2008 GEELY CK radio antenna

221Chapter 6 Audio SystemSection 1 Audio System DescriptionDescription:
1. Radio Wave Band
The radio wave bands used in radio broadcasting are as following:
LF: Low frequency
MF: Medium frequency
HF: High frequency
VHF: Very High frequency
2. Cover Area
There are great differences in the size of the
cover area for AM and FM monaural. Some-
times FM stereo broadcasts cannot be received
even though AM comes in very clearly. Not only
does FM stereo have the smallest cover area,
but it also picks up static and other types of in-
terference ("noise") easily.
3. Reception problems
Hint:
Besides the static noise fault, there are also the faults called "interference", "multipath transfer" and "fade
out". These faults are caused not by electrical noise but by the nature of the radio waves themselves.
(1) Interference
Besides static noise fault, AM broadcasts are
also susceptible to other types of noises, es-
pecially at night. This is because AM radio
waves are reflected by the Ionosphere at
night. These radio waves then interfere with
the signals from the same transmitter that
reach the vehicle's antenna directly. This type
of noise is called "interference".BandLF MF HF VHF
Ra dio wave AM FM
Modula tion Fre que nc y 30KHZ 300KHZ 3MHZ 30MHZ 300MHZ
Amplitude modula tion Fre que nc y modula tionFM (Stereo)FM (Monaural)InterferenceIonosphere

222(2) Multipath transfer
Noise caused by bouncing of radio waves off
obstructions is called "multipath transfer".
Multipath transfer occurs when a signal from
the broadcast transmitter antenna reflects off
buildings and mountains and interferes with
the signal that is received directly.
(3) Fade out
Because FM radio waves are of higher frequen-
cies than AM radio waves, they are reflected
off buildings, mountains, and other obstructions.
For this reason, FM signals often seem to gradu-
ally disappear or fade away as the vehicle goes
behind a building or other obstructions. This is
called "fade out".
4. Noise faults
For noise troubleshooting it is very important to understand the feedback information from the customers
well, so make the best use of the following questionnaire and diagnose the fault accurately.
HINT:
In the case that the noise occurrence condition does not meet any of the above, check based on the "Recep-Multipath
TransferFade outR a dio W a veO pe ra ting c ondition w he n
noise oc c ursCause
Noise occurs at a specific
place.Strong possibility of fore ign noise .
Noise occurs when listening
to fa int broa dc asting.There is a case that the same program is broadcasted from
each local station and that may be the case you are liste ning
to different station if the program is the same.
N oise occ urs only at night.Strong possibility of the inte rfe re nce from fa r dista nt
broa dca sting.
N o is e o c c u r s w h ile d r iv in g
and at a specific place.Strong possibility of multipath tra nsfer inte rfe re nc e a nd
caused by the changes of FM waves. AM
FM

2304. Unable to receive radio broadcast (poor reception)
(1) Check if the radio auto-research function works
Perform the radio auto-research function to see if it works
Normal:Check and replace radio assembly
Abnormal:Check the antenna for noise
(2) Check the antenna for noise
1Turn on radio to AM with the ignition switch ACC.
2Touch the antenna of the seated antenna assembly with the tip of the screwdriver. Check the speaker for
noise.
Standard: There is noise
Normal:Check and replace radio assembly
Abnormal:Check antenna assembly
(3) Check antenna assembly
1Remove the antenna plug from the antenna assembly
2Check for noise
yConnect the radio assembly connector and turn the ignition switch to ACC.
yTurn on the radio to AM
y Insert a flat pan screwdriver or metal object similar to thin wire into the hole in the antenna coaxial
cable. Check the speaker for noise.
Standard: There is noise.
Normal:Check and replace radio assembly
Abnormal:Check and replace antenna coaxial cable sub-assembly
5. Cassette tape can not be inserted or played.
(1) Check for foreign object
yCheck the radio assembly and cassette recorder for foreign object or defect.
Abnormal:Clean foreign object
Normal:Check cassette tape
(2) Check cassette tape
yCheck if the cassette tape is used to record music or sound.
Replace the tape with another tape and re-check if it is faulty.
(3) Replace it with another tape and re-check
yReplace the faulty tape with working tape to see if the same fault will re-occur.
Standard: The function is normal
Normal:The tape is faulty
Abnormal:Check if the radio auto-research function works

238Section 4 Audio and Video System ReplacementI. Notice on operationPlease explain to the customer that the AM/FM broadcast channel information will be cleared when remov-
ing the battery negative terminal cable. Record the channel information before removing the negative termi-
nal cable if necessary. Reset after connecting the negative terminal cable.
yAll cassette tapes and CDs must be taken out before radio removal and installation.
yIf the cassette tapes and CDs can not be taken out due to radio fault. Do not take them out by force.
Drive the vehicle to Service Station.
yMake sure the grounding bolts are tightened before antenna removal and installation.
yThere will be noise when receiving electric wave if the grounding bolts are not tightened.
yDon't touch the speaker cone.Intermediate Multiple CD main unit Radio assemblyInstrument PanelMultiple DVD main unit

240II. Radio assembly1. Remove the intermediate instrument panel (See interior trim)
2. Remove the radio assembly
1Remove 4 bolts
2Disconnect connectorIII. Front speaker assembly1. Remove front outside rear view mirror cover
2. Remove door handle
3. Remove the front door power window switch assembly
4. Remove the front door inside trim plate assembly
5. Remove the front door five-inch speaker assembly
1Disconnect connector
2Remove 4 self tapping screw and speaker assemblyIV. Tweeter speaker assembly1. Remove front outside rear view mirror cover
2. Remove tweeter speaker assembly
1 Disconnect connector
2Remove 2 self tapping screw and speaker assemblyV. Rear speaker assembly1. Remove rear speaker baffle
2. Remove rear speaker assembly
1 Disconnect connector
2Remove 4 self tapping screw and rear speaker assemblyVI. Remove antenna cable1. Remove the roof interior trim
2. Remove A-pillar trim plate
3. Disconnect connector
4. Remove instrument panel
5. Remove 4 clips and antenna cable