Icom VHF Marine Transceiver IC-M88 Bedienungsanleitung

VHF MARINE TRANSCEIVERiC- m88

4 - 34-3 PLL CIRCUIT (MAIN UNIT)4-3-1 GENERALThe PLL circuit provides stable oscillation of the transmit frequency and receive 1st LO frequency. The P

4 - 44-5 PORT ALLOCATIONS4-5-1 CPU (LOGIC UNIT; IC661)Pin number12345671011121317272829303132333435363846–4851–7075767778Port nameBEEPVSSTBEXSTBDASTBP

4 - 54-5-3 D/A CONVERTOR IC (MAIN UNIT; IC251)Pin number23101114152223Port nameSQCONMOCONDTCONFRCONT1CONT2CONT3CONT4CONDescriptionOutputs squelch leve

5 - 15-1 PREPARATIONWhen adjusting IC-M88, optional OPC-966 CLONING CABLE, optional RS-232C CABLE and optional CS-M88 adj ADJUSTMENT SOFTWARE are requ

5 - 2++Audio generator300 Hz to 3 kHzACmillivoltmeterSP+SPMICEMICPTTPTTEAdd a jumper wire here OPC-966(Cloning cable)SINAD meterSpeaker (8 )Audio ge

5 - 3• SCREEN EXAMPLECS-M88 ADJ Rev.1.0FileCOM 1: OPENOptionConnectReload (F5) Disp para [A / D]BATT : 120 : 78h : 7.53 VNOIS : 59 : 3Bh : 1.16 VSD :

5 - 412112341212• Operating channel : center frequency• Receiving• Operating channel : center frequency• Connect the RF power meter or 50 Ω dummy l

5 - 5PLL lock voltage check pointLV• MAIN UNIT TOP VIEW

5 - 6SOFTWARE ADJUSTMENT – continued• Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected compute

[VR UNIT]US=USA, US1=USA−1 S.=Surface mount6 - 1SECTION 6 PARTS LIST REF ORDER DESCRI

INTRODUCTIONThis service manual describes the latest service information for the IC-M88 VHF MARINE TRANSCEIVE R at the time of publication.To upgrade

6 - 2M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side)R553 7030003600 S.RES ERJ3GEYJ 223 V (22 kΩ) B 12.4/19.4R561 7030

6 - 3 REF ORDER DESCRIPTION M. H/V NO. NO. LOCATIONM.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side)IC1 1140005990 S.I

[MAIN UNIT]6 - 4M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side)R112 7030003200 S.RES ERJ3GEYJ 100 V (10 Ω) T 66.9/24.

[MAIN UNIT]6 - 5 REF ORDER DESCRIPTION M. H/V NO. NO. LOCATIONM.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side)C105 4

MC461 7700002630 Microphone SKB-2246T-C33 1MP441 6910014760 S. plate OG-503040 1MP451 6910014760 S. plate OG-503040 1MP462 8930059990 2600 Microphone

7 - 2MP681 (L)W801 (VR)W802 (VR)DS681 (L)MP682 (L)EP681 (L)LOGIC UNITVR UNITMAIN UNITMP53 (C)MP53 (C)MP32 (C)MP33 (C)MP1 (C)MP10 (C)MP8 (C)MP7 (C)MP9

7 - 313.7V11.3V7.1V 7.0V7.7V2.3V0V5.0V0V0V2.6VPower supplyCHARGER UNITR610kR53.9kR43.9kDS1TLG124AJ1HEC2305-01-250R310C40.001D3DA204KC50.001C61R847kD4M

8 - 1SECTION PARTS LISTSECTION 8 SEMI-CONDUCTOR INFORMATION8 - 1 TRANSISTORS AND FETs• MAIN unit and LOGIC unit8 - 2 DIODES• MAIN unit and LOGIC uni

9 - 1SECTION 9 BOARD LAYOUTS51015 20 25 30 35 40 45 50 55 60 65 700Horizontal51015025303520455055406560Vertical510152025303540455055606570 0Horizontal

