VHF MARINE TRANSCEIVER iC- m88
INTRODUCTION This service manual describes the latest service information for the IC-M88 VHF MARINE TRANSCEIVE R at the time of publication. Model Version IC-M88 Symbol FM I / S Battery pack USA NO BP-227 USA-1 YES BP-227FM SEA NO BP-227 U.S.A. S.E. Asia To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or obligation. DANGER NEVER connect the transceiver to an AC outlet or a DC power supply that uses more than 8.3 V.
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 ............................................................................................ 4 - 2 4-3 PLL CIRCUITS....................................................................................................
SECTION 1 SPECIFICATIONS GENERAL • Frequency coverage : TX: 156.025–157.425 MHz, RX: 156.050–163.275 MHz TX/RX: 146.000–174.000 MHz • Number of free channels : 22 channels • Type of emission : 16K0G3E (Wide; 25 kHz) 16K0F3E (Wide; 25 kHz), 8K50F3E (Narrow; 12.5 kHz) • Antenna connector : SMA (50 Ω) • Power supply requirement : BP-227/FM (7.2 V DC, negative ground) • Current drain (approx.) : Transmit Receive • Usable temperature range at at at at at High (5.0 W) Middle (3.0 W) Low1 (1.
VHF MARINE CHANNEL LIST Channel No. USA INT CAN Channel No. USA INT CAN 156.050 160.650 21A 01 01 156.050 156.050 02 02 156.100 160.700 03 03 156.150 160.750 156.150 156.150 23A 156.200 160.800 24 24 156.200 156.200 25 25 156.250 160.850 26 05A 156.250 156.250 06 156.300 156.300 156.350 160.950 07A 156.350 156.350 61 01A 03A 04 04A 05 05A 06 06 Frequency (MHz) Transmit Receive 07 07A 08 08 08 156.400 156.400 09 09 09 156.450 156.450 10 10 10 156.
SECTION 2 INSIDE VIEWS • LOGIC UNIT Bottom view *: Located in another side of this point.
SECTION 3 DISASSEMBLY INSTRUCTIONS 1. Removing the chassis panel q Remove nut A. w Unscrew 2 screws B (2 × 8 mm, black) and 3 screws (2 × 4 mm, black) from the chassis. e Take off the chassis in the direction of the arrow. C C B y e NOTE: * Tighten the screws in order of a number (q–y) when assembling. C r w q A Chassis C t 2. Removing the LOGIC unit. 3.
SECTION 4 CIRCUIT DESCRIPTION The 1st IF signal is applied to a 2nd mixer section of the FM IF IC (IC231, pin 16). The signal is then mixed with a 2nd LO signal for conversion into a 450 kHz 2nd IF signal. 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT (MAIN UNIT) The antenna switching circuit functions as a low-pass filter while receiving and as resonator circuit while transmitting. The circuit does not allow transmit signals to enter receiver circuits.
4-1-5 SQUELCH CIRCUIT (MAIN AND LOGIC UNITS) 4-2-2 MODULATION CIRCUIT (MAIN UNIT) The modulation circuit modulates the VCO oscillating signal (RF signal) using the microphone audio signals. 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 switches the AF mute switch.
4-3 PLL CIRCUIT (MAIN UNIT) 4-4 POWER SUPPLY CIRCUITS 4-3-1 GENERAL VOLTAGE LINES The PLL circuit provides stable oscillation of the transmit frequency and receive 1st LO frequency. The PLL output compares the phase of the divided VCO frequency to the reference frequency. The PLL output frequency is controlled by the divided ratio (N-data) of a programmable divider. IC1 is a PLL IC which controls both VCO circuit for TX and RX.
4-5 PORT ALLOCATIONS 4-5-1 CPU (LOGIC UNIT; IC661) Pin number Port name 1 BEEP Description Pin number Port name Description 79 STXMS Outputs scrambler mute signal for the AF mute circuit (IC481, pin 3). Low : While scrambler is muting. 80 MICMS Outputs mic mute signal for the AF mute circuit (IC481, pin 7). Low : While the microphone is muting. 81 ISPMS Outputs the internal speaker control signal. High : While the speaker is muting.
