PRODUCT REVIEW
ICOM IC-V8000 VHF FM Transceiver
Reviewed by Steve Ford, WB8IMY ICOM has gone back to basics with the IC-V8000 transceiver. Gone are the elaborate menus, the multitude of buttons and the endless featuresmost of which you may never use. Instead, the V8000 puts the focus on simplicity, durability and power lots of power. Although it is designed as a 2-meter FM mobile, the V8000 does just as well on your desk (as long as you have a hefty dc power supply handy). The display is large and easy to read. You can vary not only the display brightness, but also the color (amber or green). VOLUME and SQUELCH controls are separate. The tuning knob is sizeable and the speaker is forward firing. There is enough audio power to overcome most mobile noise environments. In fact, one of our reviewers characterized it as deafening. The HM-133V microphone thats packed with the V8000 is particularly nice. Nearly all front-panel operations can also be controlled using the mike keypadeven the squelch level. The 25 buttons on the keypad are translucent and backlit. The key size and spacing is generous. The microphone cable connects to the radio via an RJ45 connector. The mike cable connects to the mike itself with an RJ45 connector as well, making it easy to replace the cord. Extension microphone cables16.4 and 8.2 feet longare available as optional accessories. There are so many functions on the microphone, you could probably store the radio out of sight and use the microphone as the remote front panel. At about 6 inches, the V8000 is relatively compact. But dont let the size fool youthis transceiver is built like a tank. The V8000 has quite a bit of heft at nearly 3 pounds. In fact, its die-cast singlepiece chassis reminded me of several commercial marine radios on the market. offers DTMF TouchTone transmission for autopatch and control functions. DTMF decoding is available as an option. Speaking of tones and decoding, the IC-V8000 makes good use of both audible and subaudible tone decoding for its various tone squelch, pocket beep and paging functions. You can set the V8000 for complex group-calling schemes where, for example, your V8000 will spring to life only when it receives your code or the code of your group. Not many hams will use these functions in normal day-to-day operation, but they are excellent for public service applications. There is one feature in the V8000 that I wish was standard equipment in every FM transceiver. Its called Repeater Lockout and its function is straightforward. When it is active, Repeater Lockout will not allow you to transmit while there is a signal present. Even if you become impatient on the push-to-talk button, the V8000 will not let you interfere. Think of it as a courtesy enforcer. Of course, you have to have the initial courtesy to turn the function on in the first place! Ive already mentioned the ample memory channels. The well-written V8000 manual devotes a number of pages to describing how to program them. In truth, the process is much easier than it appears. It follows the procedures that have become standard in most modern FM radios. I was able to program the V8000 memories without referring to the manual, although I did have to glance at the pages when I tried to transfer the memory contents. Programming the memory channel names (up to 6 alphanumeric characters per channel) also required a little time with the book. If you travel with your V8000, youll be pleased to learn that the memories can be stored in up to 10 different banks of about 20 slots each. You could have one bank of settings for your hometown, another for the city where your buddy lives, and so on. Toggling between the frequency and name display is easyjust a long press of the MON/ANM button. And the choice of showing the frequency or channel name display is independent for each memory position. The memory channels store power output settings, which is very handy. Repeaters that are within easy range can be programmed in with low output power settings. Memory channels for repeaters that are on the fringe can be set up with the higher levels. You can clone memory programming from another V8000, or from a personal computer. The rear-panel external speaker jack functions as a data port in this application. To program from your PC, however, you need an optional ICOM interface and software. When it comes to scanning, the V8000 features the typical full scan (band edge

Bottom Line

ICOMs IC-V8000 packs a substantial RF punch in a no-nonsense package.
Features Repeater input/output offset frequencies are programmable in all of the 207 memory channels, or you can use the auto repeater function to let the V8000 set them automatically. Subaudible tones for repeater access can be programmed and stored in the same manner. The V8000 can even scan for subaudible tones and write them to memory. The V8000 also

Steve Ford, WB8IMY

QST Editor

July 2002 55

Table 1 ICOM IC-V8000, serial number 01825 Manufacturers Claimed Specifications
Frequency coverage: Receive, 136-174 MHz; transmit, 144-148 MHz. Power requirement: Receive, 1.0 A (maximum audio); transmit, 15 A (high power). Modes of operation: FM.

Measured in the ARRL Lab

Receive and transmit, as specified. Receive, 0.8 A; transmit, 12 A. Tested at 13.8 V. As specified.

Receiver

FM sensitivity: 12 dB SINAD, 0.15 V typical. Weather band sensitivity,12-dB SINAD (tested at 162.400 MHz): Not specified. FM adjacent channel rejection: Not specified. FM two-tone, third-order IMD dynamic range: Not specified. FM two-tone, second-order IMD dynamic range: Not specified. S-meter sensitivity: Not specified. Squelch sensitivity: 0.08 V typical. Receiver audio output: 2.0 W at 10% THD into 8. Spurious and image rejection: 75 dB typical.

