Icom HM-169 User manual

S-14421XZ-C1
Dec. 2007
GPS SPEAKER MICROPHONE
SPEAKER MICROPHONE
All manuals and user guides at all-guides.com
all-guides.com

This service manual describes the latest service information
for the HM-169/HM-174 SPEAKER MICROPHONE and
HM-170GP/HM-175GPS GPS SPEAKER MICROPHONE
at the time of publication.
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
MODEL GPS
HM-169 N/A
HM-174
HM-170GP Ye s
HM-175GPS
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit Icom parts numbers
2. Component name
3. Equipment model name and unit name
4. Quantity required
<ORDER EXAMPLE>
1110006490 S.IC LMV321IDCKR HM-175GPS MAIN-A UNIT 1 piece
Addresses are provided on the inside back cover for your
convenience.
Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other countries.
ORDERING PARTS
1. Make sure the problem is internal before disassembling
the speaker microphone.
2. DO NOT open the speaker microphone until the
transceiver is disconnected from its power source.
3. DO NOT force any of the variable components. Turn
them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An
insulated tuning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the
speaker microphone is defective.
6. READ the instructions of test equipment throughly
before connecting a test equipment to the speaker
microphone.
REPAIR NOTES
INTRODUCTION
(HM-175GPS)
UNIT ABBREVIATIONS:
SW=SW UNIT
M=MAIN-A/B UNIT
All manuals and user guides at all-guides.com

CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 ELECTRICAL PARTS LIST
SECTION 3 MECHANICAL PARTS LIST
SECTION 4 EXPLOADED VIEW
SECTION 5 BOARD LAYOUTS
SECTION 6 BLOCK DIAGRAM
SECTION 7 VOLTAGE DIAGRAMS
All manuals and user guides at all-guides.com

1 - 1
SECTION 1 SPECIFICATIONS
MGENERAL
• Power supply
(Supplied from the connected transceiver)
:HM-169/HM-170GP 5.0–8.4 V DC
HM-174/HM-175GPS 5 V DC
• Current drain : HM-169/HM-174 4 mA max. (at 5 V)
HM-170GP/HM-175GPS 65 mA max. (at 5 V)
• Dimensions (Projections not included) : HM-169/HM-174 62 (W)×89 (H)×40 (D) mm;
(2
7/16 (W)×3 1⁄2(H)×1 9⁄16 (D) in.)
HM-170GP/HM-175GPS 62 (W)×105 (H)×40 (D) mm
(2
7/16 (W)×4 1⁄8(H)×1 9⁄16 (D) in.)
• Curly cable length : 300 mm (±20 mm); 11 13/16 in. (±2/32 in.)
• Operating temperature range : –30˚C to +60˚C (–22˚F to +140˚F)
• Weight (approx.) : HM-169/HM-174 200 g (7 17/32 oz.)
HM-170GP/HM-175GPS 220 g (7 3/4 oz.)
• Speaker impedance :8Ω
• Rated output : 1 W (at 5% distortion)
2 W (at maximum)
MGPS RECEIVER
• Time to first fix (TTFF)
(open space)
:Cold start 40 sec. typical
Worm start 36 sec. typical
Hot start 4 sec. typical
All stated specifications are subject to change without notice or obligation.
All manuals and user guides at all-guides.com