4-5-2 EXPANDER IC (MAIN UNIT; IC341) CPU–Continued Pin number Port name DOWN Input port for the [DOWN] key. Low : While [DOWN] key is pushed. 112 CH/WX Input port for the [CH/WX] key. Low : While [CH/WX] key is pushed. 113 16/9 Input port for the [16/9] key. Low : While [16/9] key is pushed. 114 SCAN Input port for the [SCAN] key. Low : While [SCAN] key is pushed. 111 115 119 Pin number Description H/L Input port for the [H/L] key. Low : While [H/L] key is pushed.
SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION When adjusting IC-M88, optional OPC-966 CLONING CABLE, optional RS-232C CABLE and optional CS-M88 adj ADJUSTMENT SOFTWARE are required. EQUIPMENT GRADE AND RANGE DC power supply Output voltage Current capacity : 7.2 V DC : 3 A or more RF power meter (terminated type) Measuring range Frequency range Impedance SWR : 0.1–10 W : 100–300 MHz : 50 Ω : Less than 1.2 : 1 Frequency counter Digital multimeter Frequency range : 0.
• CONNECTION to the antenna connector Attenuator 40 dB or 50 dB FM deviation meter Standard signal generator 0.1 V to 32 mV ( 127 dBm to 17 dBm) CAUTION: DO NOT transmit while SSG is connected to the antenna connector. RF power meter 0.
• SCREEN EXAMPLE CS-M88 ADJ Rev.1.0 File Option COM 1: OPEN 2 Connect Reload (F5) Disp para 1 4 5 [A / D] BATT : NOIS : SD : LVIN : TEMPS : TXDET : WET : 120 59 44 119 178 0 255 : : : : : : : 78h 3Bh 2Ch 77h B2h 00h FFh [D / A] FRQCON T1/POW T2 T3 T4 Dev CTCS BL SQL LEV : 7.53 V : 1.16 V : 0.86 V : 2.33 V : 26.86 ’C : 0.00 V : 5.00 V : : : : : : : : 127 92 127 86 117 0 0 76 : : : : : : : : 7Fh 5Ch 7Fh 56h 75h 00h 00h 4Ch : : : : : : : : 2.49 V 1.80 V 2.49 V 1.69 V 2.29 V 0.00 V 0.00 V 1.
5-2 SOFTWARE ADJUSTMENT Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE ADJUSTMENT UNIT ADJUSTMENT CONDITION UNIT LOCATION PLL LOCK VOLTAGE 1 • Operating channel : center frequency • Receiving MAIN Connect the digital multimeter to 1.5–3.0 V (Verify) the check point LV.
• MAIN UNIT TOP VIEW LV PLL lock voltage check point 5-5
SOFTWARE ADJUSTMENT – continued • Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. • “SQUELCH LEVEL ADJUSTMENT” must be performed after “RX SENSITIVITY ADJUSTMENT” is finished. • “SQUELCH LEVEL ADJUSTMENT” must be performed when “RX SENSITIVITY ADJUSTMENT” is adjusted.
SECTION 6 PARTS LIST [LOGIC UNIT] [VR UNIT] REF NO. ORDER NO. DESCRIPTION R801 7210003130 VAR TP76N97N-13F-10KA-2497 W801 W802 8900011900 CBL 8900011910 CBL 8900012031 CBL OPC-1192 OPC-1193 OPC-1231A [US], [SEA] [US1] 0910055622 PCB 0910055991 PCB B 5892B B 5982A [US], [SEA] [US1] EP801 REF NO. H/V M. LOCATION [CONNECTOR UNIT] REF NO. ORDER NO. H/V M.
[LOGIC UNIT] REF NO. [LOGIC UNIT] ORDER NO. DESCRIPTION REF NO. H/V M.
[MAIN UNIT] REF NO. [MAIN UNIT] ORDER NO. DESCRIPTION IC1 IC141 IC231 IC251 IC261 IC281 IC282 IC311 IC331 IC341 IC381 IC382 IC383 1140005990 1110002750 1110003200 1190000350 1110003800 1130007300 1130006220 1120002830 1190001860 1130007570 1110004990 1110003800 1130007990 S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.