9 - 2to VR unitW802BATTERYCP281CP282CP283CP284VCCFHVto LOGIC UNITJ401ANTBEEPORSSIVNOISVEXSTBOEXOEOVCCVCCWDECVVSSTBOSMICOMICOSCLKOLOINVPLSTBODASTBOUNLK

TABLE OF CONTENTSSECTION 1 SPECIFICATIONSSECTION 2 INSIDE VIEWSSECTION 3 DISASSEMBLY INSTRUCTIONS SECTION 4 CIRCUIT DESCRIPTION4 - 1 RECEIVER CIRCUI

9 - 35101520253035404550556065707580 0Horizontal5101502530352040VerticalMAIN UNIT• BOTTOM VIEWThe combination of this page and previous page showsthe

9 - 451015 20 25 30 35 40 45 50 55 60 65 700Horizontal51015025303520455040Vertical• TOP VIEW9-5 LOGIC UNITThe combination of this page and next page s

9 - 5510152025303540455055606570 0Horizontal51015025303520455040Verticalto MAINUNITJ351BEEPORSSIVNOISVEXSTBOEXOEOVCCVCCWDECVVSSTBOSMICOMICOSCLKOLOINVP

10 -1SECTION 10 BLOCK DIAGRAMPLLICFILLOOPBUFFBUFFBUFFBUFFIFAMPRFAMPDRIVEPREPWRAMPAPCCTRLTX/RXSWANTSWBPFBPFBPFLPFANTENNACR-747D/ALCDDRIVERD/ABATTLIMITA

11 - 1SECTION 11 VOLTAGE DIAGRAMR80110k-AW801W801W801123W802W80212123FHVVCCVOLINVOLOGNDto LOGIC J411J28112F281ERBFE3R00UCP281CP282CP283CP284HVHVR32310

11 - 2DO2DA5VIC251 M62363FP-650CVIN11VOUT12VOUT23VIN24VDD5LD6CLK7DI8VIN39VOUT310VOUT411VIN412VIN513VOUT514VOUT615VIN616DO17VDAREF18RESET19GND20VIN721V

11 - 3EXTSV1234567891011121314151617181920212223242526272829303132333435363738BEEPORSSIVNOISVEXSTBOEXOEOVCCVCCWDECVVSSTBOSMICOMICOSCLKOLOINVPLSTBOUNLK

Asia Icom Inc.6F No.68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C.Phone : +886 (02) 2559 1899 Fax : +886 (02) 2559 1874URL : http://www.asia-icom.c

S-13909MZ-C2-q© 2002–2004 Icom Inc.1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan

1 - 1GENERAL • Frequency coverage : TX: 156.025–157.425 MHz, RX: 156.050–163.275 MHz [MARINE]TX/RX: 146.000–174.000 MHz [LMR] • Number of fr

1 - 2*1 Low power only, *2 Momentary high power, *3 Receive onlyNOTE: Channels 3, 21, 23, 61, 64, 81, 82 and 83 CANNOT be used by the general public i

2 - 1AF mute circuit Q441* : 2SC4116 Q442* : CPH3403 Q443 : CPH3403 Q444 : DTC144EUEEPROM(IC591*: HN58X2416TI)IN/EXT microphone switch(Q461, Q462: UN9

3 - 1SECTION 3 DISASSEMBLY INSTRUCTIONS1. Removing the chassis panel2. Removing the LOGIC unit. 3. Removing the MAIN unitq Remove nut A.w Unscrew 2 sc

4 - 14-1 RECEIVER CIRCUITS4-1-1 ANTENNA SWITCHING CIRCUIT(MAIN UNIT)The antenna switching circuit functions as a low-pass filter while receiving and

4 - 24-1-5 SQUELCH CIRCUIT (MAIN AND LOGIC UNITS)The noise squelch circuit cuts out AF signals when no RF signals are received. By detecting noi