Icom IC-E7 Service Manual
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This service manual describes the latest service information
for the IC-E7 VHF/UHF DUALBAND FM TRANSCEIVER at
the time of publication.
ORDERING PARTS
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit Icom parts number
2. Component name and informations
3. Equipment model name and unit name
4. Quantity required
5030002860 LCD
A01B004X
IC-E7
Main unit 5 pieces
8810008990 Screw PH B0 2×10 ZK
IC-E7
Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
REPAIR NOTES
1. Make sure the 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 insulated turning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the transceiver is defective.
6. DO NOT transmit power into a signal generator or a sweep generator.
7. ALWAYS connect a 30 dB to 40 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when
using such test equipment.
8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.
To upgrade quality, all electrical or mechanical parts and internal
circuits are subject to change without notice or obligation.
MODEL
VERSION
SYMBOL
IC-E7
Europe
EUR
Italy
ITR
France
FRA
United Kingdom
UK
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.
NEVER connect the transceiver to an AC outlet or to a DC
power supply 3.7 V. Such a connection could cause a fire or
electric hazard.
DO NOT expose the transceiver to rain, snow or any liquids.
DO NOT reverse the polarities of the power supply when
connecting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the trans-
ceiver's front end.
DANGER
TABLE OF CONTENTS
SECTION 1
SPECIFICATIONS
SECTION 2
INSIDE VIEWS
SECTION 3
DISASSEMBLY INSTRUCTIONS
SECTION 4
CIRCUIT DESCRIPITON
4 - 1
RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1
4 - 2
TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2
4 - 3
PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3
4 - 4
PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 4
4 - 5
POWER SUPPLY CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 5
SECTION 5
ADJUSTMENT PROCEDURES
5 - 1
PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
5 - 2
FREQENCY AND TRANSMIT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 4
5 - 3
RECEIVE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 5
SECTION 6
PARTS LIST
SECTION 7
MECHANICAL PARTS AND DISASSEMBLY
SECTION 8
SEMICONDUCTOR INFORMATION
SECTION 9
BOARD LAYOUTS
9 - 1
MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
9 - 2
PA BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
9 - 3
VCO BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
SECTION 10
BLOCK DIAGRAM
SECTION 11
CIRCUIT DIAGRAM
SECTION 12
BC-164
1 - 1
SECTION 1
SPECIFICATIONS
GENERAL
• Frequency range
:
Version
Transmit (MHz)
Receive (MHz)
[EUR],
[UK]
144.000–146.000
430.000–440.000
0.495–999.990
[ITR]
144.000–146.000
430.000–434.000
435.000–438.000
144.000–146.000
430.000–434.000
435.000–438.000
[FRA]
146.000–146.000
430.000–440.000
0.495–29.995
50.200–51.200
76.000–135.995
144.000–146.000
430.000–440.000
• Operating mode
: FM, AM*, WFM* (*RX only)
• Memory channels
: 1000 channels
• Call channels
: 2 channels
• Scan types
: Full/Program/Pr ior ity/
Memory Channel/Bank/
Bank-Link/Skip/Tone
• Frequency stability
: ±6 ppm (–10°C to +60°C)
• Tuning steps
: 5/6.25/8.33/9/10/12.5/15/20/
25/30/50/100 and 200 kHz
• Antenna impedance
: 50 Ω (SMA type)
• Power supply requirement
: Specifi ed Icom's battery
pack only
(operating voltage 3.7 V)
• Current drain
:
TRANSMIT VHF High 1.5 A
Low 0.4 A (approx.)
UHF High 1.5 A
Low 0.5 A (approx.)
RECEIVE Stand-by
80 mA (approx.)
Max. audio
Less than 150 mA
• Operating temp. range
: –10°C to +60°C
• Dimensions
(projections not included)
: 47 (W) × 81 (H) × 28 (D) mm
• Weight
(antenna, BP-243 included)
: 160 g (approx.)
• MIC/SP connector
: 4-conductor 3.5 (d) mm; (1/8′′)
2 kΩ/8 Ω
TRANSMITTER
• Output power
:
VHF
UHF
1.5 W (High)
0.1 W (Low; aprrox.)
1.0 W (High)
0.1 W (Low; aprrox.)
• Modulation system
: Variable reactance frequency
modulation
• Maximum deviation
: ±5.0 kHz
• Spurious emissions
: Less than –60 dB (TX High)
Less than –50 dB (TX Low)
RECEIVER
• Receiving system
: Double conversion
superheterodyne system
• Intermediate frequencies
:
FM, AM
1st;
46.35 MHz
2nd; 450 kHz
WFM
1st;
14.85 MHz
2nd; 450 kHz
• Sensitivity*
:
(except spurious points; maximum sensitivity)
Frequency (MHz)
FM
AM
WFM
0.495–4.995
–
+7 dBµ
–
5.000–29.995
+3 dBµ
30.000–75.995
–7 dBµ
–
76.000–89.995
+5 dBµ
90.000–107.995
–14 dBµ
108.000–117.995
–
118.000–136.995
+3 dBµ
137.000–143.995
–
144.000–147.995
–15 dBµ
148.000–179.995
–14 dBµ
330.000–369.995
+5 dBµ
370.000–399.995
–10 dBµ
400.000–429.995
–13 dBµ
430.000–449.995
–15 dBµ
450.000–499.995
–5 dBµ
600.000–799.990
0 dBµ
+8 dBµ
799.995–939.990
–
940.000–999.990
+5 dBµ
*FM and WFM are measured at 12 dB SINAD, AM is easured
at 10 dB S/N.