Receiver Dynamic Range

For 12 dB SINAD, 0.15 V. 0.14 V. 20-kHz channel spacing: 74 dB. 20-kHz channel spacing: 74 dB.* 10-MHz channel spacing: 87 dB. 93 dB. S9 indication: 1.8 V. At threshold: 0.09 V. 2.4 W at 10% THD into 8. First IF rejection, 99 dB; image rejection, 93 dB.

Transmitter

Power output (H/M/ML/L): 75/25/10/5 W (approximately). Spurious-signal and harmonic suppression: 60 dB Transmit-receive turnaround time (PTT release to 50% audio output): Not specified. Receive-transmit turnaround time (tx delay): Not specified. Size (HWD): 2.05.95.9 inches; weight, 2.4 pounds.
Transmitter Dynamic Testing
69 / 26 / 9.3 / 5.0 W. 64 dB. Meets FCC requirements for spectral purity. S9 signal, 168 ms. 130 ms.
*Note: Unless otherwise noted, all dynamic range measurements are taken at the ARRL Lab standard spacing of 20 kHz.
to band edge), programmed scan and memory scan. You can opt to skip channels during a memory scan and adjust the scan-resume conditions for all three scan types. The V8000 receiver covers 136 to 174 MHz, so you can eavesdrop on more than just amateur activity.
Wednesday between 10 AM and noon local time when the NOAA Weather Radio stations run their tests.
Weather Alert One of the most interesting features of the IC-V8000 is the weather channel operation. When this feature is switched on, the V8000 will quickly scan through the NOAA Weather Radio channels every five seconds. The V8000 scans through 10 channels: US162.550, 162.400, 162.475, 162.425, 162.450, 162.500, 162.525 MHz Canada161.650, 161.775, 163.275 MHz If it detects a weather alert tone, the V8000 gets your attention by sounding an alarm and flashing a display message. This is ideal for hams involved in SKYWARN and other severe-weather support activities. You can test the weather channel alarm by switching on your V8000 each

56 July 2002

Power As I stated at the beginning of this review, the V8000 offers more power than you are likely to need. The output is variable from 5 W to 75 W. We found the 5-W setting to be adequate most of the time, but when the going became rough, the 75-W punch made the difference. This is particularly true when you are operating at the fringe of a repeater coverage area, or when operating simplex. We were pleasantly surprised at how cool the V8000 was when running high power. Even after a couple of hours of net operation, the case remained cool to the touch. Thats thanks in large part to the sizeable fan on the rear panel. Our reviewers described the fan noise as moderate. Fan operation is adjustable as part of the V8000 programming. ICOM rates the 75 W output level as approximate. The ARRL Lab measured
69 W with our V8000. In random tests ICOM reported output between 71 and 74 W. Its important to note that you must use a heavy dc power cord, preferably the one supplied by ICOM. This transceiver draws almost 15 A in high-power transmit, so an inadequate power cord may create resistive loss, resulting in lower voltage and lower output. However, it is highly unlikely that you or anyone else will notice a performance difference based on the lack of a few watts of RF. Manufacturer: ICOM America, 2380 116th Ave NE, Bellevue, WA 98004; 425454-8155, fax 425-454-1509; amateur@ icomamerica.com; www.icomamerica. com. Manufacturers suggested list price: $306.65. Typical current street price: $250. List prices of selected optional accessories: CS-V8000 Windows 95/98/ME programming software (on CD ROM), $35; OPC-478 cable for computer to transceiver programming, $45; OPC-474 cable for transceiver to transceiver cloning, $18; OPC-440 microphone extension cable (16.4 feet), $85; UT-108 DTMF decoder unit, $35.

SERVICE MANUAL

VHF FM TRANSCEIVER
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan

S-13815IZ-CIcom Inc.

INTRODUCTION
This service manual describes the latest service information for the IC-V8000 VHF FM TRANSCEIVER at the time of publication.
VERSION Asia C.S.America U.S.A. SYMBOL SEA CSA CSA-1 USA-2 USA-3 HM-118TAN SUPPLIED MICROPHONE HM-118N HM-118TN HM-133V

DANGER

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. 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 (100mW) to the antenna connector. This could damage the transceiver's front end.
To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation.

ORDERING PARTS

Be sure to include the following four points when ordering replacement parts: 1. 2. 3. 4. 10-digit order numbers Component part number and name Equipment model name and unit name Quantity required

REPAIR NOTES

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 50 dB to 60 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.

<SAMPLE ORDER>

1110003200 S.IC TA31136FN IC-V8000 MAIN UNIT 5 pieces 8810006050 Screw Icom screw E7 IC-V8000 Chassis 10 pieces
Addresses are provided on the inside back cover for your convenience.

