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Product Model
CED1900
failure
NO.
phenomena
a To check whether the CN2(ISO) connector of the tail of the unit is connect well . Whether it is loose of the 15A fuse of the CN2(ISO)
connector, or insert non in place.
b To check the 45 Pin connectors of the CN1 and CN5 whether the socket of it is loose.
c To check the output voltage of U15 (LM2950) should be +5V0.To check the voltage of U2(MCU) 7Pin 8pin 18pin 19pin 40pin
1
NO Power
should be +5V0.
d To check the 17 pin voltage of the U2(MCU) should be +4V5. To check the 28 pin
e To check the voltage of the 1~3pin of the CN5 connector should be +5V0.
f
To check the oscillation frequence of crystal X1 shuold be 16MHz .
a To check the 45 Pin connectors of the CN1 and CN5 whether the socket of it is loose.
b To check the 32 pin voltage of the CN5 connector should be +5V0.
c To check the 41~45 pin voltage of the CN5 connector should be +12V0.
6.2"TFT
2
abnormal
d To check the voltage of the L2 of the TFT board,should be +5V0.
e To check the D14 voltage of the cathode ,should be +10V0.
f To check the connector of the CN10 whether the socket of it is loose.
a To check whether the volume up/down key is adjust to the minimum position.
b
To check whether the unit is at MUTE mode. To check whether it is effective of the input sound source.
c To check whether the unit in to REAR ZONE function.
d To check whether the connection of 8 PIN audio output wire of ISO connector is correct; wrong connection or short circuit to the
NO audio
3
ground will caused the protection of the power amplifier( no voltage output).
output
e To check the circuit of power amplifier U12(LV47002 IC) and VOLUME U7(7419 IC).
f
To check the voltage of 22 PIN(MUTE) of power amplifier U12(47002 IC) , normally should be +4V0.
g To check the voltage of 22 pin 23 pin of U7 volume IC, normally should be +5V0.
a
To check the antenna of the AM/FM tuner.
51/55/98
Tate
failure cause
29 pin voltage of the U2(MCU) should be +5V0.
22
2012-3-27
remark
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