOR UN9114J-(TX) C127 4030009520 S.CERAMIC C1608 CH 1H 020B-T 1590003260 S.TRANSISTOR UN911NJ-(TX) C128 4030007130 S.CERAMIC C1608 CH 1H 101J-T 1590003240 S.TRANSISTOR UN9114J-(TX) C129 4030009510 S.CERAMIC C1608 CH 1H 010B-T 1590003240 S.TRANSISTOR UN9114J-(TX) C130...
  • Page 29 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1790001620 S.DIODE 1SV308 (TPL3) 6200006980 S.COIL ELJRE R10G-F 1750000510 S.DIODE UM9401F 6200010130 S.COIL LQW18AN6N8C00 1750000940 S.DIODE ISS400 TE61 6200010130 S.COIL LQW18AN6N8C00 1750000940 S.DIODE ISS400 TE61 6200005590 S.COIL ELJRE 2N7Z-F 1710000870 S.DIODE HVU131TRF 6200010330 S.COIL C2012C-R18G 1710000870 S.DIODE...
  • Page 30 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION ERJ3GEYJ 271 V (270 Ω) 7030003660 S.RESISTOR ERJ3GEYJ 683 V (68 kΩ) R132 7030003370 S.RESISTOR ERJ3GEYJ 390 V (39 Ω) 7030003780 S.RESISTOR ERJ3GEYJ 684 V (680 kΩ) R133 7030003270 S.RESISTOR ERJ3GEYJ 151 V (150 Ω) 7030003660 S.RESISTOR ERJ3GEYJ 683 V (68 kΩ) R134...
  • Page 31 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R224 7030003600 S.RESISTOR ERJ3GEYJ 223 V (22 kΩ) R547 7030003590 S.RESISTOR ERJ3GEYJ 183 V (18 kΩ) R225 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) R548 7030003700 S.RESISTOR ERJ3GEYJ 154 V (150 kΩ) R226 7030003620 S.RESISTOR ERJ3GEYJ 333 V (33 kΩ)
  • Page 32 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R637 7030003730 S.RESISTOR ERJ3GEYJ 274 V (270 kΩ) 4550003220 S.TANTALUM TEMSVA 1E 105M-8L R638 7030003730 S.RESISTOR ERJ3GEYJ 274 V (270 kΩ) 4550000550 S.TANTALUM TESVA 1V 224M1-8L R639 7030003720 S.RESISTOR ERJ3GEYJ 224 V (220 kΩ) 4550000550 S.TANTALUM TESVA 1V 224M1-8L ERJ3GEYJ 221 V (220 Ω)
  • Page 33 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C163 4030009520 S.CERAMIC C1608 CH 1H 020B-T C250 4030008680 S.CERAMIC C2012 JF 1C 105Z-T C164 4030007040 S.CERAMIC C1608 CH 1H 180J-T C251 4030006860 S.CERAMIC C1608 JB 1H 102K-T C165 4030006860 S.CERAMIC C1608 JB 1H 102K-T C252 4030006900 S.CERAMIC C1608 JB 1H 103K-T...
  • Page 34 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C529 4510007310 S.ELECTROLYTIC 16 CV 10 BS C621 4030006860 S.CERAMIC C1608 JB 1H 102K-T C531 4550006210 S.TANTALUM ECST1CX106R C623 4030006860 S.CERAMIC C1608 JB 1H 102K-T C532 4550006210 S.TANTALUM ECST1CX106R C624 4030006860 S.CERAMIC C1608 JB 1H 102K-T C533 4030008910 S.CERAMIC...
  • Page 35 [MAIN UNIT] ORDER DESCRIPTION W524 7030003860 S.JUMPER ERJ3GE JPW V W525 7030003860 S.JUMPER ERJ3GE JPW V W526 7030003860 S.JUMPER ERJ3GE JPW V W527 7030003860 S.JUMPER ERJ3GE JPW V W528 7030003860 S.JUMPER ERJ3GE JPW V W529 7030003860 S.JUMPER ERJ3GE JPW V W530 7030003860 S.JUMPER ERJ3GE JPW V...
  • Page 36 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PART] [MAIN UNIT] REF. ORDER REF. ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6510004880 Connector MR-DS-E 01 J502 6510023110 Connector 3008L-8P8C J503 6510019321 1729 rear connector-1 2510001160 Speaker 057P0802 J504 6510023160 Connector DN-508B-6 2710000760 Fan FD1240107B-1N J506 6510023590 Connector HSJ2000-01-010...
  • Page 37 J1 (C) MP6 (C) MP11 (C) MP1 (C) MP17 (C) MP4 (C) MP10 (C) MP3 (C) MP12 (C) MF1(C) MP2 (CT) MP21(C) CONTROL UNIT MP25 (CT) MP26 (CT) MP1 (M) DS22 (CT) MP19 (C) MP20 (C) MP10 (M) MP18 (CT) MP8 (M) MP21 (CT)
  • Page 38 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTORS AND FET’S • DIODES 2SA1362 GR 2SA1586 GR 2SA1588 GR 2SA1734 2SB1182 TL Q 1SS355 1SS362 1SS400 1SV286 1SV305 (Symbol: AEG) (Symbol: SG) (Symbol: ZG) (Symbol: LB) (Symbol: None) (Symbol: A) (Symbol: C3) (Symbol: A) (Symbol: T7) (Symbol: TV) 2SC2954 T1...
  • Page 39 SECTION 9 BOARD LAYOUTS 9-1 CONTROL UNIT • TOP VIEW LOCK BAND S.MW V/MHz M/CALL TONE MONI SCAN PRIO T-SCAN DTMF 9 - 1...
  • Page 40 • BOTTOM VIEW (CONTROL UNIT) to MAIN unit J503 9 - 2...
  • Page 41 9-2 MAIN UNIT • TOP VIEW J504 AFOUT PTTP DATAIN J502 MICIN PSQL DATAOUT MICE EXTMIC MICU/D J505 to Microphone to Speaker to VCO board J1 CHASSIS W501 BLACK to FAN to VCO board J2 J503 CTHV TXDATA RDATA to CONTROL unit CHASSIS 9 - 3...
  • Page 42 • BOTTOM VIEW (MAIN UNIT) IC13 IC14 9 - 4...

