Philips CED1900/51, Руководство по обслуживанию

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