Icom IC-R8500 instruction manual Maintenance

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11 MAINTENANCE

■Disassembly

For internal maintenance and optional installations, disassemble the receiver.

CAUTION: DISCONNECT the DC power cable or AC adapter before performing any work on the receiver.

➀Remove 6 screws from the top of the receiver and 4 screws from its sides.

➁Carefully lift up the top cover while disconnecting the plug from the speaker cable.

➂Turn the receiver upside down.

➃Remove 6 screws from the bottom cover, then lift up the bottom cover.

Speaker cable

■Fuse replacement

If a fuse blows or the receiver stops functioning, try to find the source of the problem, and replace the dam- aged fuse with a new, rated fuse.

• For DC cable fuse

• For internal fuse

 

Fuse

MAIN unit

 

(FGMB 125 V 3 A)

■Level adjustments

R254

R252

R252 adjusts the beep level

R254 adjusts the UT-102 output level

■Memory backup

All of the CPU’s memory is backed up by an EEP- ROM (Electronically-Erasable Programmable Read- Only Memory). All data you set, such as memory con- tents, set mode contents, etc. is stored in this EEP- ROM. There is no internal lithium battery.

■CPU resetting

If the IC-R8500 is behaving erratically, this may be an indication of a CPU malfunction. In such cases, reset the CPU.

While pushing [MW], push [POWER] in to turn on the receiver power.

• The CPU is reset.

NOTE: Resetting the CPU clears all memory con- tents and returns internal settings to their factory defaults.

■Cleaning

If the receiver becomes dusty or dirty, wipe it clean with a dry, soft cloth.

AVOID the use of strong chemical solvents such as

thinner, benzine or alcohol to clean the

receiver. These may damage the receiver’s

surfaces.

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Contents IC-r8500 Accessories included with the IC-R8500 Qty Explicit DefinitionsTable of Contents ➋ SLEEP/SET Switch SLEEP/SET Panel DescriptionFront panel ➎ Headphone Jack Phones7MAIN Dial 5SPEECH/LOCK Switch SPCH/LOCK@0S-METER @7SCAN Switches Scan Scan SET Skip p Auto pPrio p DLY D/S pRear panel 7ATTENUATOR Indicators 9RECEIVE IndicatorFunction display MHz kHzMounting installation ConnectionsLocation Receiver standRequired connections Using a long wire antenna for HF bands TYPE-N Connector Installation ExamplePL-259 Connector Installation Example Antenna connection GroundingConnecting to a PC Tape recorder connectionsTransceive function Data demodulation terminalFrequency Setting Using the keypadExample Setting the Frequency Using the Keypad Read me firstUsing the main dial Selecting a tuning stepSetting the programmable tuning step Setting the lock function coverageMode selection Initial settingsReceive Functions Center indicator Squelch functionFunctions for FM Functions for SSB/CWBFO adjustment Noise blankerAudio peak filter Dagc functionFor high speed data 9600 bps reception in FM mode Data communicationsConnections Receiving methodBank Initial Contents Usage Memory ChannelsGeneral Bank selectionUsing the M-CH selector Using the keypadChannel selection Bank limit functionCopy and paste memory editing ProgrammingClearing Channel name programming Channel/bank namesBank name programming Deleting memory channels Assigning channel numbersTo rearrange bank channel assignments ➂ Rotate M-CH to select the following Adding/inserting memory channels➃ Push Bank for 1 sec. to perform the selected operation Scans OperationMemory scan Memory select scanDProgrammed scan Mode select function Specifying skip channel and frequencyPriority scan Specifying skip channelsVoice scan control function Automatic bank limit/skip functionsTurning OFF the automatic function Scan speed/delay functions Programming scan edge frequenciesScan resume condition OFF DLY ∞Scan delay Assigning a function to the DELAY/SPEED controlScan speed Sleep Timer OperationSET Mode Selecting quick set modeSelecting initial set mode Display Example Quick SET ModeQuick set mode items Initial set mode items When the optional UT-102 Voice Synthesizer Unit is Installed, you can select between EnglishInstalled, you can select between faster or slower This item sets the data transfer rate. When AutoConnector Information RS-232C socket Remote jackIf OUT jack AGC OUT jackDC 13.8 V and DC in sockets REC Remote jackREC OUT jack Phones jackControl Commands Command tableData format Basic format from PC to IC-R8500Memory channel contents set & write 1A ‘OK’ message from IC-R8500 to PC‘NG’ message from IC-R8500 to PC Special bank number and channels bnMaintenance Optional Installations ➂Replace the top coverCR-293HIGH Stability Crystal Unit Operation TV-R7100 specificationsGeneral TV receiverTroubleshooting Memory Channels Scan Problem Possible Cause Solution General SpecificationsReceiver Options AH-7000FL-52ACW Narrow Filter 455 kHz 500Hz/-6 dB AD-55/A/V AC AdapterCount on us

IC-R8500 specifications

The Icom IC-R8500 is a highly regarded general-purpose receiver that has made its mark among amateur radio enthusiasts and professionals alike. This versatile communication receiver is known for its wide frequency coverage, advanced features, and robust design, making it a valuable tool for various applications, including shortwave listening, public safety communication, and aircraft monitoring.

One of the standout features of the IC-R8500 is its extensive frequency coverage. It spans a range from 0.1 MHz to 3 GHz, allowing users to access a wide spectrum of signals. The receiver includes coverage of HF, VHF, UHF, and even microwave bands, making it suitable for listening to everything from amateur radio transmissions to satellite communications.

The receiver employs a high-performance double-conversion superheterodyne architecture, which contributes to its excellent sensitivity and selectivity. The advanced RF circuitry minimizes interference and enhances the clarity of received signals. Users can expect outstanding audio quality and a wide dynamic range, even in challenging reception conditions.

Digital Signal Processing (DSP) is another key technology incorporated into the IC-R8500. The DSP capabilities allow users to apply noise reduction and filtering techniques to improve the quality of the received audio. Features such as automatic notch filtering and IF filtering help eliminate unwanted noise, enhancing the listening experience.

The IC-R8500 is equipped with a large, easy-to-read LCD display that provides information on frequency, mode, signal strength, and other essential parameters. The user-friendly interface simplifies operation, allowing quick access to various settings and functions. Additionally, the receiver supports various modulation modes, including AM, FM, SSB, and CW, catering to different listening preferences.

For those seeking enhanced connectivity, the IC-R8500 offers multiple options, including an audio output jack, and external speaker connections. It also has a built-in memory function, allowing users to store and recall favorite frequencies easily. The receiver can be controlled via a computer interface, offering versatility for advanced users and programmers.

In summary, the Icom IC-R8500 stands out for its wide frequency range, superior sensitivity, and advanced features powered by DSP technology. Its robust construction and user-friendly design make it a favorite among communications enthusiasts seeking a reliable and versatile receiver for various applications. Whether for hobbyist listening or professional use, the IC-R8500 remains a top choice in the world of radio receivers.
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