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Icom IC-2710H Service Manual

Dual band fm transceiver
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DUAL BAND
TRANSCEIVER
FM
IC-2710H
lcom Inc.

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Summary of Contents for Icom IC-2710H

  • Page 1 DUAL BAND TRANSCEIVER IC-2710H lcom Inc.
  • Page 2 DO NOT expose the transceiver to rain, snow or any liq­ Europe uids. Italy DO NOT reverse the polarities of the power supply when IC-2710H connecting the transceiver. U.S.A. DO NOT apply an RF signal of more than 20 dBm (100 Australia mW) to the antenna connector.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEW SECTION DISASSEMBLY INSTRUCTIONS SECTION CIRCUIT DESCRIPTION 4- 1 RECEIVER CIRCUITS ........................4 - 1 TRANSMITTER CIRCUITS ......................4 -3 PLL CIRCUITS ..........................4 -4 POWER S UPPLY CIRCUITS ......................4-5 PO RT ALLOCATIONS ........................4 -5 SECTION ADJUSTMENT PROCEDURES 5 - 1...
  • Page 4 SECTION SPECIFICATIONS 430 (440) band band Tx: 144 MHz-148 MHz Frequency U.S.A 440 MHz-4SO MHz Rx: 118 MHz-174 MHz*' coverage Europe 144 MHz-146 MHz 430 MHz-440 MHz S.E. Asia Tx: 144 MHz-148 MHz 430 MHz-440 MHz Rx: 136 MHz-174 MHz*' Italy Tx: 144 MHz-148 MHz Tx: 430 MHz-440 MHz...
  • Page 6 SECTION 3 DISASSEMBLY INSTRUCTIONS •Remove the cover (Fig.3-1) • Remove the speaker (Fig.3-2) ® Disconnect the speaker connector (J3), then lift up the Unscrew the one screw from the bottom cover, then open the cover. clip part of the speaker plate, in the direction of the arrow.

  • Page 7: Section 4 Circuit Description

    SECTION CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 DUPLEXER CIRCUIT The received signals from the VHF RF circuit are mixed with The transceiver has a duplexer (low-pass and high-pass the 1st LO signal (VCO output signal) at the 1st mixer (OS2) fitters) on the first stage from the antenna connector to to produce a 4S.OS MHz 1st IF signal.
  • Page 8 4-1-11 UHF 1ST MIXER AND 1ST IF CIRCUITS 4-1-8 AF AMPLIFIER CIRCUIT The amplified signals from the RF amplifier (086) are mixed The AF amplifier circuit amplifies the detected signals to drive a speaker. For the separate speaker function, a with a 1st LO signal at the mixer circuit (087) to produce a stereo power amplifier is used.

  • Page 9: Transmitter Circuits

    4-2 TRANS MITTER CIRCUITS 4-2-5 VHF APC CIRCUIT The APC circuit protects the power module (IC4) and drive 4-2-1 MICROPHONE AMPLIFIER CIRCUIT amplifier (010) from a mismatched output load and The microphone amplifier circuit amplifies audio signals stabilizes transmit output power. from the microphone to a level needed for the modulation circuit.

  • Page 10: Pll Circuits

    4-3-3 UHF PLL CIRCUITS 4-3 PLL CIRCUITS U-UHF LOOP GENERAL 4-3-1 The generated signal at the U-UHF VCO (0123) is A PLL circuit provides stable oscillation of the transmit amplified at the buffer-amplifiers (0122, 0130) and then frequency and the receive local frequen cy.

  • Page 11: Power Supply Circuits

    4-4 POWER SUPPLY CIRCUITS 4-5 PORT ALLOCATIONS 4-4-1 Line Description CPU (MAIN UNIT) VOLTAGE LINES (MAIN UNIT) 4-5-1 Port Description number name The voltage from the external power supply. Input port for the reset circuit (MAIN 13. 8 The same voltage as the HV line (external power unit IC30, 0184, D147).
  • Page 12 CPU (MAIN UNIT) CPU (MAIN UNIT) Port Port Description Description number number name name Input port for tone squelch detector. Input port for differentiated signal "Low" : A matched tone signal is from an optional UT-49. TSO LB received. "High": When a correct DTMF signal is received.