TABLE OF CONTENTS

SECTION SECTION SECTION SECTION

4-1 4-2 4-3 4-4 4-5

SPECIFICATIONS INSIDE VIEWS DISASSEMBLY AND OPTION INSTRUCTIONS CIRCUIT DESCRIPTION
RECEIVER CIRCUITS. TRANSMITTER CIRCUITS. PLL CIRCUITS. POWER SUPPLY CIRCUITS PORT ALLOCATIONS.4-1.4-2.4-3.4-3.4-4

SECTION SECTION

6-1 6-2
PARTS LIST MECHANICAL PARTS AND DISASSEMBLY

IC-V8000.6-1 HM-133V.6-3

8-1 8-2 8-3
SEMI-CONDUCTOR INFORMATION BOARD LAYOUTS
HM-133V.8-1 LOGIC BOARD.8-2 MAIN UNIT.8-4

BLOCK DIAGRAM

10 VOLTAGE DIAGRAM
10-1 10-2 10-3 MAIN UNIT.10-1 LOGIC BOARD.10-2 HM-133V.10-3

SECTION 1

GENERAL

Frequency coverage

SPECIFICATIONS
: Version [USA] [SEA] [CSA]

Receive

Transmit 144.000148.000 MHz
136.000174.000 MHz* 140.000150.000 MHz* 136.000174.000 MHz*
*Specifications Guaranteed: 144148 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.) : : : : : FM (F2D / F3E) 10 ppm (10C to +60C; +14F to +140F) 5, 10, 12.5, 15, 20, 25, 30 or 50 kHz SO-239 (50 ) 13.8 V DC (Operable voltage range: 11.7 to 15.9 V)
: 207 channels (including 6 scan edges and 1 call channel) : 1 channel : Full, Program, Priority, Memory, Channel, Skip, Tone, DTCS, Bank and WX : High (75 W) 15 A Transmit Middle High (25 W) Middle Low (10 W) Low (5 W) Max. audio Stand-by 9.0 A 6.0 A 5.0 A 1.0 A 0.8 A

3132(H)

Receiving Usable temperature range Dimensions (projections not included) Weight
: 10C to +60C; +14F to +140F : 150(W) 50(H) 150(D) mm; 5 2932(W) 1 : 1.09 kg; 12.3 oz.; 38.4 oz

2932(D)

TRANSMITTER
RF output power (at 13.8 V DC) Modulation system Maximum frequency deviation Spurious emissions Microphone connector : : : : : 75 W / 25 W / 10 W / 5 W (High / Middle High / Middle Low / Low) Variable reactance frequency modulation Narrow: 2.5 kHz*; Wide: 5.0 kHz Less than 60 dB 8-pins modular (600 )

RECEIVER

Receive system Intermediate frequencies Sensitivity Squelch sensitivity Selectivity Spurious and image rejection Audio output power (at 7.2 V DC) Ext. speaker connector *[USA] version only All stated specifications are subject to change without notice or obligation. : Double conversion superheterodyne system : 1st 21.7 MHz 2nd 450 kHz : 0.15 V at 12 dB SINAD (typical) : 0.08 V at threshold (typical) : Narrow; More than 3.0 kHz at 6 dB, Less than 9.0 kHz at 55 dB* Wide; More than 6.0 kHz at 6 dB, Less than 14.0 kHz at 60 dB : 60 dB (typical) : More than 2.0 W at 10% distortion with an 8 load : 3-conductor 3.5(d) mm (18)/8

SECTION 2

MAIN UNIT

INSIDE VIEWS

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)

Speaker
EEPROM (IC5: HN58X2432TI)
Reset IC (IC4: S-80942ANMP-DD6)

LOGIC board

SECTION 3

REMOVING THE COVER

DISASSEMBLY AND OPTION INSTRUCTIONS

REMOVING THE MAIN UNIT

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.
1 Unscrew 4 screws, MP10. 2 Remove the cover in the direction of the arrow.

MP10 MP7 MP4 MP6 MP6

Main unit

Chassis

REMOVING THE FRONT PANEL
5 Unscrew 3 screws, MP9. Unplug J6 to separate front panel and chassis. Remove the front panel in the direction of the arrow. Unplug J5 to separate fan and chassis. Unscrew 2 screws, MP6, to separate MP15 and chassis.
OPTIONAL UNIT INSTALLATION
1 Install the optional unit as illustrated below. Insert it tightly to avoid bad contact.
MP6 J5 (MF1) MP15 J6 (SP7)

Chassis Front panel MP9

SECTION 4

CIRCUIT DESCRIPTION

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).

RECEIVER CIRCUITS

ANTENNA SWITCHING CIRCUIT (MAIN UNIT)
Received signals passed through the low-pass filter (L44, L47, L48, L51, C190, C197, C203, C208, C210, C217, C218). The filtered signals are applied to the 1/4 type antenna switching circuit (D16, D19). The antenna swtiching circuit functions as a low-pass filter while transmitting. However, its impedance becomes very high while D16 and D19 are turn ON. Thus transmit signals are blocked from entering the receiver circuits. The antenna switching circuit employs a 1/4 type diode swtiching system. The passed signals are then applied to the RF amplifier circuit.
2ND IF AND DEMODULATOR CIRCUITS (MAIN UNIT)
The 2nd mixer circuit converts the 1st IF signal to a 2nd IF signal. A double conversion superheterodyne system (which converts receive signal twice) improves the image rejection ratio and obtain stable receiver gain. The 1st IF signal from the IF amplifier is applied to the 2nd mixer section of the FM IF IC (IC4, pin 16), and is mixed with the 2nd LO signal to be converted to a 450 kHz 2nd IF signal. The FM IF IC contains the 2nd mixer, limiter amplifier, quadrature detector and active filter circuits. A 21.25 MHz 2nd LO signal is produced at the PLL circuit. The 2nd IF signal from the 2nd mixer (IC4, pin 3) passes through a ceramic filter (FI1; When wide is selected, F2; When Narrow is selected. (Narrow is [USA] version only.)) to remove unwanted heterodyned frequencies. It is then amplified at the limiter amplifier (IC4, pin 5) and applied to the quadrature detector (IC4, pins 10, 11) to demodulate the 2nd IF signal into AF signals.

