Icom IC-M88 manuale d’uso

VHF MARINE TRANSCEIVER iC- m88[...]

INTRODUCTION This ser vice manual describes the latest ser vice information f or th e IC-M8 8 VH F MARIN E TRANSCEIVE R at th e tim e o f publication. T o upgrade quality , all electrical or mechanical parts and inter- nal circuits are subject to change without notice or obligation. DANGER NEVER connect the transceiver to an AC outlet or a D C powe[...]

T ABLE OF CONTENTS SECTION 1 SPECIFICA TIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBL Y INSTRUCTIONS SECTION 4 CIRCUIT DESCRIPTION 4 - 1 RECEIVER CIRCUITS ................................................................................................... 4 - 1 4 - 2 TRANSMITTER CIRCUITS ...........................................................[...]

1 - 1  GENERAL • F requency coverage : TX: 156.025–157.425 MHz, RX: 156.050–163.275 MHz [MARINE] TX/RX: 146.000–174.000 MHz [LMR] • Number of free channels : 22 channels • T ype of emission : 16K0G3E (Wide; 25 kHz) [MARINE] 16K0F3E (Wide; 25 kHz), 8K50F3E (Narrow; 12.5 kHz) [LMR] • Antenna connector : SMA (50 Ω) • P ower supply[...]

1 - 2 * 1 Low po wer only , * 2 Momentary high power , * 3 Receive only NO TE: Channels 3, 21, 23, 61, 64, 81, 82 and 83 CANNO T be used by the gener al public in USA w aters.  VHF MARINE CHANNEL LIST WX01 WX02 WX03 WX04 WX05 T r ansmit Receive only Receive only Receive only Receive only Receive only Receive 162.550 162.400 162.475 162.425 162.4[...]

2 - 1 AF mute circuit Q441* : 2SC4116 Q442* : CPH3403 Q443 : CPH3403 Q444 : DTC144EU EEPROM (IC591*: HN58X2416TI) IN/EXT microphone s witch (Q461, Q462: UN911H) Microphone amplifier (IC471: NJM2904V) AF mute (IC481: TC4W66FU) S5V regulator (Q561: 2SA1588) M5V regulator Q551: 2SB1132 Q552: XP6501 Q553: DTC144EU CPU (IC661: µPD780316GC-511-9EB) SECT[...]

3 - 1 SECTION 3 DISASSEMBL Y INSTR UCTIONS 1. Remo ving the chassis panel 2. Remo ving the LOGIC unit. 3. Remo ving the MAIN unit q Remov e nut A . w Unscrew 2 scre ws B (2 × 8 mm, blac k) and 3 screws C (2 × 4 mm, blac k) from the chassis. e Ta ke off the chassis in the direction of the arrow . NO TE :* Tighten the screws in order of a number ( [...]

4 - 1 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT (MAIN UNIT) The antenna s witching circuit functions as a low-pass filter while receiving and as resonator circuit while transmitting. The circuit does not allow transmit signals to enter receiv er circuits. Received signals from the antenna connector pass through the low-pass filter (L131[...]

4 - 2 4-1-5 SQUELCH CIRCUIT (MAIN AND LOGIC UNITS) The noise squelch circuit cuts out AF signals when no RF signals are received. By detecting noise components in the AF signals, the squelch circuit s witches the AF mute switch. A por tion of the AF signals divided by C242 from the FM IF IC (IC231, pin 9) are applied to the D/A conv er ter (IC251, [...]

4 - 3 4-3 PLL CIRCUIT (MAIN UNIT) 4-3-1 GENERAL The PLL circuit provides stab le oscillation of the transmit frequency and receive 1st LO frequency . The PLL output compares the phase of the divided VCO frequency to the ref erence frequency . The PLL output frequency is controlled by the divided r atio (N-data) of a programmab le divider . IC1 is a[...]

4 - 4 4-5 PORT ALLOCA TIONS 4-5-1 CPU (LOGIC UNIT ; IC661) Pin number 1 2 3 4 5 6 7 10 11 12 13 17 27 28 29 30 31 32 33 34 35 36 38 46–48 51–70 75 76 77 78 Po r t name BEEP VSSTB EXSTB D ASTB PLSTB ERXDI ETXDO SD A T A SCLK ESCK ESD A CSIFT WDECV WETIN EXTSV BA TTV TDETV NOISV RSSIV LOINV TEMPV CDECV A TIS COM0– COM2 SEG0– SEG19 Description[...]