  • Page 43: Vco Board

    9-3 VCO BOARD • TOP VIEW * Mounted R127 in place of W1 ([USA], [E208] only) 9 - 5...
  • Page 44 • BOTTOM VIEW (VCO BOARD) V_LV V_VCO8 V_TXLO VCO_SHIFT V_RXLO U_LV U_TXLO U_RXLO MMUTE U_VCO8 800R5 PLLOUT to MAIN unit to MAIN unit *Mounted R128 in place of W2 ([USA], [E208] only) 9 - 6...

  • Page 45: Block Diagram

    D521,D522 1SS400 CTHV COMMON LINE XP4601 XP4601 CTRL D507 [EUR],[TPE],[EXP],[EUR-1] TXDATA TDATA DATA BUS LINE D508 [TPE],[KOR],[AUS] BUFF RDATA RDATA BUFF D509 [IC-E208] EVU-F2AF20B55 D510 [ITR],[TPE],[KOR] D511-514,D516-D519 [TPE],[KOR],[EUR-1] TXDATA HD6433842RB36H CPU5V D521,D522 except [EXP] RXDATA X1 EF0S4914E3 10 - 1...

  • Page 46: Voltage Diagrams

    SECTION 11 VOLTAGE DIAGRAMS 11-1 CONTROL UNIT DS1 L2-0736TAY JRS0000-1401 DIAL-A DIAL-B 0.0047 R24 4.7k R25 10k SEG34 SEG8 P91/SEG34 P57/WKP7/SEG8 0.0047 SEG35 SEG7 P92/SEG35 P56/WKP6/SEG7 SEG36 SEG6 P93/SEG36 P55/WKP5/SEG6 SEG5 P94/SEG37/M P54/WKP4/SEG5 SEG4 S3-S11 P95/SEG38/DO P53/WKP3/SEG4 SKQDPA SEG3 P96/SEG39/CL2 P52/WKP2/SEG3 SEG2 P97/SEG40/CL1...

  • Page 47: Main Unit

    D522 R545 R521 IC510 MATORIX_IN4 J505 LA4425A R593 D507 1SS400 [EUR],[TPE],[EXP],[EUR-1] AF_MUTE Q512 D508 1SS400 [TPE],[KOR],[AUS] CHASSIS 2SC4213 D509 1SS400 [IC-E208] D510 1SS400 [ITR],[TPE],[KOR] D511-D514,D516-D519 IC502 R505 1SS400 [TPE],[KOR],[EUR-1] S-80945CLMC-G7F IC508 4.7k D521,D522 1SS400 except [EXP] M62429FP J506 VIN1 VIN2...
  • Page 48 MAIN UNIT (2) BUS LINE1 BUS LINE1 HV_I HV_I HV_I HV_I HV_I 5VS_W 5VS_W 5VS_W 5VS_W 5VS_W 1SV308 V_TXLO V_TXLO V_LV V_LV V_RXLO V_RXLO V_VCO8 V_VCO8 0.001 VCO_SHIFT VCO_SHIFT 7.1V U_TXLO U_TXLO U_LV U_LV U_RXLO U_RXLO 100k 0.5p MA2S077 MMUTE MMUTE MMUTE 800R5...
  • Page 49 MAIN UNIT (3) BUS LINE1 BUS LINE1 HV_I HV_I HV_I HV_I HV_I 5VS_W 5VS_W 5VS_W 5VS_W 5VS_W R109 IC10 180k 0.01 TC4W53FU CFWS450HT TC4W53FU EP526 0.001 0.82µ 0.22µ 2SC4116 2SC4215 CFWM450E 100k 1.5k 470k XP4601 0.001 5VS_W 1.2k 100k R120 R119 DTCS_IN 470p...
  • Page 50 MAIN UNIT (4) BUS LINE1 HV_I 5VS_W 5VS_W 5VS_W 5VS_W W529 W531 W533 W535 W537 W539 W541 W543 V_RXLO W530 W532 W534 W536 W538 W540 W542 RX: 4.3V TX: 0V R199 R147 RX: 3.9V Q515 Q516 TX: 0V W544 W545 C2012C-68NG DAN222 UNR9114J...
  • Page 52 S-14001HZ-C2 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan C 2003 Icom Inc.

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