RF CIRCUIT (MAIN UNIT)

The RF circuit amplifies signals within the range of frequency coverage and filters out-of-band signals. The signals from the antenna switching circuit are applied to the limitter (D15), and are then passed through the bandpass filter (D13, L43, C183, C182). The filtered signals are amplified at the RF amplifier (Q27), then applied to the 1st mixer circuit after out-of-band signals are suppressed at the bandpass filter (D9D11). D9D11, D13 employ varactor diodes that track the bandpass filters and are controlled by the T1T3 signals from the D/A convertor (IC5, pins 10, 11, 23). These diodes tune the center frequency of an RF passband for wide bandwidth receiving and good image response rejection.

4-1-5 4-1-3 1ST MIXER AND 1ST IF CIRCUITS (MAIN UNIT)
AF CIRCUIT (MAIN AND LOGIC UNITS)
The AF amplifier circuit amplifies the demodulated AF signals to drive a speaker. AF signals from the FM IF IC (IC2, pin 9) are applied to the analog swtich (LOGIC UNIT; IC6, pin 1) via the high pass filter (IC3c, pins 9, 8). The output signals from pin 11 are applied to the volume adjustment pot (LOGIC UNIT; R31). The signals are applied to the AF power amplifier (IC9, pin 1) after passing through the AFmute swtich (Q29).
2nd IF filter 450 kHz CNoise detector Limiter amp. RSSI 5 Noise comp. Mixer X1 21.25 MHz FI2 LPF 16 PLL IC IC1 1
The 1st mixer circuit converts the received signal to a fixed frequency of the 1st IF signal with a PLL output frequency. By changing the PLL frequency, only the desired frequency will pass through two crystal filters at the next stage of the 1st mixer.
2ND IF AND DEMODULATOR CIRCUITS

C84 R59 RR55

Active filter "SQLIN" signal from the D/A convertor (IC5, pin 214 FM detector 9 AF signal "DETO" R71 C105 C101

IC4 TA31136F

10 CR73 R5V X2 R1st IF from the IF amplifier (Q16) "NOIS" signal to the CPU pin 19 "SD" signal to the CPU pin 97
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).
MODULATION CIRCUIT (MAIN UNIT)
The modulation circuit modulates the VCO oscillating signal (RF signal) using the microphone audio signals. The audio signals (SHIFT) change the reactance of D2 to modulate an oscillated signal at the VCO (Q6, D4). The oscillated signal is amplified at the LO (Q9) and buffer (Q11) amplifiers, then applied to the TX/RX switch circuit (D6, D7).
SQUELCH CIRCUIT (MAIN AND LOGIC UNITS)
A squelch circuit cuts out AF signals when no RF signals are received. By detecting noise components in the AF signals, the squelch switches the analog swtich. A portion of the AF signals from the FM IF IC (IC4, pin 9) are applied to the D/A converter (IC5, pin 13) as the DETO signal. The signals from the D/A converter (IC5, pin 14) are applied to the FM IF IC active filter section (IC4, pin 8) where noise components are amplified and detected with an internal noise detector via the SQLIN line. The trigger circuit converts the detected signals to a HIGH or LOW signal and applies this (from pin 13) to the CPU (LOGIC UNIT; IC7, pin 19) as the NOIS signal.The CPU controls the analog swtich IC (LOGIC UNIT; IC6) via the expander IC (LOGIC UNIT; IC8). When the CPU receives a HIGH level NOIS signal, the CPU controls the RMUT line to cut the AF signals at the analog swtich IC (LOGIC UNIT; IC6). At the same time, the AFON line controls the AF mute circuit (Q29) to cut out the VOLOUT signal for the AF power amplifier (IC9).

DRIVE/POWER AMPLIFIER CIRCUITS (MAIN UNIT)
The signal from the VCO circuit passes through the TX/RX swtiching circuit (D6) and is amplified at the pre-drive (Q17), drive (Q18, Q20) and power (Q23) amplifiers to obtain 75 W of RF power (at 13.8 V DC/typical). The amplified signal passes through the low-pass filter (L37, L39, C151, C156, C159, C167, C176, C227C229), and then applied to the antenna swtiching circuit (D12). The signal is applied to the antenna connector (CHASSIS UNIT; J1) after being passed through the low-pass filter (L44, L47, L48, L51, C190, C197, C203, C208, C210, C217, C218). The bias current of the drive (Q18, Q20) and power (Q23) amplifiers is controlled by the APC circuit to stabilize the output power.