4 - 5 4-5-3 D/A CONVERT OR IC (MAIN UNIT ; IC251) Pin number 2 3 10 11 14 15 22 23 Po r t name SQCON MOCON DTCON FRCON T1CON T2CON T3CON T4CON Description Outputs squelch le vel control signal. Outputs modulatin le vel control signal. Outputs DTCS modulation balance control signal. Outputs ref erence frequency le v el control signal. Outputs bandpa[...]

5 - 1 5-1 PREP ARA TION When adjusting IC-M88, optional OPC-966 CLONING CABLE , optional RS-232C CABLE and optional CS-M88 adj ADJUSTMENT SOFTW ARE are required. EQUIPMENT DC power supply RF power meter (terminated type) F requency counter Digital multimeter GRADE AND RANGE Output voltage : 7.2 V DC Current capacity : 3 A or more Measuring range : [...]

5 - 2 + + Audio generator 300 Hz to 3 kHz AC millivoltmeter SP+ SP MICE MIC PTT PTTE Add a jumper wire here OPC-966 (Cloning cable) SINAD meter Speaker (8 ) Audio generator to the antenna connector RF power meter 0.1 10 W/50 Frequency counter Attenuator 40 dB or 50 dB FM deviation meter Standard signal generator 0.1 V to 32 mV ( 127 dBm to 17 dBm) [...]

5 - 3 • SCREEN EXAMPLE CS-M88 ADJ Rev .1.0 File COM 1: OPEN Option Connect Reload (F5) Disp para [A / D] BA TT : 120 : 78h : 7.53 V NOIS : 59 : 3Bh : 1.16 V SD : 44 : 2Ch : 0.86 V L VIN : 1 19 : 77h : 2.33 V TEMPS : 178 : B2h : 26.86 ’C TXDET : 0 : 00h : 0.00 V WET : 255 : FFh : 5.00 V [D / A] FRQCON : 127 : 7Fh : 2.49 V T1/POW : 92 : 5Ch : 1.8[...]

5 - 4 1 2 1 1 2 3 4 1 2 1 2 • Operating channel : center frequency • Receiving • Operating channel : center frequency • Connect the RF power meter or 50 Ω dummy load to the antenna connector . • T r ansmitting • Operating channel : center frequency • Connect the RF power meter or 50 Ω dummy load to the antenna connector . • T r [...]

5 - 5 PLL lock voltage check point LV • MAIN UNIT T OP VIEW[...]

5 - 6 SOFTW ARE ADJUSTMENT – continued • Select an operation using [ ↑ ] / [ ↓ ] k eys , then set specified v alue using [ ← ] / [ → ] ke ys on the connected computer k eyboard. • “SQUELCH LEVEL ADJUSTMENT” must be performed after “RX SENSITIVITY ADJUSTMENT” is finished. • “SQUELCH LEVEL ADJUSTMENT” must be performed whe[...]

[VR UNIT] US=USA, US1=USA−1 S.=Surf ace mount 6 - 1 SECTION 6 P AR TS LIST REF ORDER DESCRIPTION M. H/V N O. N O. LOCA TION M.=Mounted side (T: Mounted on the T op side, B: Mounted on the Bottom side) R801 7210003130 V AR TP76N97N-13F-10KA-2497 W801 8900011900 CBL OPC-1192 W802 8900011910 CBL OPC-1193 [US], [SEA] 8900012031 CBL OPC-1231A [US1] EP[...]

6 - 2 M.=Mounted side (T: Mounted on the T op side, B: Mounted on the Bottom side) R553 7030003600 S.RES ERJ3GEYJ 223 V (22 k Ω ) B 12.4/19.4 R561 7030003560 S.RES ERJ3GEYJ 103 V (10 k Ω ) B 20.1/16.1 R562 7030003520 S.RES ERJ3GEYJ 472 V (4.7 k Ω ) B 22.3/20.1 R571 7030005930 S.RES ERJ3GEYF 334 V (330 k Ω ) B 19.7/33.1 R572 7030008090 S.RES[...]

6 - 3 REF ORDER DESCRIPTION M. H/V N O. N O. LOCA TION M.=Mounted side (T: Mounted on the T op side, B: Mounted on the Bottom side) IC1 1140005990 S.IC MB15A02PFV1-G-BND-ER B 34/35 IC141 1110002750 S.IC T A75S01F (TE85R) B 72.8/22.6 IC231 1110003200 S.IC T A31136FN (EL) B 17.6/11.3 IC251 1190000350 S.IC M62363FP-650C B 6.3/22.6 IC261 1110003800 S.I[...]