  • Page 13: Section 5 Adjustment Procedures

    ADJUSTMENT PROCEDURES SECTION 5 5-1 PREPARATION BEFORE SERVICING • REQUIRED TEST EQUIPMENT EQUIPMENT GRADE AND RANGE EQU IPMENT GRADE AND RANGE : 13.8 V DC Standard signal Frequency range : 100-470 MHz DC power supply Output voltage : - 1 29 to - 1 7 dBm Current capacity : 20 A or more generator (SSG)

  • Page 14: Pll And Transmitter Adjustments

    5-2 PLL AND TRANSMITTER ADJUSTMENTS MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST •VHF display: 145.000 MHz MAIN Connect a digital 2.3 V MAIN LOCK •Receiving multi-meter or an VOLTAGE oscilloscope to the CP-LW. • UHF display: 145.000 MHz Connect a digital L118 •Receiving...
  • Page 15 VHF output power adjustment UHF output power adjustment C 4 BO P LL reference frequency adjustment P LL lock voltage adjustment PLL lock voltage adjustm e nt R28 9 VHF frequency deviation adjustment UHF frequency deviation adjustment PLL lock voltage check point CP-LW PLL lock voltage...

  • Page 16: Receiver Adjustment

    RECEIVER ADJUSTMENT M EASUR EMENT ADJUSTMENT VALUE ADJUSTMENT ADJUSTMENT CONDITIONS UNIT LOCATION U N IT ADJUST •VHF display: 145.000 MHz MAIN Connect a DC volt Maximum DC MAIN Adjust in • Connect an SSG to the antenna meter to the voltage sequence SENSITIVITY...
  • Page 17 e @D Sensitivity Sensitivity L 50 adjustment adjustment O @D L 70 11 1- '::: ::' (VHF display) (UHF display) II I 0 o�- 0 � Dc:J VHF squelch level adjustment Sensitivity check point (VHF display) Sensitivity check point R 44 0 (UHF display) UHF Squelch level adjustment...

  • Page 18: Section 6 Parts List

    SECTION 6 PARTS LIST 6-1 IC-271 OH [CONTROL UNIT] [CONTROL UNIT] R E F . O R D E R ORDER k Q ) DESCRIPTION DESCRI PTION 1 1 J0007a5o S . I C LC75a2JW 70JOOOJ640 S . R ES ISTOR ERJJGEYJ 47J V (47 1 1 40005520 S .
  • Page 19 [MAIN UN IT] [MAIN U N IT] REF. ORDER REF. ORDER DESCRI PTION DESC R I PTION I C l 1 1 8000 1 070 S . I C TA7805F(TE 1 6 l) 1 580000490 S . FET 3SK1 66-2 -T7 1 1 1 00025 1 0 S .
  • Page 20 [MAIN UNIT] [MAIN UNIT] R E F . ORDER R E F . ORDER DESCRIPTION DESCRI PTION 2SC44 0 S-3 -TL 0 1 99 $ .TRANSISTOR 1 S30002S70 D 1 30 1 750000 1 70 S . DIODE DA 1 1 S T1 07 [EUR].
  • Page 22 [MAIN U N IT] [MAIN U N IT] REF. ORDER REF. ORDER DESCRIPTION DESCRI PTION R 1 92 7030003480 $ . RES ISTOR ERJ3G EYJ 222 V (2.2 k Q ) 7030003320 $ . RES ISTOR ERJ3G EYJ 1 0 1 V (1 00 Q ) R 1 00 7030003440 $ .
  • Page 24 [MAIN UNIT] [MAIN UNIT] REF. ORDER REF. ORDER DESCRI PTION DESCRIPTION $ . R ES ISTO R R453 7030003480 ERJ3G EYJ 222 V 2 . 2 k Q ) R532 7030003440 $ . R ES ISTOR E RJ3G EYJ 1 02 V 1 k Q ) R454 7030003380...
  • Page 25 [MAIN U N IT] [MAIN U N IT] ORDER R E F . O R D E R DESCRI PTION DESC R I PTION N O . R6 1 6 7030003800 S . RES ISTO R ERJ3GEYJ 1 0S V 1 M Q ) 40300070 1 0 S .
  • Page 26 [MAIN UNIT] [MAIN UNIT] REF. ORDER REF. ORDER DESCRI PTION DESCRI PTION C 1 77 4030007090 $ . CERAMIC 608' C H lH 470J-T-A C268 4030007090 S . C ERAMIC C 1 608 C H 1 H 470J-T-A C 1 78 4030009570 S .
  • Page 27 [MAIN UNIT] [MAIN U N IT] R E F . ORDER R E F . ORDER DESCRIPTION DESCRI PTION C365 40300 1 1 1 20 $ . C ERA M I C GRM42-6 C H 1 00D 500PT C477 4030006860 $ .
  • Page 29 [MAIN UNIT] [MAIN U N IT] ORDER R E F . ORDER DESCRI PTION DESCRI PTION N O . C769 4030006860 S . C ERAMIC C 1 608 J B lH 1 02 K-T-A 7030003860 $ . J U M PE R E RJ3 G E J PW V C770 4030006860...
  • Page 30 6-2 H M-98 [MAIN UNIT] [MAIN U N IT] ORDER REF. ORDER DESCRIPTION DESCRI PTION N O . 1 1 40005B70 S . IC µ PD7564AG-555 R3 1 7030003640 S . R ES ISTO R ERJ3G EYJ 473 V (47 k Q ) 1 1 30002370 S .