APC CIRCUIT (MAIN UNIT)

The APC (Automatic Power Control) circuit (IC6a, Q26) protects drive and power amplifiers from excessive currents and selects HIGH or LOW output power. The output voltage from the power detector circuit (D14, D17) is applied to the differential amplifier (IC6a, pin 2), and the T3 signal from the D/A converter (IC5, pin 23) is applied to the other input for reference. When the driving current increases, the input voltage of the differential amplifier (IC6a, pin 2) will be increased. In such cases, the differential amplifier output voltage (pin 1) is decreased to reduce the drive current. Q26 is controlled by the TXC signal from the expander IC (IC2, pin 14) to select HIGH or LOW output power.

TRANSMITTER CIRCUITS

MICROPHONE AMPLIFIER CIRCUIT (LOGIC AND MAIN UNITS)
The microphone amplifier circuit amplifies audio signals with +6 dB/octave pre-emphasis from the microphone to a level needed for the modulation circuit. The AF signals from the microphone pass through the MIC switch (IC2, D4) and high-pass filter (IC3a, pin 2), and are then applied to the microphone amplifier circuit (IC3d, pin 12) via the R39 and C47 for +6 dB/octave pre-emphasis. The amplified AF signals are applied to the analog swtich (IC6, pin 4), and are then applied to the D/A converter (MAIN UNIT; IC5, pin 1) via the MODIN signal. The AF signals are applied to the modulator circuit via the MOD signal.

APC CIRCUIT

HV SWHV Q18 Driver amp. Q20 Driver amp. Q23 Power amp. L44, C190, C191, C196, C197 ANT SW D14 LPF D12 to antenna

RF signal from PLL IC (IC1)

+5V TXC Q26 T+ 2 IC6a 1

Power detector circuit (D12, D14)

APC control circuit

PLL CIRCUITS
PLL CIRCUIT (MAIN AND LOGIC UNITS)

LINE HV

POWER SUPPLY CIRCUITS
DESCRIPTION The voltage from the power supply. The same voltage as HV line which is controlled by the HVSW circuit (Q28, Q30, Q31). When the [POWER] switch is pushed, the CPU outputs the PWRON control signal via the expander IC (IC2). The signal is applied to the HVSW circuit to turn the circuit ON. The output voltage is applied to the drive amplifier (Q18), +8V regulator circuit (IC7), etc. Common 5 V for the CPU converted from the HV line by the C5V regulator circuit (IC8). The circuit outputs the voltage regardless of the power ON/OFF condition. The output voltage is applied to the EEPROM (LOGIC UNIT; IC5), CPU (LOGIC UNIT; IC7), etc. Common 8 V converted from the 13.8 V line by the +8V regulator circuit (IC7). The output voltage is applied to the LO (Q9) and buffer (Q11) amplifiers, etc. Common 5 V converted from the +8 V line by the +5V regulator circuit (Q21, Q22). Transmit 8 V controlled by the T8V regulator circuit (Q14, Q15) using the TXC signal from the I/O expander IC (IC2). Receive 5 V controlled by the R5V regulator circuit (Q25) using RXC signal from the I/O expander IC (IC2). The output voltage is applied to the FM IC IC (IC4), IF (Q16) and RF (Q27) amplifiers, etc.

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. An oscillated signal from the TX and RX-VCO circuits passes through the LO and buffer amplifiers (Q9, Q12) is applied to the PLL IC (IC1, pin 6) and is prescaled in the PLL IC based on the divided ratio (N-data). The reference signal is generated at the reference oscillator (X1) and is also applied to the PLL IC. The PLL IC detects the out-of-step phase using the reference frequency and outputs it from pin 15. The output signal is passed through the loop filter(Q2) and is then applied to the TX and RX-VCO circuits as lock voltage. The lock voltage is also used for the receiver tunable bandpass filters to match the filters center frequency to the desired receive frequency. The lock voltage is passed through the loop filter (Q2), and then applied to the DC amplifier (Q10). The amplified signal is applied to the CPU (LOGIC unit; IC7, pin 98) via the LVIN signal. The signal is analyzed at the CPU, and then applied to bandpass filters (D9D11, D13) as T1, T2, T3 signals via the D/A converter.

VCO CIRCUIT (MAIN UNIT)

The VCO circuit contains a separate TX-VCO (Q6, D2, D4) and RX-VCO (Q7, D5). The oscillated signal is amplified at the LO (Q9) and buffer (Q11) amplifiers, and is then Tx/Rx switching circuit (D6, D7). Then Tx and Rx signals are applied to the pre-driver (Q17) and 1st mixer circuit (Q19) respectively. A portion of the signal from LO amplifier (Q9) is amplified at the buffer amplifier (Q12) and is then fed back to the PLL IC (IC1, pin 6) as the comparison signal.

