Icom IC-V8 User manual
INTRODUCTION
DANGER
ORDERING PARTS
REPAIR NOTES
This service manual describes the latest service information
for the IC-V8 at the time of publication.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 10.3 V. Such a connection
could cause a fire hazard and/or electric shock.
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 (100mW)
to the antenna connector. This could damage the transceiv-
er’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>
0910053802 PCB B-5649B IC-V8 MAIN UNIT 1 pieces
8810009560 Screw BT M2 x 6 ZK IC-V8 Chassis 10 pieces
8810009510 Screw BT 2 x 4 NI IC-V8 Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
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 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 40 dB to 50 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 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 TRANSMITTER CIRCUITS ............................................................................................ 4 - 2
4 - 3 PLL CIRCUIT................................................................................................................... 4 - 3
4 - 4 OTHER CIRCUITS.......................................................................................................... 4 - 3
4 - 5 POWER SUPPLY CIRCUITS ......................................................................................... 4 - 3
4 - 6 CPU PORT ALLOCATIONS ........................................................................................... 4 - 4
SECTION 5 ADJUSTMENT PROCEDURES
5 - 1 PREPARATION................................................................................................................ 5 - 1
5 - 2 PLL ADJUSTMENT.......................................................................................................... 5 - 2
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9 - 1 MAIN UNIT....................................................................................................................... 9 - 1
SECTION 10 BC-146 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 LAYOUT........................................................................................................... 10 - 2
SECTION 11 BLOCK DIAGRAM
SECTION 12 VOLTAGE DIAGRAM
SECTION 1 SPECIFICATIONS
1 - 1
‘‘GENERAL
• Frequency coverage :
*Specifications Guaranteed: 144–148 MHz only
• Type of emission : F2D/ F3E
• Frequency stability : ± 10 ppm
(–10˚C to +60˚C; +14˚F to +140˚F)
• Tuning steps : 5, 10, 12.5, 15, 20, 25, 30 or 50 kHz
• Antnna connector : BNC (50 Ω)
• Power supply requirement : 7.2 V DC (Operable voltage range: 6.0 to 10.3 V)
(negative ground)
• Number of memory channel : 100 channels
• Call channel : 1 channel
• Scanning mode : Program, Memory, Skip, Priority or Tone
• Current drain (approx.) : Transmit at High (5.5 W) 2.0 A
at Low (0.5 W) 0.7 A
Receive Max. audio 250 mA
stand-by 70 mA
power saved 20 mA
• Usable temperature range : –10˚C to +60˚C; +14˚F to +140˚F
• Dimensions (projections not included) : 54(W) × 132(H) × 35(D) mm; 2 1⁄8(W) × 5 3⁄16(H) × 1 3⁄8(D) in.
•Weight (with ant., BP-222) : 350 g; 12.3 oz.
‘‘TRANSMITTER
•RF output power (at 7.2 V DC) : 5.5 W / 0.5 W (High / Low)
(with supplied battery pack)
•Modulation system : Variable reactance frequency modulation
•Maximum frequency deviation : ±5.0 kHz
•Spurious emissions : Less than –60 dB
•Ext. microphone connector : 3-conductor 2.5(d) mm (1⁄10”)/2.2 kΩ
‘‘RECEIVER
•Receive system : Double conversion superheterodyne system
•Intermediate frequencies : 1st 21.7 MHz
2nd 450 kHz
•Sensitivity : 0.16 µV at 12 dB SINAD (typical)
•Squelch sensitivity : 0.1 µV at threshold (typical)
•Adjacent channel selectivity : 65 dB (typical)
•Spurious response rejection : 75 dB (typical)
•Intermodulation rejection ratio : 65 dB (typical)
•Audio output power (at 7.2 V DC) : More than 300 mW at 10% distortion with an 8 Ωload
•Ext. speaker connector : 3-conductor 3.5(d) mm (1⁄8”)/8 Ω
All stated specifications are subject to change without notice or obligation.
Receive
136.000–174.000 MHz*
Transmit
144.000–148.000 MHz
136.000–174.000 MHz*
Version
[USA]
[GEN]
2-1
SECTION 2 INSIDE VIEWS
Power amplifier
(Q1: 2SK3476)
Antenna swtching circuit
(D2, D8: MA77)
Antenna swtching circuit
(D1: MA77)
TOP VIEW BOTTOM VIEW
RF amplifier
(Q12: 3SK274)
VCO circuit
1st mixer
(Q13: 3SK274)
TX/RX switch
(D3, D4: MA77)
APC
IC3A: NJM12902V
Q37: DTA144EU
FM IF IC
(IC2:TA31136FN)
CPU
(IC8: HD6473877H)
EEPROM
(IC7: BR24C16FV)
D/A converter
(IC10: M62363FP)
PLL reference oscillator
(X1: CR-659 21.25 MHz)
Crystal filter
FI1, Fl3:FL-298
21.700 MHz
PLL IC
(IC1:LV2105V)
IF amplifier
(Q14: 2SC4406)
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