• Squelch sensitivity
(at threshold)
: Less than –15 dBµ
• Selectivity
:
FM, AM
More than 12 kHz/6 dB
Less than 30 kHz/60 dB
WFM
More than 150 kHz/10 dB
Less than 700 kHz/20 dB
• Spurious image rejection
: More than 40 dB
• Audio output power
: More than 50 mW at 10%
distortion with an 8 Ω load
All stated specifi cations are subject to change without notice or obligation.
2 - 1
CPU
CPU
(IC4: M30220FCRP)
(IC4: M30220FCRP)
PTT detector
PTT detector
(Q14: 2SA1832)
(Q14: 2SA1832)
D/A convertor
D/A convertor
(IC13: BH2220FVM)
(IC13: BH2220FVM)
Reference
Reference
frequency generator
frequency generator
(X1: CR-813 7.325MHz)
(X1: CR-813 7.325MHz)
Reset IC
Reset IC
(IC2: R3112N291A)
(IC2: R3112N291A)
CPU
(IC4: M30220FCRP)
PTT detector
(Q14: 2SA1832)
D/A convertor
(IC13: BH2220FVM)
CTCSS filter
(IC5: LM2904PWR)
Microphone amplifier
(IC8: LMV324IPW)
Reference
frequency oscillator
(X1: CR-813 7.325 MHz)
Reset IC
(IC2: R3112N291A)
Antenna switch circuit
Antenna switch circuit
+3V regulator
+3V regulator
(IC10: R1111N321B)
(IC10: R1111N321B)
PLL IC
PLL IC
(IC18: ADF4110BCPZ)
(IC18: ADF4110BCPZ)
VCO board
VCO board
AF volume
AF volume
(IC7: SM6451B)
(IC7: SM6451B)
AF amplifier
AF amplifier
(IC9: NJM2070M)
(IC9: NJM2070M)
IF IC
IF IC
(IC15: TA31136FNG)
(IC15: TA31136FNG)
1st mixer
1st mixer
(IC16:
(IC16: µPC2757TB)
PC2757TB)
Antenna switching circuit
+3V regulator
(IC10: R1111N321B)
PLL IC*
(IC18: ADF4110BCPZ)
VCO board
* Located under the VCO board
AF volume*
(IC7: SM6451B)
AF power amplifier
(IC9: NJM2070M)
FM IF IC
(IC15: TA31136FNG)
1st mixer
(IC16: µPC2757TB)
• MAIN UNIT (TOP VIEW)
• MAIN UNIT (BOTTOM VIEW)
• PA BOARD
Final amplifier*
Final amplifier*
(Q3: RQA003)
(Q3: RQA003)
Drive amplifier
Drive amplifier
(Q2: 2SC5998)
(Q2: 2SC5998)
Pre drive amplifier
Pre drive amplifier
(Q1: 2SC5006)
(Q1: 2SC5006)
Power amplifier*
(Q3: RQA003)
Drive amplifier
(Q2: 2SC5998)
Pre-drive amplifier
(Q1: 2SC5006)
* Located bottom side of the point.
3 - 1
• Removing the chassis
1 Remove the battery pack.
2 Remove the jack cap A and unscrew the antenna nut B.
3 Remove the dial knob C.
4 Unscrew 2 screws D and lift up the chassis in the direction
of the arrow.
• Removing the MAIN unit and PA board
1 Unscrew 2 screws A, then remove the LCD panel B.
2 Unscrew 5 screws C and dial nut D.
3 Unsolder 2 points E.
5 Incline the chassis as figure below and disconnect the
speaker cable E.
6 Remove the chassis from the front panel.
Chassis
A
B
C
D
Chassis
Front panel
E
MAIN unit
B
C
E
C
C
D
A
C
4 Release the projection F, and remove the MAIN unit.
5 Unsolder 11 points G and remove the PA board from the
MAIN unit.
MAIN unit
F
PA board
G
MAIN unit
(Top side)
4-1 RECEIVE CIRCUITS
4-1-1RF CIRCUITS (MAIN UNIT)
This transceiver has 4 RF circuits to provide wide receiving
range. The received signals from the antenna connector
(CHASSIS; J1) are applied to each RF circuits for the frequency
coverage, and amplified within the frequency coverage.
• While receiving 0.495–76 MHz
The 0.495–76 MHz band signals are passed through the
three low-pass filters (LPF; L32, L34, L39, L42, C284, C290,
C294, C307, C314), then applied to the RF amplifier (Q38)
via the band switches (D30, D43) and LPF or BPF.
The 0.495–30 MHz band signals are passed through the
LPF (L20, C241, C242, C247), the 30–76 MHz signals are
passed through the Bandpass Filter (BPF; D39, L21, L24,
C238, C256) before being applied to the RF amplifier (Q38).
The amplified signals are applied to the 1st mixer (IC16, pin
1) via the band switch (D16).
- 0.495–76 MHz -
• While receiving 76–300 MHz
The 76–300 MHz band signals are passed through two LPFs
(L39, L42, C307, C314) and a couple of High-pass Filter (HPF;
L33, C287, C293) and LPF (L29, L31, C266, C269, C276,
C283, C514, C516), then applied to the RF amplifier (Q42) via
the antenna switching circuit (D35, D38) and the LPF (D53,
L44, C295, C303).
The amplified signals are then applied to the 1st mixer (IC16, pin
1) via the BPF (D27, D28, D31, D36, L10, L11, L22, L23, C208,
C210, C216, C228, C233, C243) and band switch (D21).
- 76–300 MHz -
4 - 1
ST )&