PLL CIRCUIT

TX VCO Q6, D2, D4 RX VCO Loop filter QQ7, D5 IC1 (PLL IC) Phase detector Programable divider Prescaler PLLCK PLLDATA PLLSTB to transmitter circuit Q11 Buff. Q9 LO Q12 Buff. D7 TX/RX switch D6 to 1st mixer circuit (Q19)

X1 25.25 MHz 1

Reference divider

Shift register

25.25 MHz 2nd LO signal to the 2nd IF IC (IC4, pin 2)

PORT ALLOCATIONS

CPU (LOGIC UNIT: IC7)
Description Input port for the weather alert signal detection. Input port for reset signal. Outputs reference oscillator for the CPU control signal. Outputs serial clock signal to the expander IC (MAIN unit; IC2, pin 3), D/A convertor IC (MAIN unit, IC5, pin 7), etc. Outputs serial signals to the D/A convertor IC (MAIN unit; IC5, pin 8),etc. Input port for the [PTT] switch. High : While [PTT] switch is pushed. Input port for the cloning signal. Outputs the cloning signal. Input port for noise signals (pulse type). Outputs LCD back light color control signal. Low : While choosing umber color. Outputs LCD contrast control signal. Input port for the remote signals from a remote microphone (HM-133V) via the [MIC] jack. Input port for PLL unlock signal from the PLL IC (MAIN unit; IC1, pin 14). Outputs LCD common signals. Input port for initial matrix. Low : While keys are pushing. SD LVIN PDET TEMP Pin Port number name ESCK ESDA SEG1 SEG32 CTCC TONE SQLV Description Outputs EEPROM (LOGIC unit; IC5, pin 6) clock signal. I/O port for the data signals from/to the EEPROM (LOGIC unit; IC5, pin 5). Output LCD driver signals. Outputs CTCSS and DTCS tone signal. Outputs DTMF, BEEP and 1750 Hz tone signal. Input port for the squelch level detection. Input port for the microphone up/down signal while connecting the microphone. Input port for the RSSI detection. Input port for the PLL lock voltage. Input port for the power detector voltage. Input port for the transceivers internal tempareture detection.
Pin Port number name 11 DETO RESET CSHIFT

SO PTT CLIN CLOUT NOIS

COLOR DIM1 DIM0 REMO

26 3235

UNLK COM4 COM1 KR3 KR0
Input port for the remote control microphone (HM-133V) connecting detecEXTMIC tion. Low : While HM-133V is connected. OPV2 PLLSTB PLLCK Input port for the optional unit detection signal. Outputs strobe signals to the PLL IC (IC1, pin 4). Outputs PLL IC (IC1, pin 2) clock signal. Outputs strobe signal to the expander IC (IC2, pin 1). Input port for the optional unit detection signal. I/O port for optional unit control signal. Outputs low-pass filter cut-off frequency control signal when DTCS is activated.

EXSTB OPV3 OPT1 OPT3 DUSE
D/A CONVERTOR IC (MAIN UNIT: IC5)
Description Outputs transmit devetion control signal.

Pin Port number name MOD

SQLATT Outputs attenuator control signal. Outputs tunable bandpass filter control signal while receiving. Outputs TX power control signal while transmitting. Output tunable bandpass filter control signals. Outputs squelch control signal. Outputs DTCSs gradient control signal. Outputs reference frequency control signal to X1.

11, 15 22

T2, T3 SQLIN DTC FC
I/O EXPANDER IC (MAIN UNIT: IC2)
Description Outputs cooling fan control signal. The fan speed is depended as shown below.

Pin Port number name

FANC1 FANC FANC2
Fan speed FANC Hi Middle Low H H H

FANC1 H L H

FANC2 H H L

AFMUTE

Outputs AF mute circuit control signal. High : While AF mute is ON. Outputs TX and RX VCOs regulator control signals. High : While receiving. Low : While transmitting. Outputs R5 regulator control signal. Low : While receiving. Outputs TX power control signal. High : While transmitting.

RXC TXC

SECTION 5 PARTS LIST

[LOGIC BOARD]

REF NO.
IC1 IC2 IC3 IC4 IC5 IC6 IC7 IC8

DESCRIPTION REF NO.

R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 R60 R61 R62 R64 R67 R69 R70 R71 R72 R73 R74 R75 R76 R77 R78 R79 R80 R81 R82 R83 R84 R85 R86 R87 R89 R91 R92 R93 R94 R96 R97 R99 R100 R101 R102 R103 R104

ORDER NO.

S.IC S.IC S.IC S.IC S.IC S.IC S.IC S.IC
7030003610 S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.ARRAY S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.ARRAY S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR

[USA] [USA] [USA] [USA]

only only only only

FI1 FI2 FI3 FI4

[USA] only 2010002420 2010002420
CERAMIC CERAMIC MONOLITH MONOLITH
CFWLA450KFFA-B0 (CFWS450F) CFWLA450KHFA-B0 (CFWS450HT) 21R15AB (FL-310) 21R15AB (FL-310)
6050010800 S.XTAL CR-659 (21.25 MHz) 6070000200 DISCRIMINATOR CDBLA450KCAY24-B0
L1 L2 L3 L6 L7 L8 L9 L10 L11 L12 L13 L14 L15 L18 L19 L20 L21 L22 L23 L24 L25 L26 L27 L28 L30 L31 L32 L33 L34 L35 L37 L38 L39 L40 L42 L43 L44 L45 L46 L47 L48 L50 L51 L52 L53

