SERVICE MANUAL VHF FM TRANSCEIVER 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan S-13815IZ-C1 © 2002 Icom Inc.
INTRODUCTION DANGER This service manual describes the latest service information for the IC-V8000 VHF FM TRANSCEIVER at the time of publication. 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. VERSION SYMBOL SUPPLIED MICROPHONE Asia SEA HM-118N CSA HM-118TN C.S.America CSA-1 USA-3 DO NOT reverse the polarities of the power supply when connecting the transceiver. HM-133V USA-2 U.S.A.
TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS 4 CIRCUIT DESCRIPTION SECTION 4-1 4-2 4-3 4-4 4-5 SECTION SECTION RECEIVER CIRCUITS . . . . . TRANSMITTER CIRCUITS . . PLL CIRCUITS . . . . . . . . . . . POWER SUPPLY CIRCUITS PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1 SPECIFICATIONS ‘ GENERAL • Frequency coverage : Version Receive Transmit [USA] 144.000–148.000 MHz [SEA] 136.000–174.000 MHz* 140.000–150.000 MHz* [CSA] 136.000–174.000 MHz* *Specifications Guaranteed: 144–148 MHz only • Type of emission • Frequency stability • Tuning steps • Antnna connector • Power supply requirement (negative ground) • Number of memory channel • Call channel • Scanning mode • Current drain (approx.
SECTION 2 INSIDE VIEWS • MAIN UNIT AF power amplifier (Q23: RD70HVF1) Antenna switching circuit (D12, D27: XB15A407, D19: XB15A308, D16: HVU131TRF) VCO circuit 2nd IF filter (FI1: CFWS450F, FI2: CFWS450HT) Reference oscillator (X1: CR-659) 1st IF filter (FI3, FI4: FL-310) • LOGIC BOARD System clock (X1: CR-663) CPU (IC7: HD6433876B53H) EEPROM (IC5: HN58X2432TI) Speaker Reset IC (IC4: S-80942ANMP-DD6) 2-1 LOGIC board
SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS • REMOVING THE COVER • REMOVING THE MAIN UNIT 1 Unscrew 4 screws, MP10. 2 Remove the cover in the direction of the arrow. 1 Unscrew 11 screws, MP6, and 2 screws, MP7, and 2 screws, MP4. 2 Unsolder 3 points, A, to remove the antenna connector. 3 Remove the Main unit in the direction of the arrow.
SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT (MAIN UNIT) The signals from the RF circuit are mixed at the 1st mixer (Q19) with a 1st LO signal coming from the VCO circuit to produce a 21.70 MHz 1st IF signal. The 1st IF signal is applied to two crystal filters (FI3 and FI4) to suppress out-of-band signals. The filtered 1st IF signal is applied to the IF amplifier (Q16), then applied to the 2nd mixer circuit (IC4, pin 16).
The AF signals are applied to the AF power amplifier circuit (IC9, pin 1) to obtain the specified audio level. The amplified AF signals, output from pin 4, are applied to the internal speaker (CHASSIS UNIT; SP1) via the speaker jack (J6) when no plug is connected to the external speaker jack (J1). 4-1-6 4-2-2 The audio signals (SHIFT) change the reactance of D2 to modulate an oscillated signal at the VCO (Q6, D4).
4-3 4-3-1 PLL CIRCUITS 4-4 PLL CIRCUIT (MAIN AND LOGIC UNITS) VOLTAGE LINE A PLL circuit provides stable oscillation of the transmit frequency and receive 1st LO frequency. The PLL output compares the phase of the divided VCO frequency to the reference frequency. The PLL output frequency is controlled by the divided ratio (N-data) of a programmable divider.
4-5 PORT ALLOCATIONS 4-5-1 CPU (LOGIC UNIT: IC7) Pin Port number name 1 DETO Input port for the weather alert signal detection. 9 RESET Input port for reset signal. 11 CSHIFT Outputs reference oscillator for the CPU control signal. SCK Outputs serial clock signal to the expander IC (MAIN unit; IC2, pin 3), D/A convertor IC (MAIN unit, IC5, pin 7), etc. SO Outputs serial signals to the D/A convertor IC (MAIN unit; IC5, pin 8),etc. 15 PTT Input port for the [PTT] switch.
4-5-2 D/A CONVERTOR IC (MAIN UNIT: IC5) Pin Port number name 2 3 MOD Description Outputs transmit devetion control signal. SQLATT Outputs attenuator control signal. 10 T1 • Outputs tunable bandpass filter control signal while receiving. • Outputs TX power control signal while transmitting. 11, 23 T2, T3 Output tunable bandpass filter control signals. 14 SQLIN Outputs squelch control signal. 15 DTC Outputs DTCS’s gradient control signal.
SECTION 5 PARTS LIST [LOGIC BOARD] REF NO. ORDER NO. [LOGIC BOARD] REF NO. DESCRIPTION IC1 IC2 IC3 IC4 IC5 IC6 IC7 IC8 1110002860 1130004200 1110005340 1130009110 1130009680 1130008090 1140010400 1130007570 S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.
[LOGIC BOARD] REF NO. ORDER NO. [LOGIC BOARD] REF NO.
[MAIN UNIT] REF NO. [MAIN UNIT] ORDER NO. REF NO. DESCRIPTION D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D20 D21 D22 D23 D24 D25 D26 D27 D28 D29 1750000710 1750000710 1710001060 1750000710 1790000980 1750000550 1710000870 1790000980 1790001250 1710001080 1730000520 1790000700 1790001520 1790001250 1790001250 1790001250 1790001250 1710001060 1790000980 1750000370 S.VARICAP S.VARICAP DIODE S.VARICAP S.DIODE S.DIODE S.DIODE S.DIODE S.DIODE DIODE ZENER DIODE S.ZENER S.DIODE S.DIODE S.DIODE S.DIODE DIODE S.
[MAIN UNIT] REF NO. [MAIN UNIT] ORDER NO. REF NO.
[MAIN UNIT] REF NO. C105 C106 C108 C109 C111 C112 C113 C116 C117 C118 C120 C122 C123 C124 C125 C126 C127 C128 C129 C130 C131 C133 C134 C135 C136 C137 C138 C139 C140 C141 C142 C145 C146 C147 C148 C149 C150 C151 C152 C153 C154 C155 C156 C157 C158 C159 C160 C161 C163 C164 C166 C167 C168 C169 C170 C171 C172 C173 C174 C175 C176 C177 C178 C179 C180 C181 C182 C183 C184 C185 C187 C188 C189 C190 C191 C192 C193 C194 C195 C196 C197 C198 [MAIN UNIT] ORDER NO.
SECTION 6 MECHANICAL PARTS AND DISASSEMBLY 6-1 IC-V8000 [ACCESSORIES] [CHASSIS PARTS] REF. NO. ORDER NO. DESCRIPTION REF. NO. ORDER NO. QTY. QTY.
INTRODUCTION DANGER This service manual describes the latest service information for the IC-V8000 VHF FM TRANSCEIVER at the time of publication. 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. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. DO NOT expose the transceiver to rain, snow or any liquids.
SERVICE MANUAL VHF FM TRANSCEIVER 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan S-13815IZ-C1 © 2002 Icom Inc.