  • Page 31: Control Unit

    SECTION 7 MECHANICAL PARTS AND DISASSEM B LY 7- 1 CA BINET PARTS REF. R E F. ORDER ORDER DESCRIPTION QTY. DESCRIPTION QTY. [CHASSIS PARTS] [CONTRO L UNIT] SP 1 25 1 0000S20 Speaker VS-57-0S 1 4 DS 4 503000 1 320 LCD HLCS763-0 1 2300 65 1 0004SSO Antenna connector M R-DSE -01...
  • Page 32 Este manual original foi gentilmente cedido para ser digitalizado por PY2TKI Marcos Digitalizado em 23 de Novembro de 2020 por Alexandre "Tabajara" Souza, PU2SEX http://www.tabalabs.com.br http://tabajara-labs.blogspot.com MANUAL DE DISTRIBUIÇÃO GRATUITA - Respeite o meu esforço de preservar a documentacao...

  • Page 33: Main Unit

    HM-98 REM OTE CONTRO MICROPHONE (Ch) MP (Ch) M F (Co) MP /� MAI N U N IT (Ch) SP (Co) MP � � (Co) M P (Ch) MP 5 (Ch) MP ,, �- -� � � � (Ch) MP �...
  • Page 34 S E CTI O N 8 S E M I-CO N D U CTO R I N FO R MATI O N S 8-1 TRANSISTORS 8-2 DIODES SYMBOL SYMBOL SYMBOL SYM BOL NAME INSIDE VIEW NAME INSIDE VIEW NAME INSIDE VIEW NAME INSIDE VIEW 1 SV2 1 7...

  • Page 35: Section 1

    SECTION 9 BOAR D LAYOUTS The combination of this page and the next page shows 9-1 CONTROL U N IT the unit layout in the same configuration as the actual P.C. Board. • CONTROL UNIT (TOP VIEW) VV/M Hz UV/MHz UM/CALL VM/CALL VHF DIAL...
  • Page 36 • CONTROL UNIT (BOTTOM VIEW) UHF DIAL UHF SOL. UHF VOL. VHF VOL. VHF SOL. VHF DIAL � � > C3 C3 a MAIN U N IT 9 - 2...

  • Page 39: Optional Units

    SECTION 1 0 O PTIONAL U N ITS 1 0-1 H M -98 R E MOTE CONTROL M IC R O P H O N E BOARD LAYOUT (TOP VIEW) • 2SC2712 0. 0 01 R 8 BV 8 7V 1.2k 0.001 o.oo,...

  • Page 40: Co Rdless Mic Rophone

    1 0-2 H M -90 C O R D L ESS M I C R O P H O N E A• BOARD LAYOUT • GN02 MAIN UNIT (TOP VIEW) GN01 R39, R42 Deviation (DATA) 455 kHz Reference adjustment frequency adjustment Check point ---+- - BC-96 Audio...
  • Page 41 LOGIC UNIT (TOP VIEW) SWITCH BOARD (TOP VIEW) to MAIN UNIT @.iliTI to MAIN UNIT C O R DLESS M I C RO P H O N E ADJ U STM ENT • PREPARATION Disconnect the Ni-Cd battery (BT 1 ), then connect a DC power supply (2.4 V) with a dummy resistor (1 ill 1 W)) to J1 (LOG IC unit).

  • Page 43: 759 Inf Rared Receiver

    1 0-5 EX-1 759 I N F R A R E D R E C E I V E R BOARD LAYOUT • °" 0.001 TOP VIEW "' R 1 8 RECTANGLE WAVES BUSY adjustment SQU ELCH adjustment adjustment O OV 155353 WGND WMIC...

  • Page 44: Section 1 1

    SECTION 1 1 B LOC K DIAG RAM ---t> RX CR-489 12.8 MHz V VC08V SW ---1> RX!TX 044 DTA1 1 3ZU V PLL 045 2SC4081 - rx 046 2SD1851 EFOS49 14E3 4.91 MHz UPT3140GS IC 3 � DATA BUS TA7808F V MOD MUTE XOUT...
  • Page 47 Phone : (206) 454-8 1 55 learn : 02 1 1 333639 : (206) 454-1 509 Telex : 1 522 1 0 ICOM AMER BVU E (Australia) Pty. Ltd. <Customer Service> Phone : (206) 454-76 1 9 A.C . N 006 092 575 7 Duke Street, Windsor, Victoria, 3 1 8 1 , Australia <...
  • Page 48 A-5382KG·S 1 996 Printed in Singapore lcom Inc. Copyright ©, by lcom Inc. 6-9-16, Kamihigashi, Hirano-ku, Osaka 547, Japan...

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