2 - 1
SECTION 2 ELECTRICAL PARTS LIST
M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side)
[MAIN-A UNIT] (for HM-169, HM-174)
REF ORDER DESCRIPTION M. H/V
NO. NO.
LOCATION
IC1 1180002690 S.REG S-812C36AMC-C2Q-T2G T 34.1/45.8
IC2 1110006490 S.IC LMV321IDCKR T 28.6/39.9
IC3 1130007021 S.IC TC7S66FU (TE85L,F)
[HM-174] only T 28.7/31.1
Q3 1590003230 S.TR UNR9113J-(TX) [HM-174] only T 31.1/29.7
R1 7030003500 S.RES ERJ3GEYJ 332 V (3.3 k) T 29.5/52.6
R2 7030003320 S.RES ERJ3GEYJ 101 V (100) T 29.5/49.3
R3 7030003620 S.RES ERJ3GEYJ 333 V (33 k) T 28.7/41.8
R4 7030003620 S.RES ERJ3GEYJ 333 V (33 k) T 25.6/41.8
R5 7030003320 S.RES ERJ3GEYJ 101 V (100) T 24.4/39.1
R6 7310004790 S.TRI EVM-3YSX50 B14 (103) B 35.5/48.5
R7 7030003680 S.RES ERJ3GEYJ 104 V (100 k) T 25.6/35.4
R8 7030003420 S.RES ERJ3GEYJ 681 V (680) T 25.6/33
R9 7030003620 S.RES ERJ3GEYJ 333 V (33 k)
[HM-174] only T 25.6/30.6
R13 7030003860 S.RES ERJ3GE JPW V T 30.8/51.4
R14 7030003860 S.RES ERJ3GE JPW V [HM-169] only T 20/29.8
R16 7030003700 S.RES ERJ3GEYJ 154 V (150 k)
[HM-174] only T 20.9/14.8
R17 7030003320 S.RES ERJ3GEYJ 101 V (100) T 29.5/46.1
R19 7510001730 S.TMR ERTJOEP 473J T 25.3/36.6
R20 7030003760 S.RES ERJ3GEYJ 474 V (470 k) T 25.6/37.7
R21 7030003560 S.RES ERJ3GEYJ 103 V (10 k)
[HM-174] only T 28.8/29.1
R22 7030003860 S.RES ERJ3GE JPW V [HM-169] only T 28.5/33
C1 4030006850 S.CER C1608 JB 1H 471K-T T 31.6/54.6
C2 4030012660 S.CER C1608 JB 1E 683K-T T 31.6/53.4
C3 4510008540 S.ELE EEE1CA100SR T 26/51.9
C4 4030006900 S.CER C1608 JB 1H 103K-T T 32/48.7
C5 4030007090 S.CER C1608 CH 1H 470J-T T 26.3/39.9
C6 4030011600 S.CER C1608 JB 1E 104K-T T 37.3/45.2
C7 4030006870 S.CER C1608 JB 1H 222K-T T 25.6/34.2
C8 4510008540 S.ELE EEE1CA100SR T 26/46.5
C9 4030017490 S.CER C1608 JB 1A 105K-T T 25.6/31.8
C10 4030017490 S.CER C1608 JB 1A 105K-T T 35/43.5
C13 4030006850 S.CER C1608 JB 1H 471K-T T 23.4/22
C14 4030006850 S.CER C1608 JB 1H 471K-T T 24.6/25.1
C15 4030006850 S.CER C1608 JB 1H 471K-T T 23.4/20.3
C16 4030006850 S.CER C1608 JB 1H 471K-T T 23.4/18.5
C17 4030006850 S.CER C1608 JB 1H 471K-T T 20.7/17.8
C18 4030006850 S.CER C1608 JB 1H 471K-T
[HM-169] only T 22.2/14.8
C19 4030011600 S.CER C1608 JB 1E 104K-T T 23.5/13.3
C20 4030017490 S.CER C1608 JB 1A 105K-T T 31.6/46.1
C21 4030006850 S.CER C1608 JB 1H 471K-T T 11.4/31.7
C23 4030006850 S.CER C1608 JB 1H 471K-T T 28.7/43.6
J1 6510019421 S.CNR B8B-ZR-SM4-TF (LF) (SN) T 29.6/17.8
MC1 7700002770 MIC AM-627P-462C33-1
S1 2260000980 SW SKHHLP014A
EP1 6910012350 S.BEA MMZ1608Y 102BT T 28.7/55.3
S.=Surface mount
[MAIN-B UNIT] (for HM-170GP, HM-175GPS)
REF ORDER DESCRIPTION M. H/V
NO. NO.
LOCATION
IC2 1110006490 S.IC LMV321IDCKR T 18.3/42.6
IC4 1190002580 S.IC ITRAX03-S B 30.5/35.5
IC6 1130014070 S.IC SN74LVC1G38DCKR B 28.7/24.1
IC8 1190002620 S.IC S-8521F33MC-BPST2G T 8.2/23.5
IC9 1130007431 S.IC TC7S14FU (TE85R,F)
[HM-175GPS] only B 23.2/47.8
IC10 1130007261 S.IC TC7W74FU (TE12L,F)
[HM-175GPS] only B 26.6/50.3
IC11 1110005731 S.IC S-80928CNMC-G8Y-G
[HM-175GPS] only B 31.2/50.2
IC13 1130012600 S.IC SN74AHC1G04DCKR B 28.7/21.2
IC14 1130007021 S.IC TC7S66FU (TE85L,F)
[HM-175GPS] only T 14.6/47.9
Q3 1530002851 S.TR 2SC4116-BL (TE85R,F) T 14.6/42.7
Q4 1590001170 S.TR XP1501-(TX) [HM-175GPS] only B 22.9/53
Q5 1550000140 S.FET CPH6316-TL-E T 16.1/20
Q6 1590003230 S.TR UNR9113J-(TX)
[HM-175GPS] only T 17/48
D1 1730002320 S.ZEN MA8051-M (TX) [HM-170GP] only B 31.9/22.1
D4 1790001250 S.DIO MA2S111-(TX) B 24.3/24.9
D5 1750001110 S.DIO SM240A-T T 9.5/20
D6 1790001250 S.DIO MA2S111-(TX) [HM-170GP] only B 25.4/19.2
D7 1790001240 S.DIO MA2S728-(TX) [HM-175GPS] only T 15.5/50.3
L1 6200003960 S.COL MLF1608A 1R0K-T T 24.5/18.6
L2 6200003960 S.COL MLF1608A 1R0K-T T 23.7/16
L3 6200013250 S.COL SLF6025T-330MR59-PF T 14.5/25.7
L4 6200003960 S.COL MLF1608A 1R0K-T
[HM-170GP] only T 23.7/13.2
L5 6200005011 S.COL NLV25T-100J T 23.4/22.2
R4 7030005060 S.RES ERJ2GEJ 333 X (33 k) T 18.7/40.8
R5 7030005060 S.RES ERJ2GEJ 333 X (33 k) T 22.4/42.2
R6 7030004980 S.RES ERJ2GEJ 101 X (100) T 22.9/46.3
R7 7030005070 S.RES ERJ2GEJ 683 X (68 k) T 17.8/44.3
R8 7030005010 S.RES ERJ2GEJ 681 X (680) T 16.5/45.7
R9 7030005040 S.RES ERJ2GEJ 472 X (4.7 k) B 26.4/46.1
R12 7030005050 S.RES ERJ2GEJ 103 X (10 k) T 11.8/39.5
R13 7030004990 S.RES ERJ2GEJ 221 X (220) B 28.9/46.1
R14 7030004990 S.RES ERJ2GEJ 221 X (220) B 40/34
R16 7310004790 S.TRI EVM-3YSX50 B14 (103) B 35.5/48.5
R17 7030005090 S.RES ERJ2GEJ 104 X (100 k) B 26.1/23.2
R19 7030004990 S.RES ERJ2GEJ 221 X (220)
[HM-175GPS] only B 30.1/46.6
R21 7030004980 S.RES ERJ2GEJ 101 X (100) T 26.8/28.4
R22 7030004980 S.RES ERJ2GEJ 101 X (100) T 24.2/28.2
R23 7030004990 S.RES ERJ2GEJ 221 X (220)
[HM-175GPS] only T 24.1/44.6
R24 7030007290 S.RES ERJ2GEJ 222 X (2.2 k) B 15.4/47.4
R25 7030004980 S.RES ERJ2GEJ 101 X (100) T 11.8/41
R26 7030005050 S.RES ERJ2GEJ 103 X (10 k)
[HM-175GPS] only B 20.3/50
R27 7030005090 S.RES ERJ2GEJ 104 X (100 k)
[HM-175GPS] only B 21.2/50
R28 7030005050 S.RES ERJ2GEJ 103 X (10 k)
[HM-175GPS] only B 24.8/53
R28 7030010040 S.RES ERJ2GEJ-JPW [HM-170GP] only B 24.8/53
R29 7030005090 S.RES ERJ2GEJ 104 X (100 k)
[HM-175GPS] only B 26.4/47
R37 7030005050 S.RES ERJ2GEJ 103 X (10 k)
[HM-175GPS] only B 21.4/51.3
R41 7030005060 S.RES ERJ2GEJ 333 X (33 k)
[HM-175GPS] only T 23.1/19.5
R42 7030010040 S.RES ERJ2GEJ-JPW [HM-170GP] only T 24.3/10.3
R43 7030005050 S.RES ERJ2GEJ 103 X (10 k)
[HM-175GPS] only B 22.4/49.5
R44 7030010040 S.RES ERJ2GEJ-JPW [HM-170GP] only B 23.2/50.4
R47 7030005050 S.RES ERJ2GEJ 103 X (10 k) B 26.4/21.9
R48 7030010040 S.RES ERJ2GEJ-JPW [HM-175GPS] only B 26.1/54.3
R50 7030010040 S.RES ERJ2GEJ-JPW B 15.9/48.6
R51 7030010040 S.RES ERJ2GEJ-JPW [HM-170GP] only B 28.9/47
R53 7030005100 S.RES ERJ2GEJ 154 X (150 k)
[HM-175GPS] only T 23.4/11.8
R55 7510001730 S.TMR ERTJOEP 473J T 19/44.8
R56 7030005160 S.RES ERJ2GEJ 105 X (1 M) T 19.9/44.8
R57 7030005530 S.RES ERJ2GEJ 100 X (10) T 24.2/20.4
R58 7030005050 S.RES ERJ2GEJ 103 X (10 k) B 25.8/11.7
R59 7030005050 S.RES ERJ2GEJ 103 X (10 k)
[HM-175GPS] only T 18.2/47
R60 7030010040 S.RES ERJ2GEJ-JPW [HM-170GP] only T 12.7/48.4
R61 7030005010 S.RES ERJ2GEJ 681 X (680)
[HM-175GPS] only B 30.5/23.2
R62 7030007340 S.RES ERJ2GEJ 153 X (15 k)
[HM-175GPS] only B 30.5/24.8
C1 4030017730 S.CER ECJ0EB1E471K B 14.2/49.7
C2 4030017920 S.CER ECJ0EB1A683K B 14.2/48.8
C3 4030017420 S.CER ECJ0EC1H470J T 20.2/42.7
C4 4030017760 S.CER ECJ0EB1H222K T 17.8/45.2
C5 4030016930 S.CER ECJ0EB1A104K B 37.7/47.2
C6 4030017730 S.CER ECJ0EB1E471K T 23.1/24.5
All manuals and user guides at all-guides.com

2 - 2
M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side)
[MAIN-B UNIT] (for HM-170GP, HM-175GPS)
REF ORDER DESCRIPTION M. H/V
NO. NO.
LOCATION
C7 4030017330 S.CER ECJ0EF1C104Z T 12.7/44
C8 4030017730 S.CER ECJ0EB1E471K T 22/24.5
C9 4030017730 S.CER ECJ0EB1E471K T 25.7/24.7
C10 4030017330 S.CER ECJ0EF1C104Z [HM-170GP] only T 22.6/10.3
C11 4030017730 S.CER ECJ0EB1E471K T 33.8/21.4
C12 4030017730 S.CER ECJ0EB1E471K T 32.8/20.5
C14 4550006120 S.TAN TEESVA 0G 226M8R B 11.5/42.6
C15 4030017430 S.CER ECJ0EC1H101J [HM-170GP] T 22/14.6
4030018920 S.CER ECJ0EB1H392K [HM-175GPS] T 22/14.6
C16 4030018860 S.CER ECJ0EB0J105K T 15.2/46.1
C17 4030017730 S.CER ECJ0EB1E471K T 23.1/18.6
C18 4030017730 S.CER ECJ0EB1E471K T 23.1/17.7
C19 4030017330 S.CER ECJ0EF1C104Z B 25.1/22.8
C20 4030017430 S.CER ECJ0EC1H101J T 23/14.6
C21 4030016790 S.CER ECJ0EB1C103K B 19.6/42.4
C22 4030018910 S.CER C1608 JB 0J 475K-T B 18.4/42.1
C24 4030017640 S.CER ECJ0EC1H150J B 21.2/37.5
C25 4030016790 S.CER ECJ0EB1C103K B 40/28.9
C26 4030018860 S.CER ECJ0EB0J105K
[HM-175GPS] only B 21/52.8
C27 4030017330 S.CER ECJ0EF1C104Z B 26.1/24.8
C28 4030018860 S.CER ECJ0EB0J105K T 11.4/42.4
C29 4030016970 S.CER ECJ0EB1C223K T 21.1/42.7
C30 4030018860 S.CER ECJ0EB0J105K
[HM-175GPS] only B 20.3/48.4
C31 4030017330 S.CER ECJ0EF1C104Z [HM-175GPS] B 28.8/50.7
4030017730 S.CER ECJ0EB1E471K [HM-170GP] B 28.8/50.7
C32 4030017330 S.CER ECJ0EF1C104Z
[HM-175GPS] only B 25.1/46.6
C33 4030017330 S.CER ECJ0EF1C104Z
[HM-175GPS] only B 32.3/48
C43 4030017730 S.CER ECJ0EB1E471K [HM-170GP] only T 22.5/11.8
C44 4030017730 S.CER ECJ0EB1E471K [HM-170GP] only T 24.3/11.8
C50 4550007310 S.TAN F930J227MNMBMA B 10.9/27.7
C51 4030017490 S.CER C1608 JB 1A 105K-T T 17.2/17.6
C52 4550007310 S.TAN F930J227MNMBMA B 8.1/35.3
C53 4030018960 S.CER C3216 JB 1C 106MT-N B 17.1/19.2
C54 4030017490 S.CER C1608 JB 1A 105K-T T 24.3/25
C55 4030016930 S.CER ECJ0EB1A104K T 13.6/46.1
C56 4030017730 S.CER ECJ0EB1E471K B 7.1/54.2
C57 4510009010 S.ELE EEE1AA221P [HM-170GP] T 7.5/10.1
4510009020 S.ELE EEE0JA331P [HM-175GPS] T 7.5/10.1
C58 4030017730 S.CER ECJ0EB1E471K T 13.9/40.4
C59 4030017730 S.CER ECJ0EB1E471K T 16.3/40.4
C60 4030017330 S.CER ECJ0EF1C104Z
[HM-175GPS] only B 30.5/48
C61 4030017460 S.CER ECJ0EB1E102K B 27/24.8
C62 4030017460 S.CER ECJ0EB1E102K B 22.2/24.9
C63 4030017460 S.CER ECJ0EB1E102K [HM-170GP] only B 24.1/20.2
J1 6510019421 S.CNR B8B-ZR-SM4-TF T 29.6/17.8
J2 6510026330 CNR S02B-EH-S
J6 6510025970 S.CNR 41-002AA-R B 16.2/36.4
MC1 7700002770 MIC AM-627P-462C33-1
S1 2260000980 SW SKHHLP014A
EP1 6910018460 S.BEA MMZ1005Y102C-T B 15.4/49.8
EP2 6910018460 S.BEA MMZ1005Y102C-T B 17/42.9
S.=Surface mount
[SW UNIT] (for HM-170GP, HM-175GPS only)
REF ORDER DESCRIPTION M. H/V
NO. NO.
LOCATION
R1 7030009160 S.RES ERJ2GEJ 181 X (180)
[HM-175GPS] only T 6.7/5
J1 6910017360 CNR IMSA-9230B-04Z120-PT1
DS1 5040003240 S.LED UY1113F-TR [HM-175GPS] only T 8.8/8.6
S2 2260002710 S.SW SKQLLCE012 B 8.8/6.6
All manuals and user guides at all-guides.com
all-guides.com

Screw abbreviations A, B0, BT: Self-tapping PH: Pan head ZK: Black NI-ZU: Nickel-Zinc SUS: Stainless
3 - 1
SECTION 3 MECHANICAL PARTS
[CHASSIS PARTS]
REF ORDER DESCRIPTION QTY.
NO. NO.
SP1 2510001330 036D0803 1
W1 7120000470 ERDS2T0 [HM-169], [HM-174] 1
8900014920 OPC-1565 [HM-170GP], [HM-175GPS] 1
W2 7120000470 ERDS2T0 [HM-169], [HM-174] only 1
W3 8900016770 OPC-1734 [HM-169], [HM-170GP] 1
8900017190 OPC-1755 [HM-174], [HM-175GPS] 1
W4 8900016560 OPC-1716 [HM-170GP], [HM-175GPS] only 1
EP1 3310003720 GEOHELIX-S [HM-170GP], [HM-175GPS] only 1
MP1 8210024390 3065 A-FRONT PANEL (Inc. MP16)
[HM-169], [HM-174] 1
8210024370 3065 FRONT PANEL (Inc. MP16) [HM-170GP] 1
8210024380 3065 FRONT PANEL (A) (Inc. MP16) [HM-175GPS] 1
MP2 8210024330 3065 REAR PANEL 1
MP3 8930073590 3065 PTT BUTTON 1
MP4 8930073600 3065 ANT CAP [HM-170GP], [HM-175GPS] only 1
MP5 8930073650 3065 MAIN SEAL 1
MP6 8930073660 3065 PTT RUBBER 1
MP7 8930073670 3065 TOP BUTTON [HM-170GP] 1
8930073680 3065 TOP BUTTON (A) [HM-175GPS] 1
MP8 8930073840 3065 MIC RUBBER 1
MP9 8930074240 O-RING (BX) [HM-170GP], [HM-175GPS] only 1
MP10 8930073760 3065 PTT PLATE 1
MP11 8930073830 3065 ANT PLATE [HM-170GP], [HM-175GPS] only 1
MP12 8930073770 3065 TOP PLATE [HM-170GP], [HM-175GPS] only 1
MP13 8930073780 3065 BUSH PLATE 1
MP14 8930073690 3065 SPRING 1
MP15 8930073960 3065 BELT CLIP 1
MP16 8930073610 SP NET (D) 1
MP17 8930068980 2905 VENT SHEET 2
MP20 8930055920 INSULATION SHEET (GQ) 1
MP21 8810009561 SCREW BT B0 2X6 NI-ZK3 (BT) 4
MP22 8810009561 SCREW BT B0 2X6 NI-ZK3 (BT)
[HM-170GP], [HM-175GPS] only 2
MP23 8810010121 SCREW PH B0 2X8 SUS SSBC 2
MP24 8820001320 2795 SCREW 4
MP25 8930063690 O-RING (BA) 2
[MAIN-A UNIT] (for [HM-169], [HM-174])
[SW UNIT] (for [HM-170GP], [HM-175GPS] only)
REF ORDER DESCRIPTION QTY.
NO. NO.
J1* 6510019421 B8B-ZR-SM4-TF (LF) (SN) 1
MC1 7700002770 AM-627P-462C33-1 1
S1* 2260003120 SKQJLBA010 1
REF ORDER DESCRIPTION QTY.
NO. NO.
J1 6910017360 IMSA-9230B-04Z120-PT1 1
S2* 2260002710 SKQLLCE012 1
*: Refer to SECTION 5 “BOARD LAYOUTS.”
[MAIN-B UNIT] (for [HM-170GP], [HM-175GPS])
REF ORDER DESCRIPTION QTY.
NO. NO.
J1* 6510019421 B8B-ZR-SM4-TF (LF) (SN) 1
J2* 6510026330 S02B-EH-S (LF) (SN) 1
J6* 6510025970 41-002AA-R 1
MC1 7700002770 AM-627P-462C33-1 1
S1* 2260003120 SKQJLBA010 1
MP1* 8510016470 2775 VCO CASE 1
All manuals and user guides at all-guides.com

4 - 2
SP1
MP1(HM-170GP, HM-175GPS)
MP16
MP17
MP17
MP20
MP25
MP25
MP24
MP24
MP24
MP24
MP23
MP23
MP3
MP6
MC1(M)
MP21
MP21
MP21
MP21
J1(SW)
MP13
W3
MP11
MP22
MP22
MP15
MP12
MP10
MP14
MP7
SW UNIT
MP8
MAIN UNIT
MP4
MP9
MP2
MP5
MP1(HM-169, HM-174)
EP1
SECTION 4 EXPLOADED VIEW
All manuals and user guides at all-guides.com

5 - 1
SECTION 5 BOARD LAYOUTS
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C13
C14
C15
C16
C17
C18
C19
C20
C21
C23
C24 D3
EP1
IC1
IC2
IC3
J1
MC1
Q3
R1R2
R3R4
R5
R7
R8
R9
R13
R14
R16
R17
R19
R20
R21
R22
R23
S1
B6842C
H0H5H10H15H20H25H30H35H40
V0 V5 V10 V15 V20 V25 V30 V35 V40 V45 V50 V55
C3
C4
C6
C7
C8
C9
C10
C11
C12
C15
C16
C17
C18
C20
C28
C29
C43 C44
C51
C54
C55
C57
C58
C59
D5
D7
IC2
IC8
IC14
J1
J2
L1
L2
L3
L4
L5
MP1
Q3
Q5
Q6
R4
R5
R6
R7
R8
R12
R21
R22 R23
R25
R41
R42
R53
R55
R56
R57
R59
R60
S1
B6796D
MC1
H0H5H10H15H20H25H30H35H40
V0 V5 V10 V15 V20 V25 V30 V35 V40 V45 V50 V55
DS1
R1
B6861B
H0H5H10H15
V0 V5
• MAIN-A UNIT (for HM-169, HM-174)
(TOP VIEW)
GND
SW
3.3V
LED
GND
SW
3.3V
LED
• SW UNIT (for HM-170GP HM-175GPS only)
(TOP VIEW)
• MAIN-B UNIT (for HM-170GP HM-175GPS)
(TOP VIEW)
SP+ 1 SP− 2
SP1 (CHASSIS)
W1 (CHASSIS)
SP–
SP+
VCC
MIC
GND
PTT
SP–
SP+
VCC
MIC
NMEA
XTXD
GND
PTT
All manuals and user guides at all-guides.com

5 - 2
R6
R6
H0 H5 H10 H15 H20 H25 H30 H35 H40
V0V5V10V15V20V25V30V35V40V45V50V55
C1
C2
C5
C14
C19
C21
C22
C24
C25
C26
C27
C30
C31
C32
C33
C50
C52
C53
C56
C60
C61
C62
C63
D1
D4
D6
EP1
EP2
IC4
IC6
IC9
IC10
IC11
IC13
J5
J6
Q4
R9R13
R14
R16
R16
R17
R19
R24
R26
R27
R28
R29
R37
R43
R44
R47
R48
R50
R51
R58
R61R62
H0 H5 H10 H15 H20 H25 H30 H35 H40
V0
V5V10
V15
V20V25
V30
V35
V40
V45
V50
V55
J1
S2
H0 H5 H10 H15
V0V5
• MAIN-A UNIT (for HM-169, HM-174)
(BOTTOM VIEW)
GND
SW
3.3V
LED
GND
MIC
MC1
SP1 (CHASSIS)
W1 (CHASSIS)
MICG
SW
3.3V
LED
SW
• SW UNIT (for HM-170GP HM-175GPS only)
(BOTTOM VIEW)
• MAIN-B UNIT (for HM-170GP HM-175GPS)
(BOTTOM VIEW)
[GPS]
MIC
MC1
MICG
All manuals and user guides at all-guides.com

6 - 1
SECTION 6 BLOCK DIAGRAMS
1
2
3
4
5
6
7
8
MIC
AMP
150K
MIC
GND
MUTE
MICROPHONE
PTT
IC2
IC3, Q3
(HM-169/HM-174)
MIC
PTT
SPEAKER
SP-
Vcc
SP+
REG
IC1
+3.6V
(HM-169/HM-174)
(HM-169)
(HM-169) (HM-174)
N/C
SP+
GND
MIC
SP-
Vcc
SENS
N/C
• MAIN-A UNIT (for [HM-169], [HM-174])
All manuals and user guides at all-guides.com
all-guides.com

MIC
AMP
GPS ANTENNA
1
2
3
4
5
6
7
8
150K
SPEAKERMICROPHONE
GND
XTXD
SP+
SP-
PTT
MIC
Vcc
GPS
LELEV
SHIFTER
RX
TX
ANT 3.3V
SWITCHING
REG
RIPPLE
FILTER
+3.3V
Q3, C14
IC8, Q5, D5, L3
IC2
Serial
Serial
D4
IC13, IC6
NMEA
LEVEL
SHIFTER
D6
(HM-170GP)
+3.3V
RESET
PPS
IC4
LED
DRIVER
+3.3V
Q4
DS1
SW1
SW UNIT (HM-175GPS)
GPS
ON/OFF
Sleep
(HM-175GPS)
IC11
IC9, IC10
(HM-175GPS)
(HM-175GPS)
(HM-175GPS)
(HM-175GPS)
(HM-170GP)
CHASSIS UNIT
MIC
MUTE
IC14, Q6
(HM-175GPS)
PTT
SW1
SW UNIT (HM-170GP)
(HM-170GP)
(HM-175GPS)
(HM-175GPS)
(HM-170GP)
NMEA
SP-
Vcc
SP+
SENS
GND
MIC
nc
6 - 2
• MAIN-B UNIT (for [HM-170GP], [HM-175GPS])
All manuals and user guides at all-guides.com

7 - 1
SECTION 7 VOLTAGE DIAGRAMS
CP7
CP5
CP6
CP8
LMV321IDCK
IC2
1
2
3
4
5
2.2 MSVA
C11
B8B-ZR-SM4-TF
J1
1
2
3
4
5
6
7
8
910
0.01
C4
470P
C1
470P
C13
470P
C14
470P
C15
470P
C16
470PC17
470P
C18
1
C20
47P
C5
100
R2
33K
R4
33K
R9
0
R14
MMZ1608Y102BT
EP1
470P
C21
0.1
C19
1
C10
33K
R3
CP11
CP12
AM-627P
MC 1
100
R17
0
R13
10
C8
0.1
C6
1
C9
10 C3
ERTJ0EP473J
R19
0.068
C2
S-812C36AMC
IC1
1
GND 2
VIN 3
VOUT
4NC
5NC
47K
R7
3.3K
R1
10K
R6
680
R8
470K
R20
100
R5
0.0022
C7
470P
C23
TC7S66FU
IC3
1 2 34
5
10K
R21
0
R22
150K
R16
UNR9113J
Q3
0.01
C24
0
R23
SKQJLBA010S1
MICROPHONE
MIC
SW
PTT
XRXD
SP+
Vcc
GND
PTT
D_GND
SP-
To SPEAKER
(HM-174)
(HM-169)
(HM-169)
(HM-174)
(HM-169)
(HM-169)
(HM-174)
(HM-174)
(HM-174)
(#04)
(HM-174)
ON
T
OFF
2.81V
3.6V
1.79V 1.79V 0V
0V
3.56V
3.56V
@3.3V
• MAIN-A UNIT (for [HM-169], [HM-174])
All manuals and user guides at all-guides.com

7 - 2
*; Refer to “PARTS LIST.”
33K
R5
2.2K R24
470P
C9
0.1
C27
100K
R27
470P
C8
10KR28
ITRAX03
IC4
1TCAP1
2BOOT1
3SPI1XCS0
4SPI1SDO
5GND
6SPI1SDI
7SPI1CLK
8GND
9XRESET
10 BOOT2
11 GND
12 SPI1XCS2
13 MMCCMD
14 VDDRF 17
TXD0
18
RXD0
19
RXD1
20
GND
21
MMCCLK
22
GND
23
GND
24
RFIN
25
GND
26
GND
27
MMCDAT
28
VDDDIG
29
PM0
30
PPS
15 GND 16
TXD1
100KR29
100
R25
47P
C3
SM240A
D5
1U
L1
0.1 C31
1
C30
1
C28
CP7
MMZ1005Y102CT
EP1
0.1 C32
SKHHLP014A
S1
0.1
C10
MMZ1005Y102CT
EP2
41-002AA-R
J6
0.01
C25
1U
L2
0.1
C33
TC7W74F U
IC10
1CK
2D
3Q
4GND 5
Q
6
CLR
7
PR
8
VCC
33K
R41
100P
C20
10K
R37
1C26
470P C43
CP5
CP6
10K
R43
4.7
C22
100
R21
470P
C18
470P
C6
10K
R26
220R13
CP8
470P
C12
0
R42
XP1501
Q4
1 2 3 4
5
0R44
0.01
C21
100R22
1U
L4
0.1 C7
470P
C1
2SC4116
Q3
220
R23
10K
R12
15P C24
4.7K R9
470P C11
S-80928CNMC
IC11
1OUT
2VDD
3VSS 4
NC
5
CD
470P
C17
220 R14
TC7S14FU
IC9
1
2
34
5
CPH6316
Q5
4S
5D
6D1
D2
D3
G
AXK816145YG
J5
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
470P
C44
2775
MP 1
1 2 3 4
S-8521F33M C
IC8
1ON/OFF
2VSS
3VOUT 4
EXT
5
VIN
0
R48
LMV321IDCK
IC2
1
2
3
4
5
SN74AHC1G04DCK
IC13
1
2
34
5
SN74LVC1G38DCK
IC6
1
2
34
5
B8B-ZR-SM4-TF
J1
1
2
3
4
5
6
7
8
910
SLF6025T 330M 33U
L3
0
R50
0
R51
10U
L5
220
C50
1
C51
1
C54
10
C53
220
C52
33K R4
0.1
C19
AM-627P
MC 1
MA2S111
D4
M A2S111
D6
10K
R47
S02B-EH- S
J2
1
2
0.0022
C4
0.1
C5
1
C16
ERTJ0EP473J
R55
4.7KR19
4.7K
R17
0.1
C55
220
C57
470P
C58
470P
C59
0.068
C2
680
R8
470P
C56
10
R57
22 MSVA
C14
10K
R16
CF20OPEN
CP11
10K
R58
MA8051
D1
68K
R7
1M
R56
100
R6
0.022
C29
TC7S66FU
IC14
1
2
34
5
UNR9113J
Q6
0
R60
150K
R53
0.001
C61
0.001
C62
0.001
C63
0.1
C60
M A2S728
D7
100K
R59
0.001
C15
15K
R62
680
R61
3.3V
NMEA RX
MICROPHONE
MIC
SW
3.3V
To Active ANT
XRESET
PTT
SPEAKE R
NME A
SP+
BOOT
LED
XTXD
Vcc
GND
PTT
D_GND
SW UNIT
NMEA TX
SP-
(HM-170GP)
(HM-170GP:0)
(HM-170GP)
(HM-170GP)
(HM-175GPS)
(HM-175GPS)
(HM-175GPS)
(HM-170GP)
(HM-170GP)
(HM-170GP)
(HM-170GP)
(
(HM-170GP)
(HM-175GPS)
(HM-170GP)
(HM-175GPS:330)
(HM-170GP:470P)
(HM-170GP)
(HM-170GP)
(HM-175GPS)
(HM-175GPS)
(HM-175GPS)
(HM-175GPS)
(HM-175GPS)
R1
180
DS1
UY1113F-TR
SKQLLCE012
S2
J1
1
2
3
4
0V
3.22V
4.88V
3.28V
2.11V
1.36V
2.72V
1.36V
0V
3.31V
0V
3.30V
3.30V
0V
3.29V
OFF
ON
PTT
PTT
0V
1s
5V
• MAIN-B UNIT (for [HM-170GP], [HM-175GPS])
All manuals and user guides at all-guides.com

6F No.68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C.
Phone : [phone] Fax : [phone]
URL : http://www.asia-icom.com
E-mail : [email protected]
Zac de la Plaine
1 Rue Brindejonc des Moulinais BP 5804
31505 Toulouse Cedex, France
Phone : [phone] Fax : [phone]
URL : http://www.icom-france.com
E-mail : [e-mail]
Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K.
Phone : [phone] Fax : [phone]
URL : http://www.icomuk.co.uk
E-mail : [e-mail]
Ctra. Rubi, 88, 08190, Sant Cugat del Valles, Barcelona, SPAIN
Phone : [phone] Fax : [phone]
URL : http://www.icomspain.com
E-mail : [email protected]
<Corporate Headquarters>
2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A.
Phone : [phone] Fax : [phone]
URL : http://www.icomamerica.com
E-mail : [e-mail]
<Customer Service>
Phone : [phone]
Glenwood Centre #150-6165
Highway 17 Delta, B.C., V4K 5B8, Canada
Phone : [phone] Fax : [phone]
URL : http://www.icomcanada.com
E-mail : [e-mail]
Unit 1 / 103 Garden Road, Clayton VIC 3168 Australia
Phone : [phone] Fax : [phone]
URL : http://www.icom.net.au
E-mail : [email protected]
146A Harris Road, East Tamaki,
Auckland, New Zealand
Phone : [phone] Fax : [phone]
URL : http://www.icom.co.nz
E-mail : inquir[email protected].nz
10C07, Long silver Mansion, No.88, Yong Ding
Road, Haidian District, Beijing, 100039, China
Phone : [phone]
Fax : [phone]
URL : http://www.bjicom.com
E-mail : [email protected]
Sopot, 3 Maja 54 Poland
Phone : [phone] Fax : [phone]
E-mail : [email protected]
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan
Phone : [phone]
Fax : [phone]
URL : http://www.icom.co.jp/world/index.html
Communication Equipment
Himmelgeister Str. 100, D-40225 Dusseldorf, Germany
Phone : [phone] Fax : [phone]
URL : http://www.icomeurope.com
E-mail : [e-mail]
All manuals and user guides at all-guides.com

1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14421XZ-C1
© 2007 Icom Inc.
All manuals and user guides at all-guides.com
all-guides.com