[MAIN UNIT] [MAIN UNIT] REF NO. R112 R113 R114 R121 R122 R131 R132 R133 R141 R142 R143 R144 R145 R146 R147 R148 R149 R151 R152 R153 R154 R155 R156 R165 R166 R167 R171 R172 R173 R175 R181 R182 R183 R184 R185 R186 R191 R192 R193 R201 R202 R203 R204 R205 R206 R211 R213 R214 R215 R216 R221 R222 R223 R231 R232 R233 R234 R235 R236 R237 R238 R239 R240 R241 R242 R243 R244 R245 R246 R251 R261 R262 R263 R264 R265 R266 R267 R269 R270 R271 R272 R273 R274 R275 R276 R277 R278 R279 R280 R281 R283 R284 ORDER NO.
[MAIN UNIT] [MAIN UNIT] REF NO.
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] REF NO. ORDER NO. [MAIN UNIT] DESCRIPTION REF NO. QTY. J41 6910014700 2600 ANT connector 1 W1 W2 W41 7120000470 7120000470 8900011880 Jumper ERDS2T0 Jumper ERDS2T0 Cable OPC-1210 (P=0.
NOTE 1 MP45 (C) SP1 (C) NOTE 2 J41 (C) MP44 (C) NOTE 1 MP32 (C) NOTE3 MP33 (C) NOTE 3 MP4 (C) MP31 (C) MP42 (C) R801 (VR) NOTE3 MP6 (C) MP54 (C) MP43 (C) MP66 (C) VR UNIT W802 (VR) NOTE 2 MP51 (C) MP46 (C) DS681 (L) MP682 (L) MP65 (C) EP681 (L) W801 (VR) MP683 (L) NOTE3 MP5 (C) MP461 (L) MC461 (L) MP55 (C) MP681 (L) MP462 (L) MP52 (C) MP111 (M) MP11 (C) NOTE 1 MP53 (C) MP101 (M) MP10 (C) MP7 (C) MP9 (C) MP35 (C) MP71 (C) MP72 (C) NOTE 3 MP13 (C) MP42 (M) MP151 (M) MP43 (M) MP52
• BC-152 CHARGER PARTS LIST ACCESSORY PARTS ELECTRICAL PARTS REF NO. ORDER NO. IC1 IC2 IC3 IC4 IC5 1180000970 1190001180 1110005960 1190001470 1110002700 S.IC S.IC S.IC S.IC S.IC AN78L05M-(E1) MM1332BFBE S-80833CNMC-B8S-T2 TB1009AF(EL) NJM2904M-TE1 1 1 1 1 1 Q1 Q2 Q3 Q4 Q5 Q6 1540000550 1510000500 1590002880 1520000450 1590000700 1590000930 S.TRANSISTOR S.TRANSISTOR S.FET S.TRANSISTOR S.TRANSISTOR S.
SECTION 8 SEMI-CONDUCTOR PARTS LIST INFORMATION 8 - 1 TRANSISTORS AND FETs • MAIN unit and LOGIC unit 2SB1132 T100 Q (Symbol: BAQ) 2SA1588-GR (Symbol: ZG) E C E E 2SC5107 O (Symbol: MFO) 2SC4226-T1 R25 (Symbol: R25) B C E E 3SK294 (Symbol: UV) 3SK299-T1 U73 (Symbol: U73) S G1 CPH3403-TL (Symbol: KC) S G2 D G2 RD01MUS1 (Symbol: K2) RD07MVS1 (Symbol: RD07MVS1) D G S G DTC144EUA (Symbol: 26) S A C A C A MA8062-M(TX) (Symbol: 6-2) MA8056-M (Symbol: 5-6) C C A C1 B1 B2 E2 B
SECTION 9 BOARD LAYOUTS 9 - 1 CHARGER UNIT (BC-152) • BOTTOM VIEW 65 65 60 60 55 55 50 50 45 45 40 40 35 35 30 30 25 25 20 20 15 15 10 10 5 5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 70 65 60 55 50 Horizontal 45 40 35 30 25 20 15 10 5 0 Horizontal 9-2 VR UNIT 9-3 CONNECTOR UNIT • TOP VIEW • BOTTOM VIEW • BOTTOM VIEW J41 VOLIN VOLO • TOP VIEW J41 W801 W801 W801 GND to LOGIC UNIT J411 9 8 10 to MAIN UNIT J281 W802 FHV W802 VCC 7
9-4 MAIN UNIT • TOP VIEW The combination of this page and next page shows the unit layout in the same configuration as the actual P.C. Board.
