2008 GEELY MK Workshop Manual

Wave band LF MF HF VHF
Radio wave AM FM
Modulation Amplitude modulation Frequency modulationFrequency 30KHZ 300KHZ 3MHZ 30MHZ 300MHZ
2. Area coverage
Scope of AM and FM broadcasting coverage area differs greatly.
Sometimes although AM broadcast may be received clearly, FM
binaural broadcasting cannot be received. Not only listening zone of
FM binaural broadcasting is small, but also static noise or other
cacophony (noise) tends to occur.
3. Receiving problem
Notes:
Besides static noise problem, there is also interference, multiplex
and attenuation. These problems are not caused by electric cacophony,
but the problem of radio wave itself.
(1) Interference
Besides static noise problem, AM broadcast tends to receive
other types of noise, especially at night. This is because ionosphere
reflects AM radio wave at night, these interference electric waves
interfere with signals from the same signal source while entering into
vehicle antenna directly, this kind of noise is called "interference".
(2) Multiplex
Noise caused by radio wave reflected from barrier is called
"multiplex". When radio signal emitted by broadcast antenna is
reflected by high buildings or high mountains, and disturbs directly
received other signals, multiplex phenomenon occurs.
(3) Attenuation
Since its frequency is higher than AM, FM wave is more easily
reflected by high buildings or high mountains. Therefore, FM signal
often disappears gradually, or when vehicle is blocked by barrier, it
cannot receive any signal, such phenomenon is called "attenuation".Audio System -Audio System Description5-38Chapter 5 Audio SystemSection 1 Audio System DescriptionDescription:
1. Radio wave band
Wave bands used in radiobroadcast are as follows:
LF: low frequency MF: medium frequency HF: high frequency VHF: very high frequencyFM (stereo)
FM (non-stereo)
AMInterference
IonosphereMultiplexAttenuation

Notes:
If noise occurred does not belong to any of the above-mentioned situations, please find out the cause according
to "receiving problem".
5. CD phonograph
CD phonograph (hereafter referred to as CD) uses laser beam to read digital signals recorded on CD, then revert
to analog signal of music.
Notes:
Don't attempt to break down or apply oil to any component of the phonograph. Do not insert anything other
than a CD into optical disk cartridge.
Notes:
CD phonograph uses invisible laser beam, could generate harmful radialization, always operate phonograph
according to instructions.
6. Maintenance
(1) Cleaning of magnetic tape phonograph, magnetic head:
a. Open tape cartridge gate with your finger, use a pencil or a similar article to insert guider.
b. use cleaning pen or cotton swabs with detergent to wipe magnetic head surface, idler wheel or guide
pulley.
(2) CD phonograph, CD cleaning:
If CD is dirty, use soft cloth to wipe the surface from CD center radially outwards.
Notes:
Don't use ordinary recorder detergent or antistatic protectant. 4. Noise problem
Detailed description of noise problem fed back by customers is of great importance for analyzing and
eliminating noise interference, the table below may be used for diagnosis.Audio System -Audio System Description5-39Noise condition
Noise occurs in special position
Noise occurs when receiving small
signal
Noise only occurs at night
Noise occurs in special position
during driving Radio wave
AM
FMCause
Most probably external noise
Broadcast from local station might broadcast the same
program. If program is the same, one of them might be
disturbed
Most probably from remote interference
Most probably is multiplex interference due to FM
frequency changeExample:
Magnetic head
Guide pulley
Idler wheel

Section 2 Audio System Connector Terminal Layout2. Connect terminal definitionAudio System -Audio System Connector Terminal Layout5-401. Connector terminal layout on wire harnessCondition
The audio system is on
The audio system is on
Ignition switch turned to ACC
Constant Status
The audio system is on
The audio system is on
Normal Status
Position lamp switch turned to ON
The audio system is on
The audio system is on
The audio system is on
The audio system is on
Normal Status
Audio system is On
Normal Status
Ignition switch ACC
The audio system is on
The audio system is on
Normal Status Function
FR+
FL+
ACC
B+
FR-
FL-
GND
Null
Mute
TAIL
RR+
RL+
RR-
Null
Null
RL-
B+
BUS
GND
ACC
Null
R-OUT
L-OUTGND(Audio Frequency)Terminal No.
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
B1
B2
B3
B4
B5
B6
C1
C2
C3
C4
C5
C6
C7
C8Wire color
Lg
WB
RY
R
LgR
W
B
V
G W
PB
YR
P
Y WStandard Voltage
Wave form is synchronized with the output sound
Wave form is synchronized with the output sound
10~14V
10~14V
Wave form is synchronized with the output sound
Wave form is synchronized with the output sound
ON
10~14V
Wave form is synchronized with the output sound
Wave form is synchronized with the output sound
Wave form is synchronized with the output sound
Wave form is synchronized with the output sound
10~14V
Pulse Signal
ON
10~14VWave form is synchronized with the output sound
Wave form is synchronized with the output soundON