6200005710

S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL COIL COIL COIL S.COIL S.COIL S.COIL COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL S.COIL
MLF1608D R82K-T NL 252018T-R82J ELJFC 1R0K-F C2012C-R10G C6342A-88NG-A ELJFC 2R7K-F ELJFC 3R3K-F ELJFC 1R0K-F ELJRE R10G-F ELJRE R10G-F ELJRE R10G-F ELJRE 56NG-F ELJRE 82NG-F ELJRE 47NG-F MLF1608A 2R2K-T ELJRE 47NG-F ELJRE R10G-F ELJRE 68NG-F ELJRE 15NG-F EXCCL3225U1 NL 252018T-2R2J NL 252018T-2R2J EXCCL3225U1 0.30-1.7-8TL 60N 0.30-0.9-3TR 7.5N C2012C-68NG C2012C-68NG EXC-ELDR25C EXC-ELDR25C LA-254 AS100340-10N C2012C-R10G AS080547-47N LW-19 ELJFC R82K-F 0.30-2.0-7TL 68N AS080547-47N 0.35-1.6-7TL 44N AS080647-56N AS080747-68N AS080747-68N NL 252018T-R27J AS080547-47N NL 252018T-R12J ELJRE 27NG-F
7030003640 S.RESISTOR 7030003560 S.RESISTOR
ERJ3GEYJ 473 V (47 k) ERJ3GEYJ 103 V (10 k)
R76 R78 R79 R81 R82 R83 R84 R88 R90 R92 R93 R95 R96 R98
R101 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R117 R118 R119 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R133 R134 R135 R136 R137 R138 R139 R140 R150 R151 R152 R153 R154 R155 R156 R157 R161 R162 R163 R164 R165 R166 R167 R168 R169 R170 R171 R172 R173 R174 R175 R176
S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR S.RESISTOR ERJ3GEYJ 224 V (220 k) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 334 V (330 k) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 103 V (10 k) ERJ3GEYJ 184 V (180 k) ERJ3GEYJ 222 V (2.2 k) ERJ3GEYJ 392 V (3.9 k) ERJ3GEYJ 102 V (1 k) ERJ3GEYJ 101 V (100 ) ERJ3GEYJ 333 V (33 k) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 473 V (47 k) ERJ3GEYJ 103 V (10 k) ERJ3GEYJ 103 V (10 k) ERJ3GEYJ 224 V (220 k) ERJ3GEYJ 102 V (1 k) MCR50JZHJ 10 (100) ERJ3GEYJ 473 V (47 k) ERJ3GEYJ 682 V (6.8 k) ERJ3GEYJ 822 V (8.2 k) MCR10EZHJ 4.7 (4R7) ERJ3GEYJ 822 V (8.2 k) ERJ3GEYJ 124 V (120 k) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 273 V (27 k) ERJ3GEYJ 823 V (82 k) ERJ3GEYJ 473 V (47 k) ERJ3GEYJ 102 V (1 k) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 123 V (12 k) [USA] ERJ3GEYJ 123 V (12 k) [USA] ERJ3GEYJ 123 V (12 k) [USA] ERJ3GEYJ 123 V (12 k) [USA] ERJ3GEYJ 153 V (15 k) [USA] ERJ3GEYJ 153 V (15 k) [USA] ERJ12YJ101U (100 ) ERJ12RSJR15U ERJ3GEYJ 390 V (39 ) ERJ3GEYJ 151 V (150 ) ERJ3GEYJ 151 V (150 ) ERJ3GEYJ 272 V (2.7 k) [USA] ERJ3GEYJ 473 V (47 k) [USA] ERJ3GEYJ 473 V (47 k) [USA] ERJ3GEYJ 333 V (33 k) ERJ3GEYJ 273 V (27 k) MCR10EZHJ 56 (560) MCR10EZHJ 56 (560) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 103 V (10 k) ERJ3GEYJ 104 V (100 k) ERJ3GEYJ 151 V (150 ) ERJ3GEYJ 390 V (39 ) ERJ3GEYJ 151 V (150 ) ERJ3GEYJ 102 V (1 k) [USA] ERJ3GEYJ 104 V (100 k) [USA] ERJ3GEYJ 103 V (10 k) ERJ3GEYJ 101 V (100 ) ERJ3GEYJ 473 V (47 k) ERJ3GEYJ 102 V (1 k)

