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SERVICE
MANUAL
VHF FM TRANSCEIVER
INTRODUCTION DANGER
This service manual describes the latest service information NEVER connect the transceiver to an AC outlet or to a DC
for the IC-V8000 VHF FM TRANSCEIVER at the time of pub- power supply that uses more than 16 V. This will ruin the
lication. transceiver.
VERSION SYMBOL SUPPLIED MICROPHONE DO NOT expose the transceiver to rain, snow or any liquids.
Asia SEA HM-118N
CSA HM-118TN DO NOT reverse the polarities of the power supply when
C.S.America connecting the transceiver.
CSA-1
HM-133V
USA-2 DO NOT apply an RF signal of more than 20 dBm (100mW)
U.S.A.
USA-3 HM-118TAN to the antenna connector. This could damage the trans-
ceiver's front end.
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
ORDERING PARTS REPAIR NOTES
Be sure to include the following four points when ordering 1. Make sure a problem is internal before disassembling
replacement parts: the transceiver.
2. DO NOT open the transceiver until the transceiver is dis-
1. 10-digit order numbers connected from its power source.
2. Component part number and name 3. DO NOT force any of the variable components. Turn
3. Equipment model name and unit name them slowly and smoothly.
4. Quantity required 4. DO NOT short any circuits or electronic parts. An insulat-
ed turning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the trans-
ceiver is defective.
1110003200 S.IC TA31136FN IC-V8000 MAIN UNIT 5 pieces 6. DO NOT transmit power into a signal generator or a
8810006050 Screw Icom screw E7 IC-V8000 Chassis 10 pieces sweep generator.
7. ALWAYS connect a 50 dB to 60 dB attenuator between
Addresses are provided on the inside back cover for your the transceiver and a deviation meter or spectrum ana-
convenience. lyzer when using such test equipment.
8. READ the instructions of test equipment thoroughly
before connecting equipment to the transceiver.
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPTION
4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4-4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4-5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS AND DISASSEMBLY
6-1 IC-V8000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
6-2 HM-133V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUTS
8-1 HM-133V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
8-2 LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
8-3 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4
SECTION 9 BLOCK DIAGRAM
SECTION 10 VOLTAGE DIAGRAM
10-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1
10-2 LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2
10-3 HM-133V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3
SECTION 1 SPECIFICATIONS
` GENERAL