Suspected Area
1. Radio assembly circuit faulty
2. Radio assembly
1. Radio assembly backlight terminal
2. Radio assembly
1. Speaker circuit
2. Radio assembly power circuit faulty
3. Radio assembly
1. Speaker circuit
2. Radio assembly power circuit faulty
3. Radio assembly
1. Antenna circuit
2. Radio assembly
1. Tape
2. Radio assembly power circuit faulty
3. Radio assembly
1. Tape
2. Radio assembly
1. Tape
2. Radio assembly
1. Tape
2. Radio assembly
1. Wire between CD box and main unit
2. CD Player main unit power supply circuit fault
3. CD box
4. CD Player main unit
1. Wire between CD box and main unit
2. CD box
3. CD bag
4. CD Player main unitSection 3 Audio System InspectionI. Symptom analysisSymptom
The system doesn't work when power is ON.
The radio backlight does not light up with the
illumination switch ON
Speaker soundless in all modes
Poor sound quality in all modes (Volume faint)
Unable to receive radio broadcast (poor
reception)
The cassette could not be inserted or played
Cassette tape will not be ejected
Poor sound quality only when playing cassette
tape
Tape jammed, malfunction with tape speed or
auto-reverse
CD could not be inserted or ejected after in-
serted
CD player doesn't work even if power is onAudio System -Audio System Inspection5-41

Suspected Area
1. Wire between CD box and main unit
2. CD box
3. CD bag
4. CD PLAYER main unit
1. Wire between CD box and main unit
2. CD box
1. CD box
2. CD box installation Symptom
CD can not be taken out
Sound quality poor only when playing CD
(Volume faint)
CD sound jumpTester connection Condition Standard state
GND and vehicle earth Normal status ON
Tester connection Condition Standard state
+B and GND Normal status 10-14V
ACC and GND Ignition switch is in ACC or ON 10-14VII. Trouble shooting1. Power switch system does
not work
Circuit diagram
Abnormal, repair or replace wiring harness, connector
Normal, check and replace radio assembly (1) Check radio assembly (+ B, ACC, GND)
a. As shown in the table below, check connection between terminals in each operating condition.
Standard:
b. As shown in the table below, check voltage between terminals in each operating condition.
Standard:Fuse Box in Engine
CompantmentAudio System -Audio System Inspection5-42MAIN
60AFuse Box under
Instrument Panel

Tester connection Condition Standard state
TAIL and GND Combination switch (light switch) 10-14V2. Turn on light switch, radio backlight
does not illuminate
Circuit diagram
(1) Check radio assembly (TAIL)
As shown in the table below, check voltage between terminals in each operating condition.
Standard:
Abnormal, repair or replace wiring harness, connector
Normal, check and replace radio assembly
3. Loudspeakers is silent in all modes
Circuit diagramAudio System -Audio System Inspection5-43 lamp switch
Please Refer to "MK WIRING DIAGRAM"

(1) Check LCD Illumination
a. Turn the ignition switch to ACC
b. Turn on radio assembly
c. Turn on the position light
Standard: The LCD indicator of the radio assembly goes on
Abnormal: go to step (7)
Normal: go to the next step
(2) Control volume and adjust the volume balance
Adjust the volume and its balance of the radio assembly to find out the inaudible speaker.
If all speakers are mute, check and replace the radio assembly
If individual speaker is mute, then respectively check and replace the inaudible speaker.
(3) Tweeter assembly inspection
a. Disconnect the speaker connector
b. Check the resistance
Notice:
Do not remove the speaker during inspection.
Standard Value: 4 ohm
Abnormal: Replace tweeter speaker assembly
Normal: Check wire harness and connector
(4) Check front speaker assembly
a. Disconnect speaker connector
b. Check resistance
Standard Value: 4 ohm
Abnormal: Replace front speaker assembly
Normal: Check wire harness and connector
(5) Check rear speaker assembly
a. Disconnect speaker connector
b. Check resistance
Standard Value: 4 ohm
Abnormal: Replace rear speaker assembly
Normal: Check wire harness and connector
(6) Check wire harness and connector
Abnormal Repair or replace wire harness and connector
Normal Check and replace radio assembly
(7) Check and replace radio assembly (+B, ACC, GND)
a. Check the continuity between terminals under each operating condition as shown in the table below.
Standard:Audio System -Audio System Inspection5-44Tester connection Condition Standard Status
GND Normal ON

Tester Connection Condition Standard Status
+B - GND Normal 10~14V
ACC - GND Ignition switch ACC or ON 10~14V
Abnormal: Repair or replace wire harness and connector
Normal: Check and replace radio assembly
4. 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
a. Turn on radio to AM with the ignition switch ACC.
b. Touch 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
a. Remove the antenna plug from the antenna assembly
b. Check for noise

Connect the radio assembly connector and turn the ignition switch to ACC.

Turn on the radio to AM

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

Check the radio assembly and cassette recorder for foreign object or defect.
Abnormal: Clean foreign object
Normal: Check cassette tape
(2) Check cassette tape

Check if the cassette tape is used to record music or sound.
Replace the tape with another tape and re-check if it is faulty. b. Check the voltage between terminals under each operating condition as shown in the table below.
Standard:Audio System -Audio System Inspection5-45