4030007020 4030006860

C200 C201 C203 C204 C205 C206 C207 C208 C209 C210 C211 C212 C213 C214 C215 C216 C217 C218 C219 C222 C224 C225 C227 C228 C229 C230 C232 C233 C234 C235 C237 C238 C239 C240 C241 C242 C243 C244 C245
4030008680 S.CERAMIC S.CERAMIC S.CERAMIC S.ELECTROLYTIC S.CERAMIC S.CERAMIC ELECTROLYTIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.ELECTROLYTIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.ELECTROLYTIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC S.CERAMIC
C1608 JB 1H 102K-T-A C1608 CH 1H 180J-T-A ERF22X 6C2H 470J D01L ECEV1AA471UP C1608 JB 1H 102K-T-A GRM31M3C2H3R0CY21L (GRM42-6 CJ) 16 MV 2200 HC GRM31M2C2H330JV01L (GRM42-6 CH) C1608 JB 1E 104K-T-N GRM31M2C2H150JV01L (GRM42-6 CH) C1608 JB 1H 102K-T-A C1608 JB 1H 102K-T-A C1608 JB 1H 102K-T-A ECEV1CA470SP C1608 JB 1E 104K-T-N C1608 JB 1E 104K-T-N GRM31M2C2H470JV01L (GRM42-6 CH) GRM31M2C2H220JV01L (GRM42-6 CH) C1608 CH 1H 090D-T-A C1608 JB 1H 103K-T-A C1608 JB 1E 104K-T-N GRM31BR32J102KY01L (GHM1030 R) GRM31M2C2H101JV01L (GRM42-6 CH) GRM31M2C2H390JV01L (GRM42-6 CH) GRM31M2C2H390JV01L (GRM42-6 CH) ECEV1CA100SR [USA] only C1608 JB 1H 102K-T-A [USA] only C1608 JB 1E 104K-T-N [USA] only C1608 CH 1H 181J-T-A C1608 CH 1H 331J-T-A C1608 CH 1H 020C-T-A C1608 JB 1H 102K-T-A C1608 JB 1E 104K-T-N C1608 JB 1H 102K-T-A C1608 JB 1E 104K-T-N C1608 JB 1H 102K-T-A C1608 CH 1H 060D-T-A C1608 JB 1E 104K-T-N C2012 JF 1C 105Z-T-A

J1 J2 J4 J5 J6

6510014960
CONNECTOR CONNECTOR CONNECTOR S.CONNECTOR S.CONNECTOR
52330-1217 52330-1217 PJ-0008P-5 <AI> B2B-ZR-SM3-TF B2B-ZR-SM3-TF

W1 W2 W3 W5 W6

8900010980
S.JUMPER S.JUMPER S.JUMPER JUMPER CABLE
ERJ3GE JPW V ERJ3GE JPW V ERJ3GE JPW V ERDS2T0 OPC-1131
[SEA], [CSA] only [SEA], [CSA] only

EP1 EP2 EP3

6910012350 S.BEAD 6910012350 S.BEAD 0910055322 PCB
MMZ1608Y 102BT MMZ1608Y 102BT B 5800B

SECTION 6

6-1 IC-V8000

[CHASSIS PARTS]

REF. NO. ORDER NO. J1 MF1 MP1 MP2 MP3 MP4 MP5 MP6 MP7 MP9 MP10 MP11 MP14 MP15 MP16 MP17
MECHANICAL PARTS AND DISASSEMBLY

[ACCESSORIES]

DESCRIPTION QTY. REF. NO. ORDER NO. F1 MCFuse (20A) Microphone Microphone Microphone Microphone HM-133 ACC [CSA-1], [USA-2] HM-118TN ACC [CSA] HM-118N ACC [SEA] HM-118TAN ACC [USA-3] DESCRIPTION QTY. 1

6510004880 Connector MR-DSE-Fan DF125020BH 2509 Chassis-Fan holder 2509 Cover Screw BT M3 x 8 NI-ZU (BT) Screw BT M3 x 8 NI-ZU (BT) Screw BT M3 x 8 NI-ZU (BT) Screw H M2.6 x 8 Hex socket bolt M3 x 20 ZK Screw M2.6 x 6 ZK Thermally sheet (C) Screw M3 x 30 ZK 2509 Shield plate Rubber sheet (BA) Sheet (BZ)
W1 MP1 MP2 MP3 MP4 MP5 MP6 MP7 MP8 MP9
8900010990 Cable OPC-1132 ACC Mobil bracket 452 Felt Flange bolt M4 x 8 Screw A0 M5 x 16 Flat washer M5 SUS Spring washer M5 SUS Screw M5 x 12 (+/) Nut M5 SUS MIC hanger
REF. NO. ORDER NO. DS19 S9 SP1 WS1 EP9 MP1 MP2 MP3 MP4 MP5 MP6 MP7 MP8 MP9 MPL1-0256TAM 2250000370 Encoder EVQ-VENF01 24B 2510001150 Speaker 045PFX2509 P01LLCD contact SRCN-2509-SP-N-W 2509 Front panel 2509 LCD filter 2509 Reflectort 2509 A-keyboard 2509 B-keyboard 2509 C-keyboard 2509 Front plate Knob N-267-2 Knob N-291 Screw B0 M2 x 8 NI-ZU (BT) DESCRIPTION QTY. 4 MP9 F1 MC1* W1 MP1
*The illustration is the HM-133V.

Screw abbreviations

A0, B0, BT: Self-tapping NI-ZU: Nickel-Zinc ZK: Black SUS: Stainless
REF. NO. ORDER NO. W6 MP1 MP2 MP3 DESCRIPTION QTY. 8900010980 Cable OPC-2399 Heatsink VCO case VCO cover
This service manual describes the latest service information for the IC-V8000 VHF FM TRANSCEIVER at the time of publication. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation.