1) Press EJ button and take out paneltake out A screw in top cover of the unit;Use tweezer to prize up top cover as the blue arrow direction which showed as below picture
A
EJ
2 Use electrical screw bit to take out B,C two screws in left and right side of metal bracket; Then take out D,E screws in panel base
B
3Uplift the CD deck mechanism and take out FFC then take out deck mechanism
C
D
E
The procedure of disassemblin钮 the panel:
1Use electrical screw bit to take out five screws in back panel and separate back panel and front panel; Take out the back panel and then take out
KB board.
a. To check whether it is connect well of the ISO connector (4 PIN power input ). Whether it is loose of the 15A fuse of the
ISO connector, or insert non in place.
b. To check whether there is any contamination and bad contact on the 22 Pin male/female connector on the panel and main
board.
c. To check the power supply of main board B+ACC should be +12V; The voltage of stabilivolt of ACC power supply circuit
ZD3 (6V8) should be 6V8.
2011-11-16
NO Power
1
NO audio
2
output
d.To check the voltage of the 17 pin of U1 MCU should be +4V8.
e. To check the voltage of the 16 pin (AVDD) of U1 MCU (T5CL8) should be +5V; The output voltage of U4 (LM2950) should
be +5V.
f. To check the oscillation frequence of crystal XT4 shuold be 7.2MHz .
g.To check the resistor network of NR1 (4K7).
H. To check the voltage of the15 pin(Lamp Vcc) of CN5 should be 6V4.
a. To check whether the volume knob is turn to the minimum position.
b. To check whether the unit is at MUTE mode, press SOURCE button and check whether it is effective of the input sound
source.
c. To check whether the connection of 8 PIN audio output wire of ISO connector is correct; wrong connection or short circuit
to the ground will caused the protection of the power amplifier( no voltage output).
d . To check the circuit of power amplifier U3 (LV47002) and VOLUME U5(TDA7419).
e. To check the normal voltage of 22 PIN(MUTE) of power amplifier U3(LV47002) , normally should be 4V.
f. To check the voltage of 20 pin of audio processor U5TDA7419, should be +9V0.
g. To check the voltage of control PIN SCLSDAthe 1819 pinof audio processor U5TDA7419, should be +5V2.
3
AM/FM
Radio
abnormal
a. To check the antenna of the AM/FM tuner.
b. To check whether the strength of then input signal of the tuner is too weak.
c. To check the voltage of the 5 pin7 pin9 pin of the tuner, should be +5V0
d. To check the voltage of the 12 pin(SDA) of the tuner, should be +4V5; the 13 pin(SCL) should be +4V5; the 15 pin(RA-
RES) should be +4V9.
e. To check the L output voltage of the 10 pin of tuner should be 1V8, the 11 pin R output voltage , should be 1V8.
21
NO.
failure
phenomena
failure causeremark
a. To check the antenna of the DAB tuner.
4
5
DAB Radio
CD defective
abnormal
b. To check whether the strength of then input signal of the tuner is too weak.
c. To check the supply voltage of the 1 pin of TUN1DAB-TUN should be +1V2the 2 pin should be +3V3.
a. To check whether the signal format of the disc is correspond to the request of the unit, whether there is any
contamination or damage or light leakage on the surface of the disc.
b. To check whether there is any abnormal of the rotation of the deck mecahnism, or whether the disc is enter in
position.
c. To check whether it is normal when reading USB?
d. To check whether the 17 P FFC of laser pick up is inserted in place, whether the socket of it is loose.
e. To check whether there is any contamination or foreign body on the surface of the laser pick up.
f. To check the servo board connector of CN20P1 and main board connector of CN9, whether the socket of it is loose.
j. To check the switch SW2 on the servo board.
h. To check the rotation mechanism of CD deck mechanism.
i. To check whether the rotation belt of deck mechanism is dislocation or loose.
6
USB/iPOD
defective
7AUX defective
a. To check whether the USB/iPOD signal format is correspond to the request of the unit.
b. To check the voltage of the the uppermost pin of the USB connector, should be +5V.
c. To check whether there is any wearing and scratch of the shrapnel and pin of the panel USB.
d. To check whether there is any contamination and bad contact on the male/female connector of the panel and main
board. If necessary, can exchange the panel to test whether the defective is occurred by the unit or panel.
a. To check the SOURCE shoule be in MP3-LINK mode.
b. To check the AUX IN input signal.
c. To check whether there is any contamination and bad contact on the male/female connector of the panel and main
board. If necessary, can exchange the panel to test whether the defective is occurred by the unit or panel.
22
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