Instruction/ maintenance manual of the product IC-M88 Icom
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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.
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 .............................................................................................
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.
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.
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) .
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 .
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.
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.
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 .
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 PLST.
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.
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.
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.
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.
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 .
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.
[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 sid.
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.
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.
[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.
[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.
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 22.
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) M.
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.
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.
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 .
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.
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 .
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.
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 LP.
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.
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.
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.
Asia Icom Inc. 6F No.68, Sec. 1 Cheng-T eh Road, T aipei, T aiwan, R.O .C. Phone : +886 (02) 2559 1899 F ax : +886 (02) 2559 1874 URL : http://www .asia-icom.
S-13909MZ-C2- q © 2002–2004 Icom Inc. 1-1-32 , Kamiminami, Hirano-ku, Osaka 547-0003, Japan.
An important point after buying a device Icom IC-M88 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Icom IC-M88 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Icom IC-M88 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Icom IC-M88 you will learn all the available features of the product, as well as information on its operation. The information that you get Icom IC-M88 will certainly help you make a decision on the purchase.
If you already are a holder of Icom IC-M88, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Icom IC-M88.
However, one of the most important roles played by the user manual is to help in solving problems with Icom IC-M88. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Icom IC-M88 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