[MAIN UNIT] 6 - 4 M.=Mounted side (T: Mounted on the T op side, B: Mounted on the Bottom side) R112 7030003200 S.RES ERJ3GEYJ 100 V (10 Ω ) T 66.9/24.7 R113 7030003520 S.RES ERJ3GEYJ 472 V (4.7 k Ω ) B 68.4/24.8 R114 7030003680 S.RES ERJ3GEYJ 104 V (100 k Ω ) B 66.9/23.5 R121 7030003580 S.RES ERJ3GEYJ 153 V (15 k Ω ) B 67/13.3 R122 70300002[...]

[MAIN UNIT] 6 - 5 REF ORDER DESCRIPTION M. H/V N O. N O. LOCA TION M.=Mounted side (T: Mounted on the T op side, B: Mounted on the Bottom side) C105 4030006860 S.CER C1608 JB 1H 102K-T B 66.9/29 C106 4030006860 S.CER C1608 JB 1H 102K-T T 68.3/30.4 C107 4030007050 S.CER C1608 CH 1H 220J-T T 65.5/27.5 C111 4030007130 S.CER C1608 CH 1H 101J-T T 64.1/2[...]

MC461 7700002630 Microphone SKB-2246T -C33 1 MP441 6910014760 S. plate OG-503040 1 MP451 6910014760 S. plate OG-503040 1 MP462 8930059990 2600 Microphone sponge 1 MP461 8930059810 Microphone rubber 2246 1 MP681 8930058420 2600 LCD holder 1 MP682 82100191 10 2600 Reflector 1 MP683 8930059700 Himelon sheet (CH) 1 DS681 5030002480 LCD L2-0390T A Y 1 E[...]

7 - 2 MP681 (L) W801 (VR) W802 (VR) DS681 (L) MP682 (L) EP681 (L) LOGIC UNIT VR UNIT MAIN UNIT MP53 (C) MP53 (C) MP32 (C) MP33 (C) MP1 (C) MP10 (C) MP8 (C) MP7 (C) MP9 (C) MP71 (C) MP72 (C) MP21 (C) MP41 (M) MP101 (M) MP151 (M) MP42 (C) MP42 (C) MP41 (C) MP44 (C) J41 (C) MP45 (C) MP46 (C) MP41 (C) MP43 (C) MP65 (C) MP66 (C) MP55 (C) (C) : CHASSIS P[...]

7 - 3 13.7V 11.3V 7.1V 7.0V 7.7V 2.3V 0V 5.0V 0V 0V 2.6V Power supply CHARGER UNIT R6 10k R5 3.9k R4 3.9k DS1 TLG124A J1 HEC2305-01-250 R3 10 C4 0.001 D3 DA204K C5 0.001 C6 1 R8 47k D4 MA8330 MP1 MP2 MP3 MP4 R9 2.2k R20 220 D7 MA8051 R7 39k R13 18k OUT VDD VSS CD NC R12 18k C15 0.1 C13 1 D6 DAN202K 1 2 3 1 2 3 4 1 2 3 4 8 7 6 5 1 2 3 4 5 10 9 8 7 6[...]

8 - 1 SECTION P AR TS LIST SECTION 8 SEMI-CONDUCT OR INFORMA TION 8 - 1 TRANSIST ORS AND FETs • MAIN unit and LOGIC unit 8 - 2 DIODES • MAIN unit and LOGIC unit • CHARGER unit • CHARGER unit A C DTC144EU A 1SV307 (TPH3) (Symbol: TX) D AN222TL (Symbol: N-4) HVC350BTRF (Symbol: B0) MA77(TX) (Symbol: 4B) MA8062-M(TX) (Symbol: 6-2) RB706F-40T10[...]

9 - 1 SECTION 9 BO ARD LA Y OUTS 51 0 15 20 25 30 35 40 45 50 55 60 65 70 0 Horizontal 5 10 15 0 25 30 35 20 45 50 55 40 65 60 Vertical 5 10 15 20 25 30 35 40 45 50 55 60 65 70 0 Horizontal 5 10 15 0 25 30 35 20 45 50 55 40 65 60 Vertical 9 - 1 CHARGER UNIT (BC-152) • T OP VIEW • BO TT OM VIEW 1 V OLO W801 W801 R801 W801 GND V OLIN to LOGIC UNI[...]

