13 TROUBLESHOOTING

The following chart is designed to help you correct problems which are not equipment malfunctions. If you are unable to locate the cause of a problem or

solve it through the use of this chart, contact your nearest Icom Dealer or Service Center.

POWER

RECEIVE FUNCTIONS

FRONT PANEL CONTROL

PROBLEM

POSSIBLE CAUSE

SOLUTION

REF.

Power does not turn

• DC power cable is improperly con-

• Reconnect the DC power cable se-

p. 8

ON when [POWER] is

nected.

curely.

 

 

pushed in.

• A fuse is blown.

• Check for the cause, then replace the

p. 37

 

 

fuse with a spare one.

 

 

• During AC adapter operation, the

• Connect the jumper connector to the

p. 8

 

jumper connector is not in use.

[DC13.8V] jack on the receiver’s rear panel.

 

 

• External 12 V DC is connected to the

• Connect the external power source to

p. 8

 

[DC IN] jack.

the [DC13.8V] jack. The [DC IN] jack ac-

 

 

 

cepts an AC adapter (AD-55/A/V) only.

 

 

 

 

 

Receiver turns OFF by

• The sleep timer has been activated.

• Turn power back ON, then push

p. 29

itself.

 

[SLEEP] one or more times to turn the

 

 

 

sleep timer function OFF, if desired.

 

 

 

 

 

No sound comes from

• Volume level is too low.

• Rotate [AF GAIN] clockwise to obtain a

—

the speaker.

 

suitable listening level.

 

 

• The squelch is closed.

• Rotate [SQUELCH] counterclockwise to

p. 14

 

 

open the squelch.

 

 

 

• An external speaker or headphones are

• Disconnect the

external speaker or

—

 

connected.

headphones.

 

 

 

• CW narrow mode is selected when no

• Select another mode or install the op-

pgs.

 

optional filter is installed.

tional CW narrow filter.

13, 38

 

 

 

 

Sensitivity is low.

• The coaxial cable is cut.

• Fix the coaxial cable.

—

 

• No antenna is connected.

• Connect an antenna.

p. 8

 

• The connected antenna is not matched

• Connect an antenna matched to the re-

p. 8

 

to the receive frequency.

ceiving frequency.

 

 

• Wrong antenna connector is used for

• Check the antenna connection.

p. 8

 

V/UHF and HF antenna.

 

 

 

 

• Wrong antenna connector is selected in

• Select the proper antenna connector:

p. 31

 

set mode for HF antenna.

SO-239 or phono (RCA).

 

 

• An RF attenuator is activated.

• Push [ATT 10 dB] or [ATT 20 dB] to can-

—

 

 

cel the function.

 

 

 

 

 

 

Receive signal is un-

• [IF SHIFT] is rotated too far CCW or

• Set [IF SHIFT] to the center position.

p. 14

clear or distorted.

CW.

 

 

 

 

• [APF] is rotated too far CCW or CW.

• Set the [APF] control to the center position

p. 15

 

 

or push the [APF] switch to turn it OFF.

 

 

• The wrong mode switch is pushed.

• Push the correct mode switch.

p. 13

 

 

 

 

WFM mode cannot be

• The operating frequency is lower than

• Set the frequency above 30 MHz when

p. 13

set.

30 MHz. (WFM mode cannot be se-

in WFM mode.

 

 

 

lected below 30 MHz.)

 

 

 

Main dial does not func-

• The lock function is activated.

• Push [LOCK] for 1 sec. to deactivate.

p. 12

tion.

 

 

 

 

 

 

 

 

 

[LOCK] does not lock

• DIAL LOCK is selected in quick set

• Select PANEL

LOCK in quick set

p. 31

the keypad, function

mode.

mode.

 

 

switches, etc.

 

 

 

 

 

 

 

 

The selected frequency

• The memory channel was changed be-

• Push [MW] for 1 sec. to write into a

p. 19

is erased.

fore writing into memory.

memory before changing channels.

 

 

 

 

 

The frequency is not

• An optional UT-102 VOICE SYNTHESIZER

• Install the UT-102.

p. 38

announced when push-

UNIT is not installed.

 

 

 

ing [SPCH].

 

 

 

 

 

 

 

 

 

41

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Image 44
Icom IC-R8500 instruction manual Troubleshooting
Page 43 Page 45

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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