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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Icom IC-R8500 instruction manual Maintenance
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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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