Icom COMMUNICATIONS RECEIVER IC-R3 User manual

SERVICE
MANUAL
COMMUNICATIONS RECEIVER

INTRODUCTION
DANGER
ORDERING PARTS
REPAIR NOTES
This service manual describes the latest service information
for the IC-R3 at the time of publication.
NEVER connect the receiver to anAC outlet or to a DC power
supply that uses more than 16 V. Such a connection could
cause a fire hazard and/or electric shock.
DO NOT expose the receiver to rain, snow or any liquids.
DO NOT reverse the polarities of the power supply when con-
necting the receiver.
DO NOT apply an RF signal of more than 20 dBm (100mW)
to the antenna connector. This could damage the receiver’s
front end.
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>
1140008440 S.IC AK93C10A IC-R3 LOGIC UNIT 5 pieces
8810009560 Screw BT M2 x 6 ZK IC-R3 Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
1. Make sure a problem is internal before disassembling the receiver.
2. DO NOT open the receiver until the receiver 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 receiver is defective.
6. READ the instructions of test equipment thoroughly before connecting equipment to the receiver.
To upgrade quality, all electrical or mechanical parts and
internal circuits are subject to change without notice or oblig-
ation.

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 PLL CRICUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 5
4 - 3 FM-TV CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 6
4 - 4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 8
4 - 5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 8
SECTION 5 ADJUSTMENT PROCEDURES
5 - 1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
5 - 2 PLL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 3
5 - 3 RECEIVER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 5
5 - 4 TFT LCD AND FM-TV UNIT ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 7
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9 - 1 VCO AND RF-B UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
9 - 2 FM-TV UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
9 - 3 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
9 - 4 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 7
SECTION 10 BC-135 OPTIONAL DESKTOP CHARGER INFORMATION
10 - 1 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
10 - 2 DISASSEMBLY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
10 - 3 VOLTAGE DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 2
10 - 4 BOARD LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 3
SECTION 11 BLOCK DIAGRAM
SECTION 12 VOLTAGE DIAGRAM
12 - 1 VCO UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 1
12 - 2 RF-B UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 2
12 - 3 FM-TV UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 3
12 - 4 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 4
12 - 5 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 5

MGENERAL
• Frequency range : 0.495–2450.095 MHz
• Mode : F3, A3, C3F (TV)
• No. of memory channel : 450 channels
• Frequency stability : ±6 ppm max.
(–10˚C to +50˚)
• Tuning steps : 5, 6.25, 10, 12.5, 15, 20,
25, 30, 50, and 100 kHz
• Anntena connector : BNC (50 Ω)
• Power supply requirement :
• Polarity : Negative ground
• Frequency resolution : 5 kHz, 6.25 kHz
• Current drain (at 4.5 V) : (Typical)
• Usable temperature range : –10˚C to +60˚C
( –14˚F to +140˚F)
• Dimensions :
61(W) ×120(H) ×32.9(D) mm;
(projections not included) 213⁄32(W) × 423⁄32(H) × 19⁄32(D) in
• Weight (w/ antenna and battery) : 300 (g); 10.6 (oz)
• External SP connector : 3-conductor 3.5(d) mm
(1⁄8”)/8 Ω
• Video/Audio OUT connector : 3-conductor 3.5(d) mm
(1⁄8”)/8 Ω
MRECEIVER
• Receiver system : Tripple super heterodyne
• Intermediate frequencies : (Unit; MHz)
*130–799.995 MHz and 1321–2099.995 MHz range
*2800–1320.995 MHz and 2100–2450.095 MHz range
• Converter frequency : 1291, 1320 or 1351 MHz
(More than 1150 MHz)
• Sensitivity* : (except spurious points)
* FM and WFM are measured at 12 dB SINAD; AM is measured
at 10 dB S/N.
• Squelch Sensitivity :
• Selectivity :
AM / FM more than 12 kHz/–6dB
less than 30 kHz/–50 dB
WFM more than 150 kHz/–6 dB
• Audio output power : 100 mW typical at 10%
distortion with an 8 Ωload
• Audio output impedance : 8 Ω
1 - 1
SECTION 1 SPECIFICATIONS
All stated specifications are subject to change without notice or obligation.
Frequency (MHz)
0.495 – 1.625
1.625 – 5.0
5.0 – 30.0
30.0 – 76.0
76.0 – 108.0
108.0 – 118.0
118.0 – 136.0
136.0 – 175.0
175.0 – 222.0
222.0 – 330.0
330.0 – 470.0
470.0 – 770.0
770.0 – 800.0
800.0 – 1300.0
1300.0 – 2000.0
2000.0 – 2300.0
2300.0 – 2450.095
FM
—
0.56 µV
0.4 µV
0.56 µV
0.79 µV
1 µV
1.4 µV
2.5 µV
WFM
—
1.8 µV
—
1.8 µV
—
2.5 µV
—
AM
2.5 µV
1.8 µV
—
1.8 µV
—
1.8 µV
—
Battery
3 ×alkaline cell
3 × AA(R6) Ni-Cd
1 × Li-ion
External DC supply
Voltage
DC 4.5 V
DC 3.6 V
DC 3.7 V
DC 3.6–6.3 V
Receiving condition
Rated audio
Standby
Power saved (1:4)
TV reception
LCD lighting
TV sound receiving
Except converter
210 mA
140 mA
65 mA
730 mA
210 mA
Converter area
250 mA
180 mA
75 mA
780 mA
250 mA Frequency (MHz)
0.495 – 1.625
1.625 – 5.0
5.0 – 30.0
30.0 – 76.0
76.0 – 108.0
108.0 – 118.0
118.0 – 136.0
136.0 – 175.0
175.0 – 222.0
222.0 – 330.0
330.0 – 470.0
470.0 – 770.0
770.0 – 800.0
800.0 – 1300.0
1300.0 – 2000.0
2000.0 – 2300.0
2300.0 – 2450.095
FM
—
0.56 µV
0.4 µV
0.56 µV
0.79 µV
1 µV
1.4 µV
2.5 µV
WFM
—
10.0 µV
—
10.0 µV
—
10.0 µV
—
AM
2.5 µV
1.8 µV
—
1.8 µV
—
1.8 µV
—
1ST IF
2ND IF
3RD IF
AM, FM
240.1
26.05
0.450
WFM
240.1
13.25
0.450
C3F (TV)
241.85*1, 238.35*2
58.75
—

SECTION 2 INSIDE VIEWS
2 - 1
•RF, RF-B, VCO AND FM-TV UNITS
•LOGIC UNIT
2nd IF circuit
(FI3: FL-319)
FM-TV UNIT
([OTH-2] only])
RF-B UNIT
VCO UNIT
RF UNIT
CPU system clock
(X1: CR-613)
Power amplifier
(IC3: XC62FP3002MR) DC-DC converter
CPU
(IC1: M38267M8L-256GP)
PLL converter circuit
(IC15: TA31056F)
IC801: MB3776APFV
Q804: 2SK2493
T1: TO-47

9 - 3
9-2 FM-TV UNIT
•TOP VIEW
R33
VIDEO
GND
AFOUT
SIFOUT
GND
IFIN
IC22
C30
C74
C26
C29
C57 R54
R38
R39
R55
R24
C22 L21
L41
C17
R41
CP1
B5415D
C41
C12
R13
R12
R8
R6
R31
C28
C13
C10
R10
C16
R16
R15
R9
R14

1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan S-13703IZ-CD-1
© 2000 Icom Inc.

Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf
Icom IC-R3 _sm00.pdf