9 - 2 to VR unit W802 BATTERY CP281 CP282 CP283 CP284 VCC FHV to LOGIC UNIT J401 ANT BEEPO RSSIV NOISV EXSTBO EXOEO VCC VCC WDECV VSSTBO SMICO MICO SCLK O LOINV PLSTBO D ASTBO UNLKI MODIN CDTENC BTYPE CDECV SD ATA O V OLIN TEMPV W/NS TDETV M5V T5VS R5VS V5VS S5V 1 J351 51 0 15 20 25 30 35 40 45 50 55 60 65 70 75 80 0 Horizontal 5 10 15 0 25 30 35 2[...]

9 - 3 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 0 Horizontal 5 10 15 0 25 30 35 20 40 Vertical MAIN UNIT • BO TT OM VIEW The combination of this page and pre vious page shows the unit la yout in the same configuration as the actual P. C. Board.[...]

9 - 4 51 0 15 20 25 30 35 40 45 50 55 60 65 70 0 Horizontal 5 10 15 0 25 30 35 20 45 50 40 Vertical • T OP VIEW 9-5 LOGIC UNIT The combination of this page and ne xt page shows the unit la yout in the same configur ation as the actual P .C. Board.[...]

9 - 5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 0 Horizontal 5 10 15 0 25 30 35 20 45 50 40 Vertical to MAIN UNIT J351 BEEPO RSSIV NOISV EXSTBO EXOEO VCC VCC WDECV VSSTBO SMICO MICO SCLK O LOINV PLSTBO D ASTBO UNLKI MODIN CDTENC BTYPE CDECV SD ATA O V OLIN TEMPV W/NS TDETV M5V T5VS R5VS V5VS S5V J401 1 GND V OLO V OLIN to VR UNIT J411 to CONNECT UNI[...]

10 -1 SECTION 10 BLOCK DIA GRAM PLL IC FIL LOOP BUFF BUFF BUFF BUFF IF AMP RF AMP DRIVE PRE PWR AMP APC CTRL TX/RX SW ANT SW BPF BPF BPF LPF ANTENNA CR-747 D/A LCD DRIVER D/A BATT LIMIT AMP AF MUTE LPF PWR AMP PWR CTRL POWER SW R801 AF MUTE AF MUTE AF MUTE AF MUTE BPF VCO SW FM MOD BUFF BUFF LPF LPF LPF LPF ✕ 2 BPF CERAMIC F281 FUSE 12 BPF CERAMI[...]

11 - 1 SECTION 11 V OL T A GE DIA GRAM R801 10k-A W801 W801 W801 1 2 3 W802 W802 1 2 1 2 3 FHV VCC VOLIN VOLO GND to LOGIC J411 J281 1 2 F281 ERBFE3R00U CP281 CP282 CP283 CP284 HV HV R323 10k R241 6.8k C242 0.001 R239 220k C7 0.01 R223 150 R6 10k C251 0.01 Q322 2SA1588 IC231 T A31136FN OSCIN 1 OSCOUT 2 MIXOUT 3 VCC 4 IFIN 5 DEC 6 FILOUT 7 FILIN 8 A[...]

11 - 2 DO2 DA5V IC251 M62363FP-650C VIN1 1 VOUT1 2 VOUT2 3 VIN2 4 VDD 5 LD 6 CLK 7 DI 8 VIN3 9 VOUT3 10 VOUT4 11 VIN4 12 VIN5 13 VOUT5 14 VOUT6 15 VIN6 16 DO 17 VDAREF 18 RESET 19 GND 20 VIN7 21 VOUT7 22 VOUT8 23 VIN8 24 R279 3.3k R280 2.2k C253 0.01 R278 27k C271 47 R31 1 100k R316 180k R314 82k R293 68k R317 1.5k R292 68k C312 0.022 C315 0.1 C314[...]

11 - 3 EXTSV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 BEEPO RSSIV NOISV EXSTBO EXOEO VCC VCC WDECV VSSTBO SMICO MICO SCLKO LOINV PLSTBO UNLKI MODIN BTYPE CDECV VOLIN TEMPV W/NS TDETV M5V T5VS R5VS V5VS S5V C522 0.022 R511 27k R433 2.2k C411 0.47 R432 1M R494 100k C683 0.47 C591 0.01 C6[...]

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