MAIN UNIT The combination of this page and previous page shows the unit layout in the same configuration as the actual P.C. Board.
9-5 LOGIC UNIT The combination of this page and next page shows the unit layout in the same configuration as the actual P.C. Board.
LOGIC UNIT • BOTTOM VIEW 70 65 60 55 50 45 40 Horizontal 35 30 25 20 15 10 5 0 50 PTT SQL 45 1 CP442 40 SPE SP1 CP441 AFOUT 35 J411 J401 GND VOLO to VR UNIT 25 20 to MAIN UNIT J351 15 CP459 EXTPTT CP458 EXTMIC CP457 EXTTXD CP456 EXTRXD CP455 ERESET CP454 GND CP452 CP453 EDETEDT 0 EXTVCC 5 CP451 10 AFOUT Vertical VOLIN 30 VCC VCC VOLIN BTYPE S5V M5V V5VS R5VS T5VS MICO SMICO W/NS TEMPV LOINV CDECV UNLKI MODIN CDTENC VSSTBO EXSTBO DASTBO PLSTBO SDATAO SCLKO E
SECTION 10 BLOCK DIAGRAM Common Q47: XP6501 V5V Transmit MAIN UNIT Receive RIPPLE FIL VCO LVINV Q3: 2SK880 Q1: 2SK1829 BUFF ANTENNA Q41: 2SC4226 D31-34: HVC350B BUFF Q61: 2SC4215 Q62: 2SC4215 BUFF BUFF Power supply Vcc 2 DTCON Vcc D39: 1SV245 X1: CR-664A 15.
SECTION 11 VOLTAGE DIAGRAM VCC VCC S5V R2 22 R1 150k VR UNIT VCC FHV to LOGIC J411 1 2 3 W801 W801 W801 3 2 1 1 2 W802 VCC W802 J281 1 VOLIN VOLO GND S5V S5V R12 47 EP3 EP2 TEMPV R801 10k-A C5 0.1 F281 ERBFE3R00U R5 100k HV CP282 HV R4 NTCG16 4LH 473KT FRCON R6 10k DTCON Q1 2SK1829 BATTERY CP281 C3 0.001 9 CLOCK 10 DATA 11 LE 12 FC 13 NC 14 FOUT 15 P 16 B SDATA C802 0.001 4 3 4.78V C4 47p 5 2 6 1 R19 470 R18 1k R17 100 R7 27k C7 0.
VCC VCC T5V L61 0.1 H R62 68k DO1 C56 0.01 R53 4.7 R51 2.7k DO2 DO2 C81 12p Q51 2SC4226 4 L82 3.3 H C54 18p R52 5.6k Q62 2SC4215 R72 5 Q82 DTC144EU VCOS C91 9p C73 12p C75 56p R193 3.3k C194 0.022 C195 0.001 TX: 0.0V RX: 0.89V C203 8p TX: 0.0V RX: 4.20V W202 R206 4.7k R205 470 L181 56nH C188 6p DASTB SCLK SDATA T4CON 22 T3CON VIN2 VIN7 VDD GND 20 6 7 LD RESET 19 VDAREF 18 FRCON 11 12 DO VIN6 VIN3 VOUT3 VOUT4 IC141 TA75S01F Q165 3SK294 R165 100k C184 2.
LEDS1 LEDS1 LEDS2 10 11 V5VS R5VS V5VS R5VS T5VS GND T5VS LEDS2 1 MICO SMICO 13 15 16 17 18 CP642 R654 680 4 LEDS1 GND 14 5 3 SMICO CPU5V SQL R653 1k 2 MICO 12 S641 EVQ-PUL R652 220 W/NS TEMPV TEMPV LOINV LOINV CDECV CDECV Q651 XP1213 LED ON: 5.00V W/NS C643 0.01 CENC1 CENC2 CENC3 CENC1 CENC2 CENC3 PTTIN EPTTI PTTIN EPTTI BTYPE TDEC CP641 BTYPE SQL UP DOWN CH/WX 16/9 SCAN H/L TDEC UNLKI 19 GND MODIN CDTENC CDTENC 22 R611 10k BEEPO C612 0.
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