Icom IC-F7000 service manual RF Circuit MAIN, PA, PLL Units and DRI, VER Board, RF Filter Circuit

Page 15

4-2-5 RF CIRCUIT (MAIN, PA, PLL UNITS AND DRI-

• 2.5–3.49999 MHz signals

VER BOARD)

 

 

The signals are applied to the relay (FILTER unit; RL7061).

The RF circuit amplifies operating (transmitting) frequency

The signals pass through the low-pass filter (FILTER unit;

to obtain 100 W (125 W: 1.6–4 MHz for [OTH]) of RF output.

L7067, L7068, C7072, C7073, C7077–C7083), and are then

 

 

 

 

applied to the RL7062 which is controlled by the band con-

The RF signals from the 1st mixer circuit pass through the

trol IC (MAIN unit; IC3602) as the “L2M” signal via the buffer

low-pass filter (L702, L703, C706, C707, C709–C711,

amplifier (MAIN unit; IC1301, pin 14).

C721), and are then applied to the RF amplifier (Q701).

 

 

• 3.5–5.49999 MHz signals

The amplified signals pass through one of the low-pass filter

or bandpass filters (Refer to page 4-1 bandpass filters

The signal is applied to the relay (FILTER unit; RL7091). The

used), and are then applied to the YGR amplifier (IC1, pin 1)

signals pass through the low-pass filter (FILTER unit; L7096,

after being passed through the attenuator (R5–R7). The

L7097, C7094–C7099, C7105–C7107), and are then

amplified signals pass through the low-pass filter (L1–L3,

applied to the RL7092 which is controlled by the band con-

C1–C7) and attenuator (R1–R3), and are then applied to

trol IC (MAIN unit; IC3602) as the “L4M” signal via the buffer

the PA unit via J1.

 

 

amplifier (MAIN unit; IC1301, pin 15).

The signals that applied from the MAIN unit are amplified at

• 5.5–8.9999 MHz signals

2 amplifiers (PA unit; Q6101 and Q6801). A part of output

The signals are applied to the relay (FILTER unit; RL7121).

signals from 2 amplifiers are applied to these amplifiers to

The signals pass through the low-pass filter (FILTER unit;

improve the frequency characteristic by feedback. The

L7127, L7128, C7123, C7126–C7131), and are then applied

amplified signals are applied to the drive amplifier (DRIVER

to the RL7122 which is controlled by the band control IC

board; Q6851) via the J6301 as “DRVI” signal. The signals

(MAIN unit; IC3602) as the “L6M” signal via the buffer ampli-

from the DRIVER board pass through the impedance con-

fier (MAIN unit; IC1301, pin 16).

verter (PA unit; L6301), and then applied to push-pull ampli-

• 9–14.9999 MHz signals

fiers (PA unit; Q6401, Q6402) to obtain a stable 100 W of RF

output power. A part of the RF output power returns to ampli-

The signals are applied to the relay (FILTER unit; RL7181).

fiers to obtain a stable gain between 1.6 MHz and 27.5 MHz

The signals pass through the low-pass filter (FILTER unit;

bands by using feedback transformer (L6404). The output

L7183, L7184, C7183–C7188, C7193–C7196), and are then

RF signals are applied to the filter unit via the J6401 as

applied to the RL7182 which is controlled by the band con-

“FLIN” signal.

 

 

trol IC (MAIN unit; IC3602) as the “L12M” signal via the

 

 

 

 

buffer amplifier (MAIN unit; IC1301, pin 17).

The amplified signals are applied to the one of the 6 low-

 

 

 

 

 

 

 

pass filters which are composed of chebychev type.

 

 

• 15–29.9999 MHz signals

 

 

 

 

• 0.5–2.49999 MHz signals

 

 

The signals are applied to the relay (FILTER unit; RL7241).

The signals are applied to the relay (FILTER unit; RL7031).

The signals pass through the low-pass filter (FILTER unit;

The signals pass through the low-pass filter (FILTER unit;

L7245, L7246, C7243–C7245, C7247, C7248, C7253), and

L7036, L7037, C7033–C7036, C7038–C7040), and are then

are then applied to the RL7242 which is controlled by the

applied to the RL7032 which is controlled by the band con-

band control IC (MAIN unit; IC3602) as the “L22M” signal via

trol IC (MAIN unit; IC3602) as the “L1M” signal via the buffer

the buffer amplifier (MAIN unit; IC1301, pin 18).

amplifier (MAIN unit; IC1301, pin 13).

 

 

The filtered signal is applied to the antenna connector after

 

 

 

 

 

 

 

 

being passed through the RL7301 and J7211.

• RF FILTER CIRCUIT

 

 

 

 

 

 

 

Antenna

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

power

 

 

 

 

 

 

 

 

 

 

detector

 

 

Transmitter signals

LPF

 

 

Filter: L0

from the PA unit.

 

 

0.5 2.4999 MHz

 

 

 

 

 

 

LPF

 

 

Filter: L1

 

 

 

 

2.5 3.4999 MHz

 

 

 

 

 

 

 

 

LPF

 

 

Filter: L2

 

 

 

 

3.5 5.4999 MHz

 

 

 

 

 

 

 

 

LPF

 

 

Filter: L3

 

 

 

 

5.5 8.9999 MHz

 

 

 

 

 

 

 

 

LPF

 

 

Filter: L4

 

 

 

 

9—

14.9999 MHz

 

 

 

 

 

 

 

 

LPF

 

 

Filter: L5

 

 

 

 

15— 29.9999 MHz

 

 

 

 

 

 

 

 

 

 

 

 

low-pass filter control signals

 

 

 

 

 

 

 

 

 

 

from the MAIN unit

 

 

 

 

 

 

 

 

 

 

 

(L1M, L2M, L4M, L6M, L12M, L22M)

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Contents Service Manual OTH IntroductionOrdering Parts Repair Notes AUSTable of Contents Specifications SP-25 External Speaker ‘ General RC-26 Remote Controller ‘ GeneralUnit mm inch 37 1 15 RC-26 Section Inside ViewsIC-F7000 Bottom View IC-F7000 TOP View‘ in Case of Using External Reference Signal About External Reference Signal Input‘ Connection ‘ in Case of Using Internal Reference SignalCircuit Description Receiver CircuitsDSP Unit AF Amplifier Circuit DSP and Main Units DSP Receiver Circuit Main and DSP UnitsAGC Circuit DSP and Main Units DSP CircuitTransmitter Circuits RF Circuit MAIN, PA, PLL Units and DRI VER BoardRF Filter Circuit PLL Circuits Microphone Circuit Display Board Reset Circuit Display Board3 2ND LO and Reference Oscillator Circuits PLL Unit LCD Circuit Display and Connect BoardsPLL Unit Voltage Line Power Supply CircuitsPA Unit Voltage Line Display Board RC-26 Voltage LinePort Allocations Output Expander IC for the PLL Strobe Main Unit IC3601Output Expander IC for the PLL Unit Main Unit IC3602 Output Expander IC for Bandpass FIL- Ters Main Unit IC3604 Output Expander IC Main Unit IC36036 D/A Converter IC Main Unit IC3606 Front CPU Port Allocations RC-26, Display Board IC8201 Connection Adjustment ProceduresPreparation Required Test EquipmentOperating on the Adjustment Mode Entering the Adjustment ModeVoltage PLL Unit AdjustmentLPL Lock PLLPLL Unit TOP View PA and Filter Units Adjustment PLL Unit Bottom View PA Unit TOP ViewReceiver Adjustments L209 Presetting Main Unit TOP ViewRC-26 Front Panel Transmitter Adjustments VOL Dial IC-APCMain Unit Section Parts ListMain Board Resistor ERJ3GE JPW Resistor ERJ12YJ0R00U R3332 7030003640 ECEV1CA471P Tantalum ECST1AY335R ADM202EARN PLL UnitResistor ERA3YEB Mylar PA Unit DSP Unit DSP Board Driver Board VARISTOR-1 BoardVARISTOR-2 Board Display Board Front UnitRear Board Connect BoardHM-146 Main Unit MIC Unit Mechanical Parts and DisassemblyFront Parts Chassis PartsAccessries Accessories Front PartsConnect Board DR Driver Board Chassis PartsMIC Unit DS DSP BoardSEMI-CONDUCTOR Information Transistor and FET’SDiodes Rear Board TOP View Board LayoutsTOP View Connect Board TOP ViewBottom View Rear Board Bottom View MIC Unit Bottom View Connect BoardDisplay Board TOP View Bottom View Display Board DSP Board TOP View J9901 J9902 Bottom View DSP BoardJ2051 Bottom View Main Unit PA Unit Bottom View PA Unit PLL Unit Bottom View PLL Unit Driver Board TOP View VARISTOR-1 Board Bottom View Driver Board Voltage Line TX Line RX Line Common Line Section Block DiagramIC-F7000 Wiring Diagram12-1 RC-26 and HM-146 Voltage DiagramsMain Unit Explanatory notes Main PA Unit PLL Unit JPW-ERJ3GE DSP Board
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