Icom IC-M710 User manual

HF MARINE TRANSCEIVER
iM710
SERVICE
MANUAL

GMDSS
Others
GEN-23
EUR-21
INTRODUCTION
This service manual describes the latest service information
for the IC-M710 HF MARINE TRANSCEIVER.
DANGER
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 V. This will ruin the
transceiver.
DO NOT expose the transceiver to rain, snow or any liquids.
DO NOT reverse the polarities of the power supply when con-
necting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the transceiv-
er’s front end.
ORDERING PARTS
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required
<SAMPLE ORDER>
1160000130 S.IC TD62783AF IC-M710 MAIN UNIT 5 pieces
8810008560 Screw
PH M3×8 SUS ZK IC-M710 Top cover 10 pieces
Addresses are provided on the inside back cover for your
convenience.
REPAIR NOTES
1. Make sure a problem is internal before disassembling the
transceiver.
2. DO NOT open the transceiver 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 insu-
lated tuning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the trans-
ceiver is defective.
6. DO NOT transmit power into a signal generator or a
sweep generator.
7. ALWAYS connect a 50 dB to 60 dB attenuator between
the transceiver and a deviation meter or spectrum ana-
lyzer when using such test equipment.
8. READ the instructions of test equipment thoroughly
before connecting equipment to the transceiver.
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
MODEL SYMBOL
Others
Others
GMDSS
GEN-21
GEN-22
EUR-22
Version
IC-M710 GEN
EUR

TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 CIRCUIT DESCRIPTION
3 - 1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 1
3 - 2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 3
3 - 3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 5
3 - 4 DC-DC CONVERTER CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 6
3 - 5 CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 7
SECTION 4 ADJUSTMENT PROCEDURES
4 - 1 PREPARATION BEFORE SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4 - 2 PLL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2
4 - 3 POWER VOLTAGE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4 - 4 TRANSMITTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 4
4 - 5 RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 8
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS AND DISASSEMBLY
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUTS
8 - 1 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1
8 - 2 SENSOR1/2 BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1
8 - 3 MIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1
8 - 4 VR1 BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1
8 - 5 VR2 BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1
8 - 6 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 3
8 - 7 PLL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 5
8 - 8 PLL-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 7
8 - 9 PA150W BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 9
8 - 10 FILTER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 11
8 - 11 TERMINAL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 12
8 - 12 REG BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 13
8 - 13 ALARM BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 13
SECTION 9 BLOCK DIAGRAM
SECTION 10 VOLTAGE DIAGRAMS
10 - 1 FRONT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
10 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 2
10 - 3 PLL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 5
10 - 4 PLL-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 6
10 - 5 PA150W, TERMINAL, FILTER AND REG BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 7

- 1
SECTION 1 SPECIFICATIONS
■GENERAL
• Frequency coverage : Receive 0.5000 kHz–29.9999 MHz
Transmit 1.6000–2.9999 MHz 4.0000–4.9999 MHz
6.0000–6.9999 MHz 8.0000–8.9999 MHz
12.0000–13.9999 MHz 16.0000–17.9999 MHz
18.0000–19.9999 MHz 22.0000–22.9999 MHz
25.0000–27.50000 MHz
• Mode : J3E (USB), H3E (AM), J2B (AFSK), F1B (FSK), R3E, A1A (CW)
(Available modes differ according to versions)
• Number of channels : 1136 channels (max.)
[160 (user programmable), 242 (ITU SSB duplex), 72 (ITU simplex),
662 (ITU FSK duplex)]
• Antenna impedance : 50 Ω(nominal)
• Usable temperature range : –30˚C to +60˚C; –22˚F to +140˚F
(Specifications are guaranteed with –20˚C to +40˚C; –4˚F to +104˚F)
• Frequency stability : ±10 Hz (–30˚C to +60˚C; –22˚F to +140˚F)
(±20 Hz above 15 MHz for [GEN-21], [GEN-22], [EUR-21].)
• Power supply requirement : 13.6 V DC ±15% Negative ground [GEN]
13.6 V DC ±15% Floating ground [EUR]
• Current drain (at 13.6 V DC) :Transmit (max. output power) 30 A
Receive (max. audio output) 2.5 A [GEN]
3 A [EUR]
• Dimensions : 291.4(W)×315(D)×116.4(H) mm
(projections not included) 111/2(H)×1211/32(W)×419/32(D) in
• Weight : 7.9 kg; 1713⁄32 lb [Others]
: 8.1 kg; 1727⁄32 lb [GMDSS]
■TRANSMITTER
• Output power (at 13.6 V DC) : 150, 60, 20 W PEP (60, 20 W PEP only above 25 MHz) [GEN]
150, 60 W PEP (60 W PEP only above 25 MHz) [EUR]
125 W PEP (85 W PEP MF and 25 MHz bands) [GMDSS]
• Spurious emissions : –65 dB [GEN]
–60 dB [EUR]
• Carrier suppressions : 40 dB
• unwanted sideband suppression : 55 dB
• Microphone impedance : 600 Ω
■RECEIVER
• Sensitivity :
J3E, R3E, J2B, A1A, F1B 0.5 µV (1.8000–29.9999 MHz)
(for 12dB SINAD) 1.0 µV (1.6000–1.7999 MHz)
6.3 µV (0.5000–1.5999 MHz)
H3E (for 10dB S/N) 3.2 µV (1.8000–29.9999 MHz)
6.3 µV (1.6000–1.7999 MHz)
32 µV (0.5000–1.5999 MHz)
• Spurious response rejection : 70 dB (1.6000–29.9999 MHz)
• Audio output power : 4.5 W (at 10% distortion with a 4 Ω load)
• Audio impedance : 4 to 8 Ω
• Clarity variable range : ±150 Hz
All stated specifications are subject to change without notice or obligation.

•BOTTOM VIEW (MAIN UNIT)
8 - 4

1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14109HZ-C1
C2004 Icom Inc.

Icom IC-M710 Service Manual
Icom IC-M710 Service Manual
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Icom IC-M710 Service Manual
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Icom IC-M710 Service Manual
Icom IC-M710 Service Manual
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Icom IC